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

# Copyright (c) 2008 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a toolbar manager class.
"""

from __future__ import unicode_literals

from PyQt5.QtCore import QObject, QByteArray, QDataStream, QIODevice
from PyQt5.QtWidgets import QToolBar

import Utilities


class E5ToolBarManager(QObject):
    """
    Class implementing a toolbar manager.
    """
    VersionMarker = 0xffff
    ToolBarMarker = 0xfefe
    CustomToolBarMarker = 0xfdfd
    
    def __init__(self, ui=None, parent=None):
        """
        Constructor
        
        @param ui reference to the user interface object (UI.UserInterface)
        @param parent reference to the parent object (QObject)
        """
        super(E5ToolBarManager, self).__init__(parent)
        
        self.__mainWindow = None
        self.__ui = ui
        
        self.__toolBars = {}
        # maps toolbar IDs to actions
        self.__toolBarsWithSeparators = {}
        # maps toolbar IDs to actions incl. separators
        self.__defaultToolBars = {}
        # maps default toolbar IDs to actions
        self.__customToolBars = []
        # list of custom toolbars
        self.__allToolBars = {}
        # maps toolbar IDs to toolbars
        
        self.__categoryToActions = {}
        # maps categories to actions
        self.__actionToCategory = {}
        # maps action IDs to categories
        self.__allActions = {}
        # maps action IDs to actions
        self.__actionToToolBars = {}
        # maps action IDs to toolbars
        
        self.__widgetActions = {}
        # maps widget action IDs to toolbars
        self.__allWidgetActions = {}
        # maps widget action IDs to widget actions
    
    ######################################################
    ## Private methods
    ######################################################
    
    def __toolBarByName(self, name):
        """
        Private slot to get a toolbar by its object name.
        
        @param name object name of the toolbar (string)
        @return reference to the toolbar (QToolBar)
        """
        for toolBar in list(self.__allToolBars.values()):
            if toolBar.objectName() == name:
                return toolBar
        return None
    
    def __findAction(self, name):
        """
        Private method to find an action by name.
        
        @param name name of the action to search for (string)
        @return reference to the action (QAction)
        """
        # check objectName() first
        for action in list(self.__allActions.values()):
            if action.objectName() == name:
                return action
        
        # check text() next
        for action in list(self.__allActions.values()):
            if action.text() == name:
                return action
        
        return None
    
    def __findDefaultToolBar(self, name):
        """
        Private method to find a default toolbar by name.
        
        @param name name of the default toolbar to search for (string)
        @return reference to the default toolbar (QToolBar)
        """
        # check objectName() first
        for tbID in self.__defaultToolBars:
            tb = self.__allToolBars[tbID]
            if tb.objectName() == name:
                return tb
        
        # check windowTitle() next
        for tbID in self.__defaultToolBars:
            tb = self.__allToolBars[tbID]
            if tb.windowTitle() == name:
                return tb
        
        return None
    
    ######################################################
    ## Public methods
    ######################################################
    
    def setMainWindow(self, mainWindow):
        """
        Public method to set the reference to the main window.
        
        @param mainWindow reference to the main window (QMainWindow)
        """
        self.__mainWindow = mainWindow
    
    def mainWindow(self):
        """
        Public method to get the reference to the main window.
        
        @return reference to the main window (QMainWindow)
        """
        return self.__mainWindow
    
    def addToolBar(self, toolBar, category):
        """
        Public method to add a toolbar to be managed.
        
        @param toolBar reference to the toolbar to be managed (QToolBar)
        @param category category for the toolbar (string)
        """
        if toolBar is None:
            return
        
        newActions = []
        newActionsWithSeparators = []
        actions = toolBar.actions()
        for action in actions:
            actID = id(action)
            self.addAction(action, category)
            if actID in self.__widgetActions:
                self.__widgetActions[actID] = toolBar
            newActionsWithSeparators.append(action)
            if action.isSeparator():
                action = None
            else:
                if toolBar not in self.__actionToToolBars[actID]:
                    self.__actionToToolBars[actID].append(toolBar)
            newActions.append(action)
        tbID = id(toolBar)
        self.__defaultToolBars[tbID] = newActions
        self.__toolBars[tbID] = newActions
        self.__toolBarsWithSeparators[tbID] = newActionsWithSeparators
        self.__allToolBars[tbID] = toolBar
    
    def removeToolBar(self, toolBar):
        """
        Public method to remove a toolbar added with addToolBar().
        
        @param toolBar reference to the toolbar to be removed (QToolBar)
        """
        if toolBar is None:
            return
        
        tbID = id(toolBar)
        
        if tbID not in self.__defaultToolBars:
            return
        
        defaultActions = self.__defaultToolBars[tbID][:]
        self.setToolBar(toolBar, [])
        for action in defaultActions:
            self.removeAction(action)
        
        del self.__defaultToolBars[tbID]
        del self.__toolBars[tbID]
        del self.__toolBarsWithSeparators[tbID]
        del self.__allToolBars[tbID]
        
        for action in defaultActions:
            if action is None:
                toolBar.addSeparator()
            else:
                toolBar.addAction(action)
    
    def setToolBars(self, toolBars):
        """
        Public method to set the actions of several toolbars.
        
        @param toolBars dictionary with toolbar id as key and
            a list of actions as value
        """
        for key, actions in list(toolBars.items()):
            tb = self.__allToolBars[key]
            self.setToolBar(tb, actions)
    
    def setToolBar(self, toolBar, actions):
        """
        Public method to set the actions of a toolbar.
        
        @param toolBar reference to the toolbar to configure (QToolBar)
        @param actions list of actions to be set (list of QAction)
        """
        if toolBar is None:
            return
        
        tbID = id(toolBar)
        if tbID not in self.__toolBars:
            return
        if self.__toolBars[tbID] == actions:
            return
        
        # step 1: check list of actions
        toRemove = {}
        newActions = []
        for action in actions:
            if action is None or \
               (action not in newActions and id(action) in self.__allActions):
                newActions.append(action)
            oldTB = self.toolBarWidgetAction(action)
            if oldTB is not None and oldTB != toolBar:
                if id(oldTB) not in toRemove:
                    toRemove[id(oldTB)] = []
                toRemove[id(oldTB)].append(action)
        self.removeWidgetActions(toRemove)
        
        # step 2: remove all toolbar actions
        for action in self.__toolBarsWithSeparators[tbID]:
            if self.toolBarWidgetAction(action) == tbID:
                self.__widgetActions[id(action)] = None
            toolBar.removeAction(action)
            if action.isSeparator():
                del action
            else:
                self.__actionToToolBars[id(action)].remove(toolBar)
        
        # step 3: set the actions as requested
        newActionsWithSeparators = []
        for action in newActions:
            newAction = None
            if action is None:
                newAction = toolBar.addSeparator()
            elif id(action) in self.__allActions:
                toolBar.addAction(action)
                newAction = action
                self.__actionToToolBars[id(action)].append(toolBar)
                if id(action) in self.__widgetActions:
                    self.__widgetActions[id(action)] = toolBar
            else:
                continue
            newActionsWithSeparators.append(newAction)
        
        if toolBar.isVisible():
            toolBar.hide()
            toolBar.show()
        self.__toolBars[tbID] = newActions
        self.__toolBarsWithSeparators[tbID] = newActionsWithSeparators
    
    def resetToolBar(self, toolBar):
        """
        Public method to reset a toolbar to its default state.
        
        @param toolBar reference to the toolbar to configure (QToolBar)
        """
        if not self.isDefaultToolBar():
            return
        self.setToolBar(toolBar, self.__defaultToolBars[id(toolBar)])
    
    def resetAllToolBars(self):
        """
        Public method to reset all toolbars to their default state.
        """
        self.setToolBars(self.__defaultToolBars)
        for toolBar in self.__customToolBars[:]:
            self.deleteToolBar(toolBar)
        
    def defaultToolBars(self):
        """
        Public method to get all toolbars added with addToolBar().
        
        @return list of all default toolbars (list of QToolBar)
        """
        return list(self.__defaultToolBars.values())
    
    def isDefaultToolBar(self, toolBar):
        """
        Public method to check, if a toolbar was added with addToolBar().
        
        @param toolBar reference to the toolbar to be checked (QToolBar)
        @return flag indicating an added toolbar (boolean)
        """
        return toolBar is not None and \
            id(toolBar) in self.__defaultToolBars
    
    def createToolBar(self, title, name=""):
        """
        Public method to create a custom toolbar.
        
        @param title title to be used for the toolbar (string)
        @param name optional name for the new toolbar (string)
        @return reference to the created toolbar (QToolBar)
        """
        if self.__mainWindow is None:
            return None
        
        toolBar = QToolBar(title, self.__mainWindow)
        toolBar.setToolTip(title)
        if not name:
            index = 1
            customPrefix = "__CustomPrefix__"
            name = "{0}{1:d}".format(customPrefix, index)
            while self.__toolBarByName(name) is not None:
                index += 1
                name = "{0}{1:d}".format(customPrefix, index)
        toolBar.setObjectName(name)
        self.__mainWindow.addToolBar(toolBar)
        
        tbID = id(toolBar)
        self.__customToolBars.append(toolBar)
        self.__allToolBars[tbID] = toolBar
        self.__toolBars[tbID] = []
        self.__toolBarsWithSeparators[tbID] = []
        
        if self.__ui is not None:
            toolBar.setIconSize(self.__ui.getToolBarIconSize())
            self.__ui.registerToolbar(name, title, toolBar)
        
        return toolBar
    
    def deleteToolBar(self, toolBar):
        """
        Public method to remove a custom toolbar created with createToolBar().
        
        @param toolBar reference to the toolbar to be managed (QToolBar)
        """
        if toolBar is None:
            return
        
        tbID = id(toolBar)
        if tbID not in self.__toolBars:
            return
        if tbID in self.__defaultToolBars:
            return
        
        if self.__ui is not None:
            self.__ui.unregisterToolbar(toolBar.objectName())
        
        self.setToolBar(toolBar, [])
        
        del self.__allToolBars[tbID]
        del self.__toolBars[tbID]
        del self.__toolBarsWithSeparators[tbID]
        self.__customToolBars.remove(toolBar)
        self.__mainWindow.removeToolBar(toolBar)
        del toolBar
    
    def renameToolBar(self, toolBar, title):
        """
        Public method to give a toolbar a new title.
        
        @param toolBar reference to the toolbar to be managed (QToolBar)
        @param title title to be used for the toolbar (string)
        """
        if toolBar is None:
            return
        
        toolBar.setWindowTitle(title)
        
        if self.__ui is not None:
            self.__ui.reregisterToolbar(toolBar.objectName(), title)
    
    def toolBars(self):
        """
        Public method to get all toolbars.
        
        @return list of all toolbars (list of QToolBar)
        """
        return list(self.__allToolBars.values())
    
    def addAction(self, action, category):
        """
        Public method to add an action to be managed.
        
        @param action reference to the action to be managed (QAction)
        @param category category for the toolbar (string)
        """
        if action is None:
            return
        if action.isSeparator():
            return
        if id(action) in self.__allActions:
            return
        
        if action.metaObject().className() == "QWidgetAction":
            self.__widgetActions[id(action)] = None
            self.__allWidgetActions[id(action)] = action
        self.__allActions[id(action)] = action
        if category not in self.__categoryToActions:
            self.__categoryToActions[category] = []
        self.__categoryToActions[category].append(action)
        self.__actionToCategory[id(action)] = category
        self.__actionToToolBars[id(action)] = []
    
    def addActions(self, actions, category):
        """
        Public method to add actions to be managed.
        
        @param actions list of actions to be managed
        @type list of QAction
        @param category category for the toolbar
        @type str
        """
        for action in actions:
            self.addAction(action, category)
    
    def removeAction(self, action):
        """
        Public method to remove an action from the manager.
        
        @param action reference to the action to be removed (QAction)
        """
        aID = id(action)
        
        if aID not in self.__allActions:
            return
        
        toolBars = self.__actionToToolBars[aID]
        for toolBar in toolBars:
            tbID = id(toolBar)
            self.__toolBars[tbID].remove(action)
            self.__toolBarsWithSeparators[tbID].remove(action)
            toolBar.removeAction(action)
            if toolBar.isVisible():
                toolBar.hide()
                toolBar.show()
        
        for tbID in self.__defaultToolBars:
            if action in self.__defaultToolBars[tbID]:
                self.__defaultToolBars[tbID].remove(action)
        
        del self.__allActions[aID]
        if aID in self.__widgetActions:
            del self.__widgetActions[aID]
            del self.__allWidgetActions[aID]
        del self.__actionToCategory[aID]
        del self.__actionToToolBars[aID]
        
        for category in self.__categoryToActions:
            if action in self.__categoryToActions[category]:
                self.__categoryToActions[category].remove(action)
    
    def removeCategoryActions(self, category):
        """
        Public method to remove the actions belonging to a category.
        
        @param category category for the actions (string)
        """
        for action in self.categoryActions(category):
            self.removeAction(action)
    
    def saveState(self, version=0):
        """
        Public method to save the state of the toolbar manager.
        
        @param version version number stored with the data (integer)
        @return saved state as a byte array (QByteArray)
        """
        data = QByteArray()
        stream = QDataStream(data, QIODevice.WriteOnly)
        stream.setVersion(QDataStream.Qt_4_6)
        stream.writeUInt16(E5ToolBarManager.VersionMarker)
        stream.writeUInt16(version)
        
        # save default toolbars
        stream.writeUInt16(E5ToolBarManager.ToolBarMarker)
        stream.writeUInt16(len(self.__defaultToolBars))
        for tbID in self.__defaultToolBars:
            tb = self.__allToolBars[tbID]
            if tb.objectName():
                stream.writeString(tb.objectName().encode("utf-8"))
            else:
                stream.writeString(tb.windowTitle().encode("utf-8"))
            stream.writeUInt16(len(self.__toolBars[tbID]))
            for action in self.__toolBars[tbID]:
                if action is not None:
                    if action.objectName():
                        stream.writeString(action.objectName().encode("utf-8"))
                    else:
                        stream.writeString(action.text().encode("utf-8"))
                else:
                    stream.writeString("".encode("utf-8"))
        
        # save the custom toolbars
        stream.writeUInt16(E5ToolBarManager.CustomToolBarMarker)
        stream.writeUInt16(len(self.__toolBars) - len(self.__defaultToolBars))
        for tbID in self.__toolBars:
            if tbID not in self.__defaultToolBars:
                tb = self.__allToolBars[tbID]
                stream.writeString(tb.objectName().encode("utf-8"))
                stream.writeString(tb.windowTitle().encode("utf-8"))
                stream.writeUInt16(len(self.__toolBars[tbID]))
                for action in self.__toolBars[tbID]:
                    if action is not None:
                        if action.objectName():
                            stream.writeString(action.objectName()
                                               .encode("utf-8"))
                        else:
                            stream.writeString(action.text().encode("utf-8"))
                    else:
                        stream.writeString("".encode("utf-8"))
        
        return data
    
    def restoreState(self, state, version=0):
        """
        Public method to restore the state of the toolbar manager.
        
        @param state byte array containing the saved state (QByteArray)
        @param version version number stored with the data (integer)
        @return flag indicating success (boolean)
        """
        if state.isEmpty():
            return False
        
        data = QByteArray(state)
        stream = QDataStream(data, QIODevice.ReadOnly)
        stream.setVersion(QDataStream.Qt_4_6)
        marker = stream.readUInt16()
        vers = stream.readUInt16()
        if marker != E5ToolBarManager.VersionMarker or vers != version:
            return False
        
        tmarker = stream.readUInt16()
        if tmarker != E5ToolBarManager.ToolBarMarker:
            return False
        
        toolBarCount = stream.readUInt16()
        for i in range(toolBarCount):
            objectName = Utilities.readStringFromStream(stream)
            actionCount = stream.readUInt16()
            actions = []
            for j in range(actionCount):
                actionName = Utilities.readStringFromStream(stream)
                if actionName:
                    action = self.__findAction(actionName)
                    if action is not None:
                        actions.append(action)
                else:
                    actions.append(None)
            toolBar = self.__findDefaultToolBar(objectName)
            if toolBar is not None:
                self.setToolBar(toolBar, actions)
        
        cmarker = stream.readUInt16()
        if cmarker != E5ToolBarManager.CustomToolBarMarker:
            return False
        
        oldCustomToolBars = self.__customToolBars[:]
        
        toolBarCount = stream.readUInt16()
        for i in range(toolBarCount):
            objectName = Utilities.readStringFromStream(stream)
            toolBarTitle = Utilities.readStringFromStream(stream)
            actionCount = stream.readUInt16()
            actions = []
            for j in range(actionCount):
                actionName = Utilities.readStringFromStream(stream)
                if actionName:
                    action = self.__findAction(actionName)
                    if action is not None:
                        actions.append(action)
                else:
                    actions.append(None)
            toolBar = self.__toolBarByName(objectName)
            if toolBar is not None:
                toolBar.setWindowTitle(toolBarTitle)
                oldCustomToolBars.remove(toolBar)
            else:
                toolBar = self.createToolBar(toolBarTitle, objectName)
            if toolBar is not None:
                toolBar.setObjectName(objectName)
                self.setToolBar(toolBar, actions)
        
        for tb in oldCustomToolBars:
            self.deleteToolBar(tb)
        
        return True
    
    def toolBarWidgetAction(self, action):
        """
        Public method to get the toolbar for a widget action.
        
        @param action widget action to check for (QAction)
        @return reference to the toolbar containing action (QToolBar)
        """
        aID = id(action)
        if aID in self.__widgetActions:
            return self.__widgetActions[aID]
        return None
    
    def removeWidgetActions(self, actions):
        """
        Public method to remove widget actions.
        
        @param actions dictionary with toolbar id as key and
            a list of widget actions as value
        """
        for tbID in list(actions.keys())[:]:
            toolBar = self.__allToolBars[tbID]
            newActions = self.__toolBars[tbID][:]
            newActionsWithSeparators = self.__toolBarsWithSeparators[tbID][:]
            
            removedActions = []
            for action in actions[tbID]:
                if action in newActions and \
                        self.toolBarWidgetAction(action) == toolBar:
                    newActions.remove(action)
                    newActionsWithSeparators.remove(action)
                    removedActions.append(action)
            
            self.__toolBars[tbID] = newActions
            self.__toolBarsWithSeparators[tbID] = newActionsWithSeparators
            
            for action in removedActions:
                self.__widgetActions[id(action)] = None
                self.__actionToToolBars[id(action)].remove(toolBar)
                toolBar.removeAction(action)
    
    def isWidgetAction(self, action):
        """
        Public method to check, if action is a widget action.
        
        @param action reference to the action to be checked (QAction)
        @return flag indicating a widget action (boolean)
        """
        return id(action) in self.__allWidgetActions
    
    def categories(self):
        """
        Public method to get the list of categories.
        
        @return list of categories (list of string)
        """
        return list(self.__categoryToActions.keys())
    
    def categoryActions(self, category):
        """
        Public method to get the actions belonging to a category.
        
        @param category category for the actions (string)
        @return list of actions (list of QAction)
        """
        if category not in self.__categoryToActions:
            return []
        
        return self.__categoryToActions[category][:]
    
    def actionById(self, aID):
        """
        Public method to get an action given its id.
        
        @param aID id of the action object (integer)
        @return reference to the action (QAction)
        """
        if aID not in self.__allActions:
            return None
        return self.__allActions[aID]
    
    def toolBarById(self, tbID):
        """
        Public method to get a toolbar given its id.
        
        @param tbID id of the toolbar object (integer)
        @return reference to the toolbar (QToolBar)
        """
        if tbID not in self.__allToolBars:
            return None
        return self.__allToolBars[tbID]
    
    def toolBarActions(self, tbID):
        """
        Public method to get a toolbar's actions given its id.
        
        @param tbID id of the toolbar object (integer)
        @return list of actions (list of QAction)
        """
        if tbID not in self.__toolBars:
            return []
        return self.__toolBars[tbID][:]
    
    def toolBarsActions(self):
        """
        Public method to get all toolbars and their actions.
        
        @return reference to dictionary of toolbar IDs as key and list
            of actions as values
        """
        return self.__toolBars
    
    def defaultToolBarActions(self, tbID):
        """
        Public method to get a default toolbar's actions given its id.
        
        @param tbID id of the default toolbar object (integer)
        @return list of actions (list of QAction)
        """
        if tbID not in self.__defaultToolBars:
            return []
        return self.__defaultToolBars[tbID][:]
