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 clamp_connection as clamp_connection_crud
from app.deps import require_permission
from app.models.user import User
from app.schemas.clamp_connection import (
    ClampConnectionCreate,
    ClampConnectionRead,
    ClampConnectionUpdate,
)

router = APIRouter()


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


@router.post(
    "", response_model=ClampConnectionRead, status_code=status.HTTP_201_CREATED
)
async def create_clamp_connection(
    payload: ClampConnectionCreate,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("clamp_connections:write")),
):
    cc = await clamp_connection_crud.create(
        db,
        min_mm=payload.min_mm,
        max_mm=payload.max_mm,
        min_in=payload.min_in,
        max_in=payload.max_in,
    )
    await audit_crud.log(
        db,
        actor=actor,
        action="create",
        resource_type="ClampConnection",
        resource_id=cc.id,
        description=audit_crud.describe_create(
            "ClampConnection",
            cc.id,
            (
                f"{cc.min_mm}–{cc.max_mm} mm"
                if cc.min_mm is not None
                else f"{cc.min_in}–{cc.max_in} in"
            ),
        ),
    )
    return cc


@router.get("/{clamp_connection_id}", response_model=ClampConnectionRead)
async def get_clamp_connection(
    clamp_connection_id: int,
    db: AsyncSession = Depends(get_db),
    _: User = Depends(require_permission("clamp_connections:read")),
):
    cc = await clamp_connection_crud.get(db, clamp_connection_id)
    if cc is None:
        raise HTTPException(status_code=404, detail="Clamp connection not found")
    return cc


@router.patch("/{clamp_connection_id}", response_model=ClampConnectionRead)
async def update_clamp_connection(
    clamp_connection_id: int,
    payload: ClampConnectionUpdate,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("clamp_connections:write")),
):
    cc = await clamp_connection_crud.get(db, clamp_connection_id)
    if cc is None:
        raise HTTPException(status_code=404, detail="Clamp connection not found")
    changes = payload.model_dump(exclude_unset=True)
    cc = await clamp_connection_crud.update(db, cc, changes)
    await audit_crud.log(
        db,
        actor=actor,
        action="update",
        resource_type="ClampConnection",
        resource_id=cc.id,
        description=audit_crud.describe_update("ClampConnection", cc.id, changes),
    )
    return cc


@router.delete("/{clamp_connection_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_clamp_connection(
    clamp_connection_id: int,
    db: AsyncSession = Depends(get_db),
    actor: User = Depends(require_permission("clamp_connections:delete")),
):
    cc = await clamp_connection_crud.get(db, clamp_connection_id)
    if cc is None:
        raise HTTPException(status_code=404, detail="Clamp connection not found")
    label = (
        f"{cc.min_mm}–{cc.max_mm} mm"
        if cc.min_mm is not None
        else f"{cc.min_in}–{cc.max_in} in"
    )
    await clamp_connection_crud.delete(db, cc)
    await audit_crud.log(
        db,
        actor=actor,
        action="delete",
        resource_type="ClampConnection",
        resource_id=clamp_connection_id,
        description=audit_crud.describe_delete(
            "ClampConnection", clamp_connection_id, label
        ),
    )