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

from app.core.database import get_db
from app.crud import audit as audit_crud
from app.crud import iso_thread as iso_thread_crud
from app.deps import require_permission
from app.models.user import User
from app.schemas.iso_thread import IsoThreadCreate, IsoThreadRead, IsoThreadUpdate

router = APIRouter()


@router.get("", response_model=list[IsoThreadRead])
async def list_iso_threads(
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db),
    _: User = Depends(require_permission("iso_threads:read")),
):
    return await iso_thread_crud.list_all(db, skip=skip, limit=limit)


@router.post("", response_model=IsoThreadRead, status_code=status.HTTP_201_CREATED)
async def create_iso_thread(
    payload: IsoThreadCreate,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("iso_threads:write")),
):
    thread = await iso_thread_crud.create(
        db,
        diameter_mm=payload.diameter_mm,
        pitch_mm=payload.pitch_mm,
        depth_mm=payload.depth_mm,
    )
    await audit_crud.log(
        db, actor=actor, action="create", resource_type="IsoThread",
        resource_id=thread.id,
        description=audit_crud.describe_create("IsoThread", thread.id, f"M{thread.diameter_mm}×{thread.pitch_mm}"),
    )
    return thread


@router.get("/{iso_thread_id}", response_model=IsoThreadRead)
async def get_iso_thread(
    iso_thread_id: int,
    db: AsyncSession = Depends(get_db),
    _: User = Depends(require_permission("iso_threads:read")),
):
    thread = await iso_thread_crud.get(db, iso_thread_id)
    if thread is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="ISO thread not found")
    return thread


@router.patch("/{iso_thread_id}", response_model=IsoThreadRead)
async def update_iso_thread(
    iso_thread_id: int,
    payload: IsoThreadUpdate,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("iso_threads:write")),
):
    thread = await iso_thread_crud.get(db, iso_thread_id)
    if thread is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="ISO thread not found")
    changes = payload.model_dump(exclude_unset=True)
    thread = await iso_thread_crud.update(db, thread, changes)
    await audit_crud.log(
        db, actor=actor, action="update", resource_type="IsoThread",
        resource_id=thread.id,
        description=audit_crud.describe_update("IsoThread", thread.id, changes),
    )
    return thread


@router.delete("/{iso_thread_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_iso_thread(
    iso_thread_id: int,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("iso_threads:delete")),
):
    thread = await iso_thread_crud.get(db, iso_thread_id)
    if thread is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="ISO thread not found")
    name = f"M{thread.diameter_mm}×{thread.pitch_mm}"
    await iso_thread_crud.delete(db, thread)
    await audit_crud.log(
        db, actor=actor, action="delete", resource_type="IsoThread",
        resource_id=iso_thread_id,
        description=audit_crud.describe_delete("IsoThread", iso_thread_id, name),
    )