import argparse
import os
import sys
from functools import lru_cache

from dotenv import load_dotenv

from core.settings.app_settings import AppSettings
from core.settings.cache_path_settings import CachePathSettings
from core.settings.db_settings import DBSettings
from core.settings.jwt_settings import JwtSettings
from core.settings.log_settings import LogSettings
from core.settings.redis_settings import RedisSettings
from core.settings.upload_settings import UploadSettings


class Settings:
		"""
		获取配置
		"""
		
		def __init__(self):
				self.parse_cli_args()
				# 清除lru_cache缓存，确保配置重新加载
				self.get_app_settings.cache_clear()
		
		@lru_cache()
		def get_app_settings(self):
				"""
				获取应用配置
				"""
				# 实例化应用配置模型
				app_settings = AppSettings()
				return app_settings
		
		@lru_cache()
		def get_jwt_settings(self):
				"""
				获取Jwt配置
				"""
				# 实例化Jwt配置模型
				return JwtSettings()
		
		@lru_cache()
		def get_database_settings(self):
				"""
				获取数据库配置
				"""
				# 实例化数据库配置模型
				return DBSettings()
		
		@lru_cache()
		def get_redis_settings(self):
				"""
				获取Redis配置
				"""
				# 实例化Redis配置模型
				return RedisSettings()
		
		@lru_cache()
		def get_log_settings(self):
				"""
				获取日志配置
				"""
				return LogSettings()
		
		@lru_cache()
		def get_upload_settings(self):
				"""
				获取数据库配置
				"""
				# 实例上传配置
				return UploadSettings()
		
		@lru_cache()
		def get_cache_settings(self):
				"""
				获取缓存配置
				"""
				# 实例化缓存配置模型
				return CachePathSettings()
		
		@staticmethod
		def parse_cli_args():
				"""
				解析命令行参数
				"""
				if 'uvicorn' in sys.argv[0]:
						# 使用uvicorn启动时，命令行参数需要按照uvicorn的文档进行配置，无法自定义参数
						pass
				else:
						# 使用argparse定义命令行参数
						parser = argparse.ArgumentParser(description='命令行参数')
						parser.add_argument('--env', type=str, default='', help='运行环境')
						# 解析命令行参数
						args = parser.parse_args()
						# 设置环境变量，如果未设置命令行参数，默认APP_ENV为dev
						os.environ['APP_ENV'] = args.env if args.env else 'dev'
				
				# 读取运行环境
				run_env = os.environ.get('APP_ENV', '')
				# 运行环境未指定时默认加载.env.dev
				env_file = '.env.dev'
				# 运行环境不为空时按命令行参数加载对应.env文件
				if run_env != '':
						env_file = f'.env.{run_env}'
				# 加载配置
				load_dotenv(env_file, override=True)