package user

import (
	"context"
	"strings"
	"testing"

	"git.golem15.com/golem15/summercms/modules/postcard"
)

// TestPolishMailSubjects renders every Polish template next to its -en twin
// and requires a subject of its own, so a Polish template with a copied
// English subject does not slip through.
func TestPolishMailSubjects(t *testing.T) {
	p := &Plugin{}
	cat := postcard.NewCatalog()
	if err := cat.Register(p.ID(), p.MailTemplatesFS(), p.MailTemplates(), p.MailLayouts()); err != nil {
		t.Fatal(err)
	}
	names := map[string]bool{}
	for _, name := range p.MailTemplates() {
		names[name] = true
	}
	vars := map[string]any{
		"name": "Ada", "Name": "Ada",
		"link": "https://example.com/link", "Link": "https://example.com/link",
		"code": "1!abc", "Code": "1!abc",
		"hours": 72, "Hours": 72,
		"login": "ada@example.test", "Login": "ada@example.test",
	}
	subject := func(t *testing.T, template string) string {
		t.Helper()
		mem := postcard.NewMemoryDriver()
		mailer := postcard.NewMailer(cat, mem, postcard.Options{From: "noreply@example.test"})
		if err := mailer.Send(context.Background(), postcard.Message{Template: template, To: []string{"ada@example.test"}, Vars: vars}); err != nil {
			t.Fatalf("%s: %v", template, err)
		}
		msgs := mem.Messages()
		if len(msgs) != 1 {
			t.Fatalf("%s: %d messages", template, len(msgs))
		}
		return msgs[0].Subject
	}
	pairs := 0
	for _, name := range p.MailTemplates() {
		if strings.HasSuffix(name, "-en") || !names[name+"-en"] {
			continue
		}
		pairs++
		pl, en := subject(t, name), subject(t, name+"-en")
		if pl == "" || pl == en {
			t.Errorf("%s: Polish subject %q, English subject %q", name, pl, en)
		}
	}
	if pairs == 0 {
		t.Fatal("no Polish/English template pairs")
	}
}