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

# Copyright (c) 2014 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show available remote repositories.
"""

from __future__ import unicode_literals
try:
    str = unicode
except NameError:
    pass

import os

from PyQt5.QtCore import pyqtSlot, Qt, QProcess, QTimer
from PyQt5.QtWidgets import QWidget, QHeaderView, QTreeWidgetItem, \
    QDialogButtonBox, QLineEdit

from E5Gui import E5MessageBox

from .Ui_GitRemoteRepositoriesDialog import Ui_GitRemoteRepositoriesDialog

from .GitUtilities import strToQByteArray

import Preferences


class GitRemoteRepositoriesDialog(QWidget, Ui_GitRemoteRepositoriesDialog):
    """
    Class implementing a dialog to show available remote repositories.
    """
    def __init__(self, vcs, parent=None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        super(GitRemoteRepositoriesDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.vcs = vcs
        self.process = QProcess()
        self.process.finished.connect(self.__procFinished)
        self.process.readyReadStandardOutput.connect(self.__readStdout)
        self.process.readyReadStandardError.connect(self.__readStderr)
        
        self.refreshButton = self.buttonBox.addButton(
            self.tr("Refresh"), QDialogButtonBox.ActionRole)
        self.refreshButton.setToolTip(
            self.tr("Press to refresh the repositories display"))
        self.refreshButton.setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.__lastColumn = self.repolist.columnCount()
        
        self.repolist.headerItem().setText(self.__lastColumn, "")
        self.repolist.header().setSortIndicator(0, Qt.AscendingOrder)
        
        self.__ioEncoding = Preferences.getSystem("IOEncoding")
    
    def __resort(self):
        """
        Private method to resort the list.
        """
        self.repolist.sortItems(
            self.repolist.sortColumn(),
            self.repolist.header().sortIndicatorOrder())
    
    def __resizeColumns(self):
        """
        Private method to resize the list columns.
        """
        self.repolist.header().resizeSections(QHeaderView.ResizeToContents)
        self.repolist.header().setStretchLastSection(True)
    
    def __generateItem(self, name, url, oper):
        """
        Private method to generate a status item in the status list.
        
        @param name name of the remote repository (string)
        @param url URL of the remote repository (string)
        @param oper operation the remote repository may be used for (string)
        """
        foundItems = self.repolist.findItems(name, Qt.MatchExactly, 0)
        if foundItems:
            # modify the operations column only
            foundItems[0].setText(
                2, "{0} + {1}".format(foundItems[0].text(2), oper))
        else:
            QTreeWidgetItem(self.repolist, [name, url, oper])
    
    def closeEvent(self, e):
        """
        Protected slot implementing a close event handler.
        
        @param e close event (QCloseEvent)
        """
        if self.process is not None and \
           self.process.state() != QProcess.NotRunning:
            self.process.terminate()
            QTimer.singleShot(2000, self.process.kill)
            self.process.waitForFinished(3000)
        
        e.accept()
    
    def start(self, projectDir):
        """
        Public slot to start the git remote command.
        
        @param projectDir name of the project directory (string)
        """
        self.repolist.clear()
        
        self.errorGroup.hide()
        self.intercept = False
        self.projectDir = projectDir
        
        self.__ioEncoding = Preferences.getSystem("IOEncoding")
        
        self.removeButton.setEnabled(False)
        self.renameButton.setEnabled(False)
        self.pruneButton.setEnabled(False)
        self.showInfoButton.setEnabled(False)
        
        args = self.vcs.initCommand("remote")
        args.append('--verbose')
        
        # find the root of the repo
        repodir = self.projectDir
        while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
            repodir = os.path.dirname(repodir)
            if os.path.splitdrive(repodir)[1] == os.sep:
                return
        
        self.process.kill()
        self.process.setWorkingDirectory(repodir)
        
        self.process.start('git', args)
        procStarted = self.process.waitForStarted(5000)
        if not procStarted:
            self.inputGroup.setEnabled(False)
            self.inputGroup.hide()
            E5MessageBox.critical(
                self,
                self.tr('Process Generation Error'),
                self.tr(
                    'The process {0} could not be started. '
                    'Ensure, that it is in the search path.'
                ).format('git'))
        else:
            self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
            self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
            self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
            
            self.inputGroup.setEnabled(True)
            self.inputGroup.show()
            self.refreshButton.setEnabled(False)
    
    def __finish(self):
        """
        Private slot called when the process finished or the user pressed
        the button.
        """
        if self.process is not None and \
           self.process.state() != QProcess.NotRunning:
            self.process.terminate()
            QTimer.singleShot(2000, self.process.kill)
            self.process.waitForFinished(3000)
        
        self.inputGroup.setEnabled(False)
        self.inputGroup.hide()
        self.refreshButton.setEnabled(True)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        self.buttonBox.button(QDialogButtonBox.Close).setFocus(
            Qt.OtherFocusReason)
        
        self.__resort()
        self.__resizeColumns()
        
        self.__updateButtons()
    
    def on_buttonBox_clicked(self, button):
        """
        Private slot called by a button of the button box clicked.
        
        @param button button that was clicked (QAbstractButton)
        """
        if button == self.buttonBox.button(QDialogButtonBox.Close):
            self.close()
        elif button == self.buttonBox.button(QDialogButtonBox.Cancel):
            self.__finish()
        elif button == self.refreshButton:
            self.on_refreshButton_clicked()
    
    def __procFinished(self, exitCode, exitStatus):
        """
        Private slot connected to the finished signal.
        
        @param exitCode exit code of the process (integer)
        @param exitStatus exit status of the process (QProcess.ExitStatus)
        """
        self.__finish()
    
    def __readStdout(self):
        """
        Private slot to handle the readyReadStandardOutput signal.
        
        It reads the output of the process, formats it and inserts it into
        the contents pane.
        """
        if self.process is not None:
            self.process.setReadChannel(QProcess.StandardOutput)
            
            while self.process.canReadLine():
                line = str(self.process.readLine(), self.__ioEncoding,
                           'replace').strip()
                
                name, line = line.split(None, 1)
                url, oper = line.rsplit(None, 1)
                oper = oper[1:-1]   # it is enclosed in ()
                self.__generateItem(name, url, oper)
    
    def __readStderr(self):
        """
        Private slot to handle the readyReadStandardError signal.
        
        It reads the error output of the process and inserts it into the
        error pane.
        """
        if self.process is not None:
            s = str(self.process.readAllStandardError(),
                    self.__ioEncoding, 'replace')
            self.errorGroup.show()
            self.errors.insertPlainText(s)
            self.errors.ensureCursorVisible()
    
    def on_passwordCheckBox_toggled(self, isOn):
        """
        Private slot to handle the password checkbox toggled.
        
        @param isOn flag indicating the status of the check box (boolean)
        """
        if isOn:
            self.input.setEchoMode(QLineEdit.Password)
        else:
            self.input.setEchoMode(QLineEdit.Normal)
    
    @pyqtSlot()
    def on_sendButton_clicked(self):
        """
        Private slot to send the input to the git process.
        """
        inputTxt = self.input.text()
        inputTxt += os.linesep
        
        if self.passwordCheckBox.isChecked():
            self.errors.insertPlainText(os.linesep)
            self.errors.ensureCursorVisible()
        else:
            self.errors.insertPlainText(inputTxt)
            self.errors.ensureCursorVisible()
        
        self.process.write(strToQByteArray(inputTxt))
        
        self.passwordCheckBox.setChecked(False)
        self.input.clear()
    
    def on_input_returnPressed(self):
        """
        Private slot to handle the press of the return key in the input field.
        """
        self.intercept = True
        self.on_sendButton_clicked()
    
    def keyPressEvent(self, evt):
        """
        Protected slot to handle a key press event.
        
        @param evt the key press event (QKeyEvent)
        """
        if self.intercept:
            self.intercept = False
            evt.accept()
            return
        super(GitRemoteRepositoriesDialog, self).keyPressEvent(evt)
    
    @pyqtSlot()
    def on_refreshButton_clicked(self):
        """
        Private slot to refresh the status display.
        """
        self.start(self.projectDir)
    
    def __updateButtons(self):
        """
        Private method to update the buttons status.
        """
        enable = len(self.repolist.selectedItems()) == 1
        
        self.removeButton.setEnabled(enable)
        self.renameButton.setEnabled(enable)
        self.pruneButton.setEnabled(enable)
        self.showInfoButton.setEnabled(enable)
    
    @pyqtSlot()
    def on_repolist_itemSelectionChanged(self):
        """
        Private slot to act upon changes of selected items.
        """
        self.__updateButtons()
    
    @pyqtSlot()
    def on_addButton_clicked(self):
        """
        Private slot to add a remote repository.
        """
        self.vcs.gitAddRemote(self.projectDir)
        self.on_refreshButton_clicked()
    
    @pyqtSlot()
    def on_renameButton_clicked(self):
        """
        Private slot to rename a remote repository.
        """
        remoteName = self.repolist.selectedItems()[0].text(0)
        self.vcs.gitRenameRemote(self.projectDir, remoteName)
        self.on_refreshButton_clicked()
    
    @pyqtSlot()
    def on_removeButton_clicked(self):
        """
        Private slot to remove a remote repository.
        """
        remoteName = self.repolist.selectedItems()[0].text(0)
        self.vcs.gitRemoveRemote(self.projectDir, remoteName)
        self.on_refreshButton_clicked()
    
    @pyqtSlot()
    def on_showInfoButton_clicked(self):
        """
        Private slot to show information about a remote repository.
        """
        remoteName = self.repolist.selectedItems()[0].text(0)
        self.vcs.gitShowRemote(self.projectDir, remoteName)
    
    @pyqtSlot()
    def on_pruneButton_clicked(self):
        """
        Private slot to prune all stale remote-tracking branches.
        """
        remoteName = self.repolist.selectedItems()[0].text(0)
        self.vcs.gitPruneRemote(self.projectDir, remoteName)
