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

# Copyright (c) 2007 - 2023 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to browse the log history.
"""

import os
import re

import pysvn

from PyQt6.QtCore import QDate, QPoint, Qt, pyqtSlot
from PyQt6.QtWidgets import (
    QApplication,
    QDialogButtonBox,
    QHeaderView,
    QTreeWidgetItem,
    QWidget,
)

from eric7.EricGui import EricPixmapCache
from eric7.EricGui.EricOverrideCursor import EricOverrideCursor
from eric7.EricUtilities.EricMutexLocker import EricMutexLocker
from eric7.EricWidgets import EricMessageBox

from .SvnDialogMixin import SvnDialogMixin
from .SvnUtilities import dateFromTime_t, formatTime
from .Ui_SvnLogBrowserDialog import Ui_SvnLogBrowserDialog


class SvnLogBrowserDialog(QWidget, SvnDialogMixin, Ui_SvnLogBrowserDialog):
    """
    Class implementing a dialog to browse the log history.
    """

    def __init__(self, vcs, parent=None):
        """
        Constructor

        @param vcs reference to the vcs object
        @param parent parent widget (QWidget)
        """
        super().__init__(parent)
        self.setupUi(self)
        SvnDialogMixin.__init__(self)

        self.__position = QPoint()

        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setDefault(True)

        self.upButton.setIcon(EricPixmapCache.getIcon("1uparrow"))
        self.downButton.setIcon(EricPixmapCache.getIcon("1downarrow"))

        self.filesTree.headerItem().setText(self.filesTree.columnCount(), "")
        self.filesTree.header().setSortIndicator(0, Qt.SortOrder.AscendingOrder)

        self.vcs = vcs

        self.__initData()

        self.fromDate.setDisplayFormat("yyyy-MM-dd")
        self.toDate.setDisplayFormat("yyyy-MM-dd")
        self.__resetUI()

        self.__messageRole = Qt.ItemDataRole.UserRole
        self.__changesRole = Qt.ItemDataRole.UserRole + 1

        self.flags = {
            "A": self.tr("Added"),
            "D": self.tr("Deleted"),
            "M": self.tr("Modified"),
            "R": self.tr("Replaced"),
        }

        self.__logTreeNormalFont = self.logTree.font()
        self.__logTreeNormalFont.setBold(False)
        self.__logTreeBoldFont = self.logTree.font()
        self.__logTreeBoldFont.setBold(True)

        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 __initData(self):
        """
        Private method to (re-)initialize some data.
        """
        self.__maxDate = QDate()
        self.__minDate = QDate()
        self.__filterLogsEnabled = True

        self.diff = None
        self.__lastRev = 0

    def closeEvent(self, e):
        """
        Protected slot implementing a close event handler.

        @param e close event (QCloseEvent)
        """
        self.__position = self.pos()

        e.accept()

    def show(self):
        """
        Public slot to show the dialog.
        """
        if not self.__position.isNull():
            self.move(self.__position)
        self.__resetUI()

        super().show()

    def __resetUI(self):
        """
        Private method to reset the user interface.
        """
        self.fromDate.setDate(QDate.currentDate())
        self.toDate.setDate(QDate.currentDate())
        self.fieldCombo.setCurrentIndex(self.fieldCombo.findText(self.tr("Message")))
        self.limitSpinBox.setValue(self.vcs.getPlugin().getPreferences("LogLimit"))
        self.stopCheckBox.setChecked(
            self.vcs.getPlugin().getPreferences("StopLogOnCopy")
        )

        self.logTree.clear()

        self.nextButton.setEnabled(True)
        self.limitSpinBox.setEnabled(True)

    def _reset(self):
        """
        Protected method to reset the internal state of the dialog.
        """
        SvnDialogMixin._reset(self)

        self.cancelled = False

        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setDefault(True)
        QApplication.processEvents()

    def __resizeColumnsLog(self):
        """
        Private method to resize the log tree columns.
        """
        self.logTree.header().resizeSections(QHeaderView.ResizeMode.ResizeToContents)
        self.logTree.header().setStretchLastSection(True)

    def __resortLog(self):
        """
        Private method to resort the log tree.
        """
        self.logTree.sortItems(
            self.logTree.sortColumn(), self.logTree.header().sortIndicatorOrder()
        )

    def __resizeColumnsFiles(self):
        """
        Private method to resize the changed files tree columns.
        """
        self.filesTree.header().resizeSections(QHeaderView.ResizeMode.ResizeToContents)
        self.filesTree.header().setStretchLastSection(True)

    def __resortFiles(self):
        """
        Private method to resort the changed files tree.
        """
        sortColumn = self.filesTree.sortColumn()
        self.filesTree.sortItems(1, self.filesTree.header().sortIndicatorOrder())
        self.filesTree.sortItems(
            sortColumn, self.filesTree.header().sortIndicatorOrder()
        )

    def __generateLogItem(self, author, date, message, revision, changedPaths):
        """
        Private method to generate a log tree entry.

        @param author author info (string)
        @param date date info (integer)
        @param message text of the log message (string)
        @param revision revision info (string or pysvn.opt_revision_kind)
        @param changedPaths list of pysvn dictionary like objects containing
            info about the changed files/directories
        @return reference to the generated item (QTreeWidgetItem)
        """
        if revision == "":
            rev = ""
            self.__lastRev = 0
        else:
            rev = revision.number
            self.__lastRev = revision.number
        dt = formatTime(date) if date else ""

        itm = QTreeWidgetItem(self.logTree)
        itm.setData(0, Qt.ItemDataRole.DisplayRole, rev)
        itm.setData(1, Qt.ItemDataRole.DisplayRole, author)
        itm.setData(2, Qt.ItemDataRole.DisplayRole, dt)
        itm.setData(3, Qt.ItemDataRole.DisplayRole, " ".join(message.splitlines()))

        changes = []
        for changedPath in changedPaths:
            copyPath = (
                ""
                if changedPath["copyfrom_path"] is None
                else changedPath["copyfrom_path"]
            )
            copyRev = (
                ""
                if changedPath["copyfrom_revision"] is None
                else "{0:7d}".format(changedPath["copyfrom_revision"].number)
            )
            change = {
                "action": changedPath["action"],
                "path": changedPath["path"],
                "copyfrom_path": copyPath,
                "copyfrom_revision": copyRev,
            }
            changes.append(change)
        itm.setData(0, self.__messageRole, message)
        itm.setData(0, self.__changesRole, changes)

        itm.setTextAlignment(0, Qt.AlignmentFlag.AlignRight)
        itm.setTextAlignment(1, Qt.AlignmentFlag.AlignLeft)
        itm.setTextAlignment(2, Qt.AlignmentFlag.AlignLeft)
        itm.setTextAlignment(3, Qt.AlignmentFlag.AlignLeft)
        itm.setTextAlignment(4, Qt.AlignmentFlag.AlignLeft)

        return itm

    def __generateFileItem(self, action, path, copyFrom, copyRev):
        """
        Private method to generate a changed files tree entry.

        @param action indicator for the change action ("A", "D" or "M")
        @param path path of the file in the repository (string)
        @param copyFrom path the file was copied from (None, string)
        @param copyRev revision the file was copied from (None, string)
        @return reference to the generated item (QTreeWidgetItem)
        """
        itm = QTreeWidgetItem(
            self.filesTree, [self.flags[action], path, copyFrom, copyRev]
        )

        itm.setTextAlignment(3, Qt.AlignmentFlag.AlignRight)

        return itm

    def __getLogEntries(self, startRev=None):
        """
        Private method to retrieve log entries from the repository.

        @param startRev revision number to start from (integer, string)
        """
        fetchLimit = 10
        self._reset()

        limit = self.limitSpinBox.value()
        if startRev is None:
            start = pysvn.Revision(pysvn.opt_revision_kind.head)
        else:
            try:
                start = pysvn.Revision(pysvn.opt_revision_kind.number, int(startRev))
            except TypeError:
                start = pysvn.Revision(pysvn.opt_revision_kind.head)

        with EricOverrideCursor():
            cwd = os.getcwd()
            os.chdir(self.dname)
            try:
                nextRev = 0
                fetched = 0
                logs = []
                with EricMutexLocker(self.vcs.vcsExecutionMutex):
                    while fetched < limit:
                        flimit = min(fetchLimit, limit - fetched)
                        revstart = (
                            start
                            if fetched == 0
                            else pysvn.Revision(pysvn.opt_revision_kind.number, nextRev)
                        )
                        allLogs = self.client.log(
                            self.fname,
                            revision_start=revstart,
                            discover_changed_paths=True,
                            limit=flimit + 1,
                            strict_node_history=self.stopCheckBox.isChecked(),
                        )
                        if len(allLogs) <= flimit or self._clientCancelCallback():
                            logs.extend(allLogs)
                            break
                        else:
                            logs.extend(allLogs[:-1])
                            nextRev = allLogs[-1]["revision"].number
                            fetched += fetchLimit

                for log in logs:
                    author = log["author"]
                    message = log["message"]
                    self.__generateLogItem(
                        author,
                        log["date"],
                        message,
                        log["revision"],
                        log["changed_paths"],
                    )
                    dt = dateFromTime_t(log["date"])
                    if not self.__maxDate.isValid() and not self.__minDate.isValid():
                        self.__maxDate = dt
                        self.__minDate = dt
                    else:
                        if self.__maxDate < dt:
                            self.__maxDate = dt
                        if self.__minDate > dt:
                            self.__minDate = dt
                if len(logs) < limit and not self.cancelled:
                    self.nextButton.setEnabled(False)
                    self.limitSpinBox.setEnabled(False)
                self.__filterLogsEnabled = False
                self.fromDate.setMinimumDate(self.__minDate)
                self.fromDate.setMaximumDate(self.__maxDate)
                self.fromDate.setDate(self.__minDate)
                self.toDate.setMinimumDate(self.__minDate)
                self.toDate.setMaximumDate(self.__maxDate)
                self.toDate.setDate(self.__maxDate)
                self.__filterLogsEnabled = True

                self.__resizeColumnsLog()
                self.__resortLog()
                self.__filterLogs()
            except pysvn.ClientError as e:
                self.__showError(e.args[0])
            os.chdir(cwd)
        self.__finish()

    def start(self, fn, isFile=False):
        """
        Public slot to start the svn log command.

        @param fn filename to show the log for (string)
        @param isFile flag indicating log for a file is to be shown
            (boolean)
        """
        self.sbsCheckBox.setEnabled(isFile)
        self.sbsCheckBox.setVisible(isFile)

        self.__initData()

        self.filename = fn
        self.dname, self.fname = self.vcs.splitPath(fn)

        self.activateWindow()
        self.raise_()

        self.logTree.clear()
        self.__getLogEntries()
        self.logTree.setCurrentItem(self.logTree.topLevelItem(0))

    def __finish(self):
        """
        Private slot called when the user pressed the button.
        """
        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setEnabled(True)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).setEnabled(False)
        self.buttonBox.button(QDialogButtonBox.StandardButton.Close).setDefault(True)

        self._cancel()

    def __diffRevisions(self, rev1, rev2, peg_rev):
        """
        Private method to do a diff of two revisions.

        @param rev1 first revision number (integer)
        @param rev2 second revision number (integer)
        @param peg_rev revision number to use as a reference (integer)
        """
        from .SvnDiffDialog import SvnDiffDialog

        if self.sbsCheckBox.isEnabled() and self.sbsCheckBox.isChecked():
            self.vcs.vcsSbsDiff(self.filename, revisions=(str(rev1), str(rev2)))
        else:
            if self.diff is None:
                self.diff = SvnDiffDialog(self.vcs)
            self.diff.show()
            self.diff.raise_()
            QApplication.processEvents()
            self.diff.start(self.filename, [rev1, rev2], pegRev=peg_rev)

    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.StandardButton.Close):
            self.close()
        elif button == self.buttonBox.button(QDialogButtonBox.StandardButton.Cancel):
            self.cancelled = True
            self.__finish()

    @pyqtSlot(QTreeWidgetItem, QTreeWidgetItem)
    def on_logTree_currentItemChanged(self, current, previous):
        """
        Private slot called, when the current item of the log tree changes.

        @param current reference to the new current item (QTreeWidgetItem)
        @param previous reference to the old current item (QTreeWidgetItem)
        """
        if current is not None:
            self.messageEdit.setPlainText(current.data(0, self.__messageRole))

            self.filesTree.clear()
            changes = current.data(0, self.__changesRole)
            if len(changes) > 0:
                for change in changes:
                    self.__generateFileItem(
                        change["action"],
                        change["path"],
                        change["copyfrom_path"],
                        change["copyfrom_revision"],
                    )
                self.__resizeColumnsFiles()
                self.__resortFiles()

        self.diffPreviousButton.setEnabled(
            current != self.logTree.topLevelItem(self.logTree.topLevelItemCount() - 1)
        )

        # Highlight the current entry using a bold font
        for col in range(self.logTree.columnCount()):
            current and current.setFont(col, self.__logTreeBoldFont)
            previous and previous.setFont(col, self.__logTreeNormalFont)

        # set the state of the up and down buttons
        self.upButton.setEnabled(
            current is not None and self.logTree.indexOfTopLevelItem(current) > 0
        )
        self.downButton.setEnabled(current is not None and int(current.text(0)) > 1)

    @pyqtSlot()
    def on_logTree_itemSelectionChanged(self):
        """
        Private slot called, when the selection has changed.
        """
        self.diffRevisionsButton.setEnabled(len(self.logTree.selectedItems()) == 2)

    @pyqtSlot()
    def on_nextButton_clicked(self):
        """
        Private slot to handle the Next button.
        """
        if self.__lastRev > 1:
            self.__getLogEntries(self.__lastRev - 1)

    @pyqtSlot()
    def on_diffPreviousButton_clicked(self):
        """
        Private slot to handle the Diff to Previous button.
        """
        itm = self.logTree.topLevelItem(0)
        if itm is None:
            self.diffPreviousButton.setEnabled(False)
            return
        peg_rev = int(itm.text(0))

        itm = self.logTree.currentItem()
        if itm is None:
            self.diffPreviousButton.setEnabled(False)
            return
        rev2 = int(itm.text(0))

        itm = self.logTree.topLevelItem(self.logTree.indexOfTopLevelItem(itm) + 1)
        if itm is None:
            self.diffPreviousButton.setEnabled(False)
            return
        rev1 = int(itm.text(0))

        self.__diffRevisions(rev1, rev2, peg_rev)

    @pyqtSlot()
    def on_diffRevisionsButton_clicked(self):
        """
        Private slot to handle the Compare Revisions button.
        """
        items = self.logTree.selectedItems()
        if len(items) != 2:
            self.diffRevisionsButton.setEnabled(False)
            return

        rev2 = int(items[0].text(0))
        rev1 = int(items[1].text(0))

        itm = self.logTree.topLevelItem(0)
        if itm is None:
            self.diffPreviousButton.setEnabled(False)
            return
        peg_rev = int(itm.text(0))

        self.__diffRevisions(min(rev1, rev2), max(rev1, rev2), peg_rev)

    def __showError(self, msg):
        """
        Private slot to show an error message.

        @param msg error message to show (string)
        """
        EricMessageBox.critical(self, self.tr("Subversion Error"), msg)

    @pyqtSlot(QDate)
    def on_fromDate_dateChanged(self, date):
        """
        Private slot called, when the from date changes.

        @param date new date (QDate)
        """
        self.__filterLogs()

    @pyqtSlot(QDate)
    def on_toDate_dateChanged(self, date):
        """
        Private slot called, when the from date changes.

        @param date new date (QDate)
        """
        self.__filterLogs()

    @pyqtSlot(int)
    def on_fieldCombo_activated(self, index):
        """
        Private slot called, when a new filter field is selected.

        @param index index of the selected entry
        @type int
        """
        self.__filterLogs()

    @pyqtSlot(str)
    def on_rxEdit_textChanged(self, txt):
        """
        Private slot called, when a filter expression is entered.

        @param txt filter expression (string)
        """
        self.__filterLogs()

    def __filterLogs(self):
        """
        Private method to filter the log entries.
        """
        if self.__filterLogsEnabled:
            from_ = self.fromDate.date().toString("yyyy-MM-dd")
            to_ = self.toDate.date().addDays(1).toString("yyyy-MM-dd")
            txt = self.fieldCombo.currentText()
            if txt == self.tr("Author"):
                fieldIndex = 1
                searchRx = re.compile(self.rxEdit.text(), re.IGNORECASE)
            elif txt == self.tr("Revision"):
                fieldIndex = 0
                txt = self.rxEdit.text()
                if txt.startswith("^"):
                    searchRx = re.compile(r"^\s*{0}".format(txt[1:]), re.IGNORECASE)
                else:
                    searchRx = re.compile(txt, re.IGNORECASE)
            else:
                fieldIndex = 3
                searchRx = re.compile(self.rxEdit.text(), re.IGNORECASE)

            currentItem = self.logTree.currentItem()
            for topIndex in range(self.logTree.topLevelItemCount()):
                topItem = self.logTree.topLevelItem(topIndex)
                if (
                    topItem.text(2) <= to_
                    and topItem.text(2) >= from_
                    and searchRx.search(topItem.text(fieldIndex)) is not None
                ):
                    topItem.setHidden(False)
                    if topItem is currentItem:
                        self.on_logTree_currentItemChanged(topItem, None)
                else:
                    topItem.setHidden(True)
                    if topItem is currentItem:
                        self.messageEdit.clear()
                        self.filesTree.clear()

    @pyqtSlot(bool)
    def on_stopCheckBox_clicked(self, checked):
        """
        Private slot called, when the stop on copy/move checkbox is clicked.

        @param checked flag indicating the check box state (boolean)
        """
        self.vcs.getPlugin().setPreferences(
            "StopLogOnCopy", int(self.stopCheckBox.isChecked())
        )
        self.nextButton.setEnabled(True)
        self.limitSpinBox.setEnabled(True)

    @pyqtSlot()
    def on_upButton_clicked(self):
        """
        Private slot to move the current item up one entry.
        """
        itm = self.logTree.itemAbove(self.logTree.currentItem())
        if itm:
            self.logTree.setCurrentItem(itm)

    @pyqtSlot()
    def on_downButton_clicked(self):
        """
        Private slot to move the current item down one entry.
        """
        itm = self.logTree.itemBelow(self.logTree.currentItem())
        if itm:
            self.logTree.setCurrentItem(itm)
        else:
            # load the next bunch and try again
            self.on_nextButton_clicked()
            self.on_downButton_clicked()
