from os.path import splitext, join, exists

import cv2

from pycs.projects.ImageFile import ImageFile
from pycs.projects.MediaFile import MediaFile


class VideoFile(MediaFile):
    def __init__(self, obj, project_id):
        # add type to object
        obj['type'] = 'video'

        # call parent constructor
        super().__init__(obj, project_id)

        # generate thumbnail
        self.__thumbnail = self.__read_video()

    def __read_video(self):
        # determine some properties
        path, name = self.get_file()

        file_name, file_ext = splitext(name)
        video_path = join(path, name)
        image_path = join(path, f'{file_name}.jpg')

        # open video file
        video = cv2.VideoCapture(video_path)

        # read fps value
        self['fps'] = video.get(cv2.CAP_PROP_FPS)
        self['frameCount'] = int(video.get(cv2.CAP_PROP_FRAME_COUNT))

        # create thumbnail
        if not exists(image_path):
            _, image = video.read()
            cv2.imwrite(image_path, image)

        # close video file
        video.release()

        # return ImageFile from thumbnail
        copy = self.copy()
        copy['extension'] = '.jpg'

        return ImageFile(copy, self.project_id)

    def resize(self, maximum_width):
        return self.__thumbnail.resize(maximum_width)