"""UI-настройки, сохраняемые в .env.json (раздел "ui").

Хранятся на сервере → значение общее для всех клиентов и переживает перезапуск.
"""
from __future__ import annotations

import json
import os

from fastapi import APIRouter, HTTPException, Request

from .auth import COOKIE_NAME, auth_manager, require_role

DEFAULT_UI = {"live_transcode": False, "archive_transcode": False}
DEFAULT_OPT = {"single_main_stream": True, "mode_16plus": False}   # серверная политика Live view


def _path() -> str:
    return os.environ.get("NVR_SETTINGS", ".env.json")


def load_ui() -> dict:
    try:
        with open(_path(), "r", encoding="utf-8") as fh:
            data = json.load(fh)
        ui = data.get("ui") or {}
    except (OSError, json.JSONDecodeError):
        ui = {}
    return {**DEFAULT_UI, **{k: ui[k] for k in DEFAULT_UI if k in ui}}


def save_ui(patch: dict) -> dict:
    path = _path()
    try:
        with open(path, "r", encoding="utf-8") as fh:
            data = json.load(fh)
    except (OSError, json.JSONDecodeError):
        data = {}
    merged = load_ui()
    for k in DEFAULT_UI:
        if k in patch:
            merged[k] = bool(patch[k])
    data["ui"] = merged
    with open(path, "w", encoding="utf-8") as fh:
        json.dump(data, fh, ensure_ascii=False, indent=2)
    return merged


def load_optimization() -> dict:
    try:
        with open(_path(), "r", encoding="utf-8") as fh:
            data = json.load(fh)
        opt = data.get("optimization") or {}
    except (OSError, json.JSONDecodeError):
        opt = {}
    return {**DEFAULT_OPT, **{k: bool(opt[k]) for k in DEFAULT_OPT if k in opt}}


def save_optimization(patch: dict) -> dict:
    path = _path()
    try:
        with open(path, "r", encoding="utf-8") as fh:
            data = json.load(fh)
    except (OSError, json.JSONDecodeError):
        data = {}
    merged = load_optimization()
    for k in DEFAULT_OPT:
        if k in patch:
            merged[k] = bool(patch[k])
    data["optimization"] = merged
    with open(path, "w", encoding="utf-8") as fh:
        json.dump(data, fh, ensure_ascii=False, indent=2)
    return merged


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


@router.get("/settings")
async def get_settings() -> dict:
    return load_ui()


@router.post("/settings")
async def update_settings(request: Request) -> dict:
    body = await request.json()
    return save_ui(body)


@router.get("/optimization")
async def get_optimization() -> dict:
    """Политика Live view; читают все авторизованные клиенты."""
    return load_optimization()


@router.post("/optimization")
async def update_optimization(request: Request) -> dict:
    """Менять может только суперадмин и только с подтверждением пароля."""
    require_role(request, "superadmin")
    body = await request.json()
    if not auth_manager.verify_token_password(request.cookies.get(COOKIE_NAME),
                                              body.get("password", "")):
        raise HTTPException(403, "неверный пароль")
    return save_optimization(body)