import os
from qgis.PyQt.QtCore import QCoreApplication
from qgis.PyQt.QtWidgets import QAction, QMenu
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtWidgets import QApplication
from processing.core.ProcessingConfig import ProcessingConfig, Setting
from processing.gui.MessageDialog import MessageDialog
from processing.gui.AlgorithmDialog import AlgorithmDialog
from qgis.utils import iface
from qgis.core import QgsApplication
from processing.gui.MessageBarProgress import MessageBarProgress
from processing.gui.AlgorithmExecutor import execute
from processing.gui.Postprocessing import handleAlgorithmResults
from processing.core.Processing import Processing
from processing.tools import dataobjects

algorithmsToolbar = None
menusSettingsGroup = 'Menus'

defaultMenuEntries = {}
vectorMenu = QApplication.translate('MainWindow', 'Vect&or')
analysisToolsMenu = vectorMenu + "/" + Processing.tr('&Analysis Tools')
defaultMenuEntries.update({'qgis:distancematrix': analysisToolsMenu,
                           'qgis:sumlinelengths': analysisToolsMenu,
                           'qgis:pointsinpolygon': analysisToolsMenu,
                           'qgis:countpointsinpolygon': analysisToolsMenu,
                           'qgis:listuniquevalues': analysisToolsMenu,
                           'qgis:basicstatisticsforfields': analysisToolsMenu,
                           'qgis:nearestneighbouranalysis': analysisToolsMenu,
                           'qgis:meancoordinates': analysisToolsMenu,
                           'qgis:lineintersections': analysisToolsMenu})
researchToolsMenu = vectorMenu + "/" + Processing.tr('&Research Tools')
defaultMenuEntries.update({'qgis:randomselection': researchToolsMenu,
                           'qgis:randomselectionwithinsubsets': researchToolsMenu,
                           'qgis:randompointsinextent': researchToolsMenu,
                           'qgis:randompointsinlayerbounds': researchToolsMenu,
                           'qgis:randompointsinsidepolygonsfixed': researchToolsMenu,
                           'qgis:randompointsinsidepolygonsvariable': researchToolsMenu,
                           'qgis:regularpoints': researchToolsMenu,
                           'qgis:vectorgrid': researchToolsMenu,
                           'qgis:selectbylocation': researchToolsMenu,
                           'qgis:polygonfromlayerextent': researchToolsMenu})

geoprocessingToolsMenu = vectorMenu + "/" + Processing.tr('&Geoprocessing Tools')
defaultMenuEntries.update({'qgis:convexhull': geoprocessingToolsMenu,
                           'qgis:fixeddistancebuffer': geoprocessingToolsMenu,
                           'qgis:variabledistancebuffer': geoprocessingToolsMenu,
                           'qgis:intersection': geoprocessingToolsMenu,
                           'qgis:union': geoprocessingToolsMenu,
                           'qgis:symmetricaldifference': geoprocessingToolsMenu,
                           'qgis:clip': geoprocessingToolsMenu,
                           'qgis:difference': geoprocessingToolsMenu,
                           'qgis:dissolve': geoprocessingToolsMenu,
                           'qgis:eliminateselectedpolygons': geoprocessingToolsMenu})
geometryToolsMenu = vectorMenu + "/" + Processing.tr('G&eometry Tools')
defaultMenuEntries.update({'qgis:checkvalidity': geometryToolsMenu,
                           'qgis:exportaddgeometrycolumns': geometryToolsMenu,
                           'qgis:centroids': geometryToolsMenu,
                           'qgis:delaunaytriangulation': geometryToolsMenu,
                           'qgis:voronoipolygons': geometryToolsMenu,
                           'qgis:simplifygeometries': geometryToolsMenu,
                           'qgis:densifygeometries': geometryToolsMenu,
                           'qgis:multiparttosingleparts': geometryToolsMenu,
                           'qgis:singlepartstomultipart': geometryToolsMenu,
                           'qgis:polygonstolines': geometryToolsMenu,
                           'qgis:linestopolygons': geometryToolsMenu,
                           'qgis:extractnodes': geometryToolsMenu})
managementToolsMenu = vectorMenu + "/" + Processing.tr('&Data Management Tools')
defaultMenuEntries.update({'qgis:definecurrentprojection': managementToolsMenu,
                           'qgis:joinattributesbylocation': managementToolsMenu,
                           'qgis:splitvectorlayer': managementToolsMenu,
                           'qgis:mergevectorlayers': managementToolsMenu,
                           'qgis:createspatialindex': managementToolsMenu})

rasterMenu = Processing.tr('&Raster')
projectionsMenu = rasterMenu + "/" + Processing.tr('Projections')
defaultMenuEntries.update({'gdal:warpreproject': projectionsMenu,
                           'gdal:assignprojection': projectionsMenu,
                           'gdal:extractprojection': projectionsMenu})
conversionMenu = rasterMenu + "/" + Processing.tr('Conversion')
defaultMenuEntries.update({'gdal:rasterize': conversionMenu,
                           'gdal:rasterize_over': conversionMenu,
                           'gdal:polygonize': conversionMenu,
                           'gdal:translate': conversionMenu,
                           'gdal:rgbtopct': conversionMenu,
                           'gdal:pcttorgb': conversionMenu})
extractionMenu = rasterMenu + "/" + Processing.tr('Extraction')
defaultMenuEntries.update({'gdal:contour': extractionMenu,
                           'gdal:cliprasterbyextent': extractionMenu,
                           'gdal:cliprasterbymasklayer': extractionMenu})
analysisMenu = rasterMenu + "/" + Processing.tr('Analysis')
defaultMenuEntries.update({'gdal:sieve': analysisMenu,
                           'gdal:nearblack': analysisMenu,
                           'gdal:fillnodata': analysisMenu,
                           'gdal:proximity': analysisMenu,
                           'gdal:griddatametrics': analysisMenu,
                           'gdal:gridaverage': analysisMenu,
                           'gdal:gridinvdist': analysisMenu,
                           'gdal:gridnearestneighbor': analysisMenu,
                           'gdal:aspect': analysisMenu,
                           'gdal:hillshade': analysisMenu,
                           'gdal:roughness': analysisMenu,
                           'gdal:slope': analysisMenu,
                           'gdal:tpi': analysisMenu,
                           'gdal:tri': analysisMenu})
miscMenu = rasterMenu + "/" + Processing.tr('Miscellaneous')
defaultMenuEntries.update({'gdal:buildvirtualraster': miscMenu,
                           'gdal:merge': miscMenu,
                           'gdal:rasterinfo': miscMenu,
                           'gdal:overviews': miscMenu,
                           'gdal:tileindex': miscMenu})


def initializeMenus():
    for provider in QgsApplication.processingRegistry().providers():
        for alg in provider.algorithms():
            d = defaultMenuEntries.get(alg.id(), "")
            setting = Setting(menusSettingsGroup, "MENU_" + alg.id(),
                              "Menu path", d)
            ProcessingConfig.addSetting(setting)
            setting = Setting(menusSettingsGroup, "BUTTON_" + alg.id(),
                              "Add button", False)
            ProcessingConfig.addSetting(setting)
            setting = Setting(menusSettingsGroup, "ICON_" + alg.id(),
                              "Icon", "", valuetype=Setting.FILE)
            ProcessingConfig.addSetting(setting)

    ProcessingConfig.readSettings()


def updateMenus():
    removeMenus()
    QCoreApplication.processEvents()
    createMenus()


def createMenus():
    for alg in QgsApplication.processingRegistry().algorithms():
        menuPath = ProcessingConfig.getSetting("MENU_" + alg.id())
        addButton = ProcessingConfig.getSetting("BUTTON_" + alg.id())
        icon = ProcessingConfig.getSetting("ICON_" + alg.id())
        if icon and os.path.exists(icon):
            icon = QIcon(icon)
        else:
            icon = None
        if menuPath:
            paths = menuPath.split("/")
            addAlgorithmEntry(alg, paths[0], paths[-1], addButton=addButton, icon=icon)


def removeMenus():
    for alg in QgsApplication.processingRegistry().algorithms():
        menuPath = ProcessingConfig.getSetting("MENU_" + alg.id())
        if menuPath:
            paths = menuPath.split("/")
            removeAlgorithmEntry(alg, paths[0], paths[-1])


def addAlgorithmEntry(alg, menuName, submenuName, actionText=None, icon=None, addButton=False):
    action = QAction(icon or alg.icon(), actionText or alg.displayName(), iface.mainWindow())
    action.triggered.connect(lambda: _executeAlgorithm(alg))
    action.setObjectName("mProcessingUserMenu_%s" % alg.id())

    if menuName:
        menu = getMenu(menuName, iface.mainWindow().menuBar())
        submenu = getMenu(submenuName, menu)
        submenu.addAction(action)

    if addButton:
        global algorithmsToolbar
        if algorithmsToolbar is None:
            algorithmsToolbar = iface.addToolBar('ProcessingAlgorithms')
        algorithmsToolbar.addAction(action)


def removeAlgorithmEntry(alg, menuName, submenuName, actionText=None, delButton=True):
    if menuName:
        menu = getMenu(menuName, iface.mainWindow().menuBar())
        subMenu = getMenu(submenuName, menu)
        action = findAction(subMenu.actions(), alg, actionText)
        if action is not None:
            subMenu.removeAction(action)

        if len(subMenu.actions()) == 0:
            subMenu.deleteLater()

    if delButton:
        global algorithmsToolbar
        if algorithmsToolbar is not None:
            action = findAction(algorithmsToolbar.actions(), alg, actionText)
            if action is not None:
                algorithmsToolbar.removeAction(action)


def _executeAlgorithm(alg):
    message = alg.checkBeforeOpeningParametersDialog()
    if message:
        dlg = MessageDialog()
        dlg.setTitle(Processing.tr('Missing dependency'))
        dlg.setMessage(
            Processing.tr('<h3>Missing dependency. This algorithm cannot '
                          'be run :-( </h3>\n{0}').format(message))
        dlg.exec_()
        return

    # hack - remove when getCopy is removed
    provider = alg.provider()
    alg = alg.getCopy()
    #hack pt 2
    alg.setProvider(provider)

    context = dataobjects.createContext()
    if (alg.countVisibleParameters() + alg.getVisibleOutputsCount()) > 0:
        dlg = alg.getCustomParametersDialog()
        if not dlg:
            dlg = AlgorithmDialog(alg)
        canvas = iface.mapCanvas()
        prevMapTool = canvas.mapTool()
        dlg.show()
        dlg.exec_()
        if canvas.mapTool() != prevMapTool:
            try:
                canvas.mapTool().reset()
            except:
                pass
            canvas.setMapTool(prevMapTool)
    else:
        feedback = MessageBarProgress()
        execute(alg, context, feedback)
        handleAlgorithmResults(alg, context, feedback)
        feedback.close()


def getMenu(name, parent):
    menus = [c for c in parent.children() if isinstance(c, QMenu) and c.title() == name]
    if menus:
        return menus[0]
    else:
        return parent.addMenu(name)


def findAction(actions, alg, actionText=None):
    for action in actions:
        if action.text() in [actionText, alg.displayName(), alg.name()]:
            return action
    return None