package config

import (
	"fmt"
	"os"
)

// Config holds runtime configuration loaded from environment variables.
type Config struct {
	AuthToken string
	Port      string
	DBPath    string
	Timezone  string
}

// Load reads configuration from environment variables, returning an error if
// required variables are missing.
func Load() (*Config, error) {
	token := os.Getenv("AUTH_TOKEN")
	if token == "" {
		return nil, fmt.Errorf("AUTH_TOKEN environment variable is required")
	}

	port := os.Getenv("PORT")
	if port == "" {
		port = "8080"
	}

	dbPath := os.Getenv("DB_PATH")
	if dbPath == "" {
		dbPath = "wotra.db"
	}

	tz := os.Getenv("TZ")
	if tz == "" {
		tz = "UTC"
	}

	return &Config{
		AuthToken: token,
		Port:      port,
		DBPath:    dbPath,
		Timezone:  tz,
	}, nil
}