"""Life-event CRUD nested under a scenario."""
from __future__ import annotations

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

from fire_planner.api.dependencies import get_session
from fire_planner.api.schemas import LifeEventCreate, LifeEventOut, LifeEventPatch
from fire_planner.db import LifeEvent, Scenario

router = APIRouter(tags=["life-events"])


@router.get(
    "/scenarios/{scenario_id}/life-events",
    response_model=list[LifeEventOut],
)
async def list_events(
    scenario_id: int,
    session: AsyncSession = Depends(get_session),
) -> list[LifeEvent]:
    scen = await session.get(Scenario, scenario_id)
    if scen is None:
        raise HTTPException(status_code=404, detail="Scenario not found")
    rows = (await session.execute(
        select(LifeEvent).where(LifeEvent.scenario_id == scenario_id).order_by(
            LifeEvent.year_start, LifeEvent.id))).scalars().all()
    return list(rows)


@router.post(
    "/scenarios/{scenario_id}/life-events",
    response_model=LifeEventOut,
    status_code=201,
)
async def create_event(
    scenario_id: int,
    payload: LifeEventCreate,
    session: AsyncSession = Depends(get_session),
) -> LifeEvent:
    scen = await session.get(Scenario, scenario_id)
    if scen is None:
        raise HTTPException(status_code=404, detail="Scenario not found")
    if payload.year_end is not None and payload.year_end < payload.year_start:
        raise HTTPException(status_code=400, detail="year_end < year_start")
    ev = LifeEvent(scenario_id=scenario_id, **payload.model_dump())
    session.add(ev)
    await session.commit()
    await session.refresh(ev)
    return ev


@router.patch(
    "/life-events/{event_id}",
    response_model=LifeEventOut,
)
async def patch_event(
    event_id: int,
    payload: LifeEventPatch,
    session: AsyncSession = Depends(get_session),
) -> LifeEvent:
    ev = await session.get(LifeEvent, event_id)
    if ev is None:
        raise HTTPException(status_code=404, detail="Event not found")
    updates = payload.model_dump(exclude_unset=True)
    for k, v in updates.items():
        setattr(ev, k, v)
    if ev.year_end is not None and ev.year_end < ev.year_start:
        raise HTTPException(status_code=400, detail="year_end < year_start")
    await session.commit()
    await session.refresh(ev)
    return ev


@router.delete(
    "/life-events/{event_id}",
    status_code=204,
    response_model=None,
)
async def delete_event(
    event_id: int,
    session: AsyncSession = Depends(get_session),
) -> None:
    ev = await session.get(LifeEvent, event_id)
    if ev is None:
        raise HTTPException(status_code=404, detail="Event not found")
    await session.execute(delete(LifeEvent).where(LifeEvent.id == event_id))
    await session.commit()