#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
##     permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################


from PyQt5.QtCore import (QDir, QIODevice, QFile, QFileInfo, Qt, QTextStream,
        QUrl)
from PyQt5.QtGui import QDesktopServices
from PyQt5.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(Window, self).__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.Files | QDir.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.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.ItemIsEditable)
            sizeItem = QTableWidgetItem("%d KB" % (int((size + 1023) / 1024)))
            sizeItem.setTextAlignment(Qt.AlignVCenter | Qt.AlignRight)
            sizeItem.setFlags(sizeItem.flags() ^ Qt.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.Expanding, QSizePolicy.Preferred)
        return comboBox

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

        self.filesTable.setHorizontalHeaderLabels(("File Name", "Size"))
        self.filesTable.horizontalHeader().setSectionResizeMode(0, QHeaderView.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_())
