#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
提供配置，单例
"""
import os

import yaml

from metagpt.logs import logger

from metagpt.const import PROJECT_ROOT
from metagpt.utils.singleton import Singleton
from metagpt.tools import SearchEngineType


class NotConfiguredException(Exception):
    """Exception raised for errors in the configuration.

    Attributes:
        message -- explanation of the error
    """

    def __init__(self, message="The required configuration is not set"):
        self.message = message
        super().__init__(self.message)


class Config(metaclass=Singleton):
    """
    常规使用方法：
    config = Config("config.yaml")
    secret_key = config.get_key("MY_SECRET_KEY")
    print("Secret key:", secret_key)
    """
    _instance = None
    key_yaml_file = PROJECT_ROOT / 'config/key.yaml'
    default_yaml_file = PROJECT_ROOT / 'config/config.yaml'

    def __init__(self, yaml_file=default_yaml_file):
        self._configs = {}
        self._init_with_config_files_and_env(self._configs, yaml_file)
        logger.info('Config loading done.')
        self.openai_api_key = self._get('OPENAI_API_KEY')
        if not self.openai_api_key or 'YOUR_API_KEY' == self.openai_api_key:
            raise NotConfiguredException("Set OPENAI_API_KEY first")
        self.openai_api_base = self._get('OPENAI_API_BASE')
        if not self.openai_api_base or 'YOUR_API_BASE' == self.openai_api_base:
            logger.info("Set OPENAI_API_BASE in case of network issues")
        self.openai_api_type = self._get('OPENAI_API_TYPE')
        self.openai_api_version = self._get('OPENAI_API_VERSION')
        self.openai_api_rpm = self._get('RPM', 3)
        self.openai_api_model = self._get('OPENAI_API_MODEL', "gpt-4")
        self.max_tokens_rsp = self._get('MAX_TOKENS', 2048)
        self.deployment_id = self._get('DEPLOYMENT_ID')

        self.serpapi_api_key = self._get('SERPAPI_API_KEY')
        self.google_api_key = self._get('GOOGLE_API_KEY')
        self.google_cse_id = self._get('GOOGLE_CSE_ID')
        self.search_engine = self._get('SEARCH_ENGINE', SearchEngineType.SERPAPI_GOOGLE)
        self.max_budget = self._get('MAX_BUDGET', 10.0)
        self.total_cost = 0.0

    def _init_with_config_files_and_env(self, configs: dict, yaml_file):
        """从config/key.yaml / config/config.yaml / env三处按优先级递减加载"""
        configs.update(os.environ)

        for _yaml_file in [yaml_file, self.key_yaml_file]:
            if not _yaml_file.exists():
                continue

            # 加载本地 YAML 文件
            with open(_yaml_file, 'r', encoding="utf-8") as file:
                yaml_data = yaml.safe_load(file)
                if not yaml_data:
                    continue
                os.environ.update({k: v for k, v in yaml_data.items() if isinstance(v, str)})
                configs.update(yaml_data)

    def _get(self, *args, **kwargs):
        return self._configs.get(*args, **kwargs)

    def get(self, key, *args, **kwargs):
        """从config/key.yaml / config/config.yaml / env三处找值，找不到报错"""
        value = self._get(key, *args, **kwargs)
        if value is None:
            raise ValueError(f"Key '{key}' not found in environment variables or in the YAML file")
        return value


CONFIG = Config()