# -*- 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
import tarfile
from PyQt4 import QtGui, QtCore, uic
from preferences import DialogPreferences
from update import UpdateFinder
from about import DialogAbout
from constants import constants
from util import buildResPath
import reader_util


class MainWindowReader(QtGui.QMainWindow):
    class State:
        def __init__(self):
            self.filename = unicode()
            self.definitions = list()
            self.searchPosition = 0
            self.searchText = unicode()
            self.scanPosition = 0
            self.archiveIndex = None


    def __init__(self, parent, preferences, language, filename=None, anki=None, closed=None, updated=None):
        QtGui.QMainWindow.__init__(self, parent)
        uic.loadUi(buildResPath('ui/reader.ui'), self)

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

        self.preferences = preferences
        self.updateFinder = UpdateFinder()
        self.state = self.State()
        self.language = language
        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])

        self.actionOpen.triggered.connect(self.onActionOpen)
        self.actionPreferences.triggered.connect(self.onActionPreferences)
        self.actionAbout.triggered.connect(self.onActionAbout)
        self.actionZoomIn.triggered.connect(self.onActionZoomIn)
        self.actionZoomOut.triggered.connect(self.onActionZoomOut)
        self.actionZoomReset.triggered.connect(self.onActionZoomReset)
        self.actionFind.triggered.connect(self.onActionFind)
        self.actionFindNext.triggered.connect(self.onActionFindNext)
        self.actionToggleWrap.toggled.connect(self.onActionToggleWrap)
        self.actionCopyDefinition.triggered.connect(self.onActionCopyDefinition)
        self.actionCopyAllDefinitions.triggered.connect(self.onActionCopyAllDefinitions)
        self.actionCopySentence.triggered.connect(self.onActionCopySentence)
        self.actionHomepage.triggered.connect(self.onActionHomepage)
        self.actionFeedback.triggered.connect(self.onActionFeedback)
        self.textDefinitions.anchorClicked.connect(self.onDefinitionsAnchorClicked)
        self.textDefinitionSearch.returnPressed.connect(self.onDefinitionSearchReturn)
        self.listDefinitions.itemDoubleClicked.connect(self.onDefinitionDoubleClicked)
        self.dockDefinitions.visibilityChanged.connect(self.onVisibilityChanged)
        self.dockAnki.visibilityChanged.connect(self.onVisibilityChanged)
        self.updateFinder.updateResult.connect(self.onUpdaterSearchResult)

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


    def applyPreferences(self):
        if self.preferences.uiReaderState is not None:
            self.restoreState(QtCore.QByteArray.fromBase64(self.preferences.uiReaderState))
        if self.preferences.uiReaderPosition is not None:
            self.move(QtCore.QPoint(*self.preferences.uiReaderPosition))
        if self.preferences.uiReaderSize is not None:
            self.resize(QtCore.QSize(*self.preferences.uiReaderSize))

        self.comboTags.addItems(self.preferences.ankiTags)
        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.anki is not None:
            self.anki.stopEditing()

        if self.closed is not None:
            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);;Archive files (*.bz2 *.gz *.tar *.tgz);;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 is not None:
                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)
            self.updateDefinitions()
        if command == 'addFactReading':
            markup = reader_util.buildFactMarkupReading(
                definition.reading,
                definition.glossary,
                definition.sentence
            )
            self.ankiAddFact(markup)
            self.updateDefinitions()
        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:
            content = self.openFileByExtension(filename)
        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 openFileByExtension(self, filename):
        self.clearArchiveFiles()

        if tarfile.is_tarfile(filename):
            with tarfile.open(filename, 'r:*') as tp:
                files = [f for f in tp.getnames() if tp.getmember(f).isfile()]
                names = [f.decode('utf-8') for f in files]

                self.updateArchiveFiles(filename, names)

                if len(files) == 0:
                    content = unicode()
                elif len(files) == 1:
                    fp = tp.extractfile(files[0])
                    content = fp.read()
                    fp.close()
                else:
                    index, ok = self.selectFileName(names)
                    if ok:
                        fp = tp.extractfile(files[index])
                        content = fp.read()
                        fp.close()
                        self.state.archiveIndex = index
                    else:
                        content = unicode()
        else:
            self.state.archiveIndex = None
            with open(filename, 'rb') as fp:
                content = fp.read()

        return content


    def selectFileName(self, names):
        if self.state.archiveIndex is not None:
            return (self.state.archiveIndex, True)

        item, ok = QtGui.QInputDialog.getItem(
            self,
            'Yomichan',
            'Select file to open:',
            self.formatQStringList(names),
            current = 0,
            editable=False
        )

        index, success = self.getItemIndex(item)
        return index - 1, ok and success


    def getItemIndex(self, item):
        return item.split('.').first().toInt()


    def formatQStringList(self, list):
        return [self.formatQString(i, x) for i, x in enumerate(list)]


    def formatQString(self, index, item):
        return QtCore.QString(str(index + 1) + '. ').append(QtCore.QString(item))


    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 self.anki is None:
            return False

        fields = reader_util.replaceMarkupInFields(self.preferences.ankiFields, markup)
        tagsSplit = reader_util.splitTags(unicode(self.comboTags.currentText()))
        tagsJoined = ' '.join(tagsSplit)

        tagIndex = self.comboTags.findText(tagsJoined)
        if tagIndex > 0:
            self.comboTags.removeItem(tagIndex)
        if tagIndex != 0:
            self.comboTags.insertItem(0, tagsJoined)
        self.preferences.updateFactTags(tagsJoined)

        factId = self.anki.addNote(self.preferences.ankiDeck, self.preferences.ankiModel, fields, tagsSplit)
        if factId is None:
            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 self.anki is None:
            return False

        fields = reader_util.replaceMarkupInFields(self.preferences.ankiFields, markup)
        return self.anki.canAddNote(self.preferences.ankiDeck, self.preferences.ankiModel, 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 clearArchiveFiles(self):
        self.menuOpenArchive.clear()
        self.menuOpenArchive.setEnabled(False)


    def updateArchiveFiles(self, filename, names):
        self.menuOpenArchive.setEnabled(True)
        for name in self.formatQStringList(names):
            index, ok = self.getItemIndex(name)
            if ok:
                index = index - 1
                self.menuOpenArchive.addAction(name, lambda fn=filename, idx=index: self.openFileInArchive(fn, idx))
            else:
                self.menuOpenArchive.addAction(name, lambda fn=filename: self.openFile(fn))


    def openFileInArchive(self, filename, index):
        self.state.scanPosition = 0
        self.state.archiveIndex = index
        self.openFile(filename)


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