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

# Copyright (c) 2006 - 2023 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the log viewer widget and the log widget.
"""

from PyQt6.QtCore import QRegularExpression, Qt, pyqtSignal
from PyQt6.QtGui import QBrush, QTextCursor, QTextDocument
from PyQt6.QtWidgets import (
    QApplication,
    QHBoxLayout,
    QMenu,
    QSizePolicy,
    QTextEdit,
    QWidget,
)

from eric7 import Preferences, Utilities
from eric7.EricGui import EricPixmapCache
from eric7.EricWidgets.EricApplication import ericApp

from .SearchWidget import SearchWidget


class LogViewer(QWidget):
    """
    Class implementing the containing widget for the log viewer.
    """

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

        @param ui reference to the main window (UserInterface)
        @param parent reference to the parent widget (QWidget)
        """
        super().__init__(parent)

        self.setWindowIcon(EricPixmapCache.getIcon("eric"))

        self.__ui = ui

        self.__logViewer = LogViewerEdit(self)
        self.__searchWidget = SearchWidget(self.__logViewer, self)
        self.__searchWidget.setSizePolicy(
            QSizePolicy.Policy.Fixed, QSizePolicy.Policy.Preferred
        )
        self.__searchWidget.hide()

        self.__layout = QHBoxLayout(self)
        self.__layout.setContentsMargins(1, 1, 1, 1)
        self.__layout.addWidget(self.__logViewer)
        self.__layout.addWidget(self.__searchWidget)

        self.__searchWidget.searchNext.connect(self.__logViewer.searchNext)
        self.__searchWidget.searchPrevious.connect(self.__logViewer.searchPrev)
        self.__logViewer.searchStringFound.connect(
            self.__searchWidget.searchStringFound
        )

    def appendToStdout(self, txt):
        """
        Public slot to appand text to the "stdout" tab.

        @param txt text to be appended (string)
        """
        added = self.__logViewer.appendToStdout(txt)
        if added:
            self.__ui.showLogViewer()

    def appendToStderr(self, txt):
        """
        Public slot to appand text to the "stderr" tab.

        @param txt text to be appended (string)
        """
        added = self.__logViewer.appendToStderr(txt)
        if added:
            self.__ui.showLogViewer()

    def preferencesChanged(self):
        """
        Public slot to handle a change of the preferences.
        """
        self.__logViewer.preferencesChanged()

    def showFind(self, txt=""):
        """
        Public method to display the search widget.

        @param txt text to be shown in the combo (string)
        """
        self.__searchWidget.showFind(txt)


class LogViewerEdit(QTextEdit):
    """
    Class providing a specialized text edit for displaying logging information.

    @signal searchStringFound(found) emitted to indicate the search result
        (boolean)
    """

    searchStringFound = pyqtSignal(bool)

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

        @param parent reference to the parent widget (QWidget)
        """
        super().__init__(parent)
        self.setAcceptRichText(False)
        self.setLineWrapMode(QTextEdit.LineWrapMode.NoWrap)
        self.setReadOnly(True)

        self.__mainWindow = parent
        self.__lastSearch = ()

        # create the context menu
        self.__menu = QMenu(self)
        self.__menu.addAction(self.tr("Clear"), self.clear)
        self.__menu.addAction(self.tr("Copy"), self.copy)
        self.__menu.addSeparator()
        self.__menu.addAction(self.tr("Find"), self.__find)
        self.__menu.addSeparator()
        self.__menu.addAction(self.tr("Select All"), self.selectAll)
        self.__menu.addSeparator()
        self.__menu.addAction(self.tr("Configure..."), self.__configure)

        self.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
        self.customContextMenuRequested.connect(self.__handleShowContextMenu)

        self.cNormalFormat = self.currentCharFormat()
        self.cErrorFormat = self.currentCharFormat()
        self.cErrorFormat.setForeground(QBrush(Preferences.getUI("LogStdErrColour")))

        self.__stdoutFilter = Preferences.getUI("LogViewerStdoutFilter")
        self.__stderrFilter = Preferences.getUI("LogViewerStderrFilter")
        self.__stdxxxFilter = Preferences.getUI("LogViewerStdxxxFilter")

    def __handleShowContextMenu(self, coord):
        """
        Private slot to show the context menu.

        @param coord the position of the mouse pointer (QPoint)
        """
        coord = self.mapToGlobal(coord)
        self.__menu.popup(coord)

    def __appendText(self, txt, isErrorMessage=False):
        """
        Private method to append text to the end.

        @param txt text to insert (string)
        @param isErrorMessage flag indicating to insert error text (boolean)
        """
        tc = self.textCursor()
        tc.movePosition(QTextCursor.MoveOperation.End)
        self.setTextCursor(tc)
        if isErrorMessage:
            self.setCurrentCharFormat(self.cErrorFormat)
        else:
            self.setCurrentCharFormat(self.cNormalFormat)
        self.insertPlainText(Utilities.filterAnsiSequences(txt))
        self.ensureCursorVisible()

    def __filterMessage(self, message, isErrorMessage=False):
        """
        Private method to filter messages.

        @param message message to be checked (string)
        @param isErrorMessage flag indicating to check an error message
            (boolean)
        @return flag indicating that the message should be filtered out
            (boolean)
        """
        message = Utilities.filterAnsiSequences(message)

        filters = (
            self.__stderrFilter + self.__stdxxxFilter
            if isErrorMessage
            else self.__stdoutFilter + self.__stdxxxFilter
        )

        return any(msgFilter in message for msgFilter in filters)

    def appendToStdout(self, txt):
        """
        Public slot to appand text to the "stdout" tab.

        @param txt text to be appended (string)
        @return flag indicating text was appended (boolean)
        """
        if self.__filterMessage(txt, isErrorMessage=False):
            return False

        self.__appendText(txt, isErrorMessage=False)
        QApplication.processEvents()
        return True

    def appendToStderr(self, txt):
        """
        Public slot to appand text to the "stderr" tab.

        @param txt text to be appended (string)
        @return flag indicating text was appended (boolean)
        """
        if self.__filterMessage(txt, isErrorMessage=True):
            return False

        self.__appendText(txt, isErrorMessage=True)
        QApplication.processEvents()
        return True

    def preferencesChanged(self):
        """
        Public slot to handle a change of the preferences.
        """
        self.cErrorFormat.setForeground(QBrush(Preferences.getUI("LogStdErrColour")))

        self.__stdoutFilter = Preferences.getUI("LogViewerStdoutFilter")
        self.__stderrFilter = Preferences.getUI("LogViewerStderrFilter")
        self.__stdxxxFilter = Preferences.getUI("LogViewerStdxxxFilter")

    def __configure(self):
        """
        Private method to open the configuration dialog.
        """
        ericApp().getObject("UserInterface").showPreferences("logViewerPage")

    def __find(self):
        """
        Private slot to show the find widget.
        """
        txt = self.textCursor().selectedText()
        self.__mainWindow.showFind(txt)

    def searchNext(self, txt, caseSensitive, wholeWord, regexp):
        """
        Public method to search the next occurrence of the given text.

        @param txt text to search for
        @type str
        @param caseSensitive flag indicating to perform a case sensitive
            search
        @type bool
        @param wholeWord flag indicating to search for whole words
            only
        @type bool
        @param regexp flag indicating a regular expression search
        @type bool
        """
        self.__lastSearch = (txt, caseSensitive, wholeWord, regexp)
        flags = QTextDocument.FindFlag(0)
        if caseSensitive:
            flags |= QTextDocument.FindFlag.FindCaseSensitively
        if wholeWord:
            flags |= QTextDocument.FindFlag.FindWholeWords
        ok = (
            self.find(
                QRegularExpression(
                    txt,
                    QRegularExpression.PatternOption.NoPatternOption
                    if caseSensitive
                    else QRegularExpression.PatternOption.CaseInsensitiveOption,
                ),
                flags,
            )
            if regexp
            else self.find(txt, flags)
        )
        self.searchStringFound.emit(ok)

    def searchPrev(self, txt, caseSensitive, wholeWord, regexp):
        """
        Public method to search the previous occurrence of the given text.

        @param txt text to search for
        @type str
        @param caseSensitive flag indicating to perform a case sensitive
            search
        @type bool
        @param wholeWord flag indicating to search for whole words
            only
        @type bool
        @param regexp flag indicating a regular expression search
        @type bool
        """
        self.__lastSearch = (txt, caseSensitive, wholeWord, regexp)
        flags = QTextDocument.FindFlag.FindBackward
        if caseSensitive:
            flags |= QTextDocument.FindFlag.FindCaseSensitively
        if wholeWord:
            flags |= QTextDocument.FindFlag.FindWholeWords
        ok = (
            self.find(
                QRegularExpression(
                    txt,
                    QRegularExpression.PatternOption.NoPatternOption
                    if caseSensitive
                    else QRegularExpression.PatternOption.CaseInsensitiveOption,
                ),
                flags,
            )
            if regexp
            else self.find(txt, flags)
        )
        self.searchStringFound.emit(ok)

    def keyPressEvent(self, evt):
        """
        Protected method handling key press events.

        @param evt key press event (QKeyEvent)
        """
        if evt.modifiers() == Qt.KeyboardModifier.ControlModifier:
            if evt.key() == Qt.Key.Key_F:
                self.__find()
                evt.accept()
                return
            elif evt.key() == Qt.Key.Key_C:
                self.copy()
                evt.accept()
                return
            elif evt.key() == Qt.Key.Key_A:
                self.selectAll()
                evt.accept()
                return
        elif (
            evt.modifiers() == Qt.KeyboardModifier.NoModifier
            and evt.key() == Qt.Key.Key_F3
            and self.__lastSearch
        ):
            self.searchNext(*self.__lastSearch)
            evt.accept()
            return
        elif (
            evt.modifiers() == Qt.KeyboardModifier.ShiftModifier
            and evt.key() == Qt.Key.Key_F3
            and self.__lastSearch
        ):
            self.searchPrev(*self.__lastSearch)
            evt.accept()
            return
