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)
	}
}