from typing import List
from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict
from enum import Enum


class Environment(str, Enum):
    """环境枚举"""
    LOCAL = "local"
    DEVELOPMENT = "dev"
    STAGING = "staging"
    PRODUCTION = "prod"


class LogLevel(str, Enum):
    """日志级别枚举"""
    DEBUG = "DEBUG"
    INFO = "INFO"
    WARNING = "WARNING"
    ERROR = "ERROR"
    CRITICAL = "CRITICAL"


class Settings(BaseSettings):
    """
    应用配置类
    自动从 .env 文件和环境变量中读取配置
    """

    # ---------- 基础配置 ----------
    APP_NAME: str = Field(
        default="Lottery Server",
        description="应用名称"
    )

    APP_DESCRIPTION: str = Field(
        default="一个自己看的彩票信息服务",
        description="应用描述"
    )

    ENVIRONMENT: Environment = Field(
        default=Environment.LOCAL,
        description="运行环境"
    )

    # ---------- 服务器配置 ----------
    HOST: str = Field(
        default="0.0.0.0",
        description="服务监听地址"
    )
    PORT: int = Field(
        default=8000,
        ge=1,
        le=65535,
        description="服务监听端口"
    )

    # ---------- 数据库MYSQL配置 ----------
    MYSQL_USER: str = Field(
        default='root',
        description="MySQL用户名"
    )
    MYSQL_PASSWORD: str = Field(
        default='Azure1314',
        description="MySQL密码"
    )
    MYSQL_HOST: str = Field(
        default='127.0.0.1',
        description="MySQL主机地址"
    )
    MYSQL_PORT: int = Field(
        default=3306,
        ge=1,
        le=65535,
        description="MySQL端口"
    )
    MYSQL_DB: str = Field(
        default='lottery_server',
        description="MySQL数据库名"
    )

    DATABASE_POOL_SIZE: int = Field(
        default=10,
        ge=1,
        le=100,
        description="数据库连接池大小"
    )
    DATABASE_MAX_OVERFLOW: int = Field(
        default=20,
        description="连接池最大溢出连接数"
    )
    DATABASE_ECHO: bool = Field(
        default=False,
        description="是否打印SQL语句"
    )

    # ---------- CORS配置 ----------
    ALLOWED_ORIGINS: List[str] = Field(
        default=["*"],
        description="允许的CORS源"
    )
    ALLOWED_METHODS: List[str] = Field(
        default=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
        description="允许的HTTP方法"
    )
    ALLOWED_HEADERS: List[str] = Field(
        default=["*"],
        description="允许的HTTP头"
    )

    # ---------- 限流配置 ----------
    RATE_LIMIT_PER_MINUTE: int = Field(
        default=60,
        ge=1,
        description="每分钟请求限制"
    )
    RATE_LIMIT_PER_DAY: int = Field(
        default=10000,
        ge=1,
        description="每天请求限制"
    )

    # ---------- 文件上传配置 ----------
    MAX_UPLOAD_SIZE_MB: int = Field(
        default=10,
        ge=1,
        le=100,
        description="最大上传文件大小（MB）"
    )
    ALLOWED_UPLOAD_EXTENSIONS: List[str] = Field(
        default=[".jpg", ".jpeg", ".png", ".pdf", ".docx"],
        description="允许上传的文件扩展名"
    )
    UPLOAD_DIR: str = Field(
        default="./uploads",
        description="文件上传目录"
    )

    # ---------- 缓存配置 ----------
    CACHE_TTL_SECONDS: int = Field(
        default=300,
        ge=1,
        description="缓存过期时间（秒）"
    )

    # ---------- 计算属性 ----------
    @property
    def mysql_url(self) -> str:
        """MySQL连接URL"""
        # 连接url格式：mysql+pymysql://user:password@host:port/dbname
        return f"mysql+pymysql://{self.MYSQL_USER}:{self.MYSQL_PASSWORD}@{self.MYSQL_HOST}:{self.MYSQL_PORT}/{self.MYSQL_DB}?charset=utf8mb4"

    @property
    def is_production(self) -> bool:
        """是否为生产环境"""
        return self.ENVIRONMENT == Environment.PRODUCTION

    @property
    def is_development(self) -> bool:
        """是否为开发环境"""
        return self.ENVIRONMENT in [Environment.LOCAL, Environment.DEVELOPMENT]

    # ---------- 配置加载设置 ----------
    model_config = SettingsConfigDict(
        env_file=".env.local",  # .env文件路径
        env_file_encoding="utf-8",  # 文件编码
        case_sensitive=True,  # 环境变量名大小写敏感
        extra="ignore",  # 忽略未定义的额外字段
        validate_default=True,  # 验证默认值
        # secrets_dir="/run/secrets",       # Docker secrets支持（可选）
    )


# 创建全局单例配置实例
settings = Settings()


# 导出配置实例
__all__ = ["settings", "Environment", "LogLevel"]