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

"""
***************************************************************************
    __main__
    ---------------------
    Date                 : August 2017
    Copyright            : (C) 2017 by Benjamin Jakimow
    Email                : benjamin.jakimow@geo.hu-berlin.de
***************************************************************************
*                                                                         *
*   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.                                   *
*                                                                         *
***************************************************************************
"""

import os
import pathlib
import site

import qgis
from enmapbox import __version__
from qgis.PyQt.QtGui import QIcon
from qgis.core import QgsProcessingProvider, QgsProcessingAlgorithm, QgsApplication, QgsRuntimeProfiler

try:
    from processing.core.ProcessingConfig import ProcessingConfig, Setting
except ModuleNotFoundError:
    path = pathlib.Path(qgis.__file__)
    pathPlugins = os.path.abspath(path / '../../plugins')
    site.addsitedir(pathPlugins)
    from processing.core.ProcessingConfig import ProcessingConfig, Setting

ID = 'enmapbox'
NAME = 'EnMAP-Box'
LONG_NAME = 'EnMAP-Box (build {})'.format(__version__)


class EnMAPBoxProcessingProviderKeys(object):
    ACTIVATE = 'ENMAPBOX_ACTIVATE'
    OUTPUTFOLDER = 'ENMAPBOX_OUTPUTFOLDER'


class EnMAPBoxProcessingProvider(QgsProcessingProvider):
    """
    The EnMAPBoxAlgorithmProvider contains the GeoAlgorithms under the umbrella of the EnMAP-Box.
    It enhances the "standard" processing.core.AlgorithmProvider by functionality to add and remove
    GeoAlgorithms during runtime.
    """

    _ENMAPBOX_PROCESSING_PROVIDER = None

    @staticmethod
    def instance() -> 'EnMAPBoxProcessingProvider':

        if EnMAPBoxProcessingProvider._ENMAPBOX_PROCESSING_PROVIDER is None:
            EnMAPBoxProcessingProvider._ENMAPBOX_PROCESSING_PROVIDER = EnMAPBoxProcessingProvider()
        return EnMAPBoxProcessingProvider._ENMAPBOX_PROCESSING_PROVIDER

    def __init__(self):
        super(EnMAPBoxProcessingProvider, self).__init__()
        # internal list of GeoAlgorithms. Is used on re-loads and can be manipulated
        self.mAlgorithms = []
        self.mSettingsPrefix = self.id().upper().replace(' ', '_')

        # try:
        #    import _classic.hubflow.signals
        #    _classic.hubflow.signals.sigFileCreated.connect(self.onHubFlowFileCreated)
        # except Exception as ex:
        #    messageLog(ex)

    def load(self):
        with QgsRuntimeProfiler.profile('OTB Provider'):
            group = self.name()
            ProcessingConfig.settingIcons[group] = self.icon()
            ProcessingConfig.addSetting(
                Setting(group, EnMAPBoxProcessingProviderKeys.ACTIVATE, self.tr('Activate'), True))
            ProcessingConfig.addSetting(Setting(group, EnMAPBoxProcessingProviderKeys.OUTPUTFOLDER,
                                                self.tr("EnMAP-Box output folder"),
                                                (pathlib.Path('~').expanduser() / 'enmapboxoutputs').as_posix(),
                                                ))

            # todo: add more settings
            ProcessingConfig.readSettings()
            self.refreshAlgorithms()

        return True

    # def unload(self):
    #    ProcessingConfig.removeSetting(EnMAPBoxProcessingProviderKeys.ACTIVATE)
    #    ProcessingConfig.removeSetting(EnMAPBoxProcessingProviderKeys.OUTPUTFOLDER)

    def isActive(self):
        return ProcessingConfig.getSetting(EnMAPBoxProcessingProviderKeys.ACTIVATE)

    def setActive(self, active):
        ProcessingConfig.setSettingValue(EnMAPBoxProcessingProviderKeys.ACTIVATE, active)

    def onHubFlowFileCreated(self, file):
        """
        Add file created  by hubflow to the EnMAP-Box
        :return:
        """
        from enmapbox import debugLog
        from enmapbox.gui.enmapboxgui import EnMAPBox

        debugLog(f'onHubFlowFileCreated: file: {file}')
        if EnMAPBox is not None:
            emb = EnMAPBox.instance()
            if isinstance(emb, EnMAPBox):
                emb.addSource(file)
        else:
            debugLog(f'onHubFlowFileCreated: no EnMAP-Box instance found: {file}')

    def initializeSettings(self):
        """This is the place where you should add config parameters
        using the ProcessingConfig class.

        This method is called when a provider is added to the
        Processing framework. By default it just adds a setting to
        activate or deactivate algorithms from the provider.
        """

        ProcessingConfig.setGroupIcon(self.name(), self.icon())
        ProcessingConfig.addSetting(Setting(self.name(), self.mSettingsPrefix + '_ACTIVATE',
                                            self.tr('Activates the EnMAP-Box'), True))
        ProcessingConfig.addSetting(
            Setting(self.name(), self.mSettingsPrefix + '_HELPPATH', 'Location of EnMAP-Box docs', 'default'))
        ProcessingConfig.readSettings()

    def emitUpdated(self):
        """
        Will inform the ProcessingConfig that Provider settings have been changed.
        """
        # import processing.core.ProcessingConfig
        # processing.core.ProcessingConfig.settingsWatcher.settingsChanged.emit()
        self.algorithmsLoaded.emit()

    def id(self) -> str:
        """
        :return:
        """
        return ID

    def helpid(self) -> str:
        return 'https://enmap-box.readthedocs.io/en/latest/'

    def icon(self) -> QIcon:
        """
        Returns the EnMAPBox icon
        :return: QIcon
        """
        return QIcon(':/enmapbox/gui/ui/icons/enmapbox.svg')

    def name(self) -> str:
        """
        :return: str
        """
        return NAME

    def longName(self) -> str:
        """
        :return: str
        """
        return LONG_NAME

    def defaultRasterFileExtension(self) -> str:
        """
        :return: 'tif'
        """
        return 'tif'

    def defaultVectorFileExtension(self, hasGeometry: bool = True) -> str:
        """
        :return: 'gpkg'
        """
        return 'gpkg'

    def supportedOutputRasterLayerExtensions(self) -> list:
        return ['tif', 'bsq', 'bil', 'bip', 'vrt']

    def supportsNonFileBasedOutput(self) -> bool:
        return False

    def containsAlgorithm(self, algorithm: QgsProcessingAlgorithm) -> bool:
        """
        Returns True if an algorithm with same name is already added.
        :param algorithm:
        :return:
        """
        for a in self.algorithms():
            if a.name() == algorithm.name():
                return True
        return False

    def unload(self):
        """
        This method is called when you remove the provider from
        Processing. Removal of config setting should be done here.
        """
        for key in list(ProcessingConfig.settings.keys()):
            if key.startswith(self.mSettingsPrefix):
                ProcessingConfig.removeSetting(key)
        # del ProcessingConfig.settingIcons[self.name()]
        # ProcessingConfig.removeSetting(GdalUtils.GDAL_HELP_PATH)

    # def setActive(self, active):
    #    ProcessingConfig.setSettingValue(self.mSettingsPrefix, active)

    def addAlgorithm(self, algorithm: QgsProcessingAlgorithm, _emitUpdated=True):
        """
        Adds a QgsProcessingAlgorithm to the EnMAPBoxAlgorithmProvider
        :param algorithm: QgsProcessingAlgorithm
        :param _emitUpdated: bool, True by default. set on False to not call .emitUpdated() automatically
        :return:
        """

        super(EnMAPBoxProcessingProvider, self).addAlgorithm(algorithm)
        self.mAlgorithms.append(algorithm)
        if _emitUpdated:
            self.emitUpdated()

    def addAlgorithms(self, algorithmns: list):
        """
        Adds a list of QgsProcessingAlgorithms. The self.emitUpdated() signal is called 1x afterwards.
        """
        for a in algorithmns:
            self.addAlgorithm(a.createInstance(), _emitUpdated=False)
        if len(algorithmns) > 0:
            self.emitUpdated()
        # self.refreshAlgorithms()

    def removeAlgorithm(self, algorithm: QgsProcessingAlgorithm):
        """
        Removes a single QgsProcessingAlgorithms
        :param algorithm: QgsProcessingAlgorithm
        """
        self.removeAlgorithms([algorithm])

    def removeAlgorithms(self, algorithms: list):
        """
        Removes a list of QgsProcessingAlgorithms
        :param algorithms: [list-of-QgsProcessingAlgorithms]
        """
        if isinstance(algorithms, QgsProcessingAlgorithm):
            algorithms = [algorithms]

        for a in algorithms:
            if a in self.mAlgorithms:
                self.mAlgorithms.remove(a)
        # self.refreshAlgorithms()

    def refreshAlgorithms(self, *args, **kwargs):

        copies = [a.create() for a in self.algorithms()]
        self.removeAlgorithms(self.algorithms())
        super(EnMAPBoxProcessingProvider, self).refreshAlgorithms()
        self.addAlgorithms(copies)

    def loadAlgorithms(self):
        """
        Loads all algorithms belonging to this provider.
        """
        for alg in self.mAlgorithms:
            alg.provider = self
        self.addAlgorithms(self.mAlgorithms)


def instance() -> EnMAPBoxProcessingProvider:
    """
    Returns the EnMAPBoxAlgorithmProvider instance registered to QgsProcessingRegistry
    :return:
    """
    return QgsApplication.instance().processingRegistry().providerById(ID)
