"""
app/config.py
─────────────
Central settings object built from environment variables via pydantic-settings.
All sensitive values must be supplied via the .env file or container env vars —
never hard-coded here.
"""
from __future__ import annotations

from typing import Optional

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        extra="allow",          # allow arbitrary env vars (forwarded to /api/config)
        case_sensitive=True,
    )

    # ── Database ──────────────────────────────────────────────────────────────
    DATABASE_URL: str

    # ── JWT / Authentication ──────────────────────────────────────────────────
    SECRET_KEY: str
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 120

    # ── CORS ──────────────────────────────────────────────────────────────────
    # Comma-separated list of allowed origins, e.g. "http://localhost:3000,https://pmdi.example.com"
    ALLOWED_ORIGINS: str = "http://localhost:3000"

    # ── Cron endpoint guard ───────────────────────────────────────────────────
    CRON_SECRET_TOKEN: str

    # ── Seed admin (first-boot only) ──────────────────────────────────────────
    ADMIN_USERNAME: str = "admin"
    ADMIN_PASSWORD: str = "changeme"

    # ── Mail sender identity ──────────────────────────────────────────────────
    MAIL_FROM: str = "noreply@example.com"
    MAIL_FROM_NAME: str = "PMDI Invoice System"

    # ── Mail Mode A – Authenticated TLS relay ─────────────────────────────────
    # All three must be set to activate Mode A.
    MAIL_RELAYHOST: Optional[str] = None            # "smtp.example.com:587"
    MAIL_RELAYHOST_USERNAME: Optional[str] = None
    MAIL_RELAYHOST_PASSWORD: Optional[str] = None

    # ── Mail Mode B – Simple container/host proxy relay ───────────────────────
    # Set to the hostname of the relay container (e.g. "postfix").
    MAIL_RELAY_HOST: Optional[str] = None


# Module-level singleton — import this everywhere instead of re-instantiating.
settings = Settings()