#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from functools import lru_cache

from pydantic import BaseSettings, root_validator


class Settings(BaseSettings):
    # Env Config
    ENVIRONMENT: str

    # Env MySQL
    DB_HOST: str
    DB_PORT: int
    DB_USER: str
    DB_PASSWORD: str

    # Env Redis
    REDIS_HOST: str
    REDIS_PORT: int
    REDIS_PASSWORD: str
    REDIS_DATABASE: int

    # Env APScheduler Redis
    APS_REDIS_HOST: str
    APS_REDIS_PORT: int
    APS_REDIS_PASSWORD: str
    APS_REDIS_DATABASE: int

    # Env Token
    TOKEN_SECRET_KEY: str  # 密钥 secrets.token_urlsafe(32))

    # FastAPI
    TITLE: str = 'FastAPI'
    VERSION: str = '0.0.1'
    DESCRIPTION: str = 'FastAPI Best Architecture'
    DOCS_URL: str | None = '/v1/docs'
    REDOCS_URL: str | None = '/v1/redocs'
    OPENAPI_URL: str | None = '/v1/openapi'

    @root_validator
    def validator_api_url(cls, values):
        if values['ENVIRONMENT'] == 'pro':
            values['OPENAPI_URL'] = None
        return values

    # Uvicorn
    UVICORN_HOST: str = '127.0.0.1'
    UVICORN_PORT: int = 8000
    UVICORN_RELOAD: bool = True

    # Static Server
    STATIC_FILES: bool = False

    # MySQL
    DB_ECHO: bool = False
    DB_DATABASE: str = 'fba'
    DB_CHARSET: str = 'utf8mb4'

    # Redis
    REDIS_TIMEOUT: int = 5

    # APScheduler Redis
    APS_REDIS_TIMEOUT: int = 10

    # APScheduler Default
    APS_COALESCE: bool = False  # 是否合并运行
    APS_MAX_INSTANCES: int = 3  # 最大实例数
    APS_MISFIRE_GRACE_TIME: int = 60  # 任务错过执行时间后，最大容错时间，过期后不再执行，单位：秒

    # Token
    TOKEN_ALGORITHM: str = 'HS256'  # 算法
    TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 1  # token 时效 60 * 24 * 1 = 1 天
    TOKEN_URL: str = '/v1/auth/users/login'

    # Log
    LOG_FILE_NAME: str = 'fba.log'

    # Middleware
    MIDDLEWARE_CORS: bool = True
    MIDDLEWARE_GZIP: bool = True
    MIDDLEWARE_ACCESS: bool = False

    class Config:
        # https://docs.pydantic.dev/usage/settings/#dotenv-env-support
        env_file = '.env'
        env_file_encoding = 'utf-8'


@lru_cache
def get_settings():
    """读取配置优化写法"""
    return Settings()


settings = get_settings()