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

# Copyright (c) 2013 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show some summary information of the working
directory state.
"""

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

import os

from PyQt5.QtCore import pyqtSlot, QProcess, QTimer
from PyQt5.QtWidgets import QDialog, QDialogButtonBox

from E5Gui import E5MessageBox

from .HgUtilities import prepareProcess

from .Ui_HgSummaryDialog import Ui_HgSummaryDialog


class HgSummaryDialog(QDialog, Ui_HgSummaryDialog):
    """
    Class implementing a dialog to show some summary information of the working
    directory state.
    """
    def __init__(self, vcs, parent=None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        super(HgSummaryDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.refreshButton = self.buttonBox.addButton(
            self.tr("Refresh"), QDialogButtonBox.ActionRole)
        self.refreshButton.setToolTip(
            self.tr("Press to refresh the summary display"))
        self.refreshButton.setEnabled(False)
        
        self.vcs = vcs
        self.vcs.committed.connect(self.__committed)
        
        self.process = QProcess()
        prepareProcess(self.process, language="C")
        self.process.finished.connect(self.__procFinished)
        self.process.readyReadStandardOutput.connect(self.__readStdout)
        self.process.readyReadStandardError.connect(self.__readStderr)
    
    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, mq=False, largefiles=False):
        """
        Public slot to start the hg summary command.
        
        @param path path name of the working directory (string)
        @param mq flag indicating to show the queue status as well (boolean)
        @param largefiles flag indicating to show the largefiles status as
            well (boolean)
        """
        self.errorGroup.hide()
        self.refreshButton.setEnabled(False)
        self.summary.clear()
        
        self.__path = path
        self.__mq = mq
        self.__largefiles = largefiles
        
        args = self.vcs.initCommand("summary")
        if self.vcs.canPull():
            args.append("--remote")
        if self.__mq:
            args.append("--mq")
        if self.__largefiles:
            args.append("--large")
        
        # find the root of the repo
        repodir = self.__path
        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
        
        if self.process:
            self.process.kill()
        
        self.process.setWorkingDirectory(repodir)
        
        self.__buffer = []
        
        self.process.start('hg', args)
        procStarted = self.process.waitForStarted(5000)
        if not procStarted:
            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('hg'))
    
    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.refreshButton.setEnabled(True)
    
    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.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.__processOutput(self.__buffer)
        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.vcs.getEncoding(),
                           'replace')
                self.__buffer.append(line)
    
    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.vcs.getEncoding(), '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()
    
    @pyqtSlot()
    def on_refreshButton_clicked(self):
        """
        Private slot to refresh the status display.
        """
        self.start(self.__path, mq=self.__mq)
    
    def __committed(self):
        """
        Private slot called after the commit has finished.
        """
        if self.isVisible():
            self.on_refreshButton_clicked()
    
    def __processOutput(self, output):
        """
        Private method to process the output into nice readable text.
        
        @param output output from the summary command (string)
        """
        infoDict = {}
        
        # step 1: parse the output
        while output:
            line = output.pop(0)
            if ':' not in line:
                continue
            name, value = line.split(": ", 1)
            value = value.strip()
            
            if name == "parent":
                if " " in value:
                    parent, tags = value.split(" ", 1)
                else:
                    parent = value
                    tags = ""
                rev, node = parent.split(":")
                
                remarks = []
                if tags:
                    if " (empty repository)" in tags:
                        remarks.append("@EMPTY@")
                        tags = tags.replace(" (empty repository)", "")
                    if " (no revision checked out)" in tags:
                        remarks.append("@NO_REVISION@")
                        tags = tags.replace(" (no revision checked out)", "")
                else:
                    tags = None
                
                value = infoDict.get(name, [])
                
                if rev == "-1":
                    value.append((int(rev), node, tags, None, remarks))
                else:
                    message = output.pop(0).strip()
                    value.append((int(rev), node, tags, message, remarks))
            elif name == "branch":
                pass
            elif name == "bookmarks":
                pass
            elif name == "commit":
                stateDict = {}
                if "(" in value:
                    if value.startswith("("):
                        states = ""
                        remark = value[1:-1]
                    else:
                        states, remark = value.rsplit(" (", 1)
                        remark = remark[:-1]
                else:
                    states = value
                    remark = ""
                states = states.split(", ")
                for state in states:
                    if state:
                        count, category = state.split(" ")
                        stateDict[category] = count
                value = (stateDict, remark)
            elif name == "update":
                if value.endswith("(current)"):
                    value = ("@CURRENT@", 0, 0)
                elif value.endswith("(update)"):
                    value = ("@UPDATE@", int(value.split(" ", 1)[0]), 0)
                elif value.endswith("(merge)"):
                    parts = value.split(", ")
                    value = ("@MERGE@", int(parts[0].split(" ", 1)[0]),
                             int(parts[1].split(" ", 1)[0]))
                else:
                    value = ("@UNKNOWN@", 0, 0)
            elif name == "remote":
                if value == "(synced)":
                    value = (0, 0, 0, 0)
                else:
                    inc = incb = outg = outgb = 0
                    for val in value.split(", "):
                        count, category = val.split(" ", 1)
                        if category == "outgoing":
                            outg = int(count)
                        elif category.endswith("incoming"):
                            inc = int(count)
                        elif category == "incoming bookmarks":
                            incb = int(count)
                        elif category == "outgoing bookmarks":
                            outgb = int(count)
                    value = (inc, outg, incb, outgb)
            elif name == "mq":
                if value == "(empty queue)":
                    value = (0, 0)
                else:
                    applied = unapplied = 0
                    for val in value.split(", "):
                        count, category = val.split(" ", 1)
                        if category == "applied":
                            applied = int(count)
                        elif category == "unapplied":
                            unapplied = int(count)
                    value = (applied, unapplied)
            elif name == "largefiles":
                if not value[0].isdigit():
                    value = 0
                else:
                    value = int(value.split(None, 1)[0])
            else:
                # ignore unknown entries
                continue
            
            infoDict[name] = value
        
        # step 2: build the output
        if infoDict:
            info = ["<table>"]
            pindex = 0
            for rev, node, tags, message, remarks in infoDict["parent"]:
                pindex += 1
                changeset = "{0}:{1}".format(rev, node)
                if len(infoDict["parent"]) > 1:
                    info.append(self.tr(
                        "<tr><td><b>Parent #{0}</b></td><td>{1}</td></tr>")
                        .format(pindex, changeset))
                else:
                    info.append(self.tr(
                        "<tr><td><b>Parent</b></td><td>{0}</td></tr>")
                        .format(changeset))
                if tags:
                    info.append(self.tr(
                        "<tr><td><b>Tags</b></td><td>{0}</td></tr>")
                        .format('<br/>'.join(tags.split())))
                if message:
                    info.append(self.tr(
                        "<tr><td><b>Commit Message</b></td><td>{0}</td></tr>")
                        .format(message))
                if remarks:
                    rem = []
                    if "@EMPTY@" in remarks:
                        rem.append(self.tr("empty repository"))
                    if "@NO_REVISION@" in remarks:
                        rem.append(self.tr("no revision checked out"))
                    info.append(self.tr(
                        "<tr><td><b>Remarks</b></td><td>{0}</td></tr>")
                        .format(", ".join(rem)))
            if "branch" in infoDict:
                info.append(self.tr(
                    "<tr><td><b>Branch</b></td><td>{0}</td></tr>")
                    .format(infoDict["branch"]))
            if "bookmarks" in infoDict:
                bookmarks = infoDict["bookmarks"].split()
                for i in range(len(bookmarks)):
                    if bookmarks[i].startswith("*"):
                        bookmarks[i] = "<b>{0}</b>".format(bookmarks[i])
                info.append(self.tr(
                    "<tr><td><b>Bookmarks</b></td><td>{0}</td></tr>")
                    .format('<br/>'.join(bookmarks)))
            if "commit" in infoDict:
                cinfo = []
                for category, count in infoDict["commit"][0].items():
                    if category == "modified":
                        cinfo.append(self.tr("{0} modified").format(count))
                    elif category == "added":
                        cinfo.append(self.tr("{0} added").format(count))
                    elif category == "removed":
                        cinfo.append(self.tr("{0} removed").format(count))
                    elif category == "renamed":
                        cinfo.append(self.tr("{0} renamed").format(count))
                    elif category == "copied":
                        cinfo.append(self.tr("{0} copied").format(count))
                    elif category == "deleted":
                        cinfo.append(self.tr("{0} deleted").format(count))
                    elif category == "unknown":
                        cinfo.append(self.tr("{0} unknown").format(count))
                    elif category == "ignored":
                        cinfo.append(self.tr("{0} ignored").format(count))
                    elif category == "unresolved":
                        cinfo.append(
                            self.tr("{0} unresolved").format(count))
                    elif category == "subrepos":
                        cinfo.append(self.tr("{0} subrepos").format(count))
                remark = infoDict["commit"][1]
                if remark == "merge":
                    cinfo.append(self.tr("Merge needed"))
                elif remark == "new branch":
                    cinfo.append(self.tr("New Branch"))
                elif remark == "head closed":
                    cinfo.append(self.tr("Head is closed"))
                elif remark == "clean":
                    cinfo.append(self.tr("No commit required"))
                elif remark == "new branch head":
                    cinfo.append(self.tr("New Branch Head"))
                info.append(self.tr(
                    "<tr><td><b>Commit Status</b></td><td>{0}</td></tr>")
                    .format("<br/>".join(cinfo)))
            if "update" in infoDict:
                if infoDict["update"][0] == "@CURRENT@":
                    uinfo = self.tr("current")
                elif infoDict["update"][0] == "@UPDATE@":
                    uinfo = self.tr(
                        "%n new changeset(s)<br/>Update required", "",
                        infoDict["update"][1])
                elif infoDict["update"][0] == "@MERGE@":
                    uinfo1 = self.tr(
                        "%n new changeset(s)", "", infoDict["update"][1])
                    uinfo2 = self.tr(
                        "%n branch head(s)", "", infoDict["update"][2])
                    uinfo = self.tr(
                        "{0}<br/>{1}<br/>Merge required",
                        "0 is changesets, 1 is branch heads")\
                        .format(uinfo1, uinfo2)
                else:
                    uinfo = self.tr("unknown status")
                info.append(self.tr(
                    "<tr><td><b>Update Status</b></td><td>{0}</td></tr>")
                    .format(uinfo))
            if "remote" in infoDict:
                if infoDict["remote"] == (0, 0, 0, 0):
                    rinfo = self.tr("synched")
                else:
                    li = []
                    if infoDict["remote"][0]:
                        li.append(self.tr("1 or more incoming changesets"))
                    if infoDict["remote"][1]:
                        li.append(self.tr("%n outgoing changeset(s)", "",
                                  infoDict["remote"][1]))
                    if infoDict["remote"][2]:
                        li.append(self.tr("%n incoming bookmark(s)", "",
                                  infoDict["remote"][2]))
                    if infoDict["remote"][3]:
                        li.append(self.tr("%n outgoing bookmark(s)", "",
                                  infoDict["remote"][3]))
                    rinfo = "<br/>".join(li)
                info.append(self.tr(
                    "<tr><td><b>Remote Status</b></td><td>{0}</td></tr>")
                    .format(rinfo))
            if "mq" in infoDict:
                if infoDict["mq"] == (0, 0):
                    qinfo = self.tr("empty queue")
                else:
                    li = []
                    if infoDict["mq"][0]:
                        li.append(self.tr("{0} applied")
                                  .format(infoDict["mq"][0]))
                    if infoDict["mq"][1]:
                        li.append(self.tr("{0} unapplied")
                                  .format(infoDict["mq"][1]))
                    qinfo = "<br/>".join(li)
                info.append(self.tr(
                    "<tr><td><b>Queues Status</b></td><td>{0}</td></tr>")
                    .format(qinfo))
            if "largefiles" in infoDict:
                if infoDict["largefiles"] == 0:
                    lfInfo = self.tr("No files to upload")
                else:
                    lfInfo = self.tr("%n file(s) to upload", "",
                                     infoDict["largefiles"])
                info.append(self.tr(
                    "<tr><td><b>Large Files</b></td><td>{0}</td></tr>")
                    .format(lfInfo))
            info.append("</table>")
        else:
            info = [self.tr("<p>No status information available.</p>")]
        
        self.summary.insertHtml("\n".join(info))
