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from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from app.database import get_db
from app.models.user import User
from app.models.project import Project
from app.models.episode import Episode
from app.schemas.episode import EpisodeCreate, EpisodeResponse
from app.services.auth import get_current_user

router = APIRouter(prefix="/api/projects/{project_id}/episodes", tags=["episodes"])


async def _get_user_project(project_id: int, user: User, db: AsyncSession) -> Project:
    result = await db.execute(
        select(Project).where(Project.id == project_id, Project.user_id == user.id)
    )
    project = result.scalar_one_or_none()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")
    return project


@router.get("", response_model=list[EpisodeResponse])
async def list_episodes(
    project_id: int,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    await _get_user_project(project_id, user, db)
    result = await db.execute(
        select(Episode)
        .where(Episode.project_id == project_id)
        .order_by(Episode.episode_number)
    )
    return list(result.scalars().all())


@router.post("", response_model=EpisodeResponse, status_code=201)
async def create_episode(
    project_id: int,
    data: EpisodeCreate,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    await _get_user_project(project_id, user, db)
    episode = Episode(project_id=project_id, **data.model_dump(exclude_none=True))
    db.add(episode)
    await db.commit()
    await db.refresh(episode)
    return episode


@router.get("/{episode_id}", response_model=EpisodeResponse)
async def get_episode(
    project_id: int,
    episode_id: int,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    await _get_user_project(project_id, user, db)
    result = await db.execute(
        select(Episode).where(Episode.id == episode_id, Episode.project_id == project_id)
    )
    episode = result.scalar_one_or_none()
    if not episode:
        raise HTTPException(status_code=404, detail="Episode not found")
    return episode