from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from app.core.auth_dependency import require_session
from app.db import get_db
from app.models.channel import Channel
from app.models.video import Video
from app.services.video_presentation import channel_categories_map, serialize_video

router = APIRouter(dependencies=[Depends(require_session)])


@router.get("/videos/{youtube_video_id}")
def get_video(youtube_video_id: str, db: Session = Depends(get_db)) -> dict:
    video = db.query(Video).filter(Video.youtube_video_id == youtube_video_id).one_or_none()
    if video is None:
        raise HTTPException(status_code=404, detail="Video not found")

    channel = db.get(Channel, video.channel_id)
    if channel is None:
        raise HTTPException(status_code=404, detail="Channel not found")

    categories = channel_categories_map(db, [channel.id]).get(channel.id, [])
    return serialize_video(video, channel, categories)