package email

import (
	"carrotskin/pkg/config"
	"sync"
	"testing"

	"go.uber.org/zap/zaptest"
)

func resetEmail() {
	serviceInstance = nil
	once = sync.Once{}
}

// TestGetService_NotInitialized 测试未初始化时获取邮件服务
func TestGetService_NotInitialized(t *testing.T) {
	resetEmail()
	_, err := GetService()
	if err == nil {
		t.Error("未初始化时应该返回错误")
	}

	expectedError := "邮件服务未初始化，请先调用 email.Init()"
	if err.Error() != expectedError {
		t.Errorf("错误消息 = %q, want %q", err.Error(), expectedError)
	}
}

// TestMustGetService_Panic 测试MustGetService在未初始化时panic
func TestMustGetService_Panic(t *testing.T) {
	resetEmail()
	defer func() {
		if r := recover(); r == nil {
			t.Error("MustGetService 应该在未初始化时panic")
		}
	}()

	_ = MustGetService()
}

// TestInit_Email 测试邮件服务初始化
func TestInit_Email(t *testing.T) {
	resetEmail()
	cfg := config.EmailConfig{
		Enabled:  false,
		SMTPHost: "smtp.example.com",
		SMTPPort: 587,
		Username: "user@example.com",
		Password: "password",
		FromName: "noreply@example.com",
	}

	logger := zaptest.NewLogger(t)

	err := Init(cfg, logger)
	if err != nil {
		t.Errorf("Init() 错误 = %v, want nil", err)
	}

	// 验证可以获取服务
	service, err := GetService()
	if err != nil {
		t.Errorf("GetService() 错误 = %v, want nil", err)
	}
	if service == nil {
		t.Error("GetService() 返回的服务不应为nil")
	}
}