"""설정 관리 — 환경변수 기반"""

from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    # DB
    POSTGRES_DB: str = "ev_charging"
    POSTGRES_USER: str = "evuser"
    POSTGRES_PASSWORD: str = "evpass1234"
    POSTGRES_HOST: str = "postgres"
    POSTGRES_PORT: int = 5432

    # Redis
    REDIS_HOST: str = "redis"
    REDIS_PORT: int = 6379

    # Steve
    STEVE_BASE_URL: str = "https://s1.byunc.com/steve"
    STEVE_API_USER: str = "admin"
    STEVE_API_PASSWORD: str = "changeme"

    # 토스페이먼츠
    TOSS_CLIENT_KEY: str = ""
    TOSS_SECRET_KEY: str = ""

    # 요금 (원/kWh)
    ELECTRICITY_RATE: int = 120
    SERVICE_MARGIN: int = 50

    # JWT
    JWT_SECRET: str = "change-me"
    JWT_ALGORITHM: str = "HS256"
    JWT_EXPIRE_MINUTES: int = 1440

    # 서버
    DEBUG: bool = True

    @property
    def database_url(self) -> str:
        return (
            f"postgresql+asyncpg://{self.POSTGRES_USER}:{self.POSTGRES_PASSWORD}"
            f"@{self.POSTGRES_HOST}:{self.POSTGRES_PORT}/{self.POSTGRES_DB}"
        )

    @property
    def database_url_sync(self) -> str:
        return (
            f"postgresql://{self.POSTGRES_USER}:{self.POSTGRES_PASSWORD}"
            f"@{self.POSTGRES_HOST}:{self.POSTGRES_PORT}/{self.POSTGRES_DB}"
        )

    @property
    def redis_url(self) -> str:
        return f"redis://{self.REDIS_HOST}:{self.REDIS_PORT}/0"

    @property
    def total_rate(self) -> int:
        """총 충전 단가 (원/kWh)"""
        return self.ELECTRICITY_RATE + self.SERVICE_MARGIN

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"


@lru_cache
def get_settings() -> Settings:
    return Settings()