"""REST: системная статистика и сводный статус."""
from __future__ import annotations

import os

from fastapi import APIRouter, HTTPException, Request

from ..auth import require_role
from ..config import Storage, save_config
from ..runtime import runtime
from ..services.system import system_stats

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

ALLOWED_SEGMENTS = (60, 120, 300, 600, 900)   # 1 / 2 / 5 / 10 / 15 минут
VERSION_FILE = os.environ.get("NVR_VERSION_FILE", "/app/VERSION")


def app_version() -> str:
    try:
        with open(VERSION_FILE, "r", encoding="utf-8") as fh:
            return fh.read().strip()
    except OSError:
        return "0.0.0"


@router.get("/system")
async def get_system() -> dict:
    stats = system_stats(runtime.config)
    stats["cameras"] = [s.to_dict() for s in runtime.supervisor.statuses()]
    stats["archive_size_bytes"] = await runtime.db.total_size()
    stats["version"] = app_version()
    return stats


@router.get("/health")
async def health() -> dict:
    return {"status": "ok"}


@router.post("/storage")
async def update_storage(request: Request) -> dict:
    """Смена размера сегмента записи (1/5/10/15 мин). Перезапускает рекордеры."""
    require_role(request, "admin")
    body = await request.json()
    try:
        seg = int(body.get("segment_seconds"))
    except (TypeError, ValueError):
        raise HTTPException(400, "segment_seconds должен быть числом")
    if seg not in ALLOWED_SEGMENTS:
        raise HTTPException(400, "допустимо 60 / 300 / 600 / 900 секунд")

    st = runtime.config.storage
    runtime.config.storage = Storage(
        path=st.path, quota_gb=st.quota_gb,
        retention_days=st.retention_days, segment_seconds=seg,
    )
    save_config(runtime.config)
    await runtime.supervisor.restart_all()
    return {"segment_seconds": seg}