package config

import (
	"os"
	"sync"
)

type Config struct {
	BaseURL  string
	Username string
	Password string
	Semester string
	TWFID    string
}

var (
	cfg     *Config
	cfgOnce sync.Once
)

func Load() *Config {
	cfgOnce.Do(func() {
		cfg = &Config{
			BaseURL:  getEnv("JWTS_BASE_URL", "http://jwts.hitwh.edu.cn"),
			Username: getEnv("JWTS_USERNAME", ""),
			Password: getEnv("JWTS_PASSWORD", ""),
			Semester: getEnv("JWTS_SEMESTER", "2025-20262"),
			TWFID:    getEnv("JWTS_TWFID", ""),
		}
	})
	return cfg
}

func Get() *Config {
	if cfg == nil {
		return Load()
	}
	return cfg
}

func getEnv(key, defaultValue string) string {
	val := os.Getenv(key)
	if val == "" {
		return defaultValue
	}
	return val
}