package notification

import (
	"strings"
	"testing"
)

func TestBuildMIMEMessageStructure(t *testing.T) {
	body := buildMIMEMessage(mimeMessage{
		MessageID: "abc@example.test",
		From:      "GuestGuard <no-reply@example.test>",
		To:        "to@example.test",
		Subject:   "Verify your GuestGuard email",
		Text:      "Hi Mira, please verify.",
		HTML:      "<p>Hi Mira, please verify.</p>",
	})
	s := string(body)
	checks := []string{
		"Message-ID: <abc@example.test>",
		"From: GuestGuard <no-reply@example.test>",
		"To: to@example.test",
		"Subject: Verify your GuestGuard email",
		"MIME-Version: 1.0",
		"Content-Type: multipart/alternative; boundary=",
		"Content-Type: text/plain; charset=UTF-8",
		"Content-Type: text/html; charset=UTF-8",
		"Hi Mira, please verify.",
		"<p>Hi Mira, please verify.</p>",
	}
	for _, want := range checks {
		if !strings.Contains(s, want) {
			t.Errorf("MIME body missing %q\n---\n%s", want, s)
		}
	}
}

func TestGenerateMessageIDIncludesDomain(t *testing.T) {
	id := generateMessageID("no-reply@example.test")
	if !strings.HasSuffix(id, "@example.test") {
		t.Fatalf("message id has wrong domain: %s", id)
	}
}

func TestGenerateMessageIDFallback(t *testing.T) {
	id := generateMessageID("not-an-email")
	if !strings.HasSuffix(id, "@guestguard.local") {
		t.Fatalf("expected fallback domain: %s", id)
	}
}