from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from app.dependencies import get_db, get_current_user
from app.models.child import Child
from app.models.user import User
from app.schemas.child import ChildCreate, ChildOut, ChildUpdate

router = APIRouter(prefix="/api/children", tags=["children"])


@router.get("", response_model=list[ChildOut])
async def list_children(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Child).where(Child.user_id == current_user.id).order_by(Child.name)
    )
    return result.scalars().all()


@router.post("", response_model=ChildOut, status_code=status.HTTP_201_CREATED)
async def create_child(
    body: ChildCreate,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    child = Child(**body.model_dump(), user_id=current_user.id)
    db.add(child)
    await db.commit()
    await db.refresh(child)
    return child


@router.get("/{child_id}", response_model=ChildOut)
async def get_child(
    child_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Child).where(Child.id == child_id, Child.user_id == current_user.id)
    )
    child = result.scalar_one_or_none()
    if not child:
        raise HTTPException(status_code=404, detail="Child not found")
    return child


@router.patch("/{child_id}", response_model=ChildOut)
async def update_child(
    child_id: int,
    body: ChildUpdate,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Child).where(Child.id == child_id, Child.user_id == current_user.id)
    )
    child = result.scalar_one_or_none()
    if not child:
        raise HTTPException(status_code=404, detail="Child not found")

    for field, value in body.model_dump(exclude_none=True).items():
        setattr(child, field, value)
    await db.commit()
    await db.refresh(child)
    return child


@router.delete("/{child_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_child(
    child_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Child).where(Child.id == child_id, Child.user_id == current_user.id)
    )
    child = result.scalar_one_or_none()
    if not child:
        raise HTTPException(status_code=404, detail="Child not found")
    await db.delete(child)
    await db.commit()