from functools import lru_cache
from typing import Literal

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="MONITOR_", extra="ignore")

    host: str = "0.0.0.0"
    port: int = Field(default=8000, ge=1, le=65535)
    log_level: Literal["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"] = "INFO"
    connect_timeout_seconds: float = Field(default=2.0, gt=0, le=30)
    read_timeout_seconds: float = Field(default=5.0, gt=0, le=60)
    write_timeout_seconds: float = Field(default=5.0, gt=0, le=60)
    pool_timeout_seconds: float = Field(default=2.0, gt=0, le=30)
    max_redirects: int = Field(default=5, ge=0, le=10)
    max_connections: int = Field(default=50, ge=1, le=500)
    user_agent: str = Field(default="endpoint-monitor/1.0", min_length=1, max_length=100)


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