"""
Config Service - provides read-only access to static configuration files.
"""
from __future__ import annotations

import json
import os
from typing import Any, Dict

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware

APP_NAME = "config-service"
API_V1 = "/api/v1"
# 在容器内挂载了项目根到 /workspace
PROJECT_ROOT = os.environ.get("PROJECT_ROOT", "/workspace")
CONFIG_DIR = os.path.join(PROJECT_ROOT, "config")
SYSTEM_CONFIG_PATH = os.path.join(CONFIG_DIR, "config.json")
ANALYSIS_CONFIG_PATH = os.path.join(CONFIG_DIR, "analysis-config.json")

app = FastAPI(title=APP_NAME, version="0.1.0")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


def _read_json_file(path: str) -> Dict[str, Any]:
    if not os.path.exists(path):
        raise HTTPException(status_code=404, detail=f"配置文件不存在: {os.path.basename(path)}")
    try:
        with open(path, "r", encoding="utf-8") as f:
            return json.load(f)
    except json.JSONDecodeError as e:
        raise HTTPException(status_code=500, detail=f"配置文件格式错误: {e}") from e
    except OSError as e:
        raise HTTPException(status_code=500, detail=f"读取配置文件失败: {e}") from e


@app.get("/")
async def root() -> Dict[str, Any]:
    return {"status": "ok", "name": APP_NAME}


@app.get(f"{API_V1}/system")
async def get_system_config() -> Dict[str, Any]:
    """
    返回系统基础配置（纯文件内容，不包含数据库覆盖）。
    """
    return _read_json_file(SYSTEM_CONFIG_PATH)


@app.get(f"{API_V1}/analysis-modules")
async def get_analysis_modules() -> Dict[str, Any]:
    """
    返回分析模块配置（原样透传）。
    """
    return _read_json_file(ANALYSIS_CONFIG_PATH)