# -*- coding: utf-8 -*-
# Copyright (C) 2011  Alex Yatskov
#
# 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 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import os
from PyQt4 import QtGui, QtCore
from reader_ui import Ui_MainWindowReader
from preferences import DialogPreferences
from preference_data import Preferences
from update import UpdateFinder
from about import DialogAbout
from constants import constants
import reader_util


class MainWindowReader(QtGui.QMainWindow, Ui_MainWindowReader):
    class State:
        def __init__(self):
            self.filename = unicode()
            self.definitions = list()
            self.searchPosition = 0
            self.searchText = unicode()
            self.scanPosition = 0


    def __init__(self, parent=None, languages=None, filename=None, preferences=None, anki=None, closed=None, updated=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.setupUi(self)

        self.textContent.mouseMoveEvent = self.onContentMouseMove
        self.textContent.mousePressEvent = self.onContentMousePress
        self.dockAnki.setEnabled(bool(anki))

        if preferences:
            self.preferences = preferences
        else:
            self.preferences = Preferences()
            self.preferences.load()

        self.updateFinder = UpdateFinder()
        self.state = self.State()
        self.languages = languages
        self.addedFacts = list()
        self.anki = anki
        self.closed = closed
        self.updated = updated
        self.zoom = 0

        self.applyPreferences()
        self.updateRecentFiles()
        self.updateDefinitions()

        if filename:
            self.openFile(filename)
        elif self.preferences.generalRecentLoad:
            filenames = self.preferences.recentFiles()
            if filenames:
                self.openFile(filenames[0])

        if self.preferences.generalFindUpdates:
            self.updateFinder.start()

        bindings = [
            (self.actionOpen, 'triggered()', self.onActionOpen),
            (self.actionPreferences, 'triggered()', self.onActionPreferences),
            (self.actionAbout, 'triggered()', self.onActionAbout),
            (self.actionZoomIn, 'triggered()', self.onActionZoomIn),
            (self.actionZoomOut, 'triggered()', self.onActionZoomOut),
            (self.actionZoomReset, 'triggered()', self.onActionZoomReset),
            (self.actionFind, 'triggered()', self.onActionFind),
            (self.actionFindNext, 'triggered()', self.onActionFindNext),
            (self.actionToggleWrap, 'toggled(bool)', self.onActionToggleWrap),
            (self.actionCopyDefinition, 'triggered()', self.onActionCopyDefinition),
            (self.actionCopyAllDefinitions, 'triggered()', self.onActionCopyAllDefinitions),
            (self.actionCopySentence, 'triggered()', self.onActionCopySentence),
            (self.actionHomepage, 'triggered()', self.onActionHomepage),
            (self.actionFeedback, 'triggered()', self.onActionFeedback),
            (self.textDefinitions, 'anchorClicked(const QUrl&)', self.onDefinitionsAnchorClicked),
            (self.textDefinitionSearch, 'returnPressed()', self.onDefinitionSearchReturn),
            (self.listDefinitions, 'itemDoubleClicked(QListWidgetItem *)', self.onDefinitionDoubleClicked),
            (self.dockDefinitions, 'visibilityChanged(bool)', self.onVisibilityChanged),
            (self.dockAnki, 'visibilityChanged(bool)', self.onVisibilityChanged),
            (self.updateFinder, 'updateSearchResult', self.onUpdaterSearchResult)
        ]

        for action, signal, callback in bindings:
            self.connect(action, QtCore.SIGNAL(signal), callback)


    def applyPreferences(self):
        if self.preferences.uiReaderState != None:
            self.restoreState(QtCore.QByteArray.fromBase64(self.preferences.uiReaderState))
        if self.preferences.uiReaderPosition != None:
            self.move(QtCore.QPoint(*self.preferences.uiReaderPosition))
        if self.preferences.uiReaderSize != None:
            self.resize(QtCore.QSize(*self.preferences.uiReaderSize))

        for tags in self.preferences.ankiTags:
            self.comboTags.addItem(tags)

        self.applyPreferencesContent()


    def applyPreferencesContent(self):
        palette = self.textContent.palette()
        palette.setColor(QtGui.QPalette.Base, QtGui.QColor(self.preferences.uiContentColorBg))
        palette.setColor(QtGui.QPalette.Text, QtGui.QColor(self.preferences.uiContentColorFg))
        self.textContent.setPalette(palette)

        font = self.textContent.font()
        font.setFamily(self.preferences.uiContentFontFamily)
        font.setPointSize(self.preferences.uiContentFontSize + self.zoom)
        self.textContent.setFont(font)

        self.actionToggleWrap.setChecked(self.preferences.uiContentWordWrap)


    def closeEvent(self, event):
        self.closeFile()
        self.preferences.uiReaderState = self.saveState().toBase64()
        self.preferences.save()

        if self.closed:
            self.closed()


    def keyPressEvent(self, event):
        if self.dockDefinitions.isVisible() and event.key() == QtCore.Qt.Key_Shift:
            self.updateSampleFromPosition()


    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls():
            event.acceptProposedAction()


    def dropEvent(self, event):
        url = event.mimeData().urls()[0]
        self.openFile(url.toLocalFile())


    def moveEvent(self, event):
        self.preferences.uiReaderPosition = (event.pos().x(), event.pos().y())


    def resizeEvent(self, event):
        self.preferences.uiReaderSize = (event.size().width(), event.size().height())


    def onActionOpen(self):
        filename = QtGui.QFileDialog.getOpenFileName(
            parent=self,
            caption='Select a file to open',
            filter='Text files (*.txt);;All files (*.*)'
        )
        if not filename.isNull():
            self.openFile(filename)


    def onActionPreferences(self):
        dialog = DialogPreferences(self, self.preferences, self.anki)
        if dialog.exec_() == QtGui.QDialog.Accepted:
            self.applyPreferencesContent()
            if self.updated:
                self.updated()


    def onActionAbout(self):
        dialog = DialogAbout(self)
        dialog.exec_()


    def onActionZoomIn(self):
        font = self.textContent.font()
        if font.pointSize() < 72:
            font.setPointSize(font.pointSize() + 1)
            self.textContent.setFont(font)
            self.zoom += 1


    def onActionZoomOut(self):
        font = self.textContent.font()
        if font.pointSize() > 1:
            font.setPointSize(font.pointSize() - 1)
            self.textContent.setFont(font)
            self.zoom -= 1


    def onActionZoomReset(self):
        if self.zoom:
            font = self.textContent.font()
            font.setPointSize(font.pointSize() - self.zoom)
            self.textContent.setFont(font)
            self.zoom = 0


    def onActionFind(self):
        searchText = self.state.searchText

        cursor = self.textContent.textCursor()
        if cursor.hasSelection():
            searchText = cursor.selectedText()

        searchText, ok = QtGui.QInputDialog.getText(self, 'Find', 'Search text:', text=searchText)
        if searchText and ok:
            self.findText(searchText)


    def onActionFindNext(self):
        if self.state.searchText:
            self.findText(self.state.searchText)


    def onActionToggleWrap(self, wrap):
        mode = QtGui.QPlainTextEdit.WidgetWidth if wrap else QtGui.QPlainTextEdit.NoWrap
        self.preferences.uiContentWordWrap = wrap
        self.textContent.setLineWrapMode(wrap)


    def onActionCopyDefinition(self):
        reader_util.copyDefinitions(self.state.definitions[:1])


    def onActionCopyAllDefinitions(self):
        reader_util.copyDefinitions(self.state.definitions)


    def onActionCopySentence(self):
        content = unicode(self.textContent.toPlainText())
        sentence = reader_util.findSentence(content, self.state.scanPosition)
        QtGui.QApplication.clipboard().setText(sentence)


    def onActionHomepage(self):
        url = QtCore.QUrl(constants['urlHomepage'])
        QtGui.QDesktopServices().openUrl(url)


    def onActionFeedback(self):
        url = QtCore.QUrl(constants['urlFeedback'])
        QtGui.QDesktopServices().openUrl(url)


    def onDefinitionsAnchorClicked(self, url):
        command, index = unicode(url.toString()).split(':')
        definition = self.state.definitions[int(index)]

        if command == 'addFactExpression':
            markup = reader_util.buildFactMarkupExpression(
                definition.expression,
                definition.reading,
                definition.glossary,
                definition.sentence
            )
            self.ankiAddFact(markup)
        if command == 'addFactReading':
            markup = reader_util.buildFactMarkupReading(
                definition.reading,
                definition.glossary,
                definition.sentence
            )
            self.ankiAddFact(markup)
        elif command == 'copyDefinition':
            reader_util.copyDefinitions([definition])


    def onDefinitionSearchReturn(self):
        text = unicode(self.textDefinitionSearch.text())
        definitions, length = self.language().wordSearch(
            text,
            self.preferences.searchResultMax,
            self.preferences.searchGroupByExp
        )
        self.state.definitions = reader_util.convertDefinitions(definitions)
        self.updateDefinitions()


    def onDefinitionDoubleClicked(self, item):
        if self.anki:
            row = self.listDefinitions.row(item)
            self.anki.browseFact(self.addedFacts[row])


    def onVisibilityChanged(self, visible):
        self.actionToggleAnki.setChecked(self.dockAnki.isVisible())
        self.actionToggleDefinitions.setChecked(self.dockDefinitions.isVisible())


    def onUpdaterSearchResult(self, result):
        if result and result > constants['version']:
            QtGui.QMessageBox.information(
                self,
                'Yomichan',
                'A new version of Yomichan is available for download!\n\nYou can download this update ({0} > {1}) ' \
                'from "Shared Plugins" in Anki or directly from the Yomichan homepage.'.format(constants['version'], result)
            )


    def onContentMouseMove(self, event):
        QtGui.QPlainTextEdit.mouseMoveEvent(self.textContent, event)
        self.updateSampleMouseEvent(event)


    def onContentMousePress(self, event):
        QtGui.QPlainTextEdit.mousePressEvent(self.textContent, event)
        self.updateSampleMouseEvent(event)


    def openFile(self, filename):
        filename = unicode(filename)
        try:
            with open(filename.encode('utf-8'), 'rb') as fp:
                content = fp.read()
        except IOError:
            self.setStatus(u'Failed to load file {0}'.format(filename))
            QtGui.QMessageBox.critical(self, 'Yomichan', 'Cannot open file for read')
            return

        self.closeFile()

        self.state.filename = filename
        self.state.scanPosition = self.preferences.filePosition(filename)
        if self.state.scanPosition > len(content):
            self.state.scanPosition = 0

        self.updateRecentFile()
        self.updateRecentFiles()

        content, encoding = reader_util.decodeContent(content)
        if self.preferences.generalReadingsStrip:
            content = reader_util.stripContentReadings(content)

        self.textContent.setPlainText(content)
        if self.state.scanPosition > 0:
            cursor = self.textContent.textCursor()
            cursor.setPosition(self.state.scanPosition)
            self.textContent.setTextCursor(cursor)
            self.textContent.centerCursor()

        self.setStatus(u'Loaded file {0}'.format(filename))
        self.setWindowTitle(u'Yomichan - {0} ({1})'.format(os.path.split(filename)[1], encoding))

    def closeFile(self):
        self.setWindowTitle('Yomichan')
        self.textContent.setPlainText(unicode())
        self.updateRecentFile(False)
        self.state = self.State()


    def findText(self, text):
        content = self.textContent.toPlainText()
        index = content.indexOf(text, self.state.searchPosition)

        if index == -1:
            wrap = self.state.searchPosition != 0
            self.state.searchPosition = 0
            if wrap:
                self.findText(text)
            else:
                QtGui.QMessageBox.information(self, 'Yomichan', 'Search text not found')
        else:
            self.state.searchPosition = index + len(text)
            cursor = self.textContent.textCursor()
            cursor.setPosition(index, QtGui.QTextCursor.MoveAnchor)
            cursor.setPosition(self.state.searchPosition, QtGui.QTextCursor.KeepAnchor)
            self.textContent.setTextCursor(cursor)

        self.state.searchText = text


    def ankiAddFact(self, markup):
        if not self.anki:
            return False

        fields = reader_util.replaceMarkupInFields(self.preferences.ankiFields, markup)

        tags = self.anki.cleanupTags(unicode(self.comboTags.currentText()))
        tagIndex = self.comboTags.findText(tags)
        if tagIndex > 0:
            self.comboTags.removeItem(tagIndex)
        if tagIndex != 0:
            self.comboTags.insertItem(0, tags)
        self.preferences.updateFactTags(tags)

        factId = self.anki.addFact(fields, tags)
        if not factId:
            return False

        expression, reading = markup['%e'], markup['%r']
        summary = expression
        if reading:
            summary = u'{0} [{1}]'.format(expression, reading)

        self.addedFacts.append(factId)
        self.listDefinitions.addItem(summary)
        self.listDefinitions.setCurrentRow(self.listDefinitions.count() - 1)
        self.setStatus(u'Added expression {0}; {1} new fact(s) total'.format(expression, len(self.addedFacts)))

        self.updateDefinitions()
        return True


    def ankiIsFactValid(self, markup):
        if not self.anki:
            return False

        fields = reader_util.replaceMarkupInFields(self.preferences.ankiFields, markup)
        return self.anki.canAddFact(fields)


    def updateSampleMouseEvent(self, event):
        cursor = self.textContent.cursorForPosition(event.pos())
        self.state.scanPosition = cursor.position()
        requested = event.buttons() & QtCore.Qt.MidButton or event.modifiers() & QtCore.Qt.ShiftModifier
        if self.dockDefinitions.isVisible() and requested:
            self.updateSampleFromPosition()


    def updateSampleFromPosition(self):
        samplePosStart = self.state.scanPosition
        samplePosEnd = self.state.scanPosition + self.preferences.searchScanMax

        cursor = self.textContent.textCursor()
        content = unicode(self.textContent.toPlainText())
        contentSample = content[samplePosStart:samplePosEnd]

        if not contentSample or unicode.isspace(contentSample[0]):
            cursor.clearSelection()
            self.textContent.setTextCursor(cursor)
            return

        contentSampleFlat = contentSample.replace('\n', unicode())
        definitionsMatched, lengthMatched = self.language().wordSearch(
            contentSampleFlat,
            self.preferences.searchResultMax,
            self.preferences.searchGroupByExp
        )
        sentence = reader_util.findSentence(content, samplePosStart)

        self.state.definitions = reader_util.convertDefinitions(definitionsMatched, sentence)
        self.updateDefinitions()

        lengthSelect = 0
        if lengthMatched:
            for c in contentSample:
                lengthSelect += 1
                if c != '\n':
                    lengthMatched -= 1
                if lengthMatched <= 0:
                    break

        cursor.setPosition(samplePosStart, QtGui.QTextCursor.MoveAnchor)
        cursor.setPosition(samplePosStart + lengthSelect, QtGui.QTextCursor.KeepAnchor)
        self.textContent.setTextCursor(cursor)


    def clearRecentFiles(self):
        self.preferences.clearFiles()
        self.updateRecentFiles()


    def updateRecentFiles(self):
        self.menuOpenRecent.clear()

        filenames = self.preferences.recentFiles()
        if not filenames:
            return

        for filename in filenames:
            self.menuOpenRecent.addAction(filename, (lambda fn=filename: self.openFile(fn)))

        self.menuOpenRecent.addSeparator()
        self.menuOpenRecent.addAction('Clear file history', self.clearRecentFiles)


    def updateRecentFile(self, addIfNeeded=True):
        if self.state.filename:
            if addIfNeeded or self.state.filename in self.preferences.recentFiles():
                self.preferences.updateRecentFile(self.state.filename, self.state.scanPosition)


    def updateDefinitions(self):
        html = reader_util.buildDefinitionsHtml(self.state.definitions, self.ankiIsFactValid)
        self.textDefinitions.setHtml(html)


    def setStatus(self, status):
        self.statusBar.showMessage(status)


    def language(self):
        return self.languages['Japanese']