# -*- coding: utf-8 -*-

"""
***************************************************************************
    ProcessingConfig.py
    ---------------------
    Date                 : August 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf at gmail dot com
***************************************************************************
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

import os.path
from PyQt4 import QtGui,QtCore
from processing.tools.system import *


class ProcessingConfig:

    OUTPUT_FOLDER = 'OUTPUT_FOLDER'
    RASTER_STYLE = 'RASTER_STYLE'
    VECTOR_POINT_STYLE = 'VECTOR_POINT_STYLE'
    VECTOR_LINE_STYLE = 'VECTOR_LINE_STYLE'
    VECTOR_POLYGON_STYLE = 'VECTOR_POLYGON_STYLE'
    SHOW_RECENT_ALGORITHMS = 'SHOW_RECENT_ALGORITHMS'
    USE_SELECTED = 'USE_SELECTED'
    USE_FILENAME_AS_LAYER_NAME = 'USE_FILENAME_AS_LAYER_NAME'
    KEEP_DIALOG_OPEN = 'KEEP_DIALOG_OPEN'
    SHOW_DEBUG_IN_DIALOG = 'SHOW_DEBUG_IN_DIALOG'
    RECENT_ALGORITHMS = 'RECENT_ALGORITHMS'
    PRE_EXECUTION_SCRIPT = 'PRE_EXECUTION_SCRIPT'
    POST_EXECUTION_SCRIPT = 'POST_EXECUTION_SCRIPT'
    SHOW_CRS_DEF = 'SHOW_CRS_DEF'
    WARN_UNMATCHING_CRS = 'WARN_UNMATCHING_CRS'

    settings = {}
    settingIcons = {}

    @staticmethod
    def initialize():
        icon = QtGui.QIcon(os.path.dirname(__file__) + '/../images/alg.png')
        ProcessingConfig.settingIcons['General'] = icon
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.SHOW_DEBUG_IN_DIALOG,
                'Show extra info in Log panel', True))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.KEEP_DIALOG_OPEN,
                'Keep dialog open after running an algorithm', False))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.USE_SELECTED,
                'Use only selected features', True))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.USE_FILENAME_AS_LAYER_NAME,
                'Use filename as layer name', False))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.SHOW_RECENT_ALGORITHMS,
                'Show recently executed algorithms', True))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.OUTPUT_FOLDER,
                'Output folder', tempFolder()))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.SHOW_CRS_DEF,
                'Show layer CRS definition in selection boxes', True))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.WARN_UNMATCHING_CRS,
                "Warn before executing if layer CRS's do not match", True))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.RASTER_STYLE,
                'Style for raster layers', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.VECTOR_POINT_STYLE,
                'Style for point layers', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.VECTOR_LINE_STYLE,
                'Style for line layers', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.VECTOR_POLYGON_STYLE,
                'Style for polygon layers', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.VECTOR_POLYGON_STYLE,
                'Style for polygon layers', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.PRE_EXECUTION_SCRIPT,
                'Pre-execution script', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.POST_EXECUTION_SCRIPT,
                'Post-execution script', ''))
        ProcessingConfig.addSetting(Setting('General',
                ProcessingConfig.RECENT_ALGORITHMS,
                'Recent algs', '', hidden=True))

    @staticmethod
    def setGroupIcon(group, icon):
        ProcessingConfig.settingIcons[group] = icon

    @staticmethod
    def getGroupIcon(group):
        if group == 'General':
            return QtGui.QIcon(os.path.dirname(__file__) + '/../images/alg.png'
                               )
        if group in ProcessingConfig.settingIcons:
            return ProcessingConfig.settingIcons[group]
        else:
            return QtGui.QIcon(
                    os.path.dirname(__file__) + '/../images/alg.png')

    @staticmethod
    def addSetting(setting):
        ProcessingConfig.settings[setting.name] = setting

    @staticmethod
    def removeSetting(name):
        del ProcessingConfig.settings[name]

    @staticmethod
    def getSettings():
        '''Return settings as a dict with group names as keys and lists of settings as values'''
        settings = {}
        for setting in ProcessingConfig.settings.values():
            if not setting.group in settings:
                group = []
                settings[setting.group] = group
            else:
                group = settings[setting.group]
            group.append(setting)
        return settings


    @staticmethod
    def readSettings():
        for setting in ProcessingConfig.settings.values():
            setting.read()


    @staticmethod
    def getSetting(name):
        if name in ProcessingConfig.settings.keys():
            v = ProcessingConfig.settings[name].value
            if isinstance(v, QtCore.QPyNullVariant):
                v = None
            return v
        else:
            return None

    @staticmethod
    def setSettingValue(name, value):
        if name in ProcessingConfig.settings.keys():
            ProcessingConfig.settings[name].value = value
            ProcessingConfig.settings[name].save()


class Setting:
    """A simple config parameter that will appear on the config dialog.
    """
    STRING = 0
    FILE = 1
    FOLDER = 2

    def __init__(self, group, name, description, default, hidden=False, valuetype = None):
        self.group = group
        self.name = name
        self.qname = "Processing/Configuration/" + self.name
        self.description = description
        self.default = default
        self.value = default
        self.hidden = hidden
        self.valuetype = valuetype

    def read(self):
        qsettings = QSettings()
        value = qsettings.value(self.qname, None)
        if value is not None:
            if isinstance(self.value, bool):
                value = str(value).lower() == str(True).lower()
            self.value = value

    def save(self):
        QSettings().setValue(self.qname, self.value)

    def __str__(self):
        return self.name + '=' + str(self.value)