import json
from fastapi import HTTPException
import httpx

from log_config import logger

def update_config(config_data):
    for index, provider in enumerate(config_data['providers']):
        model_dict = {}
        for model in provider['model']:
            if type(model) == str:
                model_dict[model] = model
            if type(model) == dict:
                model_dict.update({new: old for old, new in model.items()})
        provider['model'] = model_dict
        config_data['providers'][index] = provider
    api_keys_db = config_data['api_keys']
    api_list = [item["api"] for item in api_keys_db]
    # logger.info(json.dumps(config_data, indent=4, ensure_ascii=False))
    return config_data, api_keys_db, api_list

# 读取YAML配置文件
async def load_config(app):
    import yaml
    try:
        with open('./api.yaml', 'r') as f:
            # 判断是否为空文件
            conf = yaml.safe_load(f)
            # conf = None
            if conf:
                config, api_keys_db, api_list = update_config(conf)
            else:
                # logger.error("配置文件 'api.yaml' 为空。请检查文件内容。")
                config, api_keys_db, api_list = [], [], []
    except FileNotFoundError:
        logger.error("配置文件 'api.yaml' 未找到。请确保文件存在于正确的位置。")
        config, api_keys_db, api_list = [], [], []
    except yaml.YAMLError:
        logger.error("配置文件 'api.yaml' 格式不正确。请检查 YAML 格式。")
        config, api_keys_db, api_list = [], [], []

    if config != []:
        return config, api_keys_db, api_list

    import os
    # 新增： 从环境变量获取配置URL并拉取配置
    config_url = os.environ.get('CONFIG_URL')
    if config_url:
        try:
            response = await app.state.client.get(config_url)
            # logger.info(f"Fetching config from {response.text}")
            response.raise_for_status()
            config_data = yaml.safe_load(response.text)
            # 更新配置
            # logger.info(config_data)
            if config_data:
                config, api_keys_db, api_list = update_config(config_data)
            else:
                logger.error(f"Error fetching or parsing config from {config_url}")
                config, api_keys_db, api_list = [], [], []
        except Exception as e:
            logger.error(f"Error fetching or parsing config from {config_url}: {str(e)}")
            config, api_keys_db, api_list = [], [], []
    return config, api_keys_db, api_list

def ensure_string(item):
    if isinstance(item, (bytes, bytearray)):
        return item.decode("utf-8")
    elif isinstance(item, str):
        return item
    elif isinstance(item, dict):
        return f"data: {json.dumps(item)}\n\n"
    else:
        return str(item)

import asyncio
async def error_handling_wrapper(generator, status_code=200):
    async def new_generator():
        try:
            yield ensure_string(first_item)
            async for item in generator:
                yield ensure_string(item)
        except (httpx.ReadError, asyncio.CancelledError) as e:
            logger.error(f"Network error in new_generator: {e}")
            raise HTTPException(status_code=503, detail=f"Stream interrupted: {str(e)}")
        except Exception as e:
            logger.exception(f"Error in new_generator: {e}")
            raise HTTPException(status_code=status_code, detail=f"Stream error: {str(e)}")

    try:
        first_item = await generator.__anext__()
        first_item_str = first_item
        if isinstance(first_item_str, (bytes, bytearray)):
            first_item_str = first_item_str.decode("utf-8")
        if isinstance(first_item_str, str):
            if first_item_str.startswith("data: "):
                first_item_str = first_item_str[6:]
            elif first_item_str.startswith("data:"):
                first_item_str = first_item_str[5:]
            if first_item_str.startswith("[DONE]"):
                logger.error("error_handling_wrapper [DONE]!")
                raise StopAsyncIteration
            try:
                first_item_str = json.loads(first_item_str)
            except json.JSONDecodeError:
                logger.error("error_handling_wrapper JSONDecodeError!" + repr(first_item_str))
                raise StopAsyncIteration
        if isinstance(first_item_str, dict) and 'error' in first_item_str:
            raise HTTPException(status_code=status_code, detail=f"{first_item_str}"[:300])

        wrapped_generator = new_generator()
        try:
            async for item in wrapped_generator:
                yield item
        except HTTPException as http_exc:
            raise HTTPException(status_code=status_code, detail=f"Wrapper error: {str(http_exc)}")
        except (httpx.ReadError, asyncio.CancelledError) as e:
            logger.error(f"Network error during streaming: {e}")
            raise HTTPException(status_code=503, detail=f"Stream interrupted: {str(e)}")
        except Exception as e:
            logger.exception(f"Unexpected error in error_handling_wrapper: {e}")
            raise HTTPException(status_code=status_code, detail=f"Unexpected error: {str(e)}")

    except StopAsyncIteration:
        raise HTTPException(status_code=status_code, detail="data: {'error': 'No data returned'}")
    except HTTPException as http_exc:
        raise HTTPException(status_code=status_code, detail=f"Wrapper error: {str(http_exc)}")
    except Exception as e:
        logger.exception(f"Error in error_handling_wrapper: {e}")
        raise HTTPException(status_code=status_code, detail=f"Wrapper error: {str(e)}")

# async def error_handling_wrapper(generator, status_code=200):
#     try:
#         first_item = await generator.__anext__()
#         first_item_str = first_item
#         if isinstance(first_item_str, (bytes, bytearray)):
#             first_item_str = first_item_str.decode("utf-8")
#         if isinstance(first_item_str, str):
#             if first_item_str.startswith("data: "):
#                 first_item_str = first_item_str[6:]
#             elif first_item_str.startswith("data:"):
#                 first_item_str = first_item_str[5:]
#             if first_item_str.startswith("[DONE]"):
#                 logger.error("error_handling_wrapper [DONE]!")
#                 raise StopAsyncIteration
#             try:
#                 first_item_str = json.loads(first_item_str)
#             except json.JSONDecodeError:
#                 logger.error("error_handling_wrapper JSONDecodeError!" + repr(first_item_str))
#                 raise StopAsyncIteration
#         if isinstance(first_item_str, dict) and 'error' in first_item_str:
#             # 如果第一个 yield 的项是错误信息，抛出 HTTPException
#             raise HTTPException(status_code=status_code, detail=f"{first_item_str}"[:300])

#         # 如果不是错误，创建一个新的生成器，首先yield第一个项，然后yield剩余的项
#         async def new_generator():
#             yield ensure_string(first_item)
#             async for item in generator:
#                 yield ensure_string(item)

#         return new_generator()

#     except StopAsyncIteration:
#         raise HTTPException(status_code=status_code, detail="data: {'error': 'No data returned'}")

def post_all_models(token, config, api_list):
    all_models = []
    unique_models = set()

    if token not in api_list:
        raise HTTPException(status_code=403, detail="Invalid or missing API Key")
    api_index = api_list.index(token)
    if config['api_keys'][api_index]['model']:
        for model in config['api_keys'][api_index]['model']:
            if "/" in model:
                provider = model.split("/")[0]
                model = model.split("/")[1]
                if model == "*":
                    for provider_item in config["providers"]:
                        if provider_item['provider'] != provider:
                            continue
                        for model_item in provider_item['model'].keys():
                            if model_item not in unique_models:
                                unique_models.add(model_item)
                                model_info = {
                                    "id": model_item,
                                    "object": "model",
                                    "created": 1720524448858,
                                    "owned_by": "uni-api"
                                    # "owned_by": provider_item['provider']
                                }
                                all_models.append(model_info)
                else:
                    for provider_item in config["providers"]:
                        if provider_item['provider'] != provider:
                            continue
                        for model_item in provider_item['model'].keys() :
                            if model_item not in unique_models and model_item == model:
                                unique_models.add(model_item)
                                model_info = {
                                    "id": model_item,
                                    "object": "model",
                                    "created": 1720524448858,
                                    "owned_by": "uni-api"
                                }
                                all_models.append(model_info)
                continue

            if model not in unique_models:
                unique_models.add(model)
                model_info = {
                    "id": model,
                    "object": "model",
                    "created": 1720524448858,
                    "owned_by": model
                }
                all_models.append(model_info)

    return all_models

def get_all_models(config):
    all_models = []
    unique_models = set()

    for provider in config["providers"]:
        for model in provider['model'].keys():
            if model not in unique_models:
                unique_models.add(model)
                model_info = {
                    "id": model,
                    "object": "model",
                    "created": 1720524448858,
                    "owned_by": "uni-api"
                }
                all_models.append(model_info)

    return all_models