from functools import lru_cache

from sqlalchemy.engine import URL
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

    app_name: str = "Plast Track MVP"
    database_url: str | None = None
    postgres_host: str = "database"
    postgres_port: int = 5432
    postgres_db: str = "plasttrack"
    postgres_user: str = "plasttrack"
    postgres_password: str = "plasttrack"
    mqtt_host: str = "mqtt"
    mqtt_port: int = 1883
    mqtt_topic: str = "plasttrack/machines/+/events"
    mqtt_client_id: str = "plast-track-backend"
    frontend_origin: str | None = None
    frontend_origins: str = "http://localhost:5173,http://127.0.0.1:5173,http://localhost:5174,http://127.0.0.1:5174"
    downtime_check_interval_sec: int = 5
    database_startup_retries: int = 30
    database_startup_retry_delay_sec: float = 2.0

    @property
    def sqlalchemy_database_url(self) -> str:
        if self.database_url:
            return self.database_url
        return URL.create(
            "postgresql+psycopg",
            username=self.postgres_user,
            password=self.postgres_password,
            host=self.postgres_host,
            port=self.postgres_port,
            database=self.postgres_db,
        ).render_as_string(hide_password=False)

    @property
    def cors_allowed_origins(self) -> list[str]:
        configured_origins = [origin.strip() for origin in self.frontend_origins.split(",") if origin.strip()]
        if self.frontend_origin:
            configured_origins.append(self.frontend_origin.strip())
        return list(dict.fromkeys(configured_origins))


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