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

from app.core.database import get_db
from app.crud import attachment_point_name as apn_crud
from app.crud import audit as audit_crud
from app.deps import require_permission
from app.models.user import User
from app.schemas.attachment_point_name import (
    AttachmentPointNameCreate,
    AttachmentPointNameRead,
    AttachmentPointNameUpdate,
)

router = APIRouter()


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


@router.post(
    "", response_model=AttachmentPointNameRead, status_code=status.HTTP_201_CREATED
)
async def create_attachment_point_name(
    payload: AttachmentPointNameCreate,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("attachment_point_names:write")),
):
    if await apn_crud.get_by_name(db, payload.name):
        raise HTTPException(
            status_code=409, detail="Attachment point name already exists"
        )
    apn = await apn_crud.create(db, name=payload.name)
    await audit_crud.log(
        db,
        actor=actor,
        action="create",
        resource_type="AttachmentPointName",
        resource_id=apn.id,
        description=audit_crud.describe_create("AttachmentPointName", apn.id, apn.name),
    )
    return apn


@router.get("/{apn_id}", response_model=AttachmentPointNameRead)
async def get_attachment_point_name(
    apn_id: int,
    db: AsyncSession = Depends(get_db),
    _: User = Depends(require_permission("attachment_point_names:read")),
):
    apn = await apn_crud.get(db, apn_id)
    if apn is None:
        raise HTTPException(status_code=404, detail="Attachment point name not found")
    return apn


@router.patch("/{apn_id}", response_model=AttachmentPointNameRead)
async def update_attachment_point_name(
    apn_id: int,
    payload: AttachmentPointNameUpdate,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("attachment_point_names:write")),
):
    apn = await apn_crud.get(db, apn_id)
    if apn is None:
        raise HTTPException(status_code=404, detail="Attachment point name not found")
    changes = payload.model_dump(exclude_unset=True)
    if "name" in changes:
        existing = await apn_crud.get_by_name(db, changes["name"])
        if existing is not None and existing.id != apn.id:
            raise HTTPException(
                status_code=409, detail="Attachment point name already exists"
            )
    apn = await apn_crud.update(db, apn, changes)
    await audit_crud.log(
        db,
        actor=actor,
        action="update",
        resource_type="AttachmentPointName",
        resource_id=apn.id,
        description=audit_crud.describe_update("AttachmentPointName", apn.id, changes),
    )
    return apn


@router.delete("/{apn_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_attachment_point_name(
    apn_id: int,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("attachment_point_names:delete")),
):
    apn = await apn_crud.get(db, apn_id)
    if apn is None:
        raise HTTPException(status_code=404, detail="Attachment point name not found")
    name = apn.name
    await apn_crud.delete(db, apn)
    await audit_crud.log(
        db,
        actor=actor,
        action="delete",
        resource_type="AttachmentPointName",
        resource_id=apn_id,
        description=audit_crud.describe_delete("AttachmentPointName", apn_id, name),
    )