from functools import lru_cache

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


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

    log_level: str = "INFO"
    total_timeout_seconds: float = Field(10.0, gt=0, le=60)
    connect_timeout_seconds: float = Field(3.0, gt=0, le=30)
    read_timeout_seconds: float = Field(5.0, gt=0, le=30)
    max_redirects: int = Field(5, ge=0, le=10)
    user_agent: str = "endpoint-monitor/0.1"

    @model_validator(mode="after")
    def timeout_parts_fit(self) -> "Settings":
        if self.connect_timeout_seconds > self.total_timeout_seconds:
            raise ValueError("connect timeout cannot exceed total timeout")
        if self.read_timeout_seconds > self.total_timeout_seconds:
            raise ValueError("read timeout cannot exceed total timeout")
        return self


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