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

# Copyright (c) 2002 - 2020 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the baseclass for the various project browsers.
"""


import os

from PyQt5.QtCore import (
    QModelIndex, pyqtSignal, Qt, QCoreApplication, QItemSelectionModel,
    QItemSelection, QElapsedTimer
)
from PyQt5.QtGui import QCursor
from PyQt5.QtWidgets import (
    QTreeView, QApplication, QMenu, QDialog, QAbstractItemView
)

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox

from UI.Browser import Browser
from UI.BrowserModel import BrowserDirectoryItem, BrowserFileItem

from .ProjectBrowserModel import (
    ProjectBrowserSimpleDirectoryItem, ProjectBrowserDirectoryItem,
    ProjectBrowserFileItem
)
from .ProjectBrowserSortFilterProxyModel import (
    ProjectBrowserSortFilterProxyModel
)


class ProjectBaseBrowser(Browser):
    """
    Baseclass implementing common functionality for the various project
    browsers.
    
    @signal closeSourceWindow(str) emitted to close a source file
    """
    closeSourceWindow = pyqtSignal(str)
    
    def __init__(self, project, type_, parent=None):
        """
        Constructor
        
        @param project reference to the project object
        @param type_ project browser type (string)
        @param parent parent widget of this browser
        """
        QTreeView.__init__(self, parent)
        
        self.project = project
        
        self._model = project.getModel()
        self._sortModel = ProjectBrowserSortFilterProxyModel(type_)
        self._sortModel.setSourceModel(self._model)
        self.setModel(self._sortModel)
        
        self.selectedItemsFilter = [ProjectBrowserFileItem]
        
        # contains codes for special menu entries
        # 1 = specials for Others browser
        self.specialMenuEntries = []
        self.isTranslationsBrowser = False
        self.expandedNames = []
        
        self.SelectFlags = QItemSelectionModel.SelectionFlags(
            QItemSelectionModel.Select | QItemSelectionModel.Rows)
        self.DeselectFlags = QItemSelectionModel.SelectionFlags(
            QItemSelectionModel.Deselect | QItemSelectionModel.Rows)
        
        self._activating = False
        
        self.setContextMenuPolicy(Qt.CustomContextMenu)
        self.customContextMenuRequested.connect(self._contextMenuRequested)
        self.activated.connect(self._openItem)
        self._model.rowsInserted.connect(self.__modelRowsInserted)
        self._connectExpandedCollapsed()
        
        self._createPopupMenus()
        
        self.currentItemName = None
        
        self._init()    # perform common initialization tasks
        
        self._keyboardSearchString = ""
        self._keyboardSearchTimer = QElapsedTimer()
        self._keyboardSearchTimer.invalidate()
        
        self._initHookMethods()     # perform initialization of the hooks
        self.hooksMenuEntries = {}
        
    def _connectExpandedCollapsed(self):
        """
        Protected method to connect the expanded and collapsed signals.
        """
        self.expanded.connect(self._resizeColumns)
        self.collapsed.connect(self._resizeColumns)
        
    def _disconnectExpandedCollapsed(self):
        """
        Protected method to disconnect the expanded and collapsed signals.
        """
        self.expanded.disconnect(self._resizeColumns)
        self.collapsed.disconnect(self._resizeColumns)
        
    def _createPopupMenus(self):
        """
        Protected overloaded method to generate the popup menus.
        """
        # create the popup menu for source files
        self.sourceMenu = QMenu(self)
        self.sourceMenu.addAction(
            QCoreApplication.translate('ProjectBaseBrowser', 'Open'),
            self._openItem)
        
        # create the popup menu for general use
        self.menu = QMenu(self)
        self.menu.addAction(
            QCoreApplication.translate('ProjectBaseBrowser', 'Open'),
            self._openItem)

        # create the menu for multiple selected files
        self.multiMenu = QMenu(self)
        self.multiMenu.addAction(
            QCoreApplication.translate('ProjectBaseBrowser', 'Open'),
            self._openItem)
        
        # create the background menu
        self.backMenu = None
        
        # create the directories menu
        self.dirMenu = None
        
        # create the directory for multiple selected directories
        self.dirMultiMenu = None
        
        self.menuActions = []
        self.multiMenuActions = []
        self.dirMenuActions = []
        self.dirMultiMenuActions = []
        
        self.mainMenu = None
        
    def _contextMenuRequested(self, coord):
        """
        Protected slot to show the context menu.
        
        @param coord the position of the mouse pointer (QPoint)
        """
        if not self.project.isOpen():
            return
        
        cnt = self.getSelectedItemsCount()
        if cnt > 1:
            self.multiMenu.popup(self.mapToGlobal(coord))
        else:
            index = self.indexAt(coord)
            
            if index.isValid():
                self.menu.popup(self.mapToGlobal(coord))
            else:
                self.backMenu and self.backMenu.popup(self.mapToGlobal(coord))
        
    def _selectSingleItem(self, index):
        """
        Protected method to select a single item.
        
        @param index index of item to be selected (QModelIndex)
        """
        if index.isValid():
            self.setCurrentIndex(index)
            flags = QItemSelectionModel.SelectionFlags(
                QItemSelectionModel.ClearAndSelect | QItemSelectionModel.Rows)
            self.selectionModel().select(index, flags)
        
    def _setItemSelected(self, index, selected):
        """
        Protected method to set the selection status of an item.
        
        @param index index of item to set (QModelIndex)
        @param selected flag giving the new selection status (boolean)
        """
        if index.isValid():
            self.selectionModel().select(
                index, selected and self.SelectFlags or self.DeselectFlags)
        
    def _setItemRangeSelected(self, startIndex, endIndex, selected):
        """
        Protected method to set the selection status of a range of items.
        
        @param startIndex start index of range of items to set (QModelIndex)
        @param endIndex end index of range of items to set (QModelIndex)
        @param selected flag giving the new selection status (boolean)
        """
        selection = QItemSelection(startIndex, endIndex)
        self.selectionModel().select(
            selection, selected and self.SelectFlags or self.DeselectFlags)
        
    def __modelRowsInserted(self, parent, start, end):
        """
        Private slot called after rows have been inserted into the model.
        
        @param parent parent index of inserted rows (QModelIndex)
        @param start start row number (integer)
        @param end end row number (integer)
        """
        self._resizeColumns(parent)
        
    def _projectClosed(self):
        """
        Protected slot to handle the projectClosed signal.
        """
        self.layoutDisplay()
        if self.backMenu is not None:
            self.backMenu.setEnabled(False)
        
        self._createPopupMenus()
        
    def _projectOpened(self):
        """
        Protected slot to handle the projectOpened signal.
        """
        self.layoutDisplay()
        self.sortByColumn(0, Qt.DescendingOrder)
        self.sortByColumn(0, Qt.AscendingOrder)
        self._initMenusAndVcs()
        
    def _initMenusAndVcs(self):
        """
        Protected slot to initialize the menus and the Vcs interface.
        """
        self._createPopupMenus()
        
        if self.backMenu is not None:
            self.backMenu.setEnabled(True)
        
        if self.project.vcs is not None:
            self.vcsHelper = self.project.vcs.vcsGetProjectBrowserHelper(
                self, self.project, self.isTranslationsBrowser)
            self.vcsHelper.addVCSMenus(
                self.mainMenu, self.multiMenu, self.backMenu,
                self.dirMenu, self.dirMultiMenu)
    
    def _newProject(self):
        """
        Protected slot to handle the newProject signal.
        """
        # default to perform same actions as opening a project
        self._projectOpened()
        
    def _removeFile(self):
        """
        Protected method to remove a file or files from the project.
        """
        itmList = self.getSelectedItems()
        
        for itm in itmList[:]:
            fn = itm.fileName()
            self.closeSourceWindow.emit(fn)
            self.project.removeFile(fn)
        
    def _removeDir(self):
        """
        Protected method to remove a (single) directory from the project.
        """
        itmList = self.getSelectedItems(
            [ProjectBrowserSimpleDirectoryItem, ProjectBrowserDirectoryItem])
        for itm in itmList[:]:
            dn = itm.dirName()
            self.project.removeDirectory(dn)
        
    def _deleteDirectory(self):
        """
        Protected method to delete the selected directory from the project
        data area.
        """
        itmList = self.getSelectedItems()
        
        dirs = []
        fullNames = []
        for itm in itmList:
            dn = itm.dirName()
            fullNames.append(dn)
            dn = self.project.getRelativePath(dn)
            dirs.append(dn)
        
        from UI.DeleteFilesConfirmationDialog import (
            DeleteFilesConfirmationDialog
        )
        dlg = DeleteFilesConfirmationDialog(
            self.parent(),
            QCoreApplication.translate(
                "ProjectBaseBrowser", "Delete directories"),
            QCoreApplication.translate(
                "ProjectBaseBrowser",
                "Do you really want to delete these directories from"
                " the project?"),
            dirs)
        
        if dlg.exec_() == QDialog.Accepted:
            for dn in fullNames:
                self.project.deleteDirectory(dn)
        
    def _renameFile(self):
        """
        Protected method to rename a file of the project.
        """
        itm = self.model().item(self.currentIndex())
        fn = itm.fileName()
        self.project.renameFile(fn)
        
    def _copyToClipboard(self):
        """
        Protected method to copy the path of an entry to the clipboard.
        """
        itm = self.model().item(self.currentIndex())
        try:
            fn = itm.fileName()
        except AttributeError:
            try:
                fn = itm.dirName()
            except AttributeError:
                fn = ""
        
        cb = QApplication.clipboard()
        cb.setText(fn)
        
    def selectFile(self, fn):
        """
        Public method to highlight a node given its filename.
        
        @param fn filename of file to be highlighted (string)
        """
        newfn = os.path.abspath(fn)
        newfn = self.project.getRelativePath(newfn)
        sindex = self._model.itemIndexByName(newfn)
        if sindex.isValid():
            index = self.model().mapFromSource(sindex)
            if index.isValid():
                self._selectSingleItem(index)
                self.scrollTo(index, QAbstractItemView.PositionAtTop)
        
    def selectFileLine(self, fn, lineno):
        """
        Public method to highlight a node given its filename.
        
        @param fn filename of file to be highlighted (string)
        @param lineno one based line number of the item (integer)
        """
        newfn = os.path.abspath(fn)
        newfn = self.project.getRelativePath(newfn)
        sindex = self._model.itemIndexByNameAndLine(newfn, lineno)
        if sindex.isValid():
            index = self.model().mapFromSource(sindex)
            if index.isValid():
                self._selectSingleItem(index)
                self.scrollTo(index)
        
    def _expandAllDirs(self):
        """
        Protected slot to handle the 'Expand all directories' menu action.
        """
        self._disconnectExpandedCollapsed()
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        QApplication.processEvents()
        index = self.model().index(0, 0)
        while index.isValid():
            itm = self.model().item(index)
            if (
                isinstance(
                    itm,
                    (ProjectBrowserSimpleDirectoryItem,
                     ProjectBrowserDirectoryItem)) and
                not self.isExpanded(index)
            ):
                self.expand(index)
            index = self.indexBelow(index)
        self.layoutDisplay()
        self._connectExpandedCollapsed()
        QApplication.restoreOverrideCursor()
        
    def _collapseAllDirs(self):
        """
        Protected slot to handle the 'Collapse all directories' menu action.
        """
        self._disconnectExpandedCollapsed()
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        QApplication.processEvents()
        # step 1: find last valid index
        vindex = QModelIndex()
        index = self.model().index(0, 0)
        while index.isValid():
            vindex = index
            index = self.indexBelow(index)
        
        # step 2: go up collapsing all directory items
        index = vindex
        while index.isValid():
            itm = self.model().item(index)
            if (
                isinstance(
                    itm,
                    (ProjectBrowserSimpleDirectoryItem,
                     ProjectBrowserDirectoryItem)) and
                self.isExpanded(index)
            ):
                self.collapse(index)
            index = self.indexAbove(index)
        self.layoutDisplay()
        self._connectExpandedCollapsed()
        QApplication.restoreOverrideCursor()
        
    def _showContextMenu(self, menu):
        """
        Protected slot called before the context menu is shown.
        
        It enables/disables the VCS menu entries depending on the overall
        VCS status and the file status.
        
        @param menu reference to the menu to be shown (QMenu)
        """
        if self.project.vcs is None:
            for act in self.menuActions:
                act.setEnabled(True)
        else:
            self.vcsHelper.showContextMenu(menu, self.menuActions)
        
    def _showContextMenuMulti(self, menu):
        """
        Protected slot called before the context menu (multiple selections) is
        shown.
        
        It enables/disables the VCS menu entries depending on the overall
        VCS status and the files status.
        
        @param menu reference to the menu to be shown (QMenu)
        """
        if self.project.vcs is None:
            for act in self.multiMenuActions:
                act.setEnabled(True)
        else:
            self.vcsHelper.showContextMenuMulti(menu, self.multiMenuActions)
        
    def _showContextMenuDir(self, menu):
        """
        Protected slot called before the context menu is shown.
        
        It enables/disables the VCS menu entries depending on the overall
        VCS status and the directory status.
        
        @param menu reference to the menu to be shown (QMenu)
        """
        if self.project.vcs is None:
            for act in self.dirMenuActions:
                act.setEnabled(True)
        else:
            self.vcsHelper.showContextMenuDir(menu, self.dirMenuActions)
        
    def _showContextMenuDirMulti(self, menu):
        """
        Protected slot called before the context menu is shown.
        
        It enables/disables the VCS menu entries depending on the overall
        VCS status and the directory status.
        
        @param menu reference to the menu to be shown (QMenu)
        """
        if self.project.vcs is None:
            for act in self.dirMultiMenuActions:
                act.setEnabled(True)
        else:
            self.vcsHelper.showContextMenuDirMulti(
                menu, self.dirMultiMenuActions)
        
    def _showContextMenuBack(self, menu):
        """
        Protected slot called before the context menu is shown.
        
        @param menu reference to the menu to be shown (QMenu)
        """
        # nothing to do for now
        return
        
    def _selectEntries(self, local=True, filterList=None):
        """
        Protected method to select entries based on their VCS status.
        
        @param local flag indicating local (i.e. non VCS controlled)
            file/directory entries should be selected (boolean)
        @param filterList list of classes to check against
        """
        if self.project.vcs is None:
            return
        
        if local:
            compareString = QCoreApplication.translate(
                'ProjectBaseBrowser', "local")
        else:
            compareString = self.project.vcs.vcsName()
        
        # expand all directories in order to iterate over all entries
        self._expandAllDirs()
        
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        QApplication.processEvents()
        self.selectionModel().clear()
        QApplication.processEvents()
        
        # now iterate over all entries
        startIndex = None
        endIndex = None
        selectedEntries = 0
        index = self.model().index(0, 0)
        while index.isValid():
            itm = self.model().item(index)
            if (
                self.wantedItem(itm, filterList) and
                compareString == itm.data(1)
            ):
                if (
                    startIndex is not None and
                    startIndex.parent() != index.parent()
                ):
                    self._setItemRangeSelected(startIndex, endIndex, True)
                    startIndex = None
                selectedEntries += 1
                if startIndex is None:
                    startIndex = index
                endIndex = index
            else:
                if startIndex is not None:
                    self._setItemRangeSelected(startIndex, endIndex, True)
                    startIndex = None
            index = self.indexBelow(index)
        if startIndex is not None:
            self._setItemRangeSelected(startIndex, endIndex, True)
        QApplication.restoreOverrideCursor()
        QApplication.processEvents()
        
        if selectedEntries == 0:
            E5MessageBox.information(
                self,
                QCoreApplication.translate(
                    'ProjectBaseBrowser', "Select entries"),
                QCoreApplication.translate(
                    'ProjectBaseBrowser',
                    """There were no matching entries found."""))
        
    def selectLocalEntries(self):
        """
        Public slot to handle the select local files context menu entries.
        """
        self._selectEntries(local=True, filterList=[ProjectBrowserFileItem])
        
    def selectVCSEntries(self):
        """
        Public slot to handle the select VCS files context menu entries.
        """
        self._selectEntries(local=False, filterList=[ProjectBrowserFileItem])
        
    def selectLocalDirEntries(self):
        """
        Public slot to handle the select local directories context menu
        entries.
        """
        self._selectEntries(
            local=True,
            filterList=[ProjectBrowserSimpleDirectoryItem,
                        ProjectBrowserDirectoryItem])
        
    def selectVCSDirEntries(self):
        """
        Public slot to handle the select VCS directories context menu entries.
        """
        self._selectEntries(
            local=False,
            filterList=[ProjectBrowserSimpleDirectoryItem,
                        ProjectBrowserDirectoryItem])
        
    def getExpandedItemNames(self):
        """
        Public method to get the file/directory names of all expanded items.
        
        @return list of expanded items names (list of string)
        """
        expandedNames = []
        
        childIndex = self.model().index(0, 0)
        while childIndex.isValid():
            if self.isExpanded(childIndex):
                try:
                    expandedNames.append(
                        self.model().item(childIndex).name())
                except AttributeError:
                    # only items defining the name() method are returned
                    pass
            childIndex = self.indexBelow(childIndex)
        
        return expandedNames
        
    def expandItemsByName(self, names):
        """
        Public method to expand items given their names.
        
        @param names list of item names to be expanded (list of string)
        """
        model = self.model()
        for name in names:
            childIndex = model.index(0, 0)
            while childIndex.isValid():
                try:
                    if model.item(childIndex).name() == name:
                        self.setExpanded(childIndex, True)
                        break
                except AttributeError:
                    # ignore items not supporting this method
                    pass
                childIndex = self.indexBelow(childIndex)
        
    def _prepareRepopulateItem(self, name):
        """
        Protected slot to handle the prepareRepopulateItem signal.
        
        @param name relative name of file item to be repopulated (string)
        """
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        QApplication.processEvents()
        itm = self.currentItem()
        if itm is not None:
            self.currentItemName = itm.data(0)
        self.expandedNames = []
        sindex = self._model.itemIndexByName(name)
        if not sindex.isValid():
            return
        
        index = self.model().mapFromSource(sindex)
        if not index.isValid():
            return
        
        childIndex = self.indexBelow(index)
        while childIndex.isValid():
            if childIndex.parent() == index.parent():
                break
            if self.isExpanded(childIndex):
                self.expandedNames.append(
                    self.model().item(childIndex).data(0))
            childIndex = self.indexBelow(childIndex)
        
    def _completeRepopulateItem(self, name):
        """
        Protected slot to handle the completeRepopulateItem signal.
        
        @param name relative name of file item to be repopulated (string)
        """
        sindex = self._model.itemIndexByName(name)
        if sindex.isValid():
            index = self.model().mapFromSource(sindex)
            if index.isValid():
                if self.isExpanded(index):
                    childIndex = self.indexBelow(index)
                    while childIndex.isValid():
                        if (
                            not childIndex.isValid() or
                            childIndex.parent() == index.parent()
                        ):
                            break
                        itm = self.model().item(childIndex)
                        if itm is not None:
                            itemData = itm.data(0)
                            if (
                                self.currentItemName and
                                self.currentItemName == itemData
                            ):
                                self._selectSingleItem(childIndex)
                            if itemData in self.expandedNames:
                                self.setExpanded(childIndex, True)
                        childIndex = self.indexBelow(childIndex)
                else:
                    self._selectSingleItem(index)
                self.expandedNames = []
        self.currentItemName = None
        QApplication.restoreOverrideCursor()
        QApplication.processEvents()
        self._resort()
        
    def currentItem(self):
        """
        Public method to get a reference to the current item.
        
        @return reference to the current item
        """
        itm = self.model().item(self.currentIndex())
        return itm
    
    def _keyboardSearchType(self, item):
        """
        Protected method to check, if the item is of the correct type.
        
        @param item reference to the item
        @type BrowserItem
        @return flag indicating a correct type
        @rtype bool
        """
        return isinstance(
            item, (BrowserDirectoryItem, BrowserFileItem,
                   ProjectBrowserSimpleDirectoryItem,
                   ProjectBrowserDirectoryItem, ProjectBrowserFileItem))
    
    ###########################################################################
    ## Support for hooks below
    ###########################################################################
    
    def _initHookMethods(self):
        """
        Protected method to initialize the hooks dictionary.
        
        This method should be overridden by subclasses. All supported
        hook methods should be initialized with a None value. The keys
        must be strings.
        """
        self.hooks = {}
        
    def __checkHookKey(self, key):
        """
        Private method to check a hook key.
        
        @param key key of the hook to check (string)
        @exception KeyError raised to indicate an invalid hook
        """
        if len(self.hooks) == 0:
            raise KeyError("Hooks are not initialized.")
        
        if key not in self.hooks:
            raise KeyError(key)
        
    def addHookMethod(self, key, method):
        """
        Public method to add a hook method to the dictionary.
        
        @param key for the hook method (string)
        @param method reference to the hook method (method object)
        """
        self.__checkHookKey(key)
        self.hooks[key] = method
        
    def addHookMethodAndMenuEntry(self, key, method, menuEntry):
        """
        Public method to add a hook method to the dictionary.
        
        @param key for the hook method (string)
        @param method reference to the hook method (method object)
        @param menuEntry entry to be shown in the context menu (string)
        """
        self.addHookMethod(key, method)
        self.hooksMenuEntries[key] = menuEntry
        
    def removeHookMethod(self, key):
        """
        Public method to remove a hook method from the dictionary.
        
        @param key for the hook method (string)
        """
        self.__checkHookKey(key)
        self.hooks[key] = None
        if key in self.hooksMenuEntries:
            del self.hooksMenuEntries[key]
    
    ##################################################################
    ## Configure method below
    ##################################################################
    
    def _configure(self):
        """
        Protected method to open the configuration dialog.
        """
        e5App().getObject("UserInterface").showPreferences(
            "projectBrowserPage")
