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"""PySide2 Multimedia Camera Example"""

import os, sys
from PySide2.QtCore import QDate, QDir, QStandardPaths, Qt, QUrl
from PySide2.QtGui import QClipboard, QGuiApplication, QDesktopServices, QIcon
from PySide2.QtGui import QImage, QPixmap
from PySide2.QtWidgets import (QAction, qApp, QApplication, QHBoxLayout, QLabel,
    QMainWindow, QPushButton, QTabWidget, QToolBar, QVBoxLayout, QWidget)
from PySide2.QtMultimedia import QCamera, QCameraImageCapture, QCameraInfo
from PySide2.QtMultimediaWidgets import QCameraViewfinder

class ImageView(QWidget):
    def __init__(self, previewImage, fileName):
        super(ImageView, self).__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(MainWindow, self).__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("PySide2 Camera Example (" + name + ")")
            self.statusBar().showMessage("Starting: '" + name + "'", 5000)
            self.camera.start()
        else:
            self.setWindowTitle("PySide2 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 + "/pyside2_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_())