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"""PySide6 Multimedia Camera Example"""

import os, sys
from PySide6.QtCore import QDate, QDir, QStandardPaths, Qt, QUrl
from PySide6.QtGui import QAction, QGuiApplication, QDesktopServices, QIcon
from PySide6.QtGui import QImage, QPixmap
from PySide6.QtWidgets import (QApplication, QHBoxLayout, QLabel,
    QMainWindow, QPushButton, QTabWidget, QToolBar, QVBoxLayout, QWidget)
from PySide6.QtMultimedia import QCamera, QCameraImageCapture, QCameraInfo
from PySide6.QtMultimediaWidgets import QCameraViewfinder


class ImageView(QWidget):
    def __init__(self, previewImage, fileName):
        super().__init__()

        self.fileName = fileName

        mainLayout = QVBoxLayout(self)
        self.imageLabel = QLabel()
        self.imageLabel.setPixmap(QPixmap.fromImage(previewImage))
        mainLayout.addWidget(self.imageLabel)

        topLayout = QHBoxLayout()
        self.fileNameLabel = QLabel(QDir.toNativeSeparators(fileName))
        self.fileNameLabel.setTextInteractionFlags(Qt.TextBrowserInteraction)

        topLayout.addWidget(self.fileNameLabel)
        topLayout.addStretch()
        copyButton = QPushButton("Copy")
        copyButton.setToolTip("Copy file name to clipboard")
        topLayout.addWidget(copyButton)
        copyButton.clicked.connect(self.copy)
        launchButton = QPushButton("Launch")
        launchButton.setToolTip("Launch image viewer")
        topLayout.addWidget(launchButton)
        launchButton.clicked.connect(self.launch)
        mainLayout.addLayout(topLayout)

    def copy(self):
        QGuiApplication.clipboard().setText(self.fileNameLabel.text())

    def launch(self):
        QDesktopServices.openUrl(QUrl.fromLocalFile(self.fileName))


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.cameraInfo = QCameraInfo.defaultCamera()
        self.camera = QCamera(self.cameraInfo)
        self.camera.setCaptureMode(QCamera.CaptureStillImage)
        self.imageCapture = QCameraImageCapture(self.camera)
        self.imageCapture.imageCaptured.connect(self.imageCaptured)
        self.imageCapture.imageSaved.connect(self.imageSaved)
        self.currentPreview = QImage()

        toolBar = QToolBar()
        self.addToolBar(toolBar)

        fileMenu = self.menuBar().addMenu("&File")
        shutterIcon = QIcon(os.path.join(os.path.dirname(__file__),
                            "shutter.svg"))
        self.takePictureAction = QAction(shutterIcon, "&Take Picture", self,
                                         shortcut="Ctrl+T",
                                         triggered=self.takePicture)
        self.takePictureAction.setToolTip("Take Picture")
        fileMenu.addAction(self.takePictureAction)
        toolBar.addAction(self.takePictureAction)

        exitAction = QAction(QIcon.fromTheme("application-exit"), "E&xit",
                             self, shortcut="Ctrl+Q", triggered=self.close)
        fileMenu.addAction(exitAction)

        aboutMenu = self.menuBar().addMenu("&About")
        aboutQtAction = QAction("About &Qt", self, triggered=qApp.aboutQt)
        aboutMenu.addAction(aboutQtAction)

        self.tabWidget = QTabWidget()
        self.setCentralWidget(self.tabWidget)

        self.cameraViewfinder = QCameraViewfinder()
        self.camera.setViewfinder(self.cameraViewfinder)
        self.tabWidget.addTab(self.cameraViewfinder, "Viewfinder")

        if self.camera.status() != QCamera.UnavailableStatus:
            name = self.cameraInfo.description()
            self.setWindowTitle("PySide6 Camera Example (" + name + ")")
            self.statusBar().showMessage("Starting: '" + name + "'", 5000)
            self.camera.start()
        else:
            self.setWindowTitle("PySide6 Camera Example")
            self.takePictureAction.setEnabled(False)
            self.statusBar().showMessage("Camera unavailable", 5000)

    def nextImageFileName(self):
        picturesLocation = QStandardPaths.writableLocation(QStandardPaths.PicturesLocation)
        dateString = QDate.currentDate().toString("yyyyMMdd")
        pattern = picturesLocation + "/pyside6_camera_" + dateString + "_{:03d}.jpg"
        n = 1
        while True:
            result = pattern.format(n)
            if not os.path.exists(result):
                return result
            n = n + 1
        return None

    def takePicture(self):
        self.currentPreview = QImage()
        self.camera.searchAndLock()
        self.imageCapture.capture(self.nextImageFileName())
        self.camera.unlock()

    def imageCaptured(self, id, previewImage):
        self.currentPreview = previewImage

    def imageSaved(self, id, fileName):
        index = self.tabWidget.count()
        imageView = ImageView(self.currentPreview, fileName)
        self.tabWidget.addTab(imageView, "Capture #{}".format(index))
        self.tabWidget.setCurrentIndex(index)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWin = MainWindow()
    availableGeometry = app.desktop().availableGeometry(mainWin)
    mainWin.resize(availableGeometry.width() / 3, availableGeometry.height() / 2)
    mainWin.show()
    sys.exit(app.exec())
