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

# Copyright (c) 2003 - 2013 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to show the output of the svn diff command process.
"""

import os
import sys
import types

import pysvn

from PyQt4.QtCore import *
from PyQt4.QtGui import *

from KdeQt import KQFileDialog, KQMessageBox
from KdeQt.KQApplication import e4App

from SvnDialogMixin import SvnDialogMixin
from Ui_SvnDiffDialog import Ui_SvnDiffDialog

import Utilities

class SvnDiffDialog(QWidget, SvnDialogMixin, Ui_SvnDiffDialog):
    """
    Class implementing a dialog to show the output of the svn diff command.
    """
    def __init__(self, vcs, parent = None):
        """
        Constructor
        
        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        QWidget.__init__(self, parent)
        self.setupUi(self)
        SvnDialogMixin.__init__(self)
        
        self.buttonBox.button(QDialogButtonBox.Save).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self.vcs = vcs
        
        if Utilities.isWindowsPlatform():
            self.contents.setFontFamily("Lucida Console")
        else:
            self.contents.setFontFamily("Monospace")
        
        self.cNormalFormat = self.contents.currentCharFormat()
        self.cAddedFormat = self.contents.currentCharFormat()
        self.cAddedFormat.setBackground(QBrush(QColor(190, 237, 190)))
        self.cRemovedFormat = self.contents.currentCharFormat()
        self.cRemovedFormat.setBackground(QBrush(QColor(237, 190, 190)))
        self.cLineNoFormat = self.contents.currentCharFormat()
        self.cLineNoFormat.setBackground(QBrush(QColor(255, 220, 168)))
        
        self.client = self.vcs.getClient()
        self.client.callback_cancel = \
            self._clientCancelCallback
        self.client.callback_get_login = \
            self._clientLoginCallback
        self.client.callback_ssl_server_trust_prompt = \
            self._clientSslServerTrustPromptCallback
        
    def __getVersionArg(self, version):
        """
        Private method to get a pysvn revision object for the given version number.
        
        @param version revision (integer or string)
        @return revision object (pysvn.Revision)
        """
        if type(version) == type(1) or type(version) == type(1L):
            return pysvn.Revision(pysvn.opt_revision_kind.number, version)
        elif version.startswith("{"):
            dateStr = version[1:-1]
            secs = QDateTime.fromString(dateStr, Qt.ISODate).toTime_t()
            return pysvn.Revision(pysvn.opt_revision_kind.date, secs)
        elif version == "HEAD":
            return pysvn.Revision(pysvn.opt_revision_kind.head)
        elif version == "COMMITTED":
            return pysvn.Revision(pysvn.opt_revision_kind.committed)
        elif version == "BASE":
            return pysvn.Revision(pysvn.opt_revision_kind.base)
        elif version == "WORKING":
            return pysvn.Revision(pysvn.opt_revision_kind.working)
        elif version == "PREV":
            return pysvn.Revision(pysvn.opt_revision_kind.previous)
        else:
            return pysvn.Revision(pysvn.opt_revision_kind.unspecified)
        
    def __getDiffSummaryKind(self, summaryKind):
        """
        Private method to get a string descripion of the diff summary.
        
        @param summaryKind (pysvn.diff_summarize.summarize_kind)
        @return one letter string indicating the change type (QString)
        """
        if summaryKind == pysvn.diff_summarize_kind.delete:
            return "D"
        elif summaryKind == pysvn.diff_summarize_kind.modified:
            return "M"
        elif summaryKind == pysvn.diff_summarize_kind.added:
            return "A"
        elif summaryKind == pysvn.diff_summarize_kind.normal:
            return "N"
        else:
            return " "
        
    def start(self, fn, versions = None, urls = None, summary = False, pegRev = None):
        """
        Public slot to start the svn diff command.
        
        @param fn filename to be diffed (string)
        @param versions list of versions to be diffed (list of up to 2 integer or None)
        @keyparam urls list of repository URLs (list of 2 strings)
        @keyparam summary flag indicating a summarizing diff 
            (only valid for URL diffs) (boolean)
        @keyparam pegRev revision number the filename is valid (integer)
        """
        self.buttonBox.button(QDialogButtonBox.Save).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Cancel).setDefault(True)
        
        self._reset()
        self.errorGroup.hide()
        
        QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
        QApplication.processEvents()
        self.filename = fn
        
        self.contents.clear()
        self.paras = 0
        
        if Utilities.hasEnvironmentEntry('TEMP'):
            tmpdir = Utilities.getEnvironmentEntry('TEMP')
        elif Utilities.hasEnvironmentEntry('TMPDIR'):
            tmpdir = Utilities.getEnvironmentEntry('TMPDIR')
        elif Utilities.hasEnvironmentEntry('TMP'):
            tmpdir = Utilities.getEnvironmentEntry('TMP')
        elif os.path.exists('/var/tmp'):
            tmpdir = '/var/tmp'
        elif os.path.exists('/usr/tmp'):
            tmpdir = '/usr/tmp'
        elif os.path.exists('/tmp'):
            tmpdir = '/tmp'
        else:
            KQMessageBox.critical(self,
                self.trUtf8("Subversion Diff"),
                self.trUtf8("""There is no temporary directory available."""))
            return
        
        tmpdir = os.path.join(tmpdir, 'svn_tmp')
        if not os.path.exists(tmpdir):
            os.mkdir(tmpdir)
        
        opts = self.vcs.options['global'] + self.vcs.options['diff']
        recurse = "--non-recursive" not in opts
        
        if versions is not None:
            self.raise_()
            self.activateWindow()
            rev1 = self.__getVersionArg(versions[0])
            if len(versions) == 1:
                rev2 = self.__getVersionArg("WORKING")
            else:
                rev2 = self.__getVersionArg(versions[1])
        else:
            rev1 = self.__getVersionArg("BASE")
            rev2 = self.__getVersionArg("WORKING")
        
        if urls is not None:
            rev1 = self.__getVersionArg("HEAD")
            rev2 = self.__getVersionArg("HEAD")
        
        if type(fn) is types.ListType:
            dname, fnames = self.vcs.splitPathList(fn)
        else:
            dname, fname = self.vcs.splitPath(fn)
            fnames = [fname]
        
        locker = QMutexLocker(self.vcs.vcsExecutionMutex)
        cwd = os.getcwd()
        os.chdir(dname)
        try:
            dname = e4App().getObject('Project').getRelativePath(dname)
            if dname:
                dname += "/"
            for name in fnames:
                self.__showError(self.trUtf8("Processing file '%1'...\n").arg(name))
                if urls is not None:
                    url1 = "%s/%s%s" % (urls[0], dname, name)
                    url2 = "%s/%s%s" % (urls[1], dname, name)
                    if summary:
                        diff_summary = self.client.diff_summarize(\
                            url1, revision1 = rev1, 
                            url_or_path2 = url2, revision2 = rev2, 
                            recurse = recurse)
                        diff_list = []
                        for diff_sum in diff_summary:
                            diff_list.append("%s %s" % \
                                (self.__getDiffSummaryKind(diff_sum['summarize_kind']),
                                 diff_sum['path']))
                        diffText = os.linesep.join(diff_list)
                    else:
                        diffText = self.client.diff(tmpdir, 
                            url1, revision1 = rev1, 
                            url_or_path2 = url2, revision2 = rev2, 
                            recurse = recurse)
                else:
                    if pegRev is not None:
                        diffText = self.client.diff_peg(tmpdir, name, 
                            peg_revision = self.__getVersionArg(pegRev), 
                            revision_start = rev1, revision_end = rev2, recurse = recurse)
                    else:
                        diffText = self.client.diff(tmpdir, name, 
                            revision1 = rev1, revision2 = rev2, recurse = recurse)
                counter = 0
                for line in diffText.splitlines():
                    self.__appendText("%s%s" % (line, os.linesep))
                    counter += 1
                    if counter == 30:
                        # check for cancel every 30 lines
                        counter = 0
                        if self._clientCancelCallback():
                            break
                if self._clientCancelCallback():
                    break
        except pysvn.ClientError, e:
            self.__showError(e.args[0])
        locker.unlock()
        os.chdir(cwd)
        self.__finish()
        
        if self.paras == 0:
            self.contents.insertPlainText(\
                self.trUtf8('There is no difference.'))
            return
        
        self.buttonBox.button(QDialogButtonBox.Save).setEnabled(True)
        
    def __appendText(self, line):
        """
        Private method to append text to the end of the contents pane.
        
        @param line line of text to insert (string)
        """
        if line.startswith('+') or line.startswith('>') or line.startswith('A '):
            format = self.cAddedFormat
        elif line.startswith('-') or line.startswith('<') or line.startswith('D '):
            format = self.cRemovedFormat
        elif line.startswith('@@'):
            format = self.cLineNoFormat
        else:
            format = self.cNormalFormat
        
        tc = self.contents.textCursor()
        tc.movePosition(QTextCursor.End)
        self.contents.setTextCursor(tc)
        self.contents.setCurrentCharFormat(format)
        self.contents.insertPlainText(line)
        self.paras += 1
        
    def __finish(self):
        """
        Private slot called when the user pressed the button.
        """
        QApplication.restoreOverrideCursor()
        
        self.buttonBox.button(QDialogButtonBox.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.Close).setDefault(True)
        
        tc = self.contents.textCursor()
        tc.movePosition(QTextCursor.Start)
        self.contents.setTextCursor(tc)
        self.contents.ensureCursorVisible()
        
        self._cancel()
        
    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.buttonBox.button(QDialogButtonBox.Save):
            self.on_saveButton_clicked()
        
    @pyqtSignature("")
    def on_saveButton_clicked(self):
        """
        Private slot to handle the Save button press.
        
        It saves the diff shown in the dialog to a file in the local
        filesystem.
        """
        if type(self.filename) is types.ListType:
            if len(self.filename) > 1:
                fname = self.vcs.splitPathList(self.filename)[0]
            else:
                dname, fname = self.vcs.splitPath(self.filename[0])
                if fname != '.':
                    fname = "%s.diff" % self.filename[0]
                else:
                    fname = dname
        else:
            fname = self.vcs.splitPath(self.filename)[0]
        
        selectedFilter = QString("")
        fname = KQFileDialog.getSaveFileName(\
            self,
            self.trUtf8("Save Diff"),
            fname,
            self.trUtf8("Patch Files (*.diff)"),
            selectedFilter,
            QFileDialog.Options(QFileDialog.DontConfirmOverwrite))
        
        if fname.isEmpty():
            return
        
        ext = QFileInfo(fname).suffix()
        if ext.isEmpty():
            ex = selectedFilter.section('(*',1,1).section(')',0,0)
            if not ex.isEmpty():
                fname.append(ex)
        if QFileInfo(fname).exists():
            res = KQMessageBox.warning(self,
                self.trUtf8("Save Diff"),
                self.trUtf8("<p>The patch file <b>%1</b> already exists.</p>")
                    .arg(fname),
                QMessageBox.StandardButtons(\
                    QMessageBox.Abort | \
                    QMessageBox.Save),
                QMessageBox.Abort)
            if res != QMessageBox.Save:
                return
        fname = unicode(Utilities.toNativeSeparators(fname))
        
        try:
            f = open(fname, "wb")
            f.write(unicode(self.contents.toPlainText()))
            f.close()
        except IOError, why:
            KQMessageBox.critical(self, self.trUtf8('Save Diff'),
                self.trUtf8('<p>The patch file <b>%1</b> could not be saved.'
                    '<br>Reason: %2</p>')
                    .arg(unicode(fname)).arg(str(why)))
        
    def __showError(self, msg):
        """
        Private slot to show an error message.
        
        @param msg error message to show (string or QString)
        """
        self.errorGroup.show()
        self.errors.insertPlainText(msg)
        self.errors.ensureCursorVisible()
