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

from app.api.deps import get_current_user, require_roles
from app.db.session import get_db
from app.models.auth import RolleTyp
from app.models.stammdaten import Bereich, Kategorie, Material, Objekttyp, Standort
from app.schemas.stammdaten import (
    BereichCreate,
    BereichRead,
    KategorieCreate,
    KategorieRead,
    MaterialCreate,
    MaterialRead,
    MaterialUpdate,
    ObjekttypCreate,
    ObjekttypRead,
    StandortCreate,
    StandortRead,
)

router = APIRouter()


# -- Bereich ------------------------------------------------------------------

@router.get("/bereiche", response_model=list[BereichRead])
async def liste_bereiche(
    db: AsyncSession = Depends(get_db), _=Depends(get_current_user)
) -> list[Bereich]:
    result = await db.execute(select(Bereich))
    return list(result.scalars().all())


@router.post("/bereiche", response_model=BereichRead, status_code=status.HTTP_201_CREATED)
async def erstelle_bereich(
    payload: BereichCreate,
    db: AsyncSession = Depends(get_db),
    _=Depends(require_roles(RolleTyp.administration)),
) -> Bereich:
    bereich = Bereich(**payload.model_dump())
    db.add(bereich)
    await db.flush()
    return bereich


# -- Kategorie ------------------------------------------------------------------

@router.get("/kategorien", response_model=list[KategorieRead])
async def liste_kategorien(
    db: AsyncSession = Depends(get_db), _=Depends(get_current_user)
) -> list[Kategorie]:
    result = await db.execute(select(Kategorie))
    return list(result.scalars().all())


@router.post("/kategorien", response_model=KategorieRead, status_code=status.HTTP_201_CREATED)
async def erstelle_kategorie(
    payload: KategorieCreate,
    db: AsyncSession = Depends(get_db),
    _=Depends(require_roles(RolleTyp.administration)),
) -> Kategorie:
    kategorie = Kategorie(**payload.model_dump())
    db.add(kategorie)
    await db.flush()
    return kategorie


# -- Standort ------------------------------------------------------------------

@router.get("/standorte", response_model=list[StandortRead])
async def liste_standorte(
    db: AsyncSession = Depends(get_db), _=Depends(get_current_user)
) -> list[Standort]:
    result = await db.execute(select(Standort))
    return list(result.scalars().all())


@router.post("/standorte", response_model=StandortRead, status_code=status.HTTP_201_CREATED)
async def erstelle_standort(
    payload: StandortCreate,
    db: AsyncSession = Depends(get_db),
    _=Depends(require_roles(RolleTyp.administration)),
) -> Standort:
    standort = Standort(**payload.model_dump())
    db.add(standort)
    await db.flush()
    return standort


# -- Objekttyp ------------------------------------------------------------------

@router.get("/objekttypen", response_model=list[ObjekttypRead])
async def liste_objekttypen(
    db: AsyncSession = Depends(get_db), _=Depends(get_current_user)
) -> list[Objekttyp]:
    result = await db.execute(select(Objekttyp))
    return list(result.scalars().all())


@router.post("/objekttypen", response_model=ObjekttypRead, status_code=status.HTTP_201_CREATED)
async def erstelle_objekttyp(
    payload: ObjekttypCreate,
    db: AsyncSession = Depends(get_db),
    _=Depends(require_roles(RolleTyp.administration)),
) -> Objekttyp:
    objekttyp = Objekttyp(**payload.model_dump())
    db.add(objekttyp)
    await db.flush()
    return objekttyp


# -- Material (Prompt 07) --------------------------------------------------

@router.get("/materialien", response_model=list[MaterialRead])
async def liste_materialien(
    db: AsyncSession = Depends(get_db), _=Depends(get_current_user)
) -> list[Material]:
    result = await db.execute(select(Material))
    return list(result.scalars().all())


@router.get("/materialien/{material_id}", response_model=MaterialRead)
async def hole_material(
    material_id: int,
    db: AsyncSession = Depends(get_db),
    _=Depends(get_current_user),
) -> Material:
    material = await db.get(Material, material_id)
    if material is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Material nicht gefunden")
    return material


@router.post("/materialien", response_model=MaterialRead, status_code=status.HTTP_201_CREATED)
async def erstelle_material(
    payload: MaterialCreate,
    db: AsyncSession = Depends(get_db),
    _=Depends(require_roles(RolleTyp.administration)),
) -> Material:
    material = Material(**payload.model_dump())
    db.add(material)
    await db.flush()
    return material


@router.patch("/materialien/{material_id}", response_model=MaterialRead)
async def aendere_material(
    material_id: int,
    payload: MaterialUpdate,
    db: AsyncSession = Depends(get_db),
    _=Depends(require_roles(RolleTyp.administration)),
) -> Material:
    material = await db.get(Material, material_id)
    if material is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Material nicht gefunden")
    for feld, wert in payload.model_dump(exclude_unset=True).items():
        setattr(material, feld, wert)
    await db.flush()
    return material