package config

import (
	"fmt"
	"os"
	"time"
)

type Config struct {
	DatabaseURL   string
	BindHost      string
	BridgeIdleTTL time.Duration
	HTTPAddr      string
	LogLevel      string
}

func Load() (Config, error) {
	cfg := Config{
		DatabaseURL:   os.Getenv("DATABASE_URL"),
		BindHost:      envOr("BIND_HOST", "0.0.0.0"),
		BridgeIdleTTL: envDur("BRIDGE_IDLE_TTL", 1*time.Minute),
		HTTPAddr:      envOr("HTTP_ADDR", ":8081"),
		LogLevel:      envOr("LOG_LEVEL", "info"),
	}
	if cfg.DatabaseURL == "" {
		return cfg, fmt.Errorf("DATABASE_URL required")
	}
	return cfg, nil
}

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

func envDur(key string, fallback time.Duration) time.Duration {
	v := os.Getenv(key)
	if v == "" {
		return fallback
	}
	d, err := time.ParseDuration(v)
	if err != nil {
		return fallback
	}
	return d
}