package config

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

type Config struct {
	Environment     string
	HTTPAddress     string
	DatabaseURL     string
	SessionSecret   string
	CookieSecure    bool
	ShutdownTimeout time.Duration
}

func Load() (Config, error) {
	cfg := Config{
		Environment:     value("BELL_ENV", "development"),
		HTTPAddress:     value("BELL_HTTP_ADDRESS", "127.0.0.1:8082"),
		DatabaseURL:     os.Getenv("BELL_DATABASE_URL"),
		SessionSecret:   os.Getenv("BELL_SESSION_SECRET"),
		ShutdownTimeout: 10 * time.Second,
	}
	if raw := os.Getenv("BELL_SHUTDOWN_SECONDS"); raw != "" {
		seconds, err := strconv.Atoi(raw)
		if err != nil || seconds < 1 || seconds > 300 {
			return Config{}, fmt.Errorf("BELL_SHUTDOWN_SECONDS must be between 1 and 300")
		}
		cfg.ShutdownTimeout = time.Duration(seconds) * time.Second
	}
	if cfg.DatabaseURL == "" {
		return Config{}, fmt.Errorf("BELL_DATABASE_URL is required")
	}
	if len(cfg.SessionSecret) < 32 {
		return Config{}, fmt.Errorf("BELL_SESSION_SECRET must contain at least 32 characters")
	}
	cfg.CookieSecure = cfg.Environment == "production"
	return cfg, nil
}

func value(name, fallback string) string {
	if value := os.Getenv(name); value != "" {
		return value
	}
	return fallback
}