#############################################################################
##
## Copyright (C) 2021 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
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## This file is part of the examples of PyQt.
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## $QT_END_LICENSE$
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#############################################################################


from PyQt6.QtCore import (QDir, QIODevice, QFile, QFileInfo, Qt, QTextStream,
        QUrl)
from PyQt6.QtGui import QDesktopServices
from PyQt6.QtWidgets import (QAbstractItemView, QApplication, QComboBox,
        QDialog, QFileDialog, QGridLayout, QHBoxLayout, QHeaderView, QLabel,
        QProgressDialog, QPushButton, QSizePolicy, QTableWidget,
        QTableWidgetItem)


class Window(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)

        browseButton = self.createButton("&Browse...", self.browse)
        findButton = self.createButton("&Find", self.find)

        self.fileComboBox = self.createComboBox("*")
        self.textComboBox = self.createComboBox()
        self.directoryComboBox = self.createComboBox(QDir.currentPath())

        fileLabel = QLabel("Named:")
        textLabel = QLabel("Containing text:")
        directoryLabel = QLabel("In directory:")
        self.filesFoundLabel = QLabel()

        self.createFilesTable()

        buttonsLayout = QHBoxLayout()
        buttonsLayout.addStretch()
        buttonsLayout.addWidget(findButton)

        mainLayout = QGridLayout()
        mainLayout.addWidget(fileLabel, 0, 0)
        mainLayout.addWidget(self.fileComboBox, 0, 1, 1, 2)
        mainLayout.addWidget(textLabel, 1, 0)
        mainLayout.addWidget(self.textComboBox, 1, 1, 1, 2)
        mainLayout.addWidget(directoryLabel, 2, 0)
        mainLayout.addWidget(self.directoryComboBox, 2, 1)
        mainLayout.addWidget(browseButton, 2, 2)
        mainLayout.addWidget(self.filesTable, 3, 0, 1, 3)
        mainLayout.addWidget(self.filesFoundLabel, 4, 0)
        mainLayout.addLayout(buttonsLayout, 5, 0, 1, 3)
        self.setLayout(mainLayout)

        self.setWindowTitle("Find Files")
        self.resize(700, 300)

    def browse(self):
        directory = QFileDialog.getExistingDirectory(self, "Find Files",
                QDir.currentPath())

        if directory:
            if self.directoryComboBox.findText(directory) == -1:
                self.directoryComboBox.addItem(directory)

            self.directoryComboBox.setCurrentIndex(self.directoryComboBox.findText(directory))

    @staticmethod
    def updateComboBox(comboBox):
        if comboBox.findText(comboBox.currentText()) == -1:
            comboBox.addItem(comboBox.currentText())

    def find(self):
        self.filesTable.setRowCount(0)

        fileName = self.fileComboBox.currentText()
        text = self.textComboBox.currentText()
        path = self.directoryComboBox.currentText()

        self.updateComboBox(self.fileComboBox)
        self.updateComboBox(self.textComboBox)
        self.updateComboBox(self.directoryComboBox)

        self.currentDir = QDir(path)
        if not fileName:
            fileName = "*"
        files = self.currentDir.entryList([fileName],
                QDir.Filter.Files | QDir.Filter.NoSymLinks)

        if text:
            files = self.findFiles(files, text)
        self.showFiles(files)

    def findFiles(self, files, text):
        progressDialog = QProgressDialog(self)

        progressDialog.setCancelButtonText("&Cancel")
        progressDialog.setRange(0, files.count())
        progressDialog.setWindowTitle("Find Files")

        foundFiles = []

        for i in range(files.count()):
            progressDialog.setValue(i)
            progressDialog.setLabelText("Searching file number %d of %d..." % (i, files.count()))
            QApplication.processEvents()

            if progressDialog.wasCanceled():
                break

            inFile = QFile(self.currentDir.absoluteFilePath(files[i]))

            if inFile.open(QIODevice.OpenModeFlag.ReadOnly):
                stream = QTextStream(inFile)
                while not stream.atEnd():
                    if progressDialog.wasCanceled():
                        break
                    line = stream.readLine()
                    if text in line:
                        foundFiles.append(files[i])
                        break

        progressDialog.close()

        return foundFiles

    def showFiles(self, files):
        for fn in files:
            file = QFile(self.currentDir.absoluteFilePath(fn))
            size = QFileInfo(file).size()

            fileNameItem = QTableWidgetItem(fn)
            fileNameItem.setFlags(
                    fileNameItem.flags() ^ Qt.ItemFlag.ItemIsEditable)
            sizeItem = QTableWidgetItem("%d KB" % (int((size + 1023) / 1024)))
            sizeItem.setTextAlignment(
                    Qt.AlignmentFlags.AlignVCenter | Qt.AlignmentFlags.AlignRight)
            sizeItem.setFlags(sizeItem.flags() ^ Qt.ItemFlag.ItemIsEditable)

            row = self.filesTable.rowCount()
            self.filesTable.insertRow(row)
            self.filesTable.setItem(row, 0, fileNameItem)
            self.filesTable.setItem(row, 1, sizeItem)

        self.filesFoundLabel.setText("%d file(s) found (Double click on a file to open it)" % len(files))

    def createButton(self, text, member):
        button = QPushButton(text)
        button.clicked.connect(member)
        return button

    def createComboBox(self, text=""):
        comboBox = QComboBox()
        comboBox.setEditable(True)
        comboBox.addItem(text)
        comboBox.setSizePolicy(QSizePolicy.Policy.Expanding,
                QSizePolicy.Policy.Preferred)
        return comboBox

    def createFilesTable(self):
        self.filesTable = QTableWidget(0, 2)
        self.filesTable.setSelectionBehavior(
                QAbstractItemView.SelectionBehavior.SelectRows)

        self.filesTable.setHorizontalHeaderLabels(("File Name", "Size"))
        self.filesTable.horizontalHeader().setSectionResizeMode(0,
                QHeaderView.ResizeMode.Stretch)
        self.filesTable.verticalHeader().hide()
        self.filesTable.setShowGrid(False)

        self.filesTable.cellActivated.connect(self.openFileOfItem)

    def openFileOfItem(self, row, column):
        item = self.filesTable.item(row, 0)

        QDesktopServices.openUrl(QUrl(self.currentDir.absoluteFilePath(item.text())))


if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec())
