// SPDX-License-Identifier: AGPL-3.0-or-later
package config

import (
	"errors"
	"os"
)

type Config struct {
	Port            string
	DBPath          string
	FirebaseKeyPath string
	PairingCode     string
	FrigateURL      string
	FrigateUser     string
	FrigatePassword string
}

func Load() (*Config, error) {
	c := &Config{
		Port:            getenv("RELAY_PORT", "8080"),
		DBPath:          getenv("RELAY_DB_PATH", "/data/relay.db"),
		FirebaseKeyPath: os.Getenv("RELAY_FIREBASE_KEY_PATH"),
		PairingCode:     os.Getenv("RELAY_PAIRING_CODE"),
		FrigateURL:      os.Getenv("FRIGATE_URL"),
		FrigateUser:     os.Getenv("FRIGATE_USER"),
		FrigatePassword: os.Getenv("FRIGATE_PASSWORD"),
	}
	if c.FirebaseKeyPath == "" {
		return nil, errors.New("RELAY_FIREBASE_KEY_PATH is required")
	}
	if c.PairingCode == "" || len(c.PairingCode) < 6 {
		return nil, errors.New("RELAY_PAIRING_CODE must be at least 6 chars (use: openssl rand -hex 3)")
	}
	if c.FrigateURL == "" {
		return nil, errors.New("FRIGATE_URL is required (e.g. http://localhost:5000)")
	}
	// FRIGATE_USER + FRIGATE_PASSWORD optional — empty means Frigate has auth disabled.
	return c, nil
}

func getenv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}