feat: complete remaining Go backend modules

backend/internal/templates/service_test.go

@@ -0,0 +1,116 @@
+package templates
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+)
+
+type memoryCatalog struct {
+	items []Template
+	err   error
+}
+
+func (catalog *memoryCatalog) ListTemplates(_ context.Context, owner string) ([]Template, error) {
+	if catalog.err != nil {
+		return nil, catalog.err
+	}
+	out := []Template{}
+	for _, item := range catalog.items {
+		if item.OwnerID == owner {
+			out = append(out, item)
+		}
+	}
+	return out, nil
+}
+func (catalog *memoryCatalog) CreateTemplate(_ context.Context, item Template) (Template, error) {
+	if catalog.err != nil {
+		return Template{}, catalog.err
+	}
+	catalog.items = append(catalog.items, item)
+	return item, nil
+}
+func (catalog *memoryCatalog) UpdateTemplate(_ context.Context, owner, id string, patch Patch, now time.Time) (Template, bool, error) {
+	if catalog.err != nil {
+		return Template{}, false, catalog.err
+	}
+	for index := range catalog.items {
+		if catalog.items[index].OwnerID != owner || catalog.items[index].ID != id {
+			continue
+		}
+		applyPatch(&catalog.items[index], patch)
+		catalog.items[index].UpdatedAt = now
+		return catalog.items[index], true, nil
+	}
+	return Template{}, false, nil
+}
+func (catalog *memoryCatalog) DeleteTemplate(_ context.Context, owner, id string) (Template, bool, error) {
+	if catalog.err != nil {
+		return Template{}, false, catalog.err
+	}
+	for index, item := range catalog.items {
+		if item.OwnerID != owner || item.ID != id {
+			continue
+		}
+		catalog.items = append(catalog.items[:index], catalog.items[index+1:]...)
+		return item, true, nil
+	}
+	return Template{}, false, nil
+}
+
+func TestServiceNormalizesAndScopesTemplates(t *testing.T) {
+	now := time.Date(2026, 8, 13, 12, 0, 0, 0, time.UTC)
+	catalog := &memoryCatalog{}
+	service := NewService(catalog, func() time.Time { return now }, func() string { return "tmpl_fixed" })
+	created, err := service.Create(context.Background(), "owner-a", CreateCommand{
+		Name: "  Campaign  ", Description: " ", Prompt: "  make it vivid  ",
+		PreviewImageURL: "/uploads/preview.png", SortOrder: 2,
+		Settings: Settings{Engine: "jimeng", Width: 2048, Height: 2048, Scale: 50},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if created.ID != "tmpl_fixed" || created.OwnerID != "owner-a" || created.Name != "Campaign" || created.Prompt != "make it vivid" {
+		t.Fatalf("unexpected template: %#v", created)
+	}
+	if created.Description != "" || created.CreatedAt != now || created.UpdatedAt != now {
+		t.Fatalf("unexpected normalized values: %#v", created)
+	}
+	if _, err := service.Create(context.Background(), "owner-a", CreateCommand{Name: "x", Prompt: "p", PreviewImageURL: "ftp://bad"}); !errors.Is(err, ErrInvalidTemplate) {
+		t.Fatalf("expected invalid preview URL, got %v", err)
+	}
+	items, err := service.List(context.Background(), "owner-b")
+	if err != nil || len(items) != 0 {
+		t.Fatalf("scope leak: %#v %v", items, err)
+	}
+}
+
+func TestServiceUpdateDeleteAndNotFound(t *testing.T) {
+	now := time.Now().UTC()
+	catalog := &memoryCatalog{items: []Template{{ID: "t1", OwnerID: "owner", Name: "old", Prompt: "p", Settings: Settings{}, CreatedAt: now, UpdatedAt: now}}}
+	service := NewService(catalog, func() time.Time { return now.Add(time.Hour) }, nil)
+	name := "  new  "
+	updated, err := service.Update(context.Background(), "owner", "t1", UpdateCommand{Name: &name})
+	if err != nil || updated.Name != "new" {
+		t.Fatalf("update: %#v %v", updated, err)
+	}
+	if _, err := service.Update(context.Background(), "other", "t1", UpdateCommand{Name: &name}); !errors.Is(err, ErrNotFound) {
+		t.Fatalf("expected scoped not found, got %v", err)
+	}
+	deleted, err := service.Delete(context.Background(), "owner", "t1")
+	if err != nil || deleted.ID != "t1" {
+		t.Fatalf("delete: %#v %v", deleted, err)
+	}
+	if _, err := service.Delete(context.Background(), "owner", "t1"); !errors.Is(err, ErrNotFound) {
+		t.Fatalf("expected not found, got %v", err)
+	}
+}
+
+func TestServicePropagatesInfrastructureFailures(t *testing.T) {
+	want := errors.New("database unavailable")
+	service := NewService(&memoryCatalog{err: want}, nil, nil)
+	if _, err := service.List(context.Background(), "owner"); !errors.Is(err, want) {
+		t.Fatalf("expected wrapped cause, got %v", err)
+	}
+}