from __future__ import annotations

import logging
from functools import lru_cache
from pathlib import Path
from typing import Literal

from pydantic import Field, HttpUrl
from pydantic_settings import BaseSettings, SettingsConfigDict


BACKEND_ROOT_DIR = Path(__file__).resolve().parents[1]
ENV_FILE_PATH = BACKEND_ROOT_DIR / ".env"


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=ENV_FILE_PATH,
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="ignore",
    )

    app_env: Literal["development", "production", "test"] = "development"
    app_host: str = "0.0.0.0"
    app_port: int = 8000
    app_log_level: Literal["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"] = "INFO"
    app_timezone: str = "Europe/Berlin"
    app_name: str = "Homelab Dashboard API"
    app_version: str = "0.1.0"
    app_root_dir: Path = Path(__file__).resolve().parents[2]

    cors_allow_origins: list[str] = Field(default_factory=lambda: ["http://localhost:3000"])

    request_timeout_seconds: float = Field(default=5.0, gt=0)
    cache_ttl_overview_seconds: int = Field(default=15, ge=1)
    cache_ttl_system_seconds: int = Field(default=15, ge=1)
    cache_ttl_services_seconds: int = Field(default=15, ge=1)
    cache_ttl_storage_seconds: int = Field(default=30, ge=1)

    beszel_base_url: HttpUrl | None = None
    beszel_api_token: str | None = None
    beszel_admin_email: str | None = None
    beszel_admin_password: str | None = None

    docker_proxy_base_url: HttpUrl | None = None

    uptime_kuma_base_url: HttpUrl | None = None
    uptime_kuma_api_key: str | None = None
    uptime_kuma_username: str | None = None
    uptime_kuma_password: str | None = None

    home_assistant_base_url: HttpUrl | None = None
    home_assistant_token: str | None = None

    adguard_base_url: HttpUrl | None = None
    adguard_username: str | None = None
    adguard_password: str | None = None

    scrutiny_base_url: HttpUrl | None = None


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()


def configure_logging(level: str) -> None:
    logging.basicConfig(
        level=getattr(logging, level.upper(), logging.INFO),
        format="%(asctime)s %(levelname)s [%(name)s] %(message)s",
    )