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

# Copyright (c) 2014 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show a list of tags or branches.
"""


import os

from PyQt5.QtCore import pyqtSlot, QProcess, Qt, QTimer, QCoreApplication
from PyQt5.QtWidgets import (
    QDialog, QDialogButtonBox, QHeaderView, QTreeWidgetItem, QLineEdit
)

from E5Gui import E5MessageBox

from .Ui_GitTagBranchListDialog import Ui_GitTagBranchListDialog

import Preferences
from Globals import strToQByteArray


class GitTagBranchListDialog(QDialog, Ui_GitTagBranchListDialog):
    """
    Class implementing a dialog to show a list of tags or branches.
    """
    def __init__(self, vcs, parent=None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        super(GitTagBranchListDialog, self).__init__(parent)
        self.setupUi(self)
        self.setWindowFlags(Qt.Window)
        
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.process = QProcess()
        self.vcs = vcs
        
        self.tagList.headerItem().setText(self.tagList.columnCount(), "")
        self.tagList.header().setSortIndicator(1, Qt.AscendingOrder)
        
        self.process.finished.connect(self.__procFinished)
        self.process.readyReadStandardOutput.connect(self.__readStdout)
        self.process.readyReadStandardError.connect(self.__readStderr)
        
        self.show()
        QCoreApplication.processEvents()
    
    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, path, tags, listAll=True, merged=True):
        """
        Public slot to start the tag/branch list command.
        
        @param path name of directory to be listed (string)
        @param tags flag indicating a list of tags is requested
            (False = branches, True = tags)
        @param listAll flag indicating to show all tags or branches (boolean)
        @param merged flag indicating to show only merged or non-merged
            branches (boolean)
        """
        self.tagList.clear()
        
        self.errorGroup.hide()
        
        self.intercept = False
        self.tagsMode = tags
        if tags:
            self.tagList.setHeaderItem(
                QTreeWidgetItem([self.tr("Commit"), self.tr("Name"),
                                 self.tr("Annotation Message")]))
        else:
            self.setWindowTitle(self.tr("Git Branches List"))
            self.tagList.setHeaderItem(
                QTreeWidgetItem([self.tr("Commit"), self.tr("Name")]))
        self.activateWindow()
        
        dname, fname = self.vcs.splitPath(path)
        
        # find the root of the repo
        self.repodir = dname
        while not os.path.isdir(os.path.join(self.repodir, self.vcs.adminDir)):
            self.repodir = os.path.dirname(self.repodir)
            if os.path.splitdrive(self.repodir)[1] == os.sep:
                return
        
        if self.tagsMode:
            args = self.vcs.initCommand("tag")
            args.append('--list')
            args.append('-n')
        else:
            args = self.vcs.initCommand("branch")
            args.append('--list')
            args.append('--all')
            args.append('--verbose')
            if not listAll:
                if merged:
                    args.append("--merged")
                else:
                    args.append("--no-merged")
        
        self.process.kill()
        self.process.setWorkingDirectory(self.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.inputGroup.setEnabled(True)
            self.inputGroup.show()
    
    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.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.__resizeColumns()
        self.__resort()
    
    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()
    
    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 __resort(self):
        """
        Private method to resort the tree.
        """
        self.tagList.sortItems(
            self.tagList.sortColumn(),
            self.tagList.header().sortIndicatorOrder())
    
    def __resizeColumns(self):
        """
        Private method to resize the list columns.
        """
        self.tagList.header().resizeSections(QHeaderView.ResizeToContents)
        self.tagList.header().setStretchLastSection(True)
    
    def __generateItem(self, commit, name, msg="", bold=False, italic=False):
        """
        Private method to generate a tag item in the tag list.
        
        @param commit commit id of the tag/branch (string)
        @param name name of the tag/branch (string)
        @param msg tag annotation message
        @param bold flag indicating to show the entry in bold (boolean)
        @param italic flag indicating to show the entry in italic (boolean)
        """
        itm = QTreeWidgetItem(self.tagList)
        itm.setData(0, Qt.DisplayRole, commit)
        itm.setData(1, Qt.DisplayRole, name)
        if msg:
            itm.setData(2, Qt.DisplayRole, msg)
        itm.setTextAlignment(0, Qt.AlignRight)
        if bold or italic:
            font = itm.font(1)
            if bold:
                font.setBold(True)
            if italic:
                font.setItalic(True)
            itm.setFont(1, font)
    
    def __getCommit(self, tag):
        """
        Private method to get the commit id for a tag.
        
        @param tag tag name (string)
        @return commit id shortened to 10 characters (string)
        """
        args = self.vcs.initCommand("show")
        args.append("--abbrev-commit")
        args.append("--abbrev={0}".format(
            self.vcs.getPlugin().getPreferences("CommitIdLength")))
        args.append("--no-patch")
        args.append(tag)
        
        output = ""
        process = QProcess()
        process.setWorkingDirectory(self.repodir)
        process.start('git', args)
        procStarted = process.waitForStarted(5000)
        if procStarted:
            finished = process.waitForFinished(30000)
            if finished and process.exitCode() == 0:
                output = str(process.readAllStandardOutput(),
                             Preferences.getSystem("IOEncoding"),
                             'replace')
        
        if output:
            for line in output.splitlines():
                if line.startswith("commit "):
                    commitId = line.split()[1]
                    return commitId
        
        return ""
    
    def __readStdout(self):
        """
        Private slot to handle the readyReadStdout signal.
        
        It reads the output of the process, formats it and inserts it into
        the contents pane.
        """
        self.process.setReadChannel(QProcess.StandardOutput)
        
        while self.process.canReadLine():
            s = str(self.process.readLine(),
                    Preferences.getSystem("IOEncoding"),
                    'replace')
            self.__processOutputLine(s)
    
    def __processOutputLine(self, line):
        """
        Private method to process the lines of output.
        
        @param line output line to be processed (string)
        """
        if self.tagsMode:
            name, msg = line.strip().split(None, 1)
            commit = self.__getCommit(name)
            self.__generateItem(commit, name, msg.strip())
        else:
            bold = line.startswith("* ")
            line = line[2:]
            if line.startswith("("):
                name, line = line[1:].split(")", 1)
                commit = line.strip().split(None, 1)[0]
            else:
                data = line.split(None, 2)
                if data[1].startswith("->"):
                    name = " ".join(line.strip().split())
                    commit = ""
                else:
                    commit = data[1]
                    name = data[0]
            italic = name.startswith("remotes/")
            self.__generateItem(commit, name, bold=bold, italic=italic)
    
    def __readStderr(self):
        """
        Private slot to handle the readyReadStderr 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(),
                    Preferences.getSystem("IOEncoding"),
                    'replace')
            self.__showError(s)
    
    def __showError(self, out):
        """
        Private slot to show some error.
        
        @param out error to be shown (string)
        """
        self.errorGroup.show()
        self.errors.insertPlainText(out)
        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(GitTagBranchListDialog, self).keyPressEvent(evt)
