package email

import (
	"strings"
	"sync"
	"testing"

	"carrotskin/pkg/config"

	"go.uber.org/zap"
)

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

func TestEmailManager_Disabled(t *testing.T) {
	resetEmailOnce()
	cfg := config.EmailConfig{Enabled: false}
	if err := Init(cfg, zap.NewNop()); err != nil {
		t.Fatalf("Init disabled err: %v", err)
	}
	svc := MustGetService()
	if err := svc.SendVerificationCode("to@test.com", "123456", "email_verification"); err == nil {
		t.Fatalf("expected error when disabled")
	}
}

func TestEmailManager_SendFailsWithInvalidSMTP(t *testing.T) {
	resetEmailOnce()
	cfg := config.EmailConfig{
		Enabled:  true,
		SMTPHost: "127.0.0.1",
		SMTPPort: 1, // invalid/closed port to trigger error quickly
		Username: "user",
		Password: "pwd",
		FromName: "name",
	}
	_ = Init(cfg, zap.NewNop())
	svc := MustGetService()
	if err := svc.SendVerificationCode("to@test.com", "123456", "reset_password"); err == nil {
		t.Fatalf("expected send error with invalid smtp")
	}
}

func TestEmailManager_SubjectAndBody(t *testing.T) {
	svc := &Service{cfg: config.EmailConfig{FromName: "name", Username: "user"}, logger: zap.NewNop()}
	if subj := svc.getSubject("email_verification"); subj == "" {
		t.Fatalf("subject empty")
	}
	body := svc.getBody("123456", "change_email")
	if !strings.Contains(body, "123456") || !strings.Contains(body, "更换邮箱") {
		t.Fatalf("body content mismatch")
	}
}