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

"""
***************************************************************************
    ProcessingToolbox.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

from PyQt4 import uic
from PyQt4.QtCore import Qt, QSettings, QCoreApplication
from PyQt4.QtGui import QMenu, QAction, QTreeWidgetItem
from qgis.utils import iface

from processing.modeler.ModelerUtils import ModelerUtils
from processing.core.Processing import Processing
from processing.core.ProcessingLog import ProcessingLog
from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.gui.MessageDialog import MessageDialog
from processing.gui import AlgorithmClassification
from processing.gui.AlgorithmDialog import AlgorithmDialog
from processing.gui.BatchAlgorithmDialog import BatchAlgorithmDialog
from processing.gui.EditRenderingStylesDialog import EditRenderingStylesDialog

pluginPath = os.path.split(os.path.dirname(__file__))[0]
WIDGET, BASE = uic.loadUiType(
    os.path.join(pluginPath, 'ui', 'ProcessingToolbox.ui'))


class ProcessingToolbox(BASE, WIDGET):

    USE_CATEGORIES = '/Processing/UseSimplifiedInterface'

    updateAlgList = True

    def __init__(self):
        super(ProcessingToolbox, self).__init__(None)
        self.setupUi(self)
        self.setAllowedAreas(Qt.LeftDockWidgetArea | Qt.RightDockWidgetArea)

        self.modeComboBox.clear()
        self.modeComboBox.addItems([self.tr('Simplified interface'),
                                   self.tr('Advanced interface')])
        settings = QSettings()
        if not settings.contains(self.USE_CATEGORIES):
            settings.setValue(self.USE_CATEGORIES, True)
        useCategories = settings.value(self.USE_CATEGORIES, type=bool)
        if useCategories:
            self.modeComboBox.setCurrentIndex(0)
        else:
            self.modeComboBox.setCurrentIndex(1)
        self.modeComboBox.currentIndexChanged.connect(self.modeHasChanged)

        self.searchBox.textChanged.connect(self.textChanged)
        self.algorithmTree.customContextMenuRequested.connect(
            self.showPopupMenu)
        self.algorithmTree.doubleClicked.connect(self.executeAlgorithm)

        if hasattr(self.searchBox, 'setPlaceholderText'):
            self.searchBox.setPlaceholderText(self.tr('Search...'))

        self.fillTree()

    def textChanged(self):
        text = self.searchBox.text().strip(' ').lower()
        self._filterItem(self.algorithmTree.invisibleRootItem(), text)
        if text:
            self.algorithmTree.expandAll()
        else:
            self.algorithmTree.collapseAll()
            self.algorithmTree.invisibleRootItem().child(0).setExpanded(True)

    def _filterItem(self, item, text):
        if (item.childCount() > 0):
            show = False
            for i in xrange(item.childCount()):
                child = item.child(i)
                showChild = self._filterItem(child, text)
                show = showChild or show
            item.setHidden(not show)
            return show
        elif isinstance(item, (TreeAlgorithmItem, TreeActionItem)):
            hide = bool(text) and (text not in item.text(0).lower())
            item.setHidden(hide)
            return not hide
        else:
            item.setHidden(True)
            return False

    def modeHasChanged(self):
        idx = self.modeComboBox.currentIndex()
        settings = QSettings()
        if idx == 0:
            # Simplified
            settings.setValue(self.USE_CATEGORIES, True)
        else:
            settings.setValue(self.USE_CATEGORIES, False)

        self.fillTree()

    def algsListHasChanged(self):
        if self.updateAlgList:
            self.fillTree()

    def updateProvider(self, providerName, updateAlgsList=True):
        if updateAlgsList:
            self.updateAlgList = False
            Processing.updateAlgsList()
            self.updateAlgList = True
        for i in xrange(self.algorithmTree.invisibleRootItem().childCount()):
            child = self.algorithmTree.invisibleRootItem().child(i)
            if isinstance(child, TreeProviderItem):
                if child.providerName == providerName:
                    child.refresh()
                    # sort categories and items in categories
                    child.sortChildren(0, Qt.AscendingOrder)
                    for i in xrange(child.childCount()):
                        child.child(i).sortChildren(0, Qt.AscendingOrder)
                    break
        self.addRecentAlgorithms(True)

    def showPopupMenu(self, point):
        item = self.algorithmTree.itemAt(point)
        if isinstance(item, TreeAlgorithmItem):
            alg = item.alg
            popupmenu = QMenu()
            executeAction = QAction(self.tr('Execute'), self.algorithmTree)
            executeAction.triggered.connect(self.executeAlgorithm)
            popupmenu.addAction(executeAction)
            if alg.canRunInBatchMode and not alg.allowOnlyOpenedLayers:
                executeBatchAction = QAction(
                    self.tr('Execute as batch process'),
                    self.algorithmTree)
                executeBatchAction.triggered.connect(
                    self.executeAlgorithmAsBatchProcess)
                popupmenu.addAction(executeBatchAction)
            popupmenu.addSeparator()
            editRenderingStylesAction = QAction(
                self.tr('Edit rendering styles for outputs'),
                self.algorithmTree)
            editRenderingStylesAction.triggered.connect(
                self.editRenderingStyles)
            popupmenu.addAction(editRenderingStylesAction)
            actions = Processing.contextMenuActions
            if len(actions) > 0:
                popupmenu.addSeparator()
            for action in actions:
                action.setData(alg, self)
                if action.isEnabled():
                    contextMenuAction = QAction(action.name,
                                                self.algorithmTree)
                    contextMenuAction.triggered.connect(action.execute)
                    popupmenu.addAction(contextMenuAction)

            popupmenu.exec_(self.algorithmTree.mapToGlobal(point))

    def editRenderingStyles(self):
        item = self.algorithmTree.currentItem()
        if isinstance(item, TreeAlgorithmItem):
            alg = Processing.getAlgorithm(item.alg.commandLineName())
            dlg = EditRenderingStylesDialog(alg)
            dlg.exec_()

    def executeAlgorithmAsBatchProcess(self):
        item = self.algorithmTree.currentItem()
        if isinstance(item, TreeAlgorithmItem):
            alg = Processing.getAlgorithm(item.alg.commandLineName())
            alg = alg.getCopy()
            dlg = BatchAlgorithmDialog(alg)
            dlg.show()
            dlg.exec_()

    def executeAlgorithm(self):
        item = self.algorithmTree.currentItem()
        if isinstance(item, TreeAlgorithmItem):
            alg = Processing.getAlgorithm(item.alg.commandLineName())
            message = alg.checkBeforeOpeningParametersDialog()
            if message:
                dlg = MessageDialog()
                dlg.setTitle(self.tr('Missing dependency'))
                dlg.setMessage(
                    self.tr('<h3>Missing dependency. This algorithm cannot '
                            'be run :-( </h3>\n%s') % message)
                dlg.exec_()
                return
            alg = alg.getCopy()
            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)
            if dlg.executed:
                showRecent = ProcessingConfig.getSetting(
                    ProcessingConfig.SHOW_RECENT_ALGORITHMS)
                if showRecent:
                    self.addRecentAlgorithms(True)
        if isinstance(item, TreeActionItem):
            action = item.action
            action.setData(self)
            action.execute()

    def fillTree(self):
        settings = QSettings()
        useCategories = settings.value(self.USE_CATEGORIES, type=bool)
        if useCategories:
            self.fillTreeUsingCategories()
        else:
            self.fillTreeUsingProviders()
        self.algorithmTree.sortItems(0, Qt.AscendingOrder)
        self.addRecentAlgorithms(False)

    def addRecentAlgorithms(self, updating):
        showRecent = ProcessingConfig.getSetting(
            ProcessingConfig.SHOW_RECENT_ALGORITHMS)
        if showRecent:
            recent = ProcessingLog.getRecentAlgorithms()
            if len(recent) != 0:
                found = False
                if updating:
                    recentItem = self.algorithmTree.topLevelItem(0)
                    treeWidget = recentItem.treeWidget()
                    treeWidget.takeTopLevelItem(
                        treeWidget.indexOfTopLevelItem(recentItem))

                recentItem = QTreeWidgetItem()
                recentItem.setText(0, self.tr('Recently used algorithms'))
                for algname in recent:
                    alg = Processing.getAlgorithm(algname)
                    if alg is not None:
                        algItem = TreeAlgorithmItem(alg)
                        recentItem.addChild(algItem)
                        found = True
                if found:
                    self.algorithmTree.insertTopLevelItem(0, recentItem)
                    recentItem.setExpanded(True)

            self.algorithmTree.setWordWrap(True)

    def fillTreeUsingCategories(self):
        providersToExclude = ['model', 'script']
        self.algorithmTree.clear()
        text = unicode(self.searchBox.text())
        groups = {}
        for providerName in Processing.algs.keys():
            provider = Processing.algs[providerName]
            name = 'ACTIVATE_' + providerName.upper().replace(' ', '_')
            if not ProcessingConfig.getSetting(name):
                continue
            if providerName in providersToExclude or \
                    len(ModelerUtils.providers[providerName].actions) != 0:
                continue
            algs = provider.values()

            # add algorithms

            for alg in algs:
                if not alg.showInToolbox:
                    continue
                altgroup, altsubgroup = AlgorithmClassification.getClassification(alg)
                if altgroup is None:
                    continue
                algName = AlgorithmClassification.getDisplayName(alg)
                if text == '' or text.lower() in algName.lower():
                    if altgroup not in groups:
                        groups[altgroup] = {}
                    group = groups[altgroup]
                    if altsubgroup not in group:
                        groups[altgroup][altsubgroup] = []
                    subgroup = groups[altgroup][altsubgroup]
                    subgroup.append(alg)

        if len(groups) > 0:
            mainItem = QTreeWidgetItem()
            mainItem.setText(0, 'Geoalgorithms')
            mainItem.setIcon(0, GeoAlgorithm.getDefaultIcon())
            mainItem.setToolTip(0, mainItem.text(0))
            for (groupname, group) in groups.items():
                groupItem = QTreeWidgetItem()
                groupItem.setText(0, groupname)
                groupItem.setIcon(0, GeoAlgorithm.getDefaultIcon())
                groupItem.setToolTip(0, groupItem.text(0))
                mainItem.addChild(groupItem)
                for (subgroupname, subgroup) in group.items():
                    subgroupItem = QTreeWidgetItem()
                    subgroupItem.setText(0, subgroupname)
                    subgroupItem.setIcon(0, GeoAlgorithm.getDefaultIcon())
                    subgroupItem.setToolTip(0, subgroupItem.text(0))
                    groupItem.addChild(subgroupItem)
                    for alg in subgroup:
                        algItem = TreeAlgorithmItem(alg)
                        subgroupItem.addChild(algItem)

            self.algorithmTree.addTopLevelItem(mainItem)

        for providerName in Processing.algs.keys():
            if providerName not in providersToExclude:
                continue
            name = 'ACTIVATE_' + providerName.upper().replace(' ', '_')
            if not ProcessingConfig.getSetting(name):
                continue
            providerItem = TreeProviderItem(providerName)
            self.algorithmTree.addTopLevelItem(providerItem)

    def fillTreeUsingProviders(self):
        self.algorithmTree.clear()
        for providerName in Processing.algs.keys():
            name = 'ACTIVATE_' + providerName.upper().replace(' ', '_')
            if not ProcessingConfig.getSetting(name):
                continue
            providerItem = TreeProviderItem(providerName)
            self.algorithmTree.addTopLevelItem(providerItem)
            providerItem.setHidden(providerItem.childCount() == 0)


class TreeAlgorithmItem(QTreeWidgetItem):

    def __init__(self, alg):
        settings = QSettings()
        useCategories = settings.value(ProcessingToolbox.USE_CATEGORIES,
                                       type=bool)
        QTreeWidgetItem.__init__(self)
        self.alg = alg
        icon = alg.getIcon()
        if useCategories:
            icon = GeoAlgorithm.getDefaultIcon()
        name = AlgorithmClassification.getDisplayName(alg)
        self.setIcon(0, icon)
        self.setToolTip(0, name)
        self.setText(0, name)


class TreeActionItem(QTreeWidgetItem):

    def __init__(self, action):
        QTreeWidgetItem.__init__(self)
        self.action = action
        self.setText(0, action.name)
        self.setIcon(0, action.getIcon())


class TreeProviderItem(QTreeWidgetItem):

    def __init__(self, providerName):
        QTreeWidgetItem.__init__(self)
        self.providerName = providerName
        self.provider = Processing.getProviderFromName(providerName)
        self.setIcon(0, self.provider.getIcon())
        self.populate()

    def refresh(self):
        self.takeChildren()
        self.populate()

    def populate(self):
        groups = {}
        count = 0
        provider = Processing.algs[self.providerName]
        algs = provider.values()

        # Add algorithms
        for alg in algs:
            if not alg.showInToolbox:
                continue
            if alg.group in groups:
                groupItem = groups[alg.group]
            else:
                groupItem = QTreeWidgetItem()
                name = alg.i18n_group or alg.group
                groupItem.setText(0, name)
                groupItem.setToolTip(0, name)
                groups[alg.group] = groupItem
            algItem = TreeAlgorithmItem(alg)
            groupItem.addChild(algItem)
            count += 1

        actions = Processing.actions[self.providerName]
        for action in actions:
            if action.group in groups:
                groupItem = groups[action.group]
            else:
                groupItem = QTreeWidgetItem()
                groupItem.setText(0, action.group)
                groups[action.group] = groupItem
            algItem = TreeActionItem(action)
            groupItem.addChild(algItem)

        self.setText(0, self.provider.getDescription()
                     + QCoreApplication.translate("TreeProviderItem", " [{0} geoalgorithms]").format(count))
        self.setToolTip(0, self.text(0))
        for groupItem in groups.values():
            self.addChild(groupItem)
