"""
models.dev 外部模型数据代理
"""

import json

from typing import Any, Optional

import httpx
from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import JSONResponse

from src.clients import get_redis_client
from src.core.logger import logger
from src.models.database import User
from src.utils.auth_utils import require_admin

router = APIRouter()

CACHE_KEY = "aether:external:models_dev"
CACHE_TTL = 15 * 60  # 15 分钟

# 标记官方/一手提供商，前端可据此过滤第三方转售商
OFFICIAL_PROVIDERS = {
    "anthropic",  # Claude 官方
    "openai",  # OpenAI 官方
    "google",  # Gemini 官方
    "google-vertex",  # Google Vertex AI
    "azure",  # Azure OpenAI
    "amazon-bedrock",  # AWS Bedrock
    "xai",  # Grok 官方
    "meta",  # Llama 官方
    "deepseek",  # DeepSeek 官方
    "mistral",  # Mistral 官方
    "cohere",  # Cohere 官方
    "zhipuai",  # 智谱 AI 官方
    "alibaba",  # 阿里云（通义千问）
    "minimax",  # MiniMax 官方
    "moonshot",  # 月之暗面（Kimi）
    "baichuan",  # 百川智能
    "ai21",  # AI21 Labs
}


async def _get_cached_data() -> Optional[dict[str, Any]]:
    """从 Redis 获取缓存数据"""
    redis = await get_redis_client()
    if redis is None:
        return None
    try:
        cached = await redis.get(CACHE_KEY)
        if cached:
            result: dict[str, Any] = json.loads(cached)
            return result
    except Exception as e:
        logger.warning(f"读取 models.dev 缓存失败: {e}")
    return None


async def _set_cached_data(data: dict) -> None:
    """将数据写入 Redis 缓存"""
    redis = await get_redis_client()
    if redis is None:
        return
    try:
        await redis.setex(CACHE_KEY, CACHE_TTL, json.dumps(data, ensure_ascii=False))
    except Exception as e:
        logger.warning(f"写入 models.dev 缓存失败: {e}")


def _mark_official_providers(data: dict[str, Any]) -> dict[str, Any]:
    """为每个提供商标记是否为官方"""
    result = {}
    for provider_id, provider_data in data.items():
        result[provider_id] = {
            **provider_data,
            "official": provider_id in OFFICIAL_PROVIDERS,
        }
    return result


@router.get("/external")
async def get_external_models(_: User = Depends(require_admin)) -> JSONResponse:
    """
    获取 models.dev 的模型数据（代理请求，解决跨域问题）
    数据缓存 15 分钟（使用 Redis，多 worker 共享）
    每个提供商会标记 official 字段，前端可据此过滤
    """
    # 检查缓存
    cached = await _get_cached_data()
    if cached is not None:
        # 兼容旧缓存：如果没有 official 字段则补全并回写
        try:
            needs_mark = False
            for provider_data in cached.values():
                if not isinstance(provider_data, dict) or "official" not in provider_data:
                    needs_mark = True
                    break
            if needs_mark:
                marked_cached = _mark_official_providers(cached)
                await _set_cached_data(marked_cached)
                return JSONResponse(content=marked_cached)
        except Exception as e:
            logger.warning(f"处理 models.dev 缓存数据失败，将直接返回原缓存: {e}")
        return JSONResponse(content=cached)

    # 从 models.dev 获取数据
    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            response = await client.get("https://models.dev/api.json")
            response.raise_for_status()
            data = response.json()

            # 标记官方提供商
            marked_data = _mark_official_providers(data)

            # 写入缓存
            await _set_cached_data(marked_data)

            return JSONResponse(content=marked_data)
    except httpx.TimeoutException:
        raise HTTPException(status_code=504, detail="请求 models.dev 超时")
    except httpx.HTTPStatusError as e:
        raise HTTPException(
            status_code=502, detail=f"models.dev 返回错误: {e.response.status_code}"
        )
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"获取外部模型数据失败: {str(e)}")


@router.delete("/external/cache")
async def clear_external_models_cache(_: User = Depends(require_admin)) -> dict:
    """清除 models.dev 缓存"""
    redis = await get_redis_client()
    if redis is None:
        return {"cleared": False, "message": "Redis 未启用"}
    try:
        await redis.delete(CACHE_KEY)
        return {"cleared": True}
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"清除缓存失败: {str(e)}")