"""Configuration management using pydantic-settings."""

from pydantic import field_validator
from pydantic_settings import BaseSettings
from typing import Optional


class Settings(BaseSettings):
    """Application configuration loaded from environment variables."""

    # App
    APP_NAME: str = "Sanctum Chronicler"
    APP_ENV: str = "development"
    DEBUG: bool = False

    @field_validator("DEBUG", mode="before")
    @classmethod
    def parse_debug(cls, value: object) -> bool:
        """Parse permissive runtime DEBUG values from shell environments."""
        if isinstance(value, bool):
            return value
        if isinstance(value, str):
            normalized = value.strip().lower()
            if normalized in {"1", "true", "t", "yes", "y", "on", "debug"}:
                return True
            if normalized in {
                "0",
                "false",
                "f",
                "no",
                "n",
                "off",
                "release",
                "prod",
                "production",
            }:
                return False
        return False

    # Database
    DATABASE_URL: str = "postgresql+asyncpg://sanctum:password@localhost:5432/sanctum"

    # Twitch
    TWITCH_CLIENT_ID: Optional[str] = None
    TWITCH_CLIENT_SECRET: Optional[str] = None
    TWITCH_BOT_USERNAME: Optional[str] = None
    TWITCH_CHANNEL_NAME: Optional[str] = None

    # LLM
    LLM_PROVIDER: Optional[str] = None  # "openai", "ollama", "lm_studio", or None
    LLM_BASE_URL: Optional[str] = None
    LLM_API_KEY: Optional[str] = None
    LLM_MODEL: str = "gpt-3.5-turbo"

    # Agent loop
    AGENT_LOOP_INTERVAL_SECONDS: float = 60.0

    # Export
    EXPORT_PATH: str = "exports"

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


settings = Settings()