import { Locator, Page, expect } from '@playwright/test';
import { Header } from './Header';

/**
 * The public catalogue, and the states it shows instead of one.
 *
 * The item card locator is the one place in the suite that knows the storefront
 * renders items into `.item-card` — three specs reached for that class directly,
 * and two others used `.ant-col`, which is antd's grid rather than anything this
 * application owns. Both break on an antd upgrade, in files that have nothing to
 * do with the upgrade.
 */
export class StorefrontPage {
  readonly header: Header;
  readonly filtersButton: Locator;
  readonly privacyPolicyLink: Locator;
  /**
   * The chip row summarising what is filtered, which lives on the storefront
   * rather than in the drawer. Scoping matters: the drawer carries a "Clear
   * all" of its own, so an unscoped one matches both.
   */
  readonly activeFilters: Locator;
  /** Shown instead of the grid when filters match nothing. */
  readonly noMatchesNotice: Locator;
  /** Shown instead of that when a favorites filter is set with no session. */
  readonly favoritesNeedSignInNotice: Locator;

  /**
   * The three things the catalogue can say instead of listing items. Named
   * together because the distinction between them is the point: telling a
   * customer "No items yet" while the server is broken reads as an empty shop
   * and hides the outage, so several tests assert one is showing and another
   * is not.
   */
  readonly emptyNotice: Locator;
  readonly loadFailureNotice: Locator;
  readonly retryButton: Locator;

  /** What the nearest error boundary renders when the grid itself throws. */
  readonly catalogueBoundaryHeading: Locator;
  /** The paging control under the grid (#269). */
  readonly pagination: Locator;
  /**
   * Where the catalogue says how many items it has.
   *
   * A class locator rather than a role, matching how this file already reaches
   * `.item-card` — antd gives the total no role of its own, and this is the one
   * place in the suite that knows where it lives.
   */
  readonly resultCount: Locator;

  constructor(private readonly page: Page) {
    this.header = new Header(page);
    this.filtersButton = page.getByRole('button', { name: /Filters/ });
    this.privacyPolicyLink = page.getByRole('link', { name: 'Privacy Policy' });
    this.activeFilters = page.getByRole('group', { name: 'Active filters' });
    this.noMatchesNotice = page.getByText('No items match these filters');
    this.favoritesNeedSignInNotice = page.getByText('Sign in to see the items you have favorited');

    this.emptyNotice = page.getByText('No items yet');
    this.loadFailureNotice = page.getByText("Couldn't load items");
    this.retryButton = page.getByRole('button', { name: 'Retry' });

    this.catalogueBoundaryHeading = page.getByRole('heading', { name: "The item list didn't load" });

    this.pagination = page.locator('.ant-pagination');
    this.resultCount = page.locator('.ant-pagination-total-text');
  }

  async goto(): Promise<void> {
    await this.page.goto('/');
  }

  /**
   * How many items the catalogue says it has, in total, across every page.
   *
   * The number rather than the text, so a test can assert a result set grew or
   * shrank without knowing what it grew from. That is the whole reason #269
   * added a visible count: two assertions used to name a fixture and expect it
   * in the unfiltered grid, which no paginated catalogue can promise.
   */
  async totalItems(): Promise<number> {
    // Waits rather than reading straight away. The control is not rendered
    // until there is something to count, so reading during the initial load
    // used to return 0 and quietly make "the result set shrank" assertions
    // compare against nothing.
    await this.resultCount.waitFor();
    const text = (await this.resultCount.textContent()) ?? '';
    const digits = /(\d+)/.exec(text);
    if (digits === null) throw new Error(`no count in the pagination total: "${text}"`);
    return Number(digits[1]);
  }

  /**
   * Goes to the storefront and waits for the session to settle.
   *
   * Navigating remounts the app, so the session is briefly still resolving. The
   * favorite control deliberately ignores clicks in that window rather than
   * wrongly prompting a signed-in customer to sign in, so a test that clicks
   * immediately gets nothing and no error. Waiting for the header is what a real
   * customer sees settle too.
   */
  async gotoSignedIn(): Promise<void> {
    await this.goto();
    await this.header.waitForSignedIn();
  }

  /** One item's card, located by the name shown on it. */
  card(name: string): Locator {
    return this.page.locator('.item-card').filter({ hasText: name });
  }

  addToCartButton(name: string): Locator {
    return this.card(name).getByRole('button', { name: 'Add to Cart' });
  }

  /**
   * The heart, in whichever state it is currently in.
   *
   * Located page-wide rather than inside the card: the storefront paginates as
   * items accumulate, and the control is named for the item anyway, so scoping
   * to a card buys nothing and breaks when the card is on another page.
   */
  favoriteToggle(name: string): Locator {
    return this.page.getByRole('button', { name: new RegExp(`(Add|Remove) ${name}`) });
  }

  /**
   * The two settled states, named separately because the tests assert on the
   * transition between them — a favorite that took is a "Remove" control, and
   * one that did not is still an "Add".
   */
  addToFavoritesButton(name: string): Locator {
    return this.page.getByRole('button', { name: `Add ${name} to favorites` });
  }

  removeFromFavoritesButton(name: string): Locator {
    return this.page.getByRole('button', { name: `Remove ${name} from favorites` });
  }

  async openFilters(): Promise<void> {
    await this.filtersButton.click();
  }

  /**
   * The item's whole grid cell rather than its card.
   *
   * The SOLD ribbon is rendered outside the card, so a test asserting on it has
   * to reach the cell — and it has to be scoped to this item, because sold items
   * from earlier runs share the page.
   */
  gridCell(name: string): Locator {
    return this.page.locator('.ant-col').filter({ hasText: name });
  }

  /**
   * The availability segment.
   *
   * antd's Segmented hides the real radio behind a styled label, so the input is
   * found by role but cannot be clicked. The label carries a title attribute,
   * which is the same handle this suite uses for antd Select options.
   */
  async chooseAvailability(label: string): Promise<void> {
    await this.page.getByTitle(label, { exact: true }).click();
  }

  removeFilterChip(name: string): Locator {
    return this.page.getByRole('button', { name: `Remove filter ${name}` });
  }

  /**
   * The chip itself rather than its remove button, for asserting how it looks.
   *
   * antd expresses a tag's colour as an `ant-tag-<colour>` class, so the chip
   * element is what carries it — the button inside only inherits the text
   * colour.
   */
  filterChip(name: string): Locator {
    return this.activeFilters.locator('.ant-tag').filter({ hasText: name });
  }

  /** A tag as rendered on a product card, which is where its colour is set. */
  cardTag(itemName: string, tagName: string): Locator {
    return this.card(itemName).locator('.ant-tag').filter({ hasText: tagName });
  }

  async clearAllFilters(): Promise<void> {
    await this.activeFilters.getByRole('button', { name: 'Clear all' }).click();
  }

  /**
   * Waits until the catalogue has rendered something.
   *
   * A test that asserts an item is absent needs to know the list arrived and did
   * not contain it, rather than that it asserted before the fetch resolved —
   * which passes for the wrong reason and keeps passing when the filter breaks.
   */
  async waitForAnyItem(): Promise<void> {
    await expect(this.page.locator('.item-card').first()).toBeVisible();
  }
}