"""Fences Router - geofence management API endpoints."""

import math

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

from app.dependencies import require_write
from app.database import get_db
from app.schemas import (
    APIResponse,
    DeviceFenceBindRequest,
    FenceConfigCreate,
    FenceConfigResponse,
    FenceConfigUpdate,
    FenceDeviceDetail,
    PaginatedList,
)
from app.services import fence_service

router = APIRouter(prefix="/api/fences", tags=["Fences"])


@router.get("", response_model=APIResponse[PaginatedList[FenceConfigResponse]])
async def list_fences(
    is_active: bool | None = Query(default=None),
    search: str | None = Query(default=None),
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
):
    records, total = await fence_service.get_fences(db, page, page_size, is_active, search)
    return APIResponse(
        data=PaginatedList(
            items=[FenceConfigResponse.model_validate(r) for r in records],
            total=total, page=page, page_size=page_size,
            total_pages=math.ceil(total / page_size) if total else 0,
        )
    )


@router.get("/all-active", response_model=APIResponse[list[FenceConfigResponse]])
async def get_all_active(db: AsyncSession = Depends(get_db)):
    fences = await fence_service.get_all_active_fences(db)
    return APIResponse(data=[FenceConfigResponse.model_validate(f) for f in fences])


@router.get("/{fence_id}", response_model=APIResponse[FenceConfigResponse])
async def get_fence(fence_id: int, db: AsyncSession = Depends(get_db)):
    fence = await fence_service.get_fence(db, fence_id)
    if fence is None:
        raise HTTPException(status_code=404, detail="Fence not found")
    return APIResponse(data=FenceConfigResponse.model_validate(fence))


@router.post("", response_model=APIResponse[FenceConfigResponse], status_code=201, dependencies=[Depends(require_write)])
async def create_fence(body: FenceConfigCreate, db: AsyncSession = Depends(get_db)):
    fence = await fence_service.create_fence(db, body)
    return APIResponse(message="Fence created", data=FenceConfigResponse.model_validate(fence))


@router.put("/{fence_id}", response_model=APIResponse[FenceConfigResponse], dependencies=[Depends(require_write)])
async def update_fence(fence_id: int, body: FenceConfigUpdate, db: AsyncSession = Depends(get_db)):
    fence = await fence_service.update_fence(db, fence_id, body)
    if fence is None:
        raise HTTPException(status_code=404, detail="Fence not found")
    return APIResponse(message="Fence updated", data=FenceConfigResponse.model_validate(fence))


@router.delete("/{fence_id}", response_model=APIResponse, dependencies=[Depends(require_write)])
async def delete_fence(fence_id: int, db: AsyncSession = Depends(get_db)):
    if not await fence_service.delete_fence(db, fence_id):
        raise HTTPException(status_code=404, detail="Fence not found")
    return APIResponse(message="Fence deleted")


# ---------------------------------------------------------------------------
# Device-Fence Binding endpoints
# ---------------------------------------------------------------------------


@router.get(
    "/{fence_id}/devices",
    response_model=APIResponse[list[FenceDeviceDetail]],
    summary="获取围栏绑定的设备列表",
)
async def get_fence_devices(fence_id: int, db: AsyncSession = Depends(get_db)):
    fence = await fence_service.get_fence(db, fence_id)
    if fence is None:
        raise HTTPException(status_code=404, detail="Fence not found")
    items = await fence_service.get_fence_devices(db, fence_id)
    return APIResponse(data=[FenceDeviceDetail(**item) for item in items])


@router.post(
    "/{fence_id}/devices",
    response_model=APIResponse,
    dependencies=[Depends(require_write)],
    summary="绑定设备到围栏",
)
async def bind_devices(fence_id: int, body: DeviceFenceBindRequest, db: AsyncSession = Depends(get_db)):
    result = await fence_service.bind_devices_to_fence(db, fence_id, body.device_ids)
    if result.get("error"):
        raise HTTPException(status_code=404, detail=result["error"])
    return APIResponse(
        message=f"绑定完成: 新增{result['created']}, 已绑定{result['already_bound']}, 未找到{result['not_found']}",
        data=result,
    )


@router.delete(
    "/{fence_id}/devices",
    response_model=APIResponse,
    dependencies=[Depends(require_write)],
    summary="解绑设备与围栏",
)
async def unbind_devices(fence_id: int, body: DeviceFenceBindRequest, db: AsyncSession = Depends(get_db)):
    count = await fence_service.unbind_devices_from_fence(db, fence_id, body.device_ids)
    return APIResponse(message=f"已解绑 {count} 个设备")