"""StockLocation CRUD endpoints."""

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

from app.api.deps import get_current_user, require_permission
from app.db.session import get_async_session
from app.models import User, StockLocation
from app.schemas.stock_location import (
    StockLocationCreateRequest,
    StockLocationUpdateRequest,
    StockLocationResponse,
    StockLocationListResponse,
)

router = APIRouter(prefix="/stock-locations", tags=["stock-locations"])


@router.get("", response_model=StockLocationListResponse)
async def list_stock_locations(
    page: int = Query(1, ge=1),
    size: int = Query(20, ge=1, le=100),
    search: str | None = Query(None, description="Search in name"),
    current_user: User = Depends(require_permission("equipment:read")),
    session: AsyncSession = Depends(get_async_session),
):
    """List stock locations with search and pagination."""
    account_id = current_user.account_id
    base_q = select(StockLocation).where(StockLocation.account_id == account_id)

    if search:
        pattern = f"%{search}%"
        base_q = base_q.where(StockLocation.name.ilike(pattern))

    count_q = select(func.count()).select_from(base_q.subquery())
    total = (await session.execute(count_q)).scalar() or 0

    q = base_q.order_by(StockLocation.name).offset((page - 1) * size).limit(size)
    result = await session.execute(q)
    items = result.scalars().all()

    return StockLocationListResponse(
        items=[StockLocationResponse.model_validate(i) for i in items],
        total=total,
        page=page,
        size=size,
    )


@router.post("", response_model=StockLocationResponse, status_code=status.HTTP_201_CREATED)
async def create_stock_location(
    body: StockLocationCreateRequest,
    current_user: User = Depends(require_permission("equipment:write")),
    session: AsyncSession = Depends(get_async_session),
):
    """Create a new stock location."""
    account_id = current_user.account_id

    # If this is set as default, unset others
    if body.is_default:
        await session.execute(
            select(StockLocation)
            .where(StockLocation.account_id == account_id, StockLocation.is_default == True)  # noqa: E712
        )

    loc = StockLocation(account_id=account_id, **body.model_dump())
    session.add(loc)
    await session.commit()
    await session.refresh(loc)
    return StockLocationResponse.model_validate(loc)


@router.get("/{location_id}", response_model=StockLocationResponse)
async def get_stock_location(
    location_id: str,
    current_user: User = Depends(require_permission("equipment:read")),
    session: AsyncSession = Depends(get_async_session),
):
    """Get a specific stock location."""
    account_id = current_user.account_id
    result = await session.execute(
        select(StockLocation).where(
            StockLocation.id == location_id,
            StockLocation.account_id == account_id,
        )
    )
    loc = result.scalars().first()
    if not loc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Stock location not found")
    return StockLocationResponse.model_validate(loc)


@router.put("/{location_id}", response_model=StockLocationResponse)
async def update_stock_location(
    location_id: str,
    body: StockLocationUpdateRequest,
    current_user: User = Depends(require_permission("equipment:write")),
    session: AsyncSession = Depends(get_async_session),
):
    """Update a stock location."""
    account_id = current_user.account_id
    result = await session.execute(
        select(StockLocation).where(
            StockLocation.id == location_id,
            StockLocation.account_id == account_id,
        )
    )
    loc = result.scalars().first()
    if not loc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Stock location not found")

    update_data = body.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(loc, field, value)

    await session.commit()
    await session.refresh(loc)
    return StockLocationResponse.model_validate(loc)


@router.delete("/{location_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_stock_location(
    location_id: str,
    current_user: User = Depends(require_permission("equipment:delete")),
    session: AsyncSession = Depends(get_async_session),
):
    """Delete a stock location."""
    account_id = current_user.account_id
    result = await session.execute(
        select(StockLocation).where(
            StockLocation.id == location_id,
            StockLocation.account_id == account_id,
        )
    )
    loc = result.scalars().first()
    if not loc:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Stock location not found")

    await session.delete(loc)
    await session.commit()
    return None