"""
Application configuration module.
Manages JWT and OAuth settings from YAML configuration file.
Supports dev/prod environments via APP_ENV environment variable.
"""
import os
import secrets
import logging
import yaml
from pathlib import Path
from typing import Dict, Any

logger = logging.getLogger(__name__)


def get_config_path() -> Path:
    """
    根据 APP_ENV 环境变量获取配置文件路径
    APP_ENV=prod -> config.prod.yaml
    APP_ENV=dev -> config.dev.yaml
    默认 -> config.yaml (兼容旧配置)
    """
    app_env = os.getenv("APP_ENV", "").lower()
    base_path = Path(__file__).parent
    
    if app_env == "prod":
        config_file = base_path / "config.prod.yaml"
        logger.info("使用生产环境配置: config.prod.yaml")
    elif app_env == "dev":
        config_file = base_path / "config.dev.yaml"
        logger.info("使用开发环境配置: config.dev.yaml")
    else:
        # 兼容旧的 config.yaml
        print("默认使用开发环境")
        config_file = base_path / "config.dev.yaml"
        if app_env:
            logger.warning(f"未知的 APP_ENV 值: {app_env}，使用默认 config.yaml")
    
    return config_file


class Settings:
    """Application settings loaded from config.yaml."""
    
    def __init__(self):
        """Load configuration from YAML file."""
        config_path = get_config_path()
        
        if not config_path.exists():
            raise FileNotFoundError(f"配置文件不存在: {config_path}")
        
        with open(config_path, 'r', encoding='utf-8') as f:
            config = yaml.safe_load(f)
        
        # 记录当前环境（统一转小写）
        self.APP_ENV = os.getenv("APP_ENV", "default").lower()
        print(f"[Config] APP_ENV={self.APP_ENV}, 配置文件={config_path}")
        
        # JWT Settings
        jwt_config = config.get('jwt', {})
        self.JWT_SECRET_KEY = jwt_config.get('secret_key', secrets.token_urlsafe(32))
        self.JWT_ALGORITHM = jwt_config.get('algorithm', 'HS256')
        self.ACCESS_TOKEN_EXPIRE_MINUTES = jwt_config.get('access_token_expire_minutes', 15)
        self.REFRESH_TOKEN_EXPIRE_DAYS = jwt_config.get('refresh_token_expire_days', 7)
        
        # Database Settings
        db_config = config.get('database', {})
        self.DATABASE_TYPE = db_config.get('type', 'sqlite')
        self.DATABASE_PATH = db_config.get('path', 'annotation_platform.db')
        
        # MySQL Settings
        mysql_config = db_config.get('mysql', {})
        self.MYSQL_HOST = mysql_config.get('host', 'localhost')
        self.MYSQL_PORT = mysql_config.get('port', 3306)
        self.MYSQL_USER = mysql_config.get('user', 'root')
        self.MYSQL_PASSWORD = mysql_config.get('password', '')
        self.MYSQL_DATABASE = mysql_config.get('database', 'annotation_platform')
        
        # OAuth Settings
        oauth_config = config.get('oauth', {})
        self.OAUTH_ENABLED = oauth_config.get('enabled', False)
        self.OAUTH_BASE_URL = oauth_config.get('base_url', '')
        self.OAUTH_CLIENT_ID = oauth_config.get('client_id', '')
        self.OAUTH_CLIENT_SECRET = oauth_config.get('client_secret', '')
        self.OAUTH_REDIRECT_URI = oauth_config.get('redirect_uri', '')
        self.OAUTH_SCOPE = oauth_config.get('scope', 'profile email')
        
        # OAuth Endpoints
        self.OAUTH_AUTHORIZE_ENDPOINT = oauth_config.get('authorize_endpoint', '/oauth/authorize')
        self.OAUTH_TOKEN_ENDPOINT = oauth_config.get('token_endpoint', '/oauth/token')
        self.OAUTH_USERINFO_ENDPOINT = oauth_config.get('userinfo_endpoint', '/oauth/userinfo')
        self.OAUTH_REVOKE_ENDPOINT = oauth_config.get('revoke_endpoint', '/oauth/revoke')
        
        # Server Settings
        server_config = config.get('server', {})
        self.SERVER_HOST = server_config.get('host', '0.0.0.0')
        self.SERVER_PORT = server_config.get('port', 8000)
        self.SERVER_RELOAD = server_config.get('reload', True)
        
        # Warn if using default JWT secret in production
        if self.APP_ENV == "prod" and self.JWT_SECRET_KEY in ['your-secret-key-here', 'CHANGE_THIS_TO_A_SECURE_RANDOM_KEY']:
            logger.warning("生产环境使用默认 JWT_SECRET_KEY，请立即修改 config.prod.yaml！")
        elif self.JWT_SECRET_KEY == 'your-secret-key-here':
            logger.warning(f"使用默认 JWT_SECRET_KEY，生产环境请修改配置文件！(当前环境: {self.APP_ENV})")


# Create settings instance
settings = Settings()