#!/usr/bin/env python3

from pyUIClass.window1 import Ui_MainWindow

import PyQt5.QtWidgets as Qw
import PyQt5.QtGui as Qg
import PyQt5.QtCore as Qc
import xasyVersion

import numpy as np
import os
import json
import io
import pathlib
import webbrowser
import subprocess
import tempfile
import datetime
import string
import atexit

import xasyUtils as xu
import xasy2asy as x2a
import xasyFile as xf
import xasyOptions as xo
import UndoRedoStack as Urs
import xasyArgs as xa
import xasyBezierInterface as xbi
from xasyTransform import xasyTransform as xT
import xasyStrings as xs

import PrimitiveShape
import InplaceAddObj

import CustMatTransform
import SetCustomAnchor
import GuidesManager


class ActionChanges:
    pass


# State Invariance: When ActionChanges is at the top, all state of the program & file
# is exactly like what it was the event right after that ActionChanges was created.

class TransformationChanges(ActionChanges):
    def __init__(self, objIndex, transformation, isLocal=False):
        self.objIndex = objIndex
        self.transformation = transformation
        self.isLocal = isLocal


class ObjCreationChanges(ActionChanges):
    def __init__(self, obj):
        self.object = obj

class HardDeletionChanges(ActionChanges):
    def __init__(self, obj, pos):
        self.item = obj
        self.objIndex = pos

class AnchorMode:
    center = 0
    origin = 1
    topLeft = 2
    topRight = 3
    bottomRight = 4
    bottomLeft = 5
    customAnchor = 6
    

class GridMode:
    cartesian = 0
    polar = 1


class SelectionMode:
    select = 0
    pan = 1
    translate = 2
    rotate = 3
    scale = 4
    delete = 5
    setAnchor = 6
    selectEdit = 7

class AddObjectMode:
    Circle = 0
    Arc = 1
    Polygon = 2

class MainWindow1(Qw.QMainWindow):
    defaultFrameStyle = """
    QFrame{{ 
        padding: 4.0;
        border-radius: 3.0; 
        background: rgb({0}, {1}, {2})
    }}
    """

    def __init__(self):
        super().__init__()
        self.ui = Ui_MainWindow()
        global devicePixelRatio
        devicePixelRatio=self.devicePixelRatio()
        self.ui.setupUi(self)
        self.ui.menubar.setNativeMenuBar(False)

        self.settings = xo.BasicConfigs.defaultOpt
        self.keyMaps = xo.BasicConfigs.keymaps

        self.raw_args = Qc.QCoreApplication.arguments()
        self.args = xa.parseArgs(self.raw_args)

        self.strings = xs.xasyString(self.args.language)
        self.asy2psmap = x2a.identity()

        if self.settings['asyBaseLocation'] is not None:
            os.environ['ASYMPTOTE_DIR'] = self.settings['asyBaseLocation']

        if self.args.asypath is not None:
            asyPath = self.args.asypath
        else:
            asyPath = self.settings['asyPath']

        self.asyPath = asyPath
        self.asyEngine = x2a.AsymptoteEngine(self.asyPath)

        try:
            self.asyEngine.start()
        finally:
            atexit.register(self.asyEngine.cleanup)

        # For initialization purposes
        self.canvSize = Qc.QSize()
        self.filename = None
        self.currDir = None
        self.mainCanvas = None
        self.dpi = 300
        self.canvasPixmap = None
        self.tx=0
        self.ty=0

        # Actions
        # <editor-fold> Connecting Actions
        self.ui.txtLineWidth.setValidator(Qg.QDoubleValidator())

        self.connectActions()
        self.connectButtons()

        self.ui.txtLineWidth.returnPressed.connect(self.btnTerminalCommandOnClick)
        # </editor-fold>

        # Base Transformations

        self.mainTransformation = Qg.QTransform()
        self.mainTransformation.scale(1, 1)
        self.localTransform = Qg.QTransform()
        self.screenTransformation = Qg.QTransform()
        self.panTranslation = Qg.QTransform()

        # Internal Settings
        self.magnification = self.args.mag
        self.inMidTransformation = False
        self.addMode = None
        self.currentlySelectedObj = {'key': None, 'allSameKey': set(), 'selectedIndex': None, 'keyIndex': None}
        self.pendingSelectedObjList = [] 
        self.pendingSelectedObjIndex = -1
        
        self.savedMousePosition = None
        self.currentBoundingBox = None
        self.selectionDelta = None
        self.newTransform = None
        self.origBboxTransform = None
        self.deltaAngle = 0
        self.scaleFactor = 1
        self.panOffset = [0, 0]

        super().setMouseTracking(True)
        # setMouseTracking(True)
        
        self.undoRedoStack = Urs.actionStack()

        self.lockX = False
        self.lockY = False
        self.anchorMode = AnchorMode.center
        self.currentAnchor = Qc.QPointF(0, 0)
        self.customAnchor = None
        self.useGlobalCoords = True
        self.drawAxes = True
        self.drawGrid = False
        self.gridSnap = False  # TODO: for now. turn it on later

        self.fileChanged = False

        self.terminalPythonMode = self.ui.btnTogglePython.isChecked()

        self.savedWindowMousePos = None

        self.finalPixmap = None
        self.postCanvasPixmap = None
        self.previewCurve = None
        self.mouseDown = False

        self.globalObjectCounter = 0

        self.fileItems = []
        self.drawObjects = []
        self.xasyDrawObj = {'drawDict': self.drawObjects}

        self.modeButtons = {
            self.ui.btnTranslate, self.ui.btnRotate, self.ui.btnScale, # self.ui.btnSelect,
            self.ui.btnPan, self.ui.btnDeleteMode, self.ui.btnAnchor, 
            self.ui.btnSelectEdit
                            }

        self.objButtons = {self.ui.btnCustTransform, self.ui.actionTransform, self.ui.btnSendForwards,
                           self.ui.btnSendBackwards, self.ui.btnToggleVisible
                           }

        self.globalTransformOnlyButtons = (self.ui.comboAnchor, self.ui.btnAnchor)

        self.ui.txtTerminalPrompt.setFont(Qg.QFont(self.settings['terminalFont']))

        self.currAddOptionsWgt = None
        self.currAddOptions = {
            'options': self.settings, 
            'inscribed': True,
            'sides': 3,
            'centermode': True,
            'fontSize': None, 
            'asyengine': self.asyEngine,
            'fill': self.ui.btnFill.isChecked(),
            'closedPath': False,
            'useBezier': True, 
            'magnification': self.magnification,
            'editBezierlockMode': xbi.Web.LockMode.angleLock, 
            'autoRecompute': False
        }


        self.currentModeStack = [SelectionMode.translate]
        self.drawGridMode = GridMode.cartesian
        self.setAllInSetEnabled(self.objButtons, False)
        self._currentPen = x2a.asyPen()
        self.currentGuides = []
        self.selectAsGroup = self.settings['groupObjDefault']

        # commands switchboard
        self.commandsFunc = {
            'quit': Qc.QCoreApplication.quit,
            'undo': self.btnUndoOnClick,
            'redo': self.btnRedoOnClick,
            'manual': self.actionManual,
            'about': self.actionAbout,
            'loadFile': self.btnLoadFileonClick,
            'save': self.actionSave,
            'saveAs': self.actionSaveAs,
            'transform': self.btnCustTransformOnClick,
            'commandPalette': self.enterCustomCommand,
            'clearGuide': self.clearGuides,
            'finalizeAddObj': self.finalizeAddObj,
            'finalizeCurve': self.finalizeCurve, 
            'finalizeCurveClosed': self.finalizeCurveClosed, 
            'setMag': self.setMagPrompt,
            'deleteObject': self.btnSelectiveDeleteOnClick, 
            'anchorMode': self.switchToAnchorMode,
            'moveUp': lambda: self.translate(0, -1),
            'moveDown': lambda: self.translate(0, 1),
            'moveLeft': lambda: self.translate(-1, 0),
            'moveRight': lambda: self.translate(1, 0),

            'scrollLeft': lambda: self.arrowButtons(-1, 0, True),
            'scrollRight': lambda: self.arrowButtons(1, 0, True),
            'scrollUp': lambda: self.arrowButtons(0, 1, True),
            'scrollDown': lambda: self.arrowButtons(0, -1, True), 

            'zoomIn': lambda: self.arrowButtons(0, 1, False, True), 
            'zoomOut': lambda: self.arrowButtons(0, -1, False, True)
        }

        self.hiddenKeys = set()

        # Coordinates Label

        self.coordLabel = Qw.QLabel(self.ui.statusbar)
        self.ui.statusbar.addPermanentWidget(self.coordLabel)

        # Settings Initialization
        # from xasyoptions config file
        self.loadKeyMaps()
        self.setupXasyOptions()

        self.colorDialog = Qw.QColorDialog(x2a.asyPen.convertToQColor(self._currentPen.color), self)
        self.initPenInterface()

    def arrowButtons(self, x:int , y:int, shift: bool=False, ctrl: bool=False):
        "x, y indicates update button orientation on the cartesian plane."
        if not (shift or ctrl):
            self.changeSelection(y)
        elif not (shift and ctrl):
            self.mouseWheel(30*x, 30*y)
        self.quickUpdate()

    def translate(self, x:int , y:int):
        "x, y indicates update button orientation on the cartesian plane."
        if self.lockX:
            x = 0
        if self.lockY:
            y = 0
        self.tx += x
        self.ty += y
        self.newTransform=Qg.QTransform.fromTranslate(self.tx,self.ty)
        self.quickUpdate()

    def cleanup(self):
        self.asyengine.cleanup()

    def getScrsTransform(self):
        # pipeline:
        # assuming origin <==> top left
        # (Pan) * (Translate) * (Flip the images) * (Zoom) * (Obj transform) * (Base Information) 

        # pipeline --> let x, y be the postscript point
        # p = (mx + cx + panoffset, -ny + cy + panoffset)
        factor=0.5/devicePixelRatio;
        cx, cy = self.canvSize.width()*factor, self.canvSize.height()*factor

        newTransf = Qg.QTransform()
        newTransf.translate(*self.panOffset)
        newTransf.translate(cx, cy)
        newTransf.scale(1, 1)
        newTransf.scale(self.magnification, self.magnification)

        return newTransf

    def finalizeCurve(self):
        if self.addMode is not None:
            if self.addMode.active and isinstance(self.addMode, InplaceAddObj.AddBezierShape):
                self.addMode.forceFinalize()
                self.fileChanged = True

    def finalizeCurveClosed(self):
        if self.addMode is not None:
            if self.addMode.active and isinstance(self.addMode, InplaceAddObj.AddBezierShape):
                self.addMode.finalizeClosure()
                self.fileChanged = True

    def getAllBoundingBox(self) -> Qc.QRectF:
        newRect = Qc.QRectF()
        for majitem in self.drawObjects:
            for minitem in majitem:
                newRect = newRect.united(minitem.boundingBox)
        return newRect

    def finalizeAddObj(self):
        if self.addMode is not None:
            if self.addMode.active:
                self.addMode.forceFinalize()
                self.fileChanged = True

    def openAndReloadSettings(self):
        settingsFile = self.settings.settingsFileLocation()
        subprocess.run(args=self.getExternalEditor(asypath=settingsFile))
        self.settings.load()
        self.quickUpdate()

    def setMagPrompt(self):
        commandText, result = Qw.QInputDialog.getText(self, '', 'Enter magnification:')
        if result:
            self.magnification = float(commandText)
            self.currAddOptions['magnification'] = self.magnification
            self.quickUpdate()

    def btnTogglePythonOnClick(self, checked):
        self.terminalPythonMode = checked

    def internationalize(self):
        self.ui.btnRotate.setToolTip(self.strings.rotate)

    def handleArguments(self):
        if self.args.filename is not None:
            self.loadFile(self.args.filename)
        else:
            self.initializeEmptyFile()

        if self.args.language != 'en':
            self.internationalize()

    def initPenInterface(self):
        self.ui.txtLineWidth.setText(str(self._currentPen.width))
        self.updateFrameDispColor()

    def updateFrameDispColor(self):
        r, g, b = [int(x * 255) for x in self._currentPen.color]
        self.ui.frameCurrColor.setStyleSheet(MainWindow1.defaultFrameStyle.format(r, g, b))

    def initDebug(self):
        debugFunc = {
        }
        self.commandsFunc = {**self.commandsFunc, **debugFunc}

    def dbgRecomputeCtrl(self):
        if isinstance(self.addMode, xbi.InteractiveBezierEditor):
            self.addMode.recalculateCtrls()
            self.quickUpdate()

    def objectUpdated(self):
        self.removeAddMode()
        self.clearSelection()
        self.asyfyCanvas()

    def connectActions(self):
        self.ui.actionQuit.triggered.connect(lambda: self.execCustomCommand('quit'))
        self.ui.actionUndo.triggered.connect(lambda: self.execCustomCommand('undo'))
        self.ui.actionRedo.triggered.connect(lambda: self.execCustomCommand('redo'))
        self.ui.actionTransform.triggered.connect(lambda: self.execCustomCommand('transform'))

        self.ui.actionOpen.triggered.connect(self.actionOpen)
        self.ui.actionSave.triggered.connect(self.actionSave)
        self.ui.actionSaveAs.triggered.connect(self.actionSaveAs)
        self.ui.actionManual.triggered.connect(self.actionManual)
        self.ui.actionAbout.triggered.connect(self.actionAbout)
        self.ui.actionSettings.triggered.connect(self.openAndReloadSettings)
        self.ui.actionEnterCommand.triggered.connect(self.enterCustomCommand)
        self.ui.actionExportAsymptote.triggered.connect(self.btnExportAsyOnClick)

    def setupXasyOptions(self):
        if self.settings['debugMode']:
            self.initDebug()
        newColor = Qg.QColor(self.settings['defaultPenColor'])
        newWidth = self.settings['defaultPenWidth']

        self._currentPen.setColorFromQColor(newColor)
        self._currentPen.setWidth(newWidth)

    def connectButtons(self):
        # Button initialization
        self.ui.btnUndo.clicked.connect(self.btnUndoOnClick)
        self.ui.btnRedo.clicked.connect(self.btnRedoOnClick)
        self.ui.btnLoadFile.clicked.connect(self.btnLoadFileonClick)
        self.ui.btnSave.clicked.connect(self.btnSaveonClick)
        self.ui.btnQuickScreenshot.clicked.connect(self.btnQuickScreenshotOnClick)

        # self.ui.btnExportAsy.clicked.connect(self.btnExportAsyOnClick)

        self.ui.btnDrawAxes.clicked.connect(self.btnDrawAxesOnClick)
#        self.ui.btnAsyfy.clicked.connect(lambda: self.asyfyCanvas(True))
        self.ui.btnSetZoom.clicked.connect(self.setMagPrompt)
        self.ui.btnResetPan.clicked.connect(self.resetPan)
        self.ui.btnPanCenter.clicked.connect(self.btnPanCenterOnClick)

        self.ui.btnTranslate.clicked.connect(self.btnTranslateonClick)
        self.ui.btnRotate.clicked.connect(self.btnRotateOnClick)
        self.ui.btnScale.clicked.connect(self.btnScaleOnClick)
        # self.ui.btnSelect.clicked.connect(self.btnSelectOnClick)
        self.ui.btnPan.clicked.connect(self.btnPanOnClick)

        # self.ui.btnDebug.clicked.connect(self.pauseBtnOnClick)
        self.ui.btnAlignX.clicked.connect(self.btnAlignXOnClick)
        self.ui.btnAlignY.clicked.connect(self.btnAlignYOnClick)
        self.ui.comboAnchor.currentIndexChanged.connect(self.handleAnchorComboIndex)
        self.ui.btnCustTransform.clicked.connect(self.btnCustTransformOnClick)
        self.ui.btnViewCode.clicked.connect(self.btnLoadEditorOnClick)

        self.ui.btnAnchor.clicked.connect(self.btnAnchorModeOnClick)

        self.ui.btnSelectColor.clicked.connect(self.btnColorSelectOnClick)
        self.ui.txtLineWidth.textEdited.connect(self.txtLineWithEdited)

        # self.ui.btnCreateCurve.clicked.connect(self.btnCreateCurveOnClick)
        self.ui.btnDrawGrid.clicked.connect(self.btnDrawGridOnClick)

        self.ui.btnAddCircle.clicked.connect(self.btnAddCircleOnClick)
        self.ui.btnAddPoly.clicked.connect(self.btnAddPolyOnClick)
        self.ui.btnAddLabel.clicked.connect(self.btnAddLabelOnClick)
        # self.ui.btnAddBezierInplace.clicked.connect(self.btnAddBezierInplaceOnClick)
        self.ui.btnClosedCurve.clicked.connect(self.btnAddClosedCurveOnClick)
        self.ui.btnOpenCurve.clicked.connect(self.btnAddOpenCurveOnClick)
        self.ui.btnClosedPoly.clicked.connect(self.btnAddClosedLineOnClick)
        self.ui.btnOpenPoly.clicked.connect(self.btnAddOpenLineOnClick)

        self.ui.btnFill.clicked.connect(self.btnFillOnClick)

        self.ui.btnSendBackwards.clicked.connect(self.btnSendBackwardsOnClick)
        self.ui.btnSendForwards.clicked.connect(self.btnSendForwardsOnClick)
        # self.ui.btnDelete.clicked.connect(self.btnSelectiveDeleteOnClick)
        self.ui.btnDeleteMode.clicked.connect(self.btnDeleteModeOnClick)
        # self.ui.btnSoftDelete.clicked.connect(self.btnSoftDeleteOnClick)
        self.ui.btnToggleVisible.clicked.connect(self.btnSetVisibilityOnClick)
        
        self.ui.btnEnterCommand.clicked.connect(self.btnTerminalCommandOnClick)
        self.ui.btnTogglePython.clicked.connect(self.btnTogglePythonOnClick)
        self.ui.btnSelectEdit.clicked.connect(self.btnSelectEditOnClick)

    def btnDeleteModeOnClick(self):
        self.currentModeStack = [SelectionMode.delete]
        self.ui.statusbar.showMessage('Delete Mode')
        self.clearSelection()
        self.updateChecks()

    def btnTerminalCommandOnClick(self):
        if self.terminalPythonMode:
            exec(self.ui.txtTerminalPrompt.text())
            self.fileChanged = True
        else:
            pass
            # TODO: How to handle this case?
            # Like AutoCAD? 
        self.ui.txtTerminalPrompt.clear()

    def btnFillOnClick(self, checked): 
        self.currAddOptions['fill'] = checked
        self.ui.btnOpenCurve.setEnabled(not checked)
        self.ui.btnOpenPoly.setEnabled(not checked)

    def btnSelectEditOnClick(self):
        self.ui.statusbar.showMessage('Edit mode')
        self.currentModeStack = [SelectionMode.selectEdit]
        self.updateChecks()

    @property
    def currentPen(self):
        return x2a.asyPen.fromAsyPen(self._currentPen)
        pass
    def debug(self):
        print('Put a breakpoint here.')

    def execPythonCmd(self):
        commandText, result = Qw.QInputDialog.getText(self, '', 'enter python cmd')
        if result:
            exec(commandText)

    def deleteAddOptions(self):
        if self.currAddOptionsWgt is not None:
            self.currAddOptionsWgt.hide()
            self.ui.addOptionLayout.removeWidget(self.currAddOptionsWgt)
            self.currAddOptionsWgt = None

    def updateOptionWidget(self):
        try:
            self.addMode.objectCreated.disconnect()
        except Exception:
            pass

        self.currentModeStack[-1] = None
        self.addMode.objectCreated.connect(self.addInPlace)
        self.updateModeBtnsOnly()


        self.deleteAddOptions()

        self.currAddOptionsWgt = self.addMode.createOptWidget(self.currAddOptions)
        if self.currAddOptionsWgt is not None:
            self.ui.addOptionLayout.addWidget(self.currAddOptionsWgt)

    def addInPlace(self, obj):
        obj.asyengine = self.asyEngine
        obj.pen = self.currentPen
        obj.onCanvas = self.xasyDrawObj
        obj.setKey(str(self.globalObjectCounter))
        self.globalObjectCounter = self.globalObjectCounter + 1

        self.fileItems.append(obj)
        self.fileChanged = True
        self.addObjCreationUrs(obj)
        self.asyfyCanvas()

    def addObjCreationUrs(self, obj):
        newAction = self.createAction(ObjCreationChanges(obj))
        self.undoRedoStack.add(newAction)
        self.checkUndoRedoButtons()

    def clearGuides(self):
        self.currentGuides.clear()
        self.quickUpdate()

    def btnAddCircleOnClick(self):
        self.addMode = InplaceAddObj.AddCircle(self)
        self.ui.statusbar.showMessage('')
        self.updateOptionWidget()

    LegacyHint='Click and drag to draw; right click or space bar to finalize'
    Hint='Click and drag to draw; release and click in place to add node; continue dragging'
    HintClose=' or c to close.'

    def drawHint(self):
        if self.settings['useLegacyDrawMode']:
            self.ui.statusbar.showMessage(self.LegacyHint+'.')
        else:
            self.ui.statusbar.showMessage(self.Hint+'.')

    def drawHintOpen(self):
        if self.settings['useLegacyDrawMode']:
            self.ui.statusbar.showMessage(self.LegacyHint+self.HintClose)
        else:
            self.ui.statusbar.showMessage(self.Hint+self.HintClose)

    def btnAddBezierInplaceOnClick(self):
        self.addMode = InplaceAddObj.AddBezierShape(self)
        self.updateOptionWidget()

    def btnAddOpenLineOnClick(self):
        self.currAddOptions['useBezier'] = False
        self.currAddOptions['closedPath'] = False
        self.drawHintOpen()
        self.btnAddBezierInplaceOnClick()

    def btnAddClosedLineOnClick(self):
        self.currAddOptions['useBezier'] = False
        self.currAddOptions['closedPath'] = True
        self.drawHint()
        self.btnAddBezierInplaceOnClick()

    def btnAddOpenCurveOnClick(self):
        self.currAddOptions['useBezier'] = True
        self.currAddOptions['closedPath'] = False
        self.drawHintOpen()
        self.btnAddBezierInplaceOnClick()

    def btnAddClosedCurveOnClick(self):
        self.currAddOptions['useBezier'] = True
        self.currAddOptions['closedPath'] = True
        self.drawHint()
        self.btnAddBezierInplaceOnClick()

    def btnAddPolyOnClick(self):
        self.addMode = InplaceAddObj.AddPoly(self)
        self.ui.statusbar.showMessage('')
        self.updateOptionWidget()

    def btnAddLabelOnClick(self):
        self.addMode = InplaceAddObj.AddLabel(self)
        self.ui.statusbar.showMessage('')
        self.updateOptionWidget()

    def updateCurve(self, valid, newCurve):
        self.previewCurve = newCurve
        self.quickUpdate()

    def addTransformationChanges(self, objIndex, transform, isLocal=False):
        self.undoRedoStack.add(self.createAction(TransformationChanges(objIndex, 
                            transform, isLocal)))
        self.checkUndoRedoButtons()

    def btnSendForwardsOnClick(self):
        if self.currentlySelectedObj['selectedIndex'] is not None:
            maj, minor = self.currentlySelectedObj['selectedIndex']
            selectedObj = self.drawObjects[maj][minor]
            index = self.fileItems.index(selectedObj.parent())

            self.clearSelection()
            if index == len(self.fileItems) - 1:
                return
            else:
                self.fileItems[index], self.fileItems[index + 1] = self.fileItems[index + 1], self.fileItems[index]
                self.asyfyCanvas()

    def btnSelectiveDeleteOnClick(self):
        if self.currentlySelectedObj['selectedIndex'] is not None:
            maj, minor = self.currentlySelectedObj['selectedIndex']
            selectedObj = self.drawObjects[maj][minor]

            parent = selectedObj.parent()

            if isinstance(parent, x2a.xasyScript):
                self.hiddenKeys.add((selectedObj.key, selectedObj.keyIndex))
                self.softDeleteObj((maj, minor))
            else:
                index = self.fileItems.index(selectedObj.parent())

                self.undoRedoStack.add(self.createAction(
                    HardDeletionChanges(selectedObj.parent(), index)
                ))
                self.checkUndoRedoButtons()
                
                self.fileItems.remove(selectedObj.parent())

            self.fileChanged = True
            self.clearSelection()
            self.asyfyCanvas()
        else:
            result = self.selectOnHover()
            if result:
                self.btnSelectiveDeleteOnClick()

    def btnSetVisibilityOnClick(self):
        if self.currentlySelectedObj['selectedIndex'] is not None:
            maj, minor = self.currentlySelectedObj['selectedIndex']
            selectedObj = self.drawObjects[maj][minor]

            self.hiddenKeys.symmetric_difference_update({(selectedObj.key, selectedObj.keyIndex)})
            self.clearSelection()
            self.quickUpdate()

    def btnSendBackwardsOnClick(self):
        if self.currentlySelectedObj['selectedIndex'] is not None:
            maj, minor = self.currentlySelectedObj['selectedIndex']
            selectedObj = self.drawObjects[maj][minor]
            index = self.fileItems.index(selectedObj.parent())

            self.clearSelection()
            if index == 0:
                return
            else:
                self.fileItems[index], self.fileItems[index - 1] = self.fileItems[index - 1], self.fileItems[index]
                self.asyfyCanvas()


    def btnUndoOnClick(self):
        self.undoRedoStack.undo()
        self.checkUndoRedoButtons()

    def btnRedoOnClick(self):
        self.undoRedoStack.redo()
        self.checkUndoRedoButtons()

    def checkUndoRedoButtons(self):
        self.ui.btnUndo.setEnabled(self.undoRedoStack.changesMade())
        self.ui.actionUndo.setEnabled(self.undoRedoStack.changesMade())

        self.ui.btnRedo.setEnabled(len(self.undoRedoStack.redoStack) > 0)
        self.ui.actionRedo.setEnabled(len(self.undoRedoStack.redoStack) > 0)

    def handleUndoChanges(self, change):
        assert isinstance(change, ActionChanges)
        if isinstance(change, TransformationChanges):
            self.transformObject(change.objIndex, change.transformation.inverted(), change.isLocal)
        elif isinstance(change, ObjCreationChanges):
            self.fileItems.pop()
        elif isinstance(change, HardDeletionChanges):
            self.fileItems.insert(change.objIndex, change.item)
        self.asyfyCanvas()

    def handleRedoChanges(self, change):
        assert isinstance(change, ActionChanges)
        if isinstance(change, TransformationChanges):
            self.transformObject(
                 change.objIndex, change.transformation, change.isLocal)
        elif isinstance(change, ObjCreationChanges):
            self.fileItems.append(change.object)
        elif isinstance(change, HardDeletionChanges):
            self.fileItems.remove(change.item)
        self.asyfyCanvas()

    #  is this a "pythonic" way?
    def createAction(self, changes):
        def _change():
            return self.handleRedoChanges(changes)

        def _undoChange():
            return self.handleUndoChanges(changes)

        return Urs.action((_change, _undoChange))

    def execCustomCommand(self, command):
        if command in self.commandsFunc:
            self.commandsFunc[command]()
        else:
            self.ui.statusbar.showMessage('Command {0} not found'.format(command))

    def enterCustomCommand(self):
        commandText, result = Qw.QInputDialog.getText(self, 'Enter Custom Command', 'Enter Custom Command')
        if result:
            self.execCustomCommand(commandText)

    def addItemFromPath(self, path):
        newItem = x2a.xasyShape(path, self.asyEngine, pen=self.currentPen)
        self.fileItems.append(newItem)
        self.fileChanged = True
        self.asyfyCanvas()

    def actionManual(self):
        asyManualURL = 'https://asymptote.sourceforge.io/asymptote.pdf'
        webbrowser.open_new(asyManualURL)

    def actionAbout(self):
        Qw.QMessageBox.about(self,"xasy","This is xasy "+xasyVersion.xasyVersion+"; a graphical front end to the Asymptote vector graphics language: https://asymptote.sourceforge.io/")

    def btnExportAsyOnClick(self):
        diag = Qw.QFileDialog(self)
        diag.setAcceptMode(Qw.QFileDialog.AcceptSave)

        formatId = {
            'pdf': {
                'name': 'PDF Files',
                'ext': ['*.pdf']
            },
            'svg': {
                'name': 'Scalable Vector Graphics',
                'ext': ['*.svg']
            },
            'eps': {
                'name': 'Postscript Files',
                'ext': ['*.eps']
            },
            'png': {
                'name': 'Portable Network Graphics',
                'ext': ['*.png']
            },
            '*': {
                'name': 'Any Files',
                'ext': ['*.*']
            }
        }

        formats = ['pdf', 'svg', 'eps', 'png', '*']

        formatText = ';;'.join('{0:s} ({1:s})'.format(formatId[form]['name'], ' '.join(formatId[form]['ext']))
                               for form in formats)

        if self.currDir is not None:
            diag.setDirectory(self.currDir)
            rawFile = os.path.splitext(os.path.basename(self.filename))[0] + '.pdf'
            diag.selectFile(rawFile)

        diag.setNameFilter(formatText)
        diag.show()
        result = diag.exec_()

        if result != diag.Accepted:
            return

        finalFiles = diag.selectedFiles()

        with io.StringIO() as finalCode:
            xf.saveFile(finalCode, self.fileItems, self.asy2psmap)
            finalString = finalCode.getvalue()

        for file in finalFiles:
            ext = os.path.splitext(file)
            if len(ext) < 2:
                ext = 'pdf'
            else:
                ext = ext[1][1:]

            with subprocess.Popen(args=[self.asyPath, '-f{0}'.format(ext), '-o{0}'.format(file), '-'], encoding='utf-8',
                                  stdin=subprocess.PIPE) as asy:
                print('test:', finalString)
                asy.stdin.write(finalString)
                asy.stdin.close()
                asy.wait(timeout=35)


    def loadKeyMaps(self):
        """Inverts the mapping of the key
           Input map is in format 'Action' : 'Key Sequence' """
        for action, key in self.keyMaps.options.items():
            shortcut = Qw.QShortcut(self)
            shortcut.setKey(Qg.QKeySequence(key))

            # hate doing this, but python doesn't have explicit way to pass a
            # string to a lambda without an identifier
            # attached to it.
            exec('shortcut.activated.connect(lambda: self.execCustomCommand("{0}"))'.format(action),
                 {'self': self, 'shortcut': shortcut})

    def initializeButtons(self):
        self.ui.btnDrawAxes.setChecked(self.settings['defaultShowAxes'])
        self.btnDrawAxesOnClick(self.settings['defaultShowAxes'])

        self.ui.btnDrawGrid.setChecked(self.settings['defaultShowGrid'])
        self.btnDrawGridOnClick(self.settings['defaultShowGrid'])

    def erase(self):
        self.fileItems.clear()
        self.fileChanged = False

    def actionOpen(self):
        if self.fileChanged:
            save="Save current file?"
            reply=Qw.QMessageBox.question(self,'Message',save,Qw.QMessageBox.Yes,
                                        Qw.QMessageBox.No)
            if reply == Qw.QMessageBox.Yes:
                self.actionSave()

        filename = Qw.QFileDialog.getOpenFileName(self, 'Open Asymptote File','', '*.asy')
        if filename[0]:
            self.loadFile(filename[0])

    def actionSave(self):
        if self.filename is None:
            self.actionSaveAs()
        else:
            saveFile = io.open(self.filename, 'w')
            xf.saveFile(saveFile, self.fileItems, self.asy2psmap)
            saveFile.close()
            self.updateScript()

    def updateScript(self):
        for item in self.fileItems:
            if isinstance(item, x2a.xasyScript):
                if item.updatedCode:
                    item.setScript(item.updatedCode)
                    item.updatedCode = None

    def actionSaveAs(self):
        saveLocation = Qw.QFileDialog.getSaveFileName(self, 'Save File')[0]
        if saveLocation:
            saveFile = io.open(saveLocation, 'w')
            xf.saveFile(saveFile, self.fileItems, self.asy2psmap)
            saveFile.close()
            self.filename = saveLocation
            self.updateScript()
            

    def btnQuickScreenshotOnClick(self):
        saveLocation = Qw.QFileDialog.getSaveFileName(self, 'Save Screenshot','')
        if saveLocation[0]:
            self.ui.imgLabel.pixmap().save(saveLocation[0])

    def btnLoadFileonClick(self):
        self.actionOpen()

    def btnSaveonClick(self):
        self.actionSave()

    @Qc.pyqtSlot(int)
    def handleAnchorComboIndex(self, index: int):
        self.anchorMode = index
        if self.anchorMode == AnchorMode.customAnchor:
            if self.customAnchor is not None:
                self.anchorMode = AnchorMode.customAnchor
            else:
                self.ui.comboAnchor.setCurrentIndex(AnchorMode.center)
                self.anchorMode = AnchorMode.center
        self.quickUpdate()
    def btnColorSelectOnClick(self):
        self.colorDialog.show()
        result = self.colorDialog.exec()
        if result == Qw.QDialog.Accepted:
            self._currentPen.setColorFromQColor(self.colorDialog.selectedColor())
            self.updateFrameDispColor()

    def txtLineWithEdited(self, text):
        new_val = xu.tryParse(text, float)
        if new_val is not None:
            if new_val > 0:
                self._currentPen.setWidth(new_val)

    def isReady(self):
        return self.mainCanvas is not None

    def resizeEvent(self, resizeEvent):
        # super().resizeEvent(resizeEvent)
        assert isinstance(resizeEvent, Qg.QResizeEvent)

        if self.isReady():
            if self.mainCanvas.isActive():
                self.mainCanvas.end()
            self.canvSize = self.ui.imgFrame.size()*devicePixelRatio
            self.ui.imgFrame.setSizePolicy(Qw.QSizePolicy.Ignored, Qw.QSizePolicy.Ignored)
            self.canvasPixmap = Qg.QPixmap(self.canvSize)
            self.canvasPixmap.setDevicePixelRatio(devicePixelRatio)
            self.postCanvasPixmap = Qg.QPixmap(self.canvSize)
            self.canvasPixmap.setDevicePixelRatio(devicePixelRatio)

            self.quickUpdate()

    def show(self):
        super().show()
        self.createMainCanvas()  # somehow, the coordinates doesn't get updated until after showing.
        self.initializeButtons()
        self.postShow()

    def postShow(self):
        self.handleArguments()

    def roundPositionSnap(self, oldPoint):
        minorGridSize = self.settings['gridMajorAxesSpacing'] / (self.settings['gridMinorAxesCount'] + 1)
        if isinstance(oldPoint, list) or isinstance(oldPoint, tuple):
            return [round(val / minorGridSize) * minorGridSize for val in oldPoint]
        elif isinstance(oldPoint, Qc.QPoint) or isinstance(oldPoint, Qc.QPointF):
            x, y = oldPoint.x(), oldPoint.y()
            x = round(x / minorGridSize) * minorGridSize
            y = round(y / minorGridSize) * minorGridSize
            return Qc.QPointF(x, y)
        else:
            raise Exception

    def getAsyCoordinates(self):
        canvasPosOrig = self.getCanvasCoordinates()
        return canvasPosOrig, canvasPosOrig

    def mouseMoveEvent(self, mouseEvent: Qg.QMouseEvent):  # TODO: Actually refine grid snapping...
        if not self.ui.imgLabel.underMouse() and not self.mouseDown:
            return 

        self.updateMouseCoordLabel()
        asyPos, canvasPos = self.getAsyCoordinates()

        # add mode 
        if self.addMode is not None:
            if self.addMode.active:
                self.addMode.mouseMove(asyPos, mouseEvent)
                self.quickUpdate()
            return

        # pan mode
        if self.currentModeStack[-1] == SelectionMode.pan and int(mouseEvent.buttons()) and self.savedWindowMousePos is not None:
            mousePos = self.getWindowCoordinates()
            newPos = mousePos - self.savedWindowMousePos

            tx, ty = newPos.x(), newPos.y()

            if self.lockX:
                tx = 0
            if self.lockY:
                ty = 0

            self.panOffset[0] += tx
            self.panOffset[1] += ty

            self.savedWindowMousePos = self.getWindowCoordinates()
            self.quickUpdate()
            return

        # otherwise, in transformation 
        if self.inMidTransformation:
            if self.currentModeStack[-1] == SelectionMode.translate:
                newPos = canvasPos - self.savedMousePosition
                if self.gridSnap:
                    newPos = self.roundPositionSnap(newPos)  # actually round to the nearest minor grid afterwards...

                self.tx, self.ty = newPos.x(), newPos.y()

                if self.lockX:
                    self.tx = 0
                if self.lockY:
                    self.ty = 0
                self.newTransform = Qg.QTransform.fromTranslate(self.tx, self.ty)

            elif self.currentModeStack[-1] == SelectionMode.rotate:
                if self.gridSnap:
                    canvasPos = self.roundPositionSnap(canvasPos)

                adjustedSavedMousePos = self.savedMousePosition - self.currentAnchor
                adjustedCanvasCoords = canvasPos - self.currentAnchor

                origAngle = np.arctan2(adjustedSavedMousePos.y(), adjustedSavedMousePos.x())
                newAng = np.arctan2(adjustedCanvasCoords.y(), adjustedCanvasCoords.x())
                self.deltaAngle = newAng - origAngle
                self.newTransform = xT.makeRotTransform(self.deltaAngle, self.currentAnchor).toQTransform()

            elif self.currentModeStack[-1] == SelectionMode.scale:
                if self.gridSnap:
                    canvasPos = self.roundPositionSnap(canvasPos)
                    x, y = int(round(canvasPos.x())), int(round(canvasPos.y()))  # otherwise it crashes...
                    canvasPos = Qc.QPoint(x, y)

                originalDeltaPts = self.savedMousePosition - self.currentAnchor
                scaleFactor = Qc.QPointF.dotProduct(canvasPos - self.currentAnchor, originalDeltaPts) /\
                    (xu.twonorm((originalDeltaPts.x(), originalDeltaPts.y())) ** 2)
                if not self.lockX:
                    self.scaleFactorX = scaleFactor
                else:
                    self.scaleFactorX = 1

                if not self.lockY:
                    self.scaleFactorY = scaleFactor
                else:
                    self.scaleFactorY = 1

                self.newTransform = xT.makeScaleTransform(self.scaleFactorX, self.scaleFactorY, self.currentAnchor).\
                    toQTransform()

            self.quickUpdate()
            return

        # otherwise, select a candidate for selection

        if self.currentlySelectedObj['selectedIndex'] is None:
            selectedIndex, selKeyList = self.selectObject()
            if selectedIndex is not None:
                if self.pendingSelectedObjList != selKeyList:
                    self.pendingSelectedObjList = selKeyList
                    self.pendingSelectedObjIndex = -1
            else:
                self.pendingSelectedObjList.clear()
                self.pendingSelectedObjIndex = -1
            self.quickUpdate()
            return 


    def mouseReleaseEvent(self, mouseEvent):
        assert isinstance(mouseEvent, Qg.QMouseEvent) 
        if not self.mouseDown:
            return

        self.tx=0
        self.ty=0
        self.mouseDown = False
        if self.addMode is not None:
            self.addMode.mouseRelease()
        if self.inMidTransformation:
            self.clearSelection()
        self.inMidTransformation = False
        self.quickUpdate()

    def clearSelection(self):
        if self.currentlySelectedObj['selectedIndex'] is not None:
            self.releaseTransform()
        self.setAllInSetEnabled(self.objButtons, False)
        self.currentlySelectedObj['selectedIndex'] = None
        self.currentlySelectedObj['key'] = None

        self.currentlySelectedObj['allSameKey'].clear()
        self.newTransform = Qg.QTransform()
        self.currentBoundingBox = None
        self.quickUpdate()

    def changeSelection(self, offset):
        if self.pendingSelectedObjList:
            if offset > 0:
                if self.pendingSelectedObjIndex + offset <= -1:
                    self.pendingSelectedObjIndex = self.pendingSelectedObjIndex + offset
            else:
                if self.pendingSelectedObjIndex + offset >= -len(self.pendingSelectedObjList):
                    self.pendingSelectedObjIndex = self.pendingSelectedObjIndex + offset

    def mouseWheel(self, rawAngleX: float, rawAngle: float, defaultModifiers: int=0):
        keyModifiers = int(Qw.QApplication.keyboardModifiers())
        keyModifiers = keyModifiers | defaultModifiers
        if keyModifiers & int(Qc.Qt.ControlModifier):
            oldMag = self.magnification

            factor=0.5/devicePixelRatio;
            cx, cy = self.canvSize.width()*factor, self.canvSize.height()*factor
            centerPoint = Qc.QPointF(cx, cy) * self.getScrsTransform().inverted()[0]

            self.magnification += (rawAngle/100)

            if self.magnification < self.settings['minimumMagnification']:
                self.magnification = self.settings['minimumMagnification']
            elif self.magnification > self.settings['maximumMagnification']:
                self.magnification = self.settings['maximumMagnification']

            # set the new pan. Let c be the fixed point (center point),
            # Let m the old mag, n the new mag

            # find t2 such that
            # mc + t1 = nc + t2 ==> t2 = (m - n)c + t1

            centerPoint = (oldMag - self.magnification) * centerPoint

            self.panOffset = [
                self.panOffset[0] + centerPoint.x(),
                self.panOffset[1] + centerPoint.y()
            ]

            self.currAddOptions['magnification'] = self.magnification

            if self.addMode is xbi.InteractiveBezierEditor:
                self.addMode.setSelectionBoundaries()

        elif keyModifiers & (int(Qc.Qt.ShiftModifier) | int(Qc.Qt.AltModifier)):
            self.panOffset[1] += rawAngle/1
            self.panOffset[0] -= rawAngleX/1
        # handle scrolling
        else:
            # process selection layer change
            if rawAngle >= 15:
                self.changeSelection(1)
            elif rawAngle <= -15:
                self.changeSelection(-1)
        self.quickUpdate()

    def wheelEvent(self, event: Qg.QWheelEvent):
        rawAngle = event.angleDelta().y() / 8
        rawAngleX = event.angleDelta().x() / 8
        self.mouseWheel(rawAngleX, rawAngle)

    def selectOnHover(self):
        """Returns True if selection happened, False otherwise.
        """
        if self.pendingSelectedObjList:
            selectedIndex = self.pendingSelectedObjList[self.pendingSelectedObjIndex]
            self.pendingSelectedObjList.clear()

            maj, minor = selectedIndex

            self.currentlySelectedObj['selectedIndex'] = selectedIndex
            self.currentlySelectedObj['key'],  self.currentlySelectedObj['allSameKey'] = self.selectObjectSet(
            )

            self.currentBoundingBox = self.drawObjects[maj][minor].boundingBox

            if self.selectAsGroup:
                for selItems in self.currentlySelectedObj['allSameKey']:
                    obj = self.drawObjects[selItems[0]][selItems[1]]
                    self.currentBoundingBox = self.currentBoundingBox.united(obj.boundingBox)

            self.origBboxTransform = self.drawObjects[maj][minor].transform.toQTransform()
            self.newTransform = Qg.QTransform()
            return True
        else:
            return False

    def mousePressEvent(self, mouseEvent: Qg.QMouseEvent):
        # we make an exception for bezier curve
        bezierException = False
        if self.addMode is not None:
            if self.addMode.active and isinstance(self.addMode, InplaceAddObj.AddBezierShape):
                bezierException = True
                
        if not self.ui.imgLabel.underMouse() and not bezierException:
            return

        self.mouseDown = True
        asyPos, self.savedMousePosition = self.getAsyCoordinates()

        if self.addMode is not None:
            self.addMode.mouseDown(asyPos, self.currAddOptions, mouseEvent)
        elif self.currentModeStack[-1] == SelectionMode.pan:
            self.savedWindowMousePos = self.getWindowCoordinates()
        elif self.currentModeStack[-1] == SelectionMode.setAnchor:
            self.customAnchor = self.savedMousePosition
            self.currentModeStack.pop()

            self.anchorMode = AnchorMode.customAnchor
            self.ui.comboAnchor.setCurrentIndex(AnchorMode.customAnchor)
            self.updateChecks()
            self.quickUpdate()
        elif self.inMidTransformation:
            pass
        elif self.pendingSelectedObjList:
            self.selectOnHover()

            if self.currentModeStack[-1] in {SelectionMode.translate, SelectionMode.rotate, SelectionMode.scale}:
                self.setAllInSetEnabled(self.objButtons, False)
                self.inMidTransformation = True
                self.setAnchor()
            elif self.currentModeStack[-1] == SelectionMode.delete:
                self.btnSelectiveDeleteOnClick()
            elif self.currentModeStack[-1] == SelectionMode.selectEdit:
                self.setupSelectEdit()
            else:
                self.setAllInSetEnabled(self.objButtons, True)
                self.inMidTransformation = False
                self.setAnchor()

        else:
            self.setAllInSetEnabled(self.objButtons, False)
            self.currentBoundingBox = None
            self.inMidTransformation = False
            self.clearSelection()

        self.quickUpdate()

    def removeAddMode(self):
        self.addMode = None
        self.deleteAddOptions()

    def editFinalized(self):
        self.addMode.forceFinalize()
        self.removeAddMode()
        self.fileChanged = True
        self.quickUpdate()

    def editRejected(self):
        self.addMode.resetObj()
        self.editFinalized()

    def setupSelectEdit(self):
        """For Select-Edit mode. For now, if the object selected is a bezier curve, opens up a bezier editor"""
        maj, minor = self.currentlySelectedObj['selectedIndex']
        obj = self.fileItems[maj]
        if isinstance(obj, x2a.xasyDrawnItem):
            # bezier path
            self.addMode = xbi.InteractiveBezierEditor(self, obj, self.currAddOptions)
            self.addMode.objectUpdated.connect(self.objectUpdated)
            self.addMode.editAccepted.connect(self.editFinalized)
            self.addMode.editRejected.connect(self.editRejected)
            self.updateOptionWidget()
            self.currentModeStack[-1] = SelectionMode.selectEdit
            self.fileChanged = True
        else:
            self.clearSelection()
        self.quickUpdate()

    def setAnchor(self):
        if self.anchorMode == AnchorMode.center:
            self.currentAnchor = self.currentBoundingBox.center()
        elif self.anchorMode == AnchorMode.topLeft:
            self.currentAnchor = self.currentBoundingBox.topLeft()
        elif self.anchorMode == AnchorMode.topRight:
            self.currentAnchor = self.currentBoundingBox.topRight()
        elif self.anchorMode == AnchorMode.bottomLeft:
            self.currentAnchor = self.currentBoundingBox.bottomLeft()
        elif self.anchorMode == AnchorMode.bottomRight:
            self.currentAnchor = self.currentBoundingBox.bottomRight()
        elif self.anchorMode == AnchorMode.customAnchor:
            self.currentAnchor = self.customAnchor
        else:
            self.currentAnchor = Qc.QPointF(0, 0)

        if self.anchorMode != AnchorMode.origin:
            pass
            # TODO: Record base points/bbox before hand and use that for
            # anchor?
            # adjTransform =
            # self.drawObjects[selectedIndex].transform.toQTransform()
            # self.currentAnchor = adjTransform.map(self.currentAnchor)


    def releaseTransform(self):
        if self.newTransform.isIdentity():
            return
        newTransform = x2a.asyTransform.fromQTransform(self.newTransform)
        objKey = self.currentlySelectedObj['selectedIndex']
        self.addTransformationChanges(objKey, newTransform, not self.useGlobalCoords)
        self.transformObject(objKey, newTransform, not self.useGlobalCoords)

    def adjustTransform(self, appendTransform):
        self.screenTransformation = self.screenTransformation * appendTransform

    def createMainCanvas(self):
        self.canvSize = devicePixelRatio*self.ui.imgFrame.size()
        self.ui.imgFrame.setSizePolicy(Qw.QSizePolicy.Ignored, Qw.QSizePolicy.Ignored)
        factor=0.5/devicePixelRatio;
        x, y = self.canvSize.width()*factor, self.canvSize.height()*factor

        self.canvasPixmap = Qg.QPixmap(self.canvSize)
        self.canvasPixmap.setDevicePixelRatio(devicePixelRatio)

        self.canvasPixmap.fill()

        self.finalPixmap = Qg.QPixmap(self.canvSize)
        self.finalPixmap.setDevicePixelRatio(devicePixelRatio)

        self.postCanvasPixmap = Qg.QPixmap(self.canvSize)
        self.postCanvasPixmap.setDevicePixelRatio(devicePixelRatio)

        self.mainCanvas = Qg.QPainter(self.canvasPixmap)
        self.mainCanvas.setRenderHint(Qg.QPainter.Antialiasing)
        self.mainCanvas.setRenderHint(Qg.QPainter.SmoothPixmapTransform)
        self.mainCanvas.setRenderHint(Qg.QPainter.HighQualityAntialiasing)
        self.xasyDrawObj['canvas'] = self.mainCanvas

        self.mainTransformation = Qg.QTransform()
        self.mainTransformation.scale(1, 1)
        self.mainTransformation.translate(x, y)

        self.mainCanvas.setTransform(self.getScrsTransform(), True)

        self.ui.imgLabel.setPixmap(self.canvasPixmap)

    def resetPan(self):
        self.panOffset = [0, 0]
        self.quickUpdate()

    def btnPanCenterOnClick(self):
        newCenter = self.getAllBoundingBox().center()

        # adjust to new magnification
        # technically, doable through getscrstransform()
        # and subtract pan offset and center points
        # but it's much more work...
        newCenter = self.magnification * newCenter
        self.panOffset = [-newCenter.x(), newCenter.y()]
        
        self.quickUpdate()

    def selectObject(self):
        if not self.ui.imgLabel.underMouse():
            return None, []
        canvasCoords = self.getCanvasCoordinates()
        highestDrawPriority = -np.inf
        collidedObjKey = None
        rawObjNumList = []
        for objKeyMaj in range(len(self.drawObjects)):
            for objKeyMin in range(len(self.drawObjects[objKeyMaj])):
                obj = self.drawObjects[objKeyMaj][objKeyMin]
                if obj.collide(canvasCoords) and (obj.key, obj.keyIndex) not in self.hiddenKeys:
                    rawObjNumList.append(((objKeyMaj, objKeyMin), obj.drawOrder))
                    if obj.drawOrder > highestDrawPriority:
                        collidedObjKey = (objKeyMaj, objKeyMin)
        if collidedObjKey is not None:
            rawKey = self.drawObjects[collidedObjKey[0]][collidedObjKey[1]].key
#            self.ui.statusbar.showMessage('Collide with {0}, Key is {1}'.format(str(collidedObjKey), rawKey), 2500)
            self.ui.statusbar.showMessage('Key: {0}'.format(rawKey), 2500)
            return collidedObjKey, [rawObj[0] for rawObj in sorted(rawObjNumList, key=lambda ordobj: ordobj[1])]
        else:
            return None, []

    def selectObjectSet(self):
        objKey = self.currentlySelectedObj['selectedIndex']
        if objKey is None:
            return set()
        assert isinstance(objKey, (tuple, list)) and len(objKey) == 2
        rawObj = self.drawObjects[objKey[0]][objKey[1]]
        rawKey = rawObj.key
        rawSet = {objKey}
        for objKeyMaj in range(len(self.drawObjects)):
            for objKeyMin in range(len(self.drawObjects[objKeyMaj])):
                obj = self.drawObjects[objKeyMaj][objKeyMin]
                if obj.key == rawKey:
                    rawSet.add((objKeyMaj, objKeyMin))
        return rawKey, rawSet

    def getCanvasCoordinates(self):
        # assert self.ui.imgLabel.underMouse()
        uiPos = self.mapFromGlobal(Qg.QCursor.pos())
        canvasPos = self.ui.imgLabel.mapFrom(self, uiPos)

        # Issue: For magnification, should xasy treats this at xasy level, or asy level?
        return canvasPos * self.getScrsTransform().inverted()[0]

    def getWindowCoordinates(self):
        # assert self.ui.imgLabel.underMouse()
        return self.mapFromGlobal(Qg.QCursor.pos())
        
    def refreshCanvas(self):
        if self.mainCanvas.isActive():
            self.mainCanvas.end()
        self.mainCanvas.begin(self.canvasPixmap)
        self.mainCanvas.setTransform(self.getScrsTransform())

    def asyfyCanvas(self, force=False):
        self.drawObjects = []
        self.populateCanvasWithItems(force)
        self.quickUpdate()
        if self.currentModeStack[-1] == SelectionMode.translate:
            self.ui.statusbar.showMessage(self.strings.asyfyComplete)

    def updateMouseCoordLabel(self):
        *args, canvasPos = self.getAsyCoordinates()
        nx, ny = self.asy2psmap.inverted() * (canvasPos.x(), canvasPos.y())
        self.coordLabel.setText('{0:.2f}, {1:.2f}    '.format(nx, ny))

    def quickUpdate(self):
        self.updateMouseCoordLabel()
        self.refreshCanvas()

        self.preDraw(self.mainCanvas)
        self.quickDraw()

        self.mainCanvas.end()
        self.postDraw()
        self.updateScreen()

    def quickDraw(self):
        assert self.isReady()
        dpi = self.magnification * self.dpi
        activeItem = None
        for majorItem in self.drawObjects:
            for item in majorItem:
                # hidden objects - toggleable
                if (item.key, item.keyIndex) in self.hiddenKeys:
                    continue
                isSelected = item.key == self.currentlySelectedObj['key']
                if not self.selectAsGroup and isSelected and self.currentlySelectedObj['selectedIndex'] is not None:
                    maj, min_ = self.currentlySelectedObj['selectedIndex']
                    isSelected = isSelected and item is self.drawObjects[maj][min_]
                if isSelected and self.settings['enableImmediatePreview']:
                    activeItem = item
                    if self.useGlobalCoords:
                        item.draw(self.newTransform, canvas=self.mainCanvas, dpi=dpi)
                    else:
                        item.draw(self.newTransform, applyReverse=True, canvas=self.mainCanvas, dpi=dpi)
                else:
                    item.draw(canvas=self.mainCanvas, dpi=dpi)

        if self.settings['drawSelectedOnTop']:
            if self.pendingSelectedObjList:
                maj, minor = self.pendingSelectedObjList[self.pendingSelectedObjIndex]
                self.drawObjects[maj][minor].draw(canvas=self.mainCanvas, dpi=dpi)
            # and apply the preview too... 
            elif activeItem is not None:
                if self.useGlobalCoords:
                    activeItem.draw(self.newTransform, canvas=self.mainCanvas, dpi=dpi)
                else:
                    activeItem.draw(self.newTransform, applyReverse=True, canvas=self.mainCanvas, dpi=dpi)
                activeItem = None

    def updateScreen(self):
        self.finalPixmap = Qg.QPixmap(self.canvSize)
        self.finalPixmap.setDevicePixelRatio(devicePixelRatio)
        self.finalPixmap.fill(Qc.Qt.black)
        with Qg.QPainter(self.finalPixmap) as finalPainter:
            drawPoint = Qc.QPoint(0, 0)
            finalPainter.drawPixmap(drawPoint, self.canvasPixmap)
            finalPainter.drawPixmap(drawPoint, self.postCanvasPixmap)
        self.ui.imgLabel.setPixmap(self.finalPixmap)

    def drawCartesianGrid(self, preCanvas):
        majorGrid = self.settings['gridMajorAxesSpacing'] * self.asy2psmap.xx
        minorGridCount = self.settings['gridMinorAxesCount']

        majorGridCol = Qg.QColor(self.settings['gridMajorAxesColor'])
        minorGridCol = Qg.QColor(self.settings['gridMinorAxesColor'])

        panX, panY = self.panOffset

        factor=0.5/devicePixelRatio;
        cx, cy = self.canvSize.width()*factor, self.canvSize.height()*factor

        x_range = (cx + (2 * abs(panX)))/self.magnification
        y_range = (cy + (2 * abs(panY)))/self.magnification

        for x in np.arange(0, 2 * x_range + 1, majorGrid):  # have to do
            # this in two stages...
            preCanvas.setPen(minorGridCol)
            for xMinor in range(1, minorGridCount + 1):
                xCoord = x + ((xMinor / (minorGridCount + 1)) * majorGrid)
                preCanvas.drawLine(Qc.QLine(xCoord, -9999, xCoord, 9999))
                preCanvas.drawLine(Qc.QLine(-xCoord, -9999, -xCoord, 9999))

        for y in np.arange(0, 2 * y_range + 1, majorGrid):
            preCanvas.setPen(minorGridCol)
            for yMinor in range(1, minorGridCount + 1):
                yCoord = y + ((yMinor / (minorGridCount + 1)) * majorGrid)
                preCanvas.drawLine(Qc.QLine(-9999, yCoord, 9999, yCoord))
                preCanvas.drawLine(Qc.QLine(-9999, -yCoord, 9999, -yCoord))

            preCanvas.setPen(majorGridCol)
            preCanvas.drawLine(Qc.QLine(-9999, y, 9999, y))
            preCanvas.drawLine(Qc.QLine(-9999, -y, 9999, -y))

        for x in np.arange(0, 2 * x_range + 1, majorGrid):
            preCanvas.setPen(majorGridCol)
            preCanvas.drawLine(Qc.QLine(x, -9999, x, 9999))
            preCanvas.drawLine(Qc.QLine(-x, -9999, -x, 9999))

    def drawPolarGrid(self, preCanvas):
        center = Qc.QPointF(0, 0)
        majorGridCol = Qg.QColor(self.settings['gridMajorAxesColor'])
        minorGridCol = Qg.QColor(self.settings['gridMinorAxesColor'])
        majorGrid = self.settings['gridMajorAxesSpacing']
        minorGridCount = self.settings['gridMinorAxesCount']

        majorAxisAng = (np.pi/4)  # 45 degrees - for now.
        minorAxisCount = 2  # 15 degrees each

        subRadiusSize = int(round((majorGrid / (minorGridCount + 1))))
        subAngleSize = majorAxisAng / (minorAxisCount + 1)

        for radius in range(majorGrid, 9999 + 1, majorGrid):
            preCanvas.setPen(majorGridCol)
            preCanvas.drawEllipse(center, radius, radius)

            preCanvas.setPen(minorGridCol)

            for minorRing in range(minorGridCount):
                subRadius = round(radius - (subRadiusSize * (minorRing + 1)))
                preCanvas.drawEllipse(center, subRadius, subRadius)

        currAng = majorAxisAng
        while currAng <= (2 * np.pi):
            preCanvas.setPen(majorGridCol)
            p1 = center + (9999 * Qc.QPointF(np.cos(currAng), np.sin(currAng)))
            preCanvas.drawLine(Qc.QLineF(center, p1))

            preCanvas.setPen(minorGridCol)
            for minorAngLine in range(minorAxisCount):
                newAng = currAng - (subAngleSize * (minorAngLine + 1))
                p1 = center + (9999 * Qc.QPointF(np.cos(newAng), np.sin(newAng)))
                preCanvas.drawLine(Qc.QLineF(center, p1))

            currAng = currAng + majorAxisAng

    def preDraw(self, painter):
        self.canvasPixmap.fill()
        preCanvas = painter

        preCanvas.setTransform(self.getScrsTransform())

        if self.drawAxes:
            preCanvas.setPen(Qc.Qt.gray)
            preCanvas.drawLine(Qc.QLine(-9999, 0, 9999, 0))
            preCanvas.drawLine(Qc.QLine(0, -9999, 0, 9999))

        if self.drawGrid:
            if self.drawGridMode == GridMode.cartesian:
                self.drawCartesianGrid(painter)
            elif self.drawGridMode == GridMode.polar:
                self.drawPolarGrid(painter)

        if self.currentGuides:
            for guide in self.currentGuides:
                guide.drawShape(preCanvas)
        # preCanvas.end()

    def drawAddModePreview(self, painter):
        if self.addMode is not None:
            if self.addMode.active:
                # Preview Object
                if self.addMode.getPreview() is not None:
                    painter.setPen(self.currentPen.toQPen())
                    painter.drawPath(self.addMode.getPreview())
                self.addMode.postDrawPreview(painter)
                

    def drawTransformPreview(self, painter):
        if self.currentBoundingBox is not None and self.currentlySelectedObj['selectedIndex'] is not None:
            painter.save()
            maj, minor = self.currentlySelectedObj['selectedIndex']
            selObj = self.drawObjects[maj][minor]
            if not self.useGlobalCoords:
                painter.save()
                painter.setTransform(
                    selObj.transform.toQTransform(), True)
                # painter.setTransform(selObj.baseTransform.toQTransform(), True)
                painter.setPen(Qc.Qt.gray)
                painter.drawLine(Qc.QLine(-9999, 0, 9999, 0))
                painter.drawLine(Qc.QLine(0, -9999, 0, 9999))
                painter.setPen(Qc.Qt.black)
                painter.restore()

                painter.setTransform(selObj.getInteriorScrTransform(
                    self.newTransform).toQTransform(), True)
                painter.drawRect(selObj.localBoundingBox)
            else:
                painter.setTransform(self.newTransform, True)
                painter.drawRect(self.currentBoundingBox)
            painter.restore()

    def postDraw(self):
        self.postCanvasPixmap.fill(Qc.Qt.transparent)
        with Qg.QPainter(self.postCanvasPixmap) as postCanvas:
            postCanvas.setRenderHints(self.mainCanvas.renderHints())
            postCanvas.setTransform(self.getScrsTransform())

            self.drawTransformPreview(postCanvas)

            if self.pendingSelectedObjList:
                maj, minor = self.pendingSelectedObjList[self.pendingSelectedObjIndex]
                postCanvas.drawRect(self.drawObjects[maj][minor].boundingBox)
                
            self.drawAddModePreview(postCanvas)

            if self.customAnchor is not None and self.anchorMode == AnchorMode.customAnchor:
                self.drawAnchorCursor(postCanvas)

            # postCanvas.drawRect(self.getAllBoundingBox())

    def drawAnchorCursor(self, painter):
        painter.drawEllipse(self.customAnchor, 6, 6)
        newCirclePath = Qg.QPainterPath()
        newCirclePath.addEllipse(self.customAnchor, 2, 2)

        painter.fillPath(newCirclePath, Qg.QColor.fromRgb(0, 0, 0))

    def updateModeBtnsOnly(self):
        if self.currentModeStack[-1] == SelectionMode.translate:
            activeBtn = self.ui.btnTranslate
        elif self.currentModeStack[-1] == SelectionMode.rotate:
            activeBtn = self.ui.btnRotate
        elif self.currentModeStack[-1] == SelectionMode.scale:
            activeBtn = self.ui.btnScale
        elif self.currentModeStack[-1] == SelectionMode.pan:
            activeBtn = self.ui.btnPan
        elif self.currentModeStack[-1] == SelectionMode.setAnchor:
            activeBtn = self.ui.btnAnchor
        elif self.currentModeStack[-1] == SelectionMode.delete:
            activeBtn = self.ui.btnDeleteMode
        elif self.currentModeStack[-1] == SelectionMode.selectEdit:
            activeBtn = self.ui.btnSelectEdit
        else:
            activeBtn = None

        
        disableFill = isinstance(self.addMode, InplaceAddObj.AddBezierShape) and not self.currAddOptions['closedPath']
        self.ui.btnFill.setEnabled(not disableFill)
        if disableFill and self.ui.btnFill.isEnabled():
            self.ui.btnFill.setChecked(not disableFill)


        for button in self.modeButtons:
            button.setChecked(button is activeBtn)

    def updateChecks(self):
        self.removeAddMode()
        self.updateModeBtnsOnly()
        self.quickUpdate()

    def btnAlignXOnClick(self, checked):
        self.lockY = checked
        if self.lockX:
            self.lockX = False
            self.ui.btnAlignY.setChecked(False)

    def btnAlignYOnClick(self, checked):
        self.lockX = checked
        if self.lockY:
            self.lockY = False
            self.ui.btnAlignX.setChecked(False)

    def btnAnchorModeOnClick(self):
        if self.currentModeStack[-1] != SelectionMode.setAnchor:
            self.currentModeStack.append(SelectionMode.setAnchor)
            self.updateChecks()

    def switchToAnchorMode(self):
        if self.currentModeStack[-1] != SelectionMode.setAnchor:
            self.currentModeStack.append(SelectionMode.setAnchor)
            self.updateChecks()

    def btnTranslateonClick(self):
        self.currentModeStack = [SelectionMode.translate]
        self.ui.statusbar.showMessage('Translate mode')
        self.clearSelection()
        self.updateChecks()

    def btnRotateOnClick(self):
        self.currentModeStack = [SelectionMode.rotate]
        self.ui.statusbar.showMessage('Rotate mode')
        self.clearSelection()
        self.updateChecks()

    def btnScaleOnClick(self):
        self.currentModeStack = [SelectionMode.scale]
        self.ui.statusbar.showMessage('Scale mode')
        self.clearSelection()
        self.updateChecks()

    def btnPanOnClick(self):
        self.currentModeStack = [SelectionMode.pan]
        self.ui.statusbar.showMessage('Pan mode')
        self.clearSelection()
        self.updateChecks()

    def btnWorldCoordsOnClick(self, checked):
        self.useGlobalCoords = checked
        if not self.useGlobalCoords:
            self.ui.comboAnchor.setCurrentIndex(AnchorMode.origin)
        self.setAllInSetEnabled(self.globalTransformOnlyButtons, checked)

    def setAllInSetEnabled(self, widgetSet, enabled):
        for widget in widgetSet:
            widget.setEnabled(enabled)

    def btnDrawAxesOnClick(self, checked):
        self.drawAxes = checked
        self.quickUpdate()

    def btnDrawGridOnClick(self, checked):
        self.drawGrid = checked
        self.quickUpdate()

    def btnCustTransformOnClick(self):
        matrixDialog = CustMatTransform.CustMatTransform()
        matrixDialog.show()
        result = matrixDialog.exec_()
        if result == Qw.QDialog.Accepted:
            objKey = self.currentlySelectedObj['selectedIndex']
            self.transformObject(objKey,
                matrixDialog.getTransformationMatrix(), not
                self.useGlobalCoords)

        # for now, unless we update the bouding box transformation.
        self.clearSelection()
        self.quickUpdate()

    def btnLoadEditorOnClick(self):
        if self.fileChanged:
            save = "Save current file?"
            reply = Qw.QMessageBox.question(self, 'Message', save, Qw.QMessageBox.Yes,
                                            Qw.QMessageBox.No)
            if reply == Qw.QMessageBox.Yes:
                self.actionSave()
                
        subprocess.Popen(args=self.getExternalEditor(asypath=self.filename));

    def btnAddCodeOnClick(self):
        header = """
// xasy object created at $time 
// Object Number: $uid
// This header is automatically generated by xasy. 
// Your code here
"""
        header = string.Template(header).substitute(time=str(datetime.datetime.now()), uid=str(self.globalObjectCounter))
                
        with tempfile.TemporaryDirectory() as tmpdir:
            newPath = os.path.join(tmpdir, 'tmpcode.asy')
            f = io.open(newPath, 'w')
            f.write(header)
            f.close()

            subprocess.run(args=self.getExternalEditor(asypath=newPath))

            f = io.open(newPath, 'r')
            newItem = x2a.xasyScript(engine=self.asyEngine, canvas=self.xasyDrawObj)
            newItem.setScript(f.read())
            f.close()

        # newItem.replaceKey(str(self.globalObjectCounter) + ':')
        self.fileItems.append(newItem)
        self.addObjCreationUrs(newItem)
        self.asyfyCanvas()

        self.globalObjectCounter = self.globalObjectCounter + 1
    def softDeleteObj(self, objKey):
        maj, minor = objKey
        drawObj = self.drawObjects[maj][minor]
        item = drawObj.originalObj
        key = drawObj.key
        keyIndex = drawObj.keyIndex


        item.transfKeymap[key][keyIndex].deleted = True
        # item.asyfied = False

    def getSelectedObjInfo(self, objIndex):
        maj, minor = objIndex
        drawObj = self.drawObjects[maj][minor]
        item = drawObj.originalObj
        key = drawObj.key
        keyIndex = drawObj.keyIndex

        return item, key, keyIndex

    def transformObjKey(self, item, key, keyIndex, transform, applyFirst=False, drawObj=None):
        if isinstance(transform, np.ndarray):
            obj_transform = x2a.asyTransform.fromNumpyMatrix(transform)
        elif isinstance(transform, Qg.QTransform):
            assert transform.isAffine()
            obj_transform = x2a.asyTransform.fromQTransform(transform)
        else:
            obj_transform = transform

        scr_transform = obj_transform

        if not applyFirst:
            item.transfKeymap[key][keyIndex] = obj_transform * \
                item.transfKeymap[key][keyIndex]
            if drawObj is not None:
                drawObj.transform = scr_transform * drawObj.transform
        else:
            item.transfKeymap[key][keyIndex] = item.transfKeymap[key][keyIndex] * obj_transform
            if drawObj is not None:
                drawObj.transform = drawObj.transform * scr_transform

        if self.selectAsGroup:
            for (maj2, min2) in self.currentlySelectedObj['allSameKey']:
                if (maj2, min2) == (maj, minor):
                    continue
                obj = self.drawObjects[maj2][min2]
                newIndex = obj.keyIndex
                if not applyFirst:
                    item.transfKeymap[key][newIndex] = obj_transform * \
                        item.transfKeymap[key][newIndex]
                    obj.transform = scr_transform * obj.transform
                else:
                    item.transfKeymap[key][newIndex] = item.transfKeymap[key][newIndex] * obj_transform
                    obj.transform = obj.transform * scr_transform

        self.fileChanged = True
        self.quickUpdate()

    def transformObject(self, objKey, transform, applyFirst=False):
        maj, minor = objKey
        drawObj = self.drawObjects[maj][minor]
        item, key, keyIndex = self.getSelectedObjInfo(objKey)
        self.transformObjKey(item, key, keyIndex, transform, applyFirst, drawObj)

    def initializeEmptyFile(self):
        pass

    def getExternalEditor(self, **kwargs) -> str:
        editor = os.getenv("VISUAL")
        if(editor == None) :
            editor = os.getenv("EDITOR")
        if(editor == None) :
            rawExternalEditor = self.settings['externalEditor']
            rawExtEditorArgs = self.settings['externalEditorArgs']
        else:
            s = editor.split()
            rawExternalEditor = s[0]
            rawExtEditorArgs = s[1:]+["$asypath"]
            
        execEditor = [rawExternalEditor]

        for arg in rawExtEditorArgs:
            execEditor.append(string.Template(arg).substitute(**kwargs))

        return execEditor


    def loadFile(self, name):
        filename = os.path.abspath(name)
        if not os.path.isfile(filename):
            filename = filename + '.asy'

        if not os.path.isfile(filename):
            self.ui.statusbar.showMessage('File {0} not found'.format(filename))
            return

        self.ui.statusbar.showMessage('Load {0}'.format(filename))
        self.filename = filename
        self.currDir = os.path.dirname(self.filename)

        self.erase()

        f = open(self.filename, 'rt')
        try:
            rawFileStr = f.read()
        except IOError:
            Qw.QMessageBox.critical(self, self.strings.fileOpenFailed, self.strings.fileOpenFailedText)
        else:
            rawText, transfDict, maxKey = xf.extractTransformsFromFile(rawFileStr)
            item = x2a.xasyScript(canvas=self.xasyDrawObj, engine=self.asyEngine, transfKeyMap=transfDict)

            item.setScript(rawText)
            self.fileItems.append(item)
            self.asyfyCanvas(True)

            maxKey2 = item.getMaxKeyCounter()
            self.asy2psmap = item.asy2psmap
            self.globalObjectCounter = max(maxKey + 1, maxKey2)
        finally:
            f.close()

    def populateCanvasWithItems(self, forceUpdate=False):
        self.itemCount = 0
        for item in self.fileItems:
            self.drawObjects.append(item.generateDrawObjects(forceUpdate))