"""Configuration settings for OAuth backend"""

from typing import List, Optional
from pydantic_settings import BaseSettings
from pydantic import Field
import json


class Settings(BaseSettings):
    # Application
    environment: str = Field(default="dev", env="ENVIRONMENT")
    api_prefix: str = Field(default="/api/v1", env="API_PREFIX")
    secret_key: str = Field(..., env="SECRET_KEY")
    
    # MongoDB
    mongodb_url: str = Field(..., env="MONGODB_URL")
    database_name: str = Field(default="oauth_db", env="DATABASE_NAME")
    
    # Redis
    redis_url: str = Field(..., env="REDIS_URL")
    redis_db: int = Field(default=0, env="REDIS_DB")
    
    # JWT
    jwt_algorithm: str = Field(default="HS256", env="JWT_ALGORITHM")
    jwt_access_token_expire_minutes: int = Field(default=30, env="JWT_ACCESS_TOKEN_EXPIRE_MINUTES")
    jwt_refresh_token_expire_days: int = Field(default=7, env="JWT_REFRESH_TOKEN_EXPIRE_DAYS")
    
    # CORS
    cors_origins: List[str] = Field(default=["http://localhost:5173"], env="CORS_ORIGINS")
    cors_allow_credentials: bool = Field(default=True, env="CORS_ALLOW_CREDENTIALS")
    
    # Rate Limiting
    rate_limit_requests: int = Field(default=100, env="RATE_LIMIT_REQUESTS")
    rate_limit_period: int = Field(default=60, env="RATE_LIMIT_PERIOD")
    
    # Logging
    log_level: str = Field(default="INFO", env="LOG_LEVEL")
    log_path: str = Field(default="/var/log/oauth", env="LOG_PATH")
    
    # Admin
    admin_email: Optional[str] = Field(default="admin@oauth.local", env="ADMIN_EMAIL")
    admin_password: Optional[str] = Field(default="admin123", env="ADMIN_PASSWORD")
    
    # Session
    session_secret_key: str = Field(default="session-secret-key", env="SESSION_SECRET_KEY")
    session_cookie_name: str = Field(default="oauth_session", env="SESSION_COOKIE_NAME")
    session_expire_minutes: int = Field(default=1440, env="SESSION_EXPIRE_MINUTES")
    
    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        case_sensitive = False
        
        @classmethod
        def parse_env_var(cls, field_name: str, raw_val: str):
            if field_name == "cors_origins":
                return json.loads(raw_val) if isinstance(raw_val, str) else raw_val
            return raw_val


# Create settings instance
settings = Settings()