from __future__ import annotations

from pathlib import Path

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import FileResponse

from backend.api.schemas import HealthResponse, SimulationStartRequest, SimulationStartResponse, SimulationStopResponse
from backend.services.simulation_manager import SimulationManager
from backend.utils import safe_join


def get_router(simulation_manager: SimulationManager, file_root: Path) -> APIRouter:
    router = APIRouter()

    @router.get("/health", response_model=HealthResponse)
    async def health() -> HealthResponse:
        return HealthResponse()

    @router.get("/api/devices")
    async def devices():
        runtime = simulation_manager.current()
        return {
            "data": [
                {
                    "device_id": "controlbox_01",
                    "device_type": "mock_vehicle",
                    "connected": bool(runtime and runtime.status == "running"),
                }
            ]
        }

    @router.post("/api/simulation/start", response_model=SimulationStartResponse)
    async def start_simulation(body: SimulationStartRequest) -> SimulationStartResponse:
        simulation_id = await simulation_manager.start(body.model_dump())
        return SimulationStartResponse(simulation_id=simulation_id)

    @router.post("/api/simulation/{simulation_id}/stop", response_model=SimulationStopResponse)
    async def stop_simulation(simulation_id: str) -> SimulationStopResponse:
        await simulation_manager.stop(simulation_id)
        return SimulationStopResponse(simulation_id=simulation_id, status="stopped")

    @router.get("/files/{file_path:path}")
    async def files(file_path: str):
        try:
            resolved = safe_join(file_root, file_path)
        except ValueError:
            raise HTTPException(status_code=400, detail="invalid path")
        if not resolved.exists() or not resolved.is_file():
            raise HTTPException(status_code=404, detail="not found")
        return FileResponse(str(resolved))

    return router