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

"""
***************************************************************************
    ProcessingPlugin.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'

import shutil
import os
import sys
from functools import partial

from qgis.core import (QgsApplication,
                       QgsProcessingUtils,
                       QgsProcessingModelAlgorithm,
                       QgsDataItemProvider,
                       QgsDataProvider,
                       QgsDataItem,
                       QgsMapLayerType,
                       QgsMimeDataUtils)
from qgis.gui import (QgsOptionsWidgetFactory,
                      QgsCustomDropHandler)
from qgis.PyQt.QtCore import Qt, QCoreApplication, QDir, QFileInfo
from qgis.PyQt.QtWidgets import QMenu, QAction
from qgis.PyQt.QtGui import QIcon, QKeySequence
from qgis.utils import iface

from processing.core.Processing import Processing
from processing.gui.AlgorithmDialog import AlgorithmDialog
from processing.gui.ProcessingToolbox import ProcessingToolbox
from processing.gui.HistoryDialog import HistoryDialog
from processing.gui.ConfigDialog import ConfigOptionsPage
from processing.gui.ResultsDock import ResultsDock
from processing.gui.AlgorithmLocatorFilter import (AlgorithmLocatorFilter,
                                                   InPlaceAlgorithmLocatorFilter)
from processing.modeler.ModelerDialog import ModelerDialog
from processing.tools.system import tempHelpFolder
from processing.gui.menus import removeMenus, initializeMenus, createMenus, createButtons, removeButtons
from processing.core.ProcessingResults import resultsList

pluginPath = os.path.dirname(__file__)


class ProcessingOptionsFactory(QgsOptionsWidgetFactory):

    def __init__(self):
        super(QgsOptionsWidgetFactory, self).__init__()

    def icon(self):
        return QgsApplication.getThemeIcon('/processingAlgorithm.svg')

    def createWidget(self, parent):
        return ConfigOptionsPage(parent)


class ProcessingDropHandler(QgsCustomDropHandler):

    def handleFileDrop(self, file):
        if not file.lower().endswith('.model3'):
            return False
        return self.runAlg(file)

    @staticmethod
    def runAlg(file):
        alg = QgsProcessingModelAlgorithm()
        if not alg.fromFile(file):
            return False

        alg.setProvider(QgsApplication.processingRegistry().providerById('model'))
        dlg = AlgorithmDialog(alg, parent=iface.mainWindow())
        dlg.show()
        return True

    def customUriProviderKey(self):
        return 'processing'

    def handleCustomUriDrop(self, uri):
        path = uri.uri
        self.runAlg(path)


class ProcessingModelItem(QgsDataItem):

    def __init__(self, parent, name, path):
        super(ProcessingModelItem, self).__init__(QgsDataItem.Custom, parent, name, path)
        self.setState(QgsDataItem.Populated)  # no children
        self.setIconName(":/images/themes/default/processingModel.svg")
        self.setToolTip(QDir.toNativeSeparators(path))

    def hasDragEnabled(self):
        return True

    def handleDoubleClick(self):
        self.runModel()
        return True

    def mimeUri(self):
        u = QgsMimeDataUtils.Uri()
        u.layerType = "custom"
        u.providerKey = "processing"
        u.name = self.name()
        u.uri = self.path()
        return u

    def runModel(self):
        ProcessingDropHandler.runAlg(self.path())

    def editModel(self):
        dlg = ModelerDialog.create()
        dlg.loadModel(self.path())
        dlg.show()

    def actions(self, parent):
        run_model_action = QAction(QCoreApplication.translate('ProcessingPlugin', '&Run Model…'), parent)
        run_model_action.triggered.connect(self.runModel)
        edit_model_action = QAction(QCoreApplication.translate('ProcessingPlugin', '&Edit Model…'), parent)
        edit_model_action.triggered.connect(self.editModel)
        return [run_model_action, edit_model_action]


class ProcessingDataItemProvider(QgsDataItemProvider):

    def __init__(self):
        super(ProcessingDataItemProvider, self).__init__()

    def name(self):
        return 'processing'

    def capabilities(self):
        return QgsDataProvider.File

    def createDataItem(self, path, parentItem):
        file_info = QFileInfo(path)

        if file_info.suffix().lower() == 'model3':
            alg = QgsProcessingModelAlgorithm()
            if alg.fromFile(path):
                return ProcessingModelItem(parentItem, alg.name(), path)
        return None


class ProcessingPlugin:

    def __init__(self, iface):
        self.iface = iface
        self.options_factory = None
        self.drop_handler = None
        self.item_provider = None
        self.locator_filter = None
        self.edit_features_locator_filter = None
        self.initialized = False
        self.initProcessing()

    def initProcessing(self):
        if not self.initialized:
            self.initialized = True
            Processing.initialize()

    def initGui(self):
        self.options_factory = ProcessingOptionsFactory()
        self.options_factory.setTitle(self.tr('Processing'))
        iface.registerOptionsWidgetFactory(self.options_factory)
        self.drop_handler = ProcessingDropHandler()
        iface.registerCustomDropHandler(self.drop_handler)
        self.item_provider = ProcessingDataItemProvider()
        QgsApplication.dataItemProviderRegistry().addProvider(self.item_provider)
        self.locator_filter = AlgorithmLocatorFilter()
        iface.registerLocatorFilter(self.locator_filter)
        # Invalidate the locator filter for in-place when active layer changes
        iface.currentLayerChanged.connect(lambda _: self.iface.invalidateLocatorResults())
        self.edit_features_locator_filter = InPlaceAlgorithmLocatorFilter()
        iface.registerLocatorFilter(self.edit_features_locator_filter)

        self.toolbox = ProcessingToolbox()
        self.iface.addDockWidget(Qt.RightDockWidgetArea, self.toolbox)
        self.toolbox.hide()
        self.toolbox.visibilityChanged.connect(self.toolboxVisibilityChanged)

        self.resultsDock = ResultsDock()
        self.iface.addDockWidget(Qt.RightDockWidgetArea, self.resultsDock)
        self.resultsDock.hide()

        self.menu = QMenu(self.iface.mainWindow().menuBar())
        self.menu.setObjectName('processing')
        self.menu.setTitle(self.tr('Pro&cessing'))

        self.toolboxAction = QAction(self.tr('&Toolbox'), self.iface.mainWindow())
        self.toolboxAction.setCheckable(True)
        self.toolboxAction.setObjectName('toolboxAction')
        self.toolboxAction.setIcon(
            QgsApplication.getThemeIcon("/processingAlgorithm.svg"))
        self.iface.registerMainWindowAction(self.toolboxAction,
                                            QKeySequence('Ctrl+Alt+T').toString(QKeySequence.NativeText))
        self.toolboxAction.toggled.connect(self.openToolbox)
        self.iface.attributesToolBar().insertAction(self.iface.actionOpenStatisticalSummary(), self.toolboxAction)
        self.menu.addAction(self.toolboxAction)

        self.modelerAction = QAction(
            QgsApplication.getThemeIcon("/processingModel.svg"),
            QCoreApplication.translate('ProcessingPlugin', '&Graphical Modeler…'), self.iface.mainWindow())
        self.modelerAction.setObjectName('modelerAction')
        self.modelerAction.triggered.connect(self.openModeler)
        self.iface.registerMainWindowAction(self.modelerAction,
                                            QKeySequence('Ctrl+Alt+G').toString(QKeySequence.NativeText))
        self.menu.addAction(self.modelerAction)

        self.historyAction = QAction(
            QgsApplication.getThemeIcon("/mIconHistory.svg"),
            QCoreApplication.translate('ProcessingPlugin', '&History…'), self.iface.mainWindow())
        self.historyAction.setObjectName('historyAction')
        self.historyAction.triggered.connect(self.openHistory)
        self.iface.registerMainWindowAction(self.historyAction,
                                            QKeySequence('Ctrl+Alt+H').toString(QKeySequence.NativeText))
        self.menu.addAction(self.historyAction)
        self.toolbox.processingToolbar.addAction(self.historyAction)

        self.resultsAction = QAction(
            QgsApplication.getThemeIcon("/processingResult.svg"),
            self.tr('&Results Viewer'), self.iface.mainWindow())
        self.resultsAction.setObjectName('resultsViewer')
        self.resultsAction.setCheckable(True)
        self.iface.registerMainWindowAction(self.resultsAction,
                                            QKeySequence('Ctrl+Alt+R').toString(QKeySequence.NativeText))

        self.menu.addAction(self.resultsAction)
        self.toolbox.processingToolbar.addAction(self.resultsAction)
        self.resultsDock.visibilityChanged.connect(self.resultsAction.setChecked)
        self.resultsAction.toggled.connect(self.resultsDock.setUserVisible)

        self.toolbox.processingToolbar.addSeparator()

        self.editInPlaceAction = QAction(
            QgsApplication.getThemeIcon("/mActionProcessSelected.svg"),
            self.tr('Edit Features In-Place'), self.iface.mainWindow())
        self.editInPlaceAction.setObjectName('editInPlaceFeatures')
        self.editInPlaceAction.setCheckable(True)
        self.editInPlaceAction.toggled.connect(self.editSelected)
        self.menu.addAction(self.editInPlaceAction)
        self.toolbox.processingToolbar.addAction(self.editInPlaceAction)

        self.toolbox.processingToolbar.addSeparator()

        self.optionsAction = QAction(
            QgsApplication.getThemeIcon("/mActionOptions.svg"),
            self.tr('Options'), self.iface.mainWindow())
        self.optionsAction.setObjectName('optionsAction')
        self.optionsAction.triggered.connect(self.openProcessingOptions)
        self.toolbox.processingToolbar.addAction(self.optionsAction)

        menuBar = self.iface.mainWindow().menuBar()
        menuBar.insertMenu(
            self.iface.firstRightStandardMenu().menuAction(), self.menu)

        self.menu.addSeparator()

        initializeMenus()
        createMenus()
        createButtons()

        # In-place editing button state sync
        self.iface.currentLayerChanged.connect(self.sync_in_place_button_state)
        self.iface.mapCanvas().selectionChanged.connect(self.sync_in_place_button_state)
        self.iface.actionToggleEditing().triggered.connect(partial(self.sync_in_place_button_state, None))
        self.sync_in_place_button_state()

    def sync_in_place_button_state(self, layer=None):
        """Synchronise the button state with layer state"""

        if layer is None:
            layer = self.iface.activeLayer()

        old_enabled_state = self.editInPlaceAction.isEnabled()

        new_enabled_state = layer is not None and layer.type() == QgsMapLayerType.VectorLayer
        self.editInPlaceAction.setEnabled(new_enabled_state)

        if new_enabled_state != old_enabled_state:
            self.toolbox.set_in_place_edit_mode(new_enabled_state and self.editInPlaceAction.isChecked())

    def openProcessingOptions(self):
        self.iface.showOptionsDialog(self.iface.mainWindow(), currentPage='processingOptions')

    def unload(self):
        self.toolbox.setVisible(False)
        self.iface.removeDockWidget(self.toolbox)
        self.iface.attributesToolBar().removeAction(self.toolboxAction)

        self.resultsDock.setVisible(False)
        self.iface.removeDockWidget(self.resultsDock)

        self.toolbox.deleteLater()
        self.menu.deleteLater()

        # also delete temporary help files
        folder = tempHelpFolder()
        if QDir(folder).exists():
            shutil.rmtree(folder, True)

        self.iface.unregisterMainWindowAction(self.toolboxAction)
        self.iface.unregisterMainWindowAction(self.modelerAction)
        self.iface.unregisterMainWindowAction(self.historyAction)
        self.iface.unregisterMainWindowAction(self.resultsAction)

        self.iface.unregisterOptionsWidgetFactory(self.options_factory)
        self.iface.deregisterLocatorFilter(self.locator_filter)
        self.iface.deregisterLocatorFilter(self.edit_features_locator_filter)
        self.iface.unregisterCustomDropHandler(self.drop_handler)
        QgsApplication.dataItemProviderRegistry().removeProvider(self.item_provider)

        removeButtons()
        removeMenus()
        Processing.deinitialize()

    def openToolbox(self, show):
        self.toolbox.setUserVisible(show)

    def toolboxVisibilityChanged(self, visible):
        self.toolboxAction.setChecked(visible)

    def openModeler(self):
        dlg = ModelerDialog.create()
        dlg.update_model.connect(self.updateModel)
        dlg.show()

    def updateModel(self):
        model_provider = QgsApplication.processingRegistry().providerById('model')
        model_provider.refreshAlgorithms()

    def openResults(self):
        if self.resultsDock.isVisible():
            self.resultsDock.hide()
        else:
            self.resultsDock.show()

    def openHistory(self):
        dlg = HistoryDialog()
        dlg.exec_()

    def tr(self, message):
        return QCoreApplication.translate('ProcessingPlugin', message)

    def editSelected(self, enabled):
        self.toolbox.set_in_place_edit_mode(enabled)
