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

# Copyright (c) 2009 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to manage history.
"""


from PyQt5.QtCore import pyqtSignal, Qt, QUrl
from PyQt5.QtGui import QFontMetrics, QCursor
from PyQt5.QtWidgets import QDialog, QMenu, QApplication

from E5Gui.E5TreeSortFilterProxyModel import E5TreeSortFilterProxyModel

from .HistoryModel import HistoryModel

from .Ui_HistoryDialog import Ui_HistoryDialog


class HistoryDialog(QDialog, Ui_HistoryDialog):
    """
    Class implementing a dialog to manage history.
    
    @signal openUrl(QUrl, str) emitted to open a URL in the current tab
    @signal newTab(QUrl, str) emitted to open a URL in a new tab
    @signal newBackgroundTab(QUrl, str) emitted to open a URL in a new
        background tab
    @signal newWindow(QUrl, str) emitted to open a URL in a new window
    @signal newPrivateWindow(QUrl, str) emitted to open a URL in a new
        private window
    """
    openUrl = pyqtSignal(QUrl, str)
    newTab = pyqtSignal(QUrl, str)
    newBackgroundTab = pyqtSignal(QUrl, str)
    newWindow = pyqtSignal(QUrl, str)
    newPrivateWindow = pyqtSignal(QUrl, str)
    
    def __init__(self, parent=None, manager=None):
        """
        Constructor
        
        @param parent reference to the parent widget (QWidget
        @param manager reference to the history manager object (HistoryManager)
        """
        super(HistoryDialog, self).__init__(parent)
        self.setupUi(self)
        self.setWindowFlags(Qt.Window)
        
        self.__historyManager = manager
        if self.__historyManager is None:
            import WebBrowser.WebBrowserWindow
            self.__historyManager = (
                WebBrowser.WebBrowserWindow.WebBrowserWindow.historyManager()
            )
        
        self.__model = self.__historyManager.historyTreeModel()
        self.__proxyModel = E5TreeSortFilterProxyModel(self)
        self.__proxyModel.setSortRole(HistoryModel.DateTimeRole)
        self.__proxyModel.setFilterKeyColumn(-1)
        self.__proxyModel.setSourceModel(self.__model)
        self.historyTree.setModel(self.__proxyModel)
        self.historyTree.expandAll()
        fm = QFontMetrics(self.font())
        header = fm.width("m") * 40
        self.historyTree.header().resizeSection(0, header)
        self.historyTree.header().resizeSection(1, header)
        self.historyTree.header().setStretchLastSection(True)
        self.historyTree.setContextMenuPolicy(Qt.CustomContextMenu)
        
        self.historyTree.activated.connect(self.__activated)
        self.historyTree.customContextMenuRequested.connect(
            self.__customContextMenuRequested)
        
        self.searchEdit.textChanged.connect(
            self.__proxyModel.setFilterFixedString)
        self.removeButton.clicked.connect(self.historyTree.removeSelected)
        self.removeAllButton.clicked.connect(self.__historyManager.clear)
        
        self.__proxyModel.modelReset.connect(self.__modelReset)
    
    def __modelReset(self):
        """
        Private slot handling a reset of the tree view's model.
        """
        self.historyTree.expandAll()
    
    def __customContextMenuRequested(self, pos):
        """
        Private slot to handle the context menu request for the bookmarks tree.
        
        @param pos position the context menu was requested (QPoint)
        """
        menu = QMenu()
        idx = self.historyTree.indexAt(pos)
        idx = idx.sibling(idx.row(), 0)
        if (
            idx.isValid() and
            not self.historyTree.model().hasChildren(idx) and
            len(self.historyTree.selectionModel().selectedRows()) == 1
        ):
            menu.addAction(
                self.tr("&Open"),
                self.__openHistoryInCurrentTab)
            menu.addAction(
                self.tr("Open in New &Tab"),
                self.__openHistoryInNewTab)
            menu.addAction(
                self.tr("Open in New &Background Tab"),
                self.__openHistoryInNewBackgroundTab)
            menu.addAction(
                self.tr("Open in New &Window"),
                self.__openHistoryInNewWindow)
            menu.addAction(
                self.tr("Open in New Pri&vate Window"),
                self.__openHistoryInPrivateWindow)
            menu.addSeparator()
            menu.addAction(self.tr("&Copy"), self.__copyHistory)
        menu.addAction(self.tr("&Remove"), self.historyTree.removeSelected)
        menu.exec_(QCursor.pos())
    
    def __activated(self, idx):
        """
        Private slot to handle the activation of an entry.
        
        @param idx reference to the entry index (QModelIndex)
        """
        if QApplication.keyboardModifiers() & Qt.ControlModifier:
            self.__openHistoryInNewTab()
        elif QApplication.keyboardModifiers() & Qt.ShiftModifier:
            self.__openHistoryInNewWindow()
        else:
            self.__openHistoryInCurrentTab()
        
    def __openHistoryInCurrentTab(self):
        """
        Private slot to open a history entry in the current browser tab.
        """
        self.__openHistory()
    
    def __openHistoryInNewTab(self):
        """
        Private slot to open a history entry in a new browser tab.
        """
        self.__openHistory(newTab=True)
    
    def __openHistoryInNewBackgroundTab(self):
        """
        Private slot to open a history entry in a new background tab.
        """
        self.__openHistory(newTab=True, background=True)
    
    def __openHistoryInNewWindow(self):
        """
        Private slot to open a history entry in a new browser window.
        """
        self.__openHistory(newWindow=True)
    
    def __openHistoryInPrivateWindow(self):
        """
        Private slot to open a history entry in a new private browser window.
        """
        self.__openHistory(newWindow=True, privateWindow=True)
    
    def __openHistory(self, newTab=False, background=False,
                      newWindow=False, privateWindow=False):
        """
        Private method to open a history entry.
        
        @param newTab flag indicating to open the feed message in a new tab
        @type bool
        @param background flag indicating to open the bookmark in a new
            background tab
        @type bool
        @param newWindow flag indicating to open the bookmark in a new window
        @type bool
        @param privateWindow flag indicating to open the bookmark in a new
            private window
        @type bool
            (boolean)
        """
        idx = self.historyTree.currentIndex()
        if newTab:
            if background:
                self.newBackgroundTab.emit(
                    idx.data(HistoryModel.UrlRole),
                    idx.data(HistoryModel.TitleRole))
            else:
                self.newTab.emit(
                    idx.data(HistoryModel.UrlRole),
                    idx.data(HistoryModel.TitleRole))
        elif newWindow:
            if privateWindow:
                self.newPrivateWindow.emit(
                    idx.data(HistoryModel.UrlRole),
                    idx.data(HistoryModel.TitleRole))
            else:
                self.newWindow.emit(
                    idx.data(HistoryModel.UrlRole),
                    idx.data(HistoryModel.TitleRole))
        else:
            self.openUrl.emit(
                idx.data(HistoryModel.UrlRole),
                idx.data(HistoryModel.TitleRole))
    
    def __copyHistory(self):
        """
        Private slot to copy a history entry's URL to the clipboard.
        """
        idx = self.historyTree.currentIndex()
        if not idx.parent().isValid():
            return
        
        url = idx.data(HistoryModel.UrlStringRole)
        
        clipboard = QApplication.clipboard()
        clipboard.setText(url)
