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

export interface Traveller {
  firstName: string;
  lastName: string;
  dateOfBirth?: string;
  passportNumber?: string;
}

/** The booking form. */
export class CheckoutPage {
  readonly travellerFieldsets: Locator;
  readonly addTraveller: Locator;
  readonly contactEmail: Locator;
  readonly contactPhone: Locator;
  readonly confirm: Locator;
  readonly total: Locator;
  readonly error: Locator;
  readonly seatsLeft: Locator;

  constructor(private readonly page: Page) {
    this.travellerFieldsets = page.locator('.pax');
    this.addTraveller = page.getByRole('button', { name: '+ Add traveller' });
    this.contactEmail = page.locator('#contactEmail');
    this.contactPhone = page.locator('#contactPhone');
    this.confirm = page.getByRole('button', { name: /Confirm booking|Confirming/ });
    this.total = page.locator('.fare-row.total strong');
    this.error = page.locator('.alert-error');
    this.seatsLeft = page.locator('.sum-list div', { hasText: 'Seats left' }).locator('dd');
  }

  async waitUntilReady(): Promise<void> {
    await expect(this.travellerFieldsets.first()).toBeVisible();
  }

  async totalAmount(): Promise<number> {
    const text = await this.total.innerText();
    return Number(text.replace(/[^0-9.]/g, ''));
  }

  /** Fills one traveller block, adding a row first if necessary. */
  async fillTraveller(index: number, traveller: Traveller): Promise<void> {
    // Wait for each added row to render before deciding whether another is
    // needed -- re-counting immediately races Angular and adds one too many.
    let count = await this.travellerFieldsets.count();
    while (count <= index) {
      await this.addTraveller.click();
      count += 1;
      await expect(this.travellerFieldsets).toHaveCount(count);
    }
    await this.page.locator(`#first-${index}`).fill(traveller.firstName);
    await this.page.locator(`#last-${index}`).fill(traveller.lastName);
    if (traveller.dateOfBirth) {
      await this.page.locator(`#dob-${index}`).fill(traveller.dateOfBirth);
    }
    if (traveller.passportNumber) {
      await this.page.locator(`#passport-${index}`).fill(traveller.passportNumber);
    }
  }

  async fillTravellers(travellers: Traveller[]): Promise<void> {
    for (let i = 0; i < travellers.length; i++) {
      await this.fillTraveller(i, travellers[i]);
    }
  }

  async removeTraveller(index: number): Promise<void> {
    await this.travellerFieldsets.nth(index).getByRole('button', { name: 'Remove' }).click();
  }

  /** Confirms and waits for the confirmation screen. */
  async confirmBooking(): Promise<void> {
    await this.confirm.click();
    await this.page.waitForURL(/\/bookings\/[0-9a-f-]+/);
  }
}