import logging
import os
import sys
from os.path import exists
from importlib import import_module

from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QDialog, QHBoxLayout, QLabel, QListWidget, QListWidgetItem, QVBoxLayout
from configobj import ConfigObj

from .constants import (FUNCTIONS, TAGSOURCE, SAVEDIR, PLUGINDIR,
                        DIALOGS, MUSICLIBS, MODULES, FUNCTIONS_NO_PREVIEW)
from .puddleobjects import PuddleConfig, winsettings
from .translations import translate

NAME = 'name'
AUTHOR = 'author'
DESC = 'description'
PT_VERSION = 'puddletag_version'
VERSION = 'version'
INFO_SECTION = 'info'
MODULE_NAME = 'module'

PLUGIN_DIRS = [PLUGINDIR,
               os.path.join(os.path.dirname(__file__), 'plugins')]

PROPERTIES = [NAME, AUTHOR, DESC, PT_VERSION, VERSION]


def get_plugins(plugindir):
    if not os.path.exists(plugindir):
        os.makedirs(plugindir)
    infos = []
    for module in os.listdir(plugindir):
        info_path = os.path.join(plugindir, module, 'info')
        if not exists(info_path):
            continue
        config_data = dict(ConfigObj(info_path))
        values = [config_data.get(INFO_SECTION, {}).get(prop, '') for prop in PROPERTIES]

        if len([_f for _f in values if _f]) < len(PROPERTIES):
            continue
        d = dict(list(zip(PROPERTIES, values)))
        d[MODULE_NAME] = module
        infos.append(d)
    return infos


def load_plugins(plugins=None, parent=None):
    [sys.path.insert(0, d) for d in PLUGIN_DIRS]
    cparser = PuddleConfig()
    to_load = cparser.get('plugins', 'to_load', [])
    functions = {}
    tagsources = []
    dialogs = []
    musiclibs = []
    modules = []
    functions_no_preview = []

    join = os.path.join
    if plugins is None:
        plugins = []
        [plugins.extend(get_plugins(d)) for d in PLUGIN_DIRS]

    plugins.sort(key=lambda d: d.get(NAME, ''))

    plugin_actions = {
        'functions': functions.update,
        'functions_no_preview':  functions_no_preview.extend,
        'tagsources':  tagsources.extend,
        'dialogs':  dialogs.extend,
        'musiclibs':  musiclibs.extend
        }

    for plugin in plugins:
        if plugin[MODULE_NAME] in to_load:
            try:
                module = import_module('puddlestuff.plugins.' + plugin[MODULE_NAME])
                for attribute, action in plugin_actions.items():
                    if hasattr(module, attribute):
                        action(getattr(module, attribute))
                modules.append(module)
            except Exception as e:
                logging.exception(f"Failed to load plugin {plugin[NAME]}; error={e}")                

    for d in PLUGIN_DIRS:
        del (sys.path[0])

    return {FUNCTIONS: functions, TAGSOURCE: tagsources, DIALOGS: dialogs,
            MUSICLIBS: musiclibs, MODULES: modules, FUNCTIONS_NO_PREVIEW: functions_no_preview}


class InfoWidget(QLabel):
    def __init__(self, info=None, parent=None):
        super(InfoWidget, self).__init__(parent)
        self.setAlignment(Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignTop)
        self.setWordWrap(True)
        if info:
            self.changeInfo(info)

    def changeInfo(self, info):
        labels = [translate('Plugin Settings', 'Name'),
                  translate('Plugin Settings', 'Author'),
                  translate('Plugin Settings', 'Description'),
                  translate('Plugin Settings', 'Version')]
        properties = [NAME, AUTHOR, DESC, VERSION]

        text = '<br />'.join(['<b>%s:</b> %s' % (disp, info[prop]) for
                              disp, prop in zip(labels, properties)])
        self.setText(text)


class PluginConfig(QDialog):
    def __init__(self, parent=None):
        super(PluginConfig, self).__init__(parent)
        winsettings('pluginconfig', self)
        self._listbox = QListWidget()
        info_display = InfoWidget()

        hbox = QHBoxLayout()
        hbox.addWidget(self._listbox, 0)
        hbox.addWidget(info_display, 1)

        vbox = QVBoxLayout()
        vbox.addLayout(hbox)
        vbox.addWidget(
            QLabel(translate("Plugin Settings",
                             '<b>Loading/unloading plugins requires a restart.</b>')))
        self.setLayout(vbox)

        plugins = []
        [plugins.extend(get_plugins(d)) for d in PLUGIN_DIRS]

        cparser = PuddleConfig()
        to_load = cparser.get('plugins', 'to_load', [])
        plugins.sort(key=lambda d: d.get(NAME, ''))
        for plugin in plugins:
            item = QListWidgetItem()
            item.setText(plugin[NAME])
            if plugin[MODULE_NAME] in to_load:
                item.setCheckState(Qt.CheckState.Checked)
            else:
                item.setCheckState(Qt.CheckState.Unchecked)
            item.plugin = plugin
            self._listbox.addItem(item)

        self._listbox.currentItemChanged.connect(
            lambda item, previous: info_display.changeInfo(item.plugin))

    def get_to_load(self):
        to_load = []
        for row in range(self._listbox.count()):
            item = self._listbox.item(row)
            if item.checkState() == Qt.CheckState.Checked:
                to_load.append(item.plugin[MODULE_NAME])
        return to_load

    def applySettings(self, control=None):
        to_load = self.get_to_load()
        cparser = PuddleConfig()
        cparser.set('plugins', 'to_load', to_load)


if __name__ == '__main__':
    app = QApplication([])
    win = PluginConfig()
    win.show()
    app.exec_()