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.character import Character
from app.schemas.character import CharacterCreate, CharacterUpdate, CharacterResponse
from app.services.auth import get_current_user

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


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[CharacterResponse])
async def list_characters(
    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(Character)
        .where(Character.project_id == project_id)
        .order_by(Character.name)
    )
    return list(result.scalars().all())


@router.post("", response_model=CharacterResponse, status_code=201)
async def create_character(
    project_id: int,
    data: CharacterCreate,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    await _get_user_project(project_id, user, db)
    character = Character(project_id=project_id, **data.model_dump(exclude_none=True))
    db.add(character)
    await db.commit()
    await db.refresh(character)
    return character


@router.patch("/{character_id}", response_model=CharacterResponse)
async def update_character(
    project_id: int,
    character_id: int,
    data: CharacterUpdate,
    user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    await _get_user_project(project_id, user, db)
    result = await db.execute(
        select(Character).where(Character.id == character_id, Character.project_id == project_id)
    )
    character = result.scalar_one_or_none()
    if not character:
        raise HTTPException(status_code=404, detail="Character not found")

    for key, value in data.model_dump(exclude_none=True).items():
        setattr(character, key, value)
    await db.commit()
    await db.refresh(character)
    return character