import sys
import os

from PySide6.QtMultimediaWidgets import QVideoWidget
from PySide6.QtCore import Slot, Qt
from PySide6.QtGui import QImage, QPixmap
from PySide6.QtWidgets import QLabel
from PySide6.QtMultimedia import (
    QMediaDevices, QCamera, QImageCapture, QMediaCaptureSession)
from appdirs import user_data_dir
from datetime import datetime
from itertools import groupby

if os.environ.get("PHOTO_DIR"):
    IMAGES_PATH = os.environ.get("PHOTO_DIR")
else:
    raise ValueError(
        "не задана локальная переменная PHOTO_DIR"
    )


class WorkWithCam:
    def __init__(self, q_Video_Widget: QVideoWidget, name_cam: str) -> None:
        self._create_dirs()

        self._capture_session = None
        self._camera = None
        self._camera_info = None
        self._image_capture = None
        self._video_widget = q_Video_Widget

        self._camera_info = get_object_cam_by_name(name_cam)
        if not self._camera_info:
            raise IndexError(
                f"Не нашли камеру QMediaDevices.videoInputs(). убидитесь, что у вас есть камера")

        self._file_name = self.get_filename()

    def start_cam(self):
        self._camera = QCamera(self._camera_info)
        self._camera.errorOccurred.connect(self._camera_error)
        self._image_capture = QImageCapture(self._camera)
        self._image_capture.imageCaptured.connect(self.image_captured)
        self._image_capture.imageSaved.connect(self.image_saved)
        self._image_capture.errorOccurred.connect(self._capture_error)
        self._capture_session = QMediaCaptureSession()
        self._capture_session.setCamera(self._camera)
        self._capture_session.setImageCapture(self._image_capture)

        if self._camera and self._camera.error() == QCamera.NoError:
            # print()
            name = self._camera_info.description()
            self._capture_session.setVideoOutput(self._video_widget)
            self._camera.start()
        else:
            print("Camera unavailable")

    def stop_cam(self) -> None:
        if self._camera and self._camera.isActive():
            self._camera.stop()

    def __del__(self) -> None:
        self.stop_cam()

    def cupture_image(self) -> str:
        self._current_preview = QImage()
        self._image_capture.captureToFile(self._file_name)
        return self._file_name

    @Slot(int, QImageCapture.Error, str)
    def _capture_error(self, id, error, error_string):
        print(error_string, file=sys.stderr)
        self.show_status_message(error_string)

    @Slot(QCamera.Error, str)
    def _camera_error(self, error, error_string):
        print(error_string, file=sys.stderr)
        self.show_status_message(error_string)

    @staticmethod
    def get_filename() -> str:
        return F"{IMAGES_PATH}/propusk_{datetime.now().timestamp()}.jpg"

    def _create_dirs(self):
        if not os.path.exists(IMAGES_PATH):
            os.mkdir(IMAGES_PATH)

    @Slot(int, QImage)
    def image_captured(self, id, previewImage):
        self._current_preview = previewImage

    @Slot(int, str)
    def image_saved(self, id, fileName):
        ...

    def show_status_message(self, message):
        print(message, 5000)


def load_image(qlabel: QLabel, path_file: str) -> None:
    qlabel.setPixmap(QPixmap(QImage(path_file)).scaled(
        qlabel.width()-4,
        qlabel.height(),
        Qt.AspectRatioMode.KeepAspectRatio,
        Qt.TransformationMode.FastTransformation
    ))


def get_list_name_cam() -> list:
    return [x for x, _ in groupby(
        [x.description() for x in QMediaDevices.videoInputs()]
    )]

def get_object_cam_by_name(name_cam: str) -> QMediaDevices:
    return [x for x in QMediaDevices.videoInputs() if x.description() == name_cam][0]