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

# Copyright (c) 2004 - 2024 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to search for files.
"""

import os
import sys

from PyQt6.QtCore import Qt, QUrl, pyqtSignal, pyqtSlot
from PyQt6.QtGui import QDesktopServices, QImageReader
from PyQt6.QtWidgets import (
    QApplication,
    QDialog,
    QDialogButtonBox,
    QHeaderView,
    QTreeWidgetItem,
    QVBoxLayout,
    QWidget,
)

from eric7 import Utilities
from eric7.EricGui import EricPixmapCache
from eric7.EricWidgets.EricPathPicker import EricPathPickerModes
from eric7.SystemUtilities import FileSystemUtilities

from .Ui_FindLocationWidget import Ui_FindLocationWidget


class FindLocationWidget(QWidget, Ui_FindLocationWidget):
    """
    Class implementing a widget to search for files.

    The occurrences found are displayed in a QTreeWidget showing the
    filename and the pathname. The file will be opened upon a double click
    onto the respective entry of the list or by pressing the open button.

    @signal sourceFile(str) emitted to open a file in the editor
    @signal designerFile(str) emitted to open a Qt-Designer file
    @signal linguistFile(str) emitted to open a Qt-Linguist (*.ts) file
    @signal trpreview([str]) emitted to preview Qt-Linguist (*.qm) files
    @signal pixmapFile(str) emitted to open a pixmap file
    @signal svgFile(str) emitted to open a SVG file
    @signal umlFile(str) emitted to open an eric UML file
    """

    sourceFile = pyqtSignal(str)
    designerFile = pyqtSignal(str)
    linguistFile = pyqtSignal(str)
    trpreview = pyqtSignal(list)
    pixmapFile = pyqtSignal(str)
    svgFile = pyqtSignal(str)
    umlFile = pyqtSignal(str)

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

        @param project reference to the project object
        @type Project
        @param parent parent widget of this dialog
        @type QWidget
        """
        super().__init__(parent)
        self.setupUi(self)

        self.layout().setContentsMargins(0, 3, 0, 0)

        self.searchDirPicker.setMode(EricPathPickerModes.DIRECTORY_MODE)

        self.fileList.headerItem().setText(self.fileList.columnCount(), "")

        self.stopButton.setEnabled(False)
        self.stopButton.setIcon(EricPixmapCache.getIcon("stopLoading"))
        self.stopButton.setAutoDefault(False)
        self.stopButton.clicked.connect(self.__stopSearch)

        self.findButton.setIcon(EricPixmapCache.getIcon("find"))
        self.findButton.setAutoDefault(False)
        self.findButton.clicked.connect(self.__searchFile)

        self.clearButton.setEnabled(False)
        self.clearButton.setIcon(EricPixmapCache.getIcon("clear"))
        self.clearButton.setAutoDefault(False)
        self.clearButton.clicked.connect(self.__clearResults)

        self.openButton.setEnabled(False)
        self.openButton.setIcon(EricPixmapCache.getIcon("open"))
        self.openButton.setAutoDefault(False)
        self.openButton.clicked.connect(self.__openFile)

        self.__project = project
        self.__project.projectOpened.connect(self.__projectOpened)
        self.__project.projectClosed.connect(self.__projectClosed)

        self.extsepLabel.setText(os.extsep)

        self.__shouldStop = False

        self.fileNameEdit.returnPressed.connect(self.__searchFile)
        self.fileExtEdit.returnPressed.connect(self.__searchFile)

        self.__projectClosed()

    @pyqtSlot()
    def __stopSearch(self):
        """
        Private slot to handle the stop button being pressed.
        """
        self.__shouldStop = True

    @pyqtSlot()
    def __openFile(self, itm=None):
        """
        Private slot to open a file.

        It emits a signal depending on the file extension.

        @param itm item to be opened
        @type QTreeWidgetItem
        """
        if itm is None:
            itm = self.fileList.currentItem()
        if itm is not None:
            fileName = itm.text(0)
            filePath = itm.text(1)
            fileExt = os.path.splitext(fileName)[1]
            fullName = os.path.join(filePath, fileName)

            if fileExt == ".ui":
                self.designerFile.emit(fullName)
            elif fileExt == ".ts":
                self.linguistFile.emit(fullName)
            elif fileExt == ".qm":
                self.trpreview.emit([fullName])
            elif fileExt in (".egj",):
                self.umlFile.emit(fullName)
            elif fileExt == ".svg":
                self.svgFile.emit(fullName)
            elif fileExt[1:] in QImageReader.supportedImageFormats():
                self.pixmapFile.emit(fullName)
            else:
                if Utilities.MimeTypes.isTextFile(fullName):
                    self.sourceFile.emit(fullName)
                else:
                    QDesktopServices.openUrl(QUrl(fullName))

    @pyqtSlot()
    def __searchFile(self):
        """
        Private slot to handle the search.
        """
        fileName = self.fileNameEdit.text()
        fileExt = self.fileExtEdit.text()

        self.findStatusLabel.clear()

        patternFormat = (
            "{0}{1}{2}" if "*" in fileName or "?" in fileName else "{0}*{1}{2}"
        )

        fileNamePatterns = [
            patternFormat.format(fileName or "*", os.extsep, fileExt or "*")
        ]

        if not fileExt:
            # search for files without extension as well
            if "*" in fileName or "?" in fileName:
                patternFormat = "{0}"
            else:
                patternFormat = "{0}*"

            fileNamePatterns.append(patternFormat.format(fileName or "*"))

        searchPaths = []
        ignorePaths = []
        if self.searchDirCheckBox.isChecked() and self.searchDirPicker.text() != "":
            searchPaths.append(self.searchDirPicker.text())
        if self.projectCheckBox.isChecked():
            searchPaths.append(self.__project.getProjectPath())
            ignorePaths.append(self.__project.getProjectVenvPath())
        if self.syspathCheckBox.isChecked():
            searchPaths.extend(sys.path)

        self.fileList.clear()
        locations = {}
        self.__shouldStop = False
        self.stopButton.setEnabled(True)
        self.clearButton.setEnabled(False)
        QApplication.processEvents()

        for path in searchPaths:
            if os.path.isdir(path):
                files = FileSystemUtilities.direntries(
                    path,
                    filesonly=True,
                    pattern=fileNamePatterns,
                    followsymlinks=False,
                    checkStop=self.checkStop,
                    ignore=ignorePaths,
                )
                if files:
                    for file in files:
                        fp, fn = os.path.split(file)
                        if fn in locations:
                            if fp in locations[fn]:
                                continue
                            else:
                                locations[fn].append(fp)
                        else:
                            locations[fn] = [fp]
                        QTreeWidgetItem(self.fileList, [fn, fp])
                    QApplication.processEvents()

        del locations
        self.stopButton.setEnabled(False)
        self.fileList.sortItems(self.fileList.sortColumn(), Qt.SortOrder.AscendingOrder)
        self.fileList.header().resizeSections(QHeaderView.ResizeMode.ResizeToContents)
        self.fileList.header().resizeSection(0, self.width() // 2)
        self.fileList.header().setStretchLastSection(True)

        self.findStatusLabel.setText(
            self.tr("%n file(s) found", "", self.fileList.topLevelItemCount())
        )

        self.clearButton.setEnabled(self.fileList.topLevelItemCount() != 0)

    @pyqtSlot()
    def __clearResults(self):
        """
        Private slot to clear the current search results.
        """
        self.fileList.clear()
        self.clearButton.setEnabled(False)
        self.openButton.setEnabled(False)

    def checkStop(self):
        """
        Public method to check, if the search should be stopped.

        @return flag indicating the search should be stopped
        @rtype bool
        """
        QApplication.processEvents()
        return self.__shouldStop

    @pyqtSlot(str)
    def on_searchDirPicker_textChanged(self, text):
        """
        Private slot to handle the textChanged signal of the search directory
        edit.

        @param text text of the search dir edit
        @type str
        """
        self.searchDirCheckBox.setEnabled(text != "")

    @pyqtSlot(QTreeWidgetItem, int)
    def on_fileList_itemActivated(self, itm, column):
        """
        Private slot to handle the double click on a file item.

        It emits the signal sourceFile or designerFile depending on the
        file extension.

        @param itm the double clicked listview item
        @type QTreeWidgetItem
        @param column column that was double clicked (ignored)
        @type int
        """
        self.__openFile(itm)

    @pyqtSlot(QTreeWidgetItem, QTreeWidgetItem)
    def on_fileList_currentItemChanged(self, current, previous):
        """
        Private slot handling a change of the current item.

        @param current current item
        @type QTreeWidgetItem
        @param previous prevoius current item
        @type QTreeWidgetItem
        """
        self.openButton.setEnabled(current is not None)

    @pyqtSlot()
    def __projectOpened(self):
        """
        Private slot to handle a project being opened.
        """
        self.projectCheckBox.setEnabled(True)
        self.projectCheckBox.setChecked(True)

    @pyqtSlot()
    def __projectClosed(self):
        """
        Private slot to handle a project being closed.
        """
        self.projectCheckBox.setEnabled(False)
        self.projectCheckBox.setChecked(False)

    @pyqtSlot()
    def activate(self):
        """
        Public slot to activate this widget.
        """
        self.fileNameEdit.selectAll()
        self.fileNameEdit.setFocus()


class FindLocationDialog(QDialog):
    """
    Class implementing a dialog to search for files.

    The occurrences found are displayed in a QTreeWidget showing the
    filename and the pathname. The file will be opened upon a double click
    onto the respective entry of the list or by pressing the open button.

    @signal sourceFile(str) emitted to open a file in the editor
    @signal designerFile(str) emitted to open a Qt-Designer file
    @signal linguistFile(str) emitted to open a Qt-Linguist (*.ts) file
    @signal trpreview([str]) emitted to preview Qt-Linguist (*.qm) files
    @signal pixmapFile(str) emitted to open a pixmap file
    @signal svgFile(str) emitted to open a SVG file
    @signal umlFile(str) emitted to open an eric UML file
    """

    sourceFile = pyqtSignal(str)
    designerFile = pyqtSignal(str)
    linguistFile = pyqtSignal(str)
    trpreview = pyqtSignal(list)
    pixmapFile = pyqtSignal(str)
    svgFile = pyqtSignal(str)
    umlFile = pyqtSignal(str)

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

        @param project reference to the project object
        @type Project
        @param parent parent widget of this dialog (defaults to None)
        @type QWidget (optional)
        """
        super().__init__(parent)
        self.setWindowFlags(Qt.WindowType.Window)

        self.__layout = QVBoxLayout()

        self.__findWidget = FindLocationWidget(project, self)
        self.__layout.addWidget(self.__findWidget)

        self.__buttonBox = QDialogButtonBox(
            QDialogButtonBox.StandardButton.Close, Qt.Orientation.Horizontal, self
        )
        self.__buttonBox.button(QDialogButtonBox.StandardButton.Close).setAutoDefault(
            False
        )
        self.__layout.addWidget(self.__buttonBox)

        self.setLayout(self.__layout)
        self.resize(600, 800)

        # connect the widgets
        self.__findWidget.sourceFile.connect(self.sourceFile)
        self.__findWidget.designerFile.connect(self.designerFile)
        self.__findWidget.linguistFile.connect(self.linguistFile)
        self.__findWidget.trpreview.connect(self.trpreview)
        self.__findWidget.pixmapFile.connect(self.pixmapFile)
        self.__findWidget.svgFile.connect(self.svgFile)
        self.__findWidget.umlFile.connect(self.umlFile)

        self.__buttonBox.accepted.connect(self.accept)
        self.__buttonBox.rejected.connect(self.reject)

    def activate(self):
        """
        Public method to activate the dialog.
        """
        self.__findWidget.activate()

        self.raise_()
        self.activateWindow()
        self.show()
