from uuid import uuid1

from aliyun_video.models import AliyunVideo, AliyunVideoHistory
from aliyun_video.core.utils import get_valid_cdn_url


def generate_video_trace_id():
    return str(uuid1())


class LectureAdapter:

    def get_progress(self, lesson_id, user_id):
        history = AliyunVideoHistory.objects.filter(
            video__lesson_id=lesson_id,
            user_id=user_id)
        if not history:
            return 0
        else:
            history = history.first()
            return history.played_at / history.video.duration

    def description(self, lesson, user):
        trace_id = generate_video_trace_id()

        video = AliyunVideo.objects.get(lesson_id=lesson.id)
        datas = {
            'trace_id': trace_id,
            'video_id': video.video_id,
            'duration': video.duration,
            'cover_image_url': get_valid_cdn_url(video.cover_image_url),
            'log_url': video.log_url,
            'played_at': None,
            'last_definition': None,
            'play_details': []
        }

        if user.is_authenticated:
            try:
                history = AliyunVideoHistory.objects.get(
                    video=video,
                    user=user)
                datas.update({
                    'played_at': history.played_at,
                    'last_definition': history.last_definition
                })
            except AliyunVideoHistory.DoesNotExist:
                pass

        for play_detail in video.video_play_details.all():
            datas['play_details'].append({
                'play_url': '{}?trace_id={}'.format(play_detail.play_url, trace_id),
                'play_id': play_detail.play_id,
                'bit_rate': play_detail.bit_rate,
                'definition': play_detail.definition,
                'width': play_detail.width,
                'height': play_detail.height
            })
        return datas


lecture_adapter = LectureAdapter()