"""
应用配置模块
使用 Pydantic Settings 管理环境变量
"""
from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """应用配置类"""

    # 应用基础配置
    APP_NAME: str = "ACG Blog"
    APP_VERSION: str = "0.1.0"
    DEBUG: bool = True

    # 数据库配置
    DB_HOST: str = "localhost"
    DB_PORT: int = 5432
    DB_USER: str = "postgres"
    DB_PASSWORD: str = "postgres"
    DB_NAME: str = "acg_blog"

    # Redis 配置
    REDIS_HOST: str = "localhost"
    REDIS_PORT: int = 6379
    REDIS_DB: int = 0

    # JWT 配置
    SECRET_KEY: str = "your-secret-key-change-in-production"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
    REFRESH_TOKEN_EXPIRE_DAYS: int = 7

    # CORS 配置
    BACKEND_CORS_ORIGINS: list[str] = [
        "http://localhost:5173",
        "http://localhost:3000",
    ]

    @property
    def DATABASE_URL(self) -> str:
        """生成数据库连接 URL"""
        return f"postgres://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"

    @property
    def DATABASE_URL_ASYNC(self) -> str:
        """生成异步数据库连接 URL"""
        return f"asyncpg://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"

    @property
    def REDIS_URL(self) -> str:
        """生成 Redis 连接 URL"""
        return f"redis://{self.REDIS_HOST}:{self.REDIS_PORT}/{self.REDIS_DB}"

    class Config:
        env_file = ".env"
        case_sensitive = True


@lru_cache()
def get_settings() -> Settings:
    """获取配置单例"""
    return Settings()


settings = get_settings()