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

test.describe('Tracker Flow', () => {
  test.beforeEach(async ({ page }) => {
    // 1. Navigate to the app
    await page.goto('http://localhost:5173/');

    // 2. Cleanup: If there is an active session, end it.
    const stopBtn = page.getByRole('button', { name: /Stop Sleep/i });
    if (await stopBtn.isVisible({ timeout: 1000 }).catch(() => false)) {
      await stopBtn.click();
      // Wait for the session to end and button to return to "Start Sleep" or be visible again.
      await expect(page.getByRole('button', { name: /Start Sleep/i })).toBeVisible({ timeout: 5000 });
    }
  });

  test('1. page loads — Start Sleep button is visible', async ({ page }) => {
    // By default, there should be no active session (after cleanup), so "Baby is awake" should be visible.
    await expect(page.getByRole('button', { name: /Start Sleep/i })).toBeVisible();
    await expect(page.getByText(/Baby is awake/i)).toBeVisible();
  });

  test('2. click Start Sleep — button changes to Stop Sleep, status banner updates', async ({ page }) => {
    const startBtn = page.getByRole('button', { name: /Start Sleep/i });
    await startBtn.click();

    // The button will temporarily show "Processing..." (disabled).
    // We wait for it to transition to the active session state: "Stop Sleep".
    await expect(page.getByRole('button', { name: /Stop Sleep/i })).toBeVisible();
    await expect(page.getByText(/Baby is sleeping/i)).toBeVisible();
  });

  test('3. adjust start time to 5 minutes ago — verify API receives adjusted time', async ({ page }) => {
    const datetimeInput = page.locator('input[type="datetime-local"]');
    
    const now = new Date();
    const fiveMinAgo = new Date(now.getTime() - 5 * 60 * 1000);
    const adjustedTime = fiveMinAgo.toISOString().slice(0, 16);
    await datetimeInput.fill(adjustedTime);

    await page.getByRole('button', { name: /Start Sleep/i }).click();
    
    // Wait for transition to "Stop Sleep"
    await expect(page.getByRole('button', { name: /Stop Sleep/i })).toBeVisible();
    await expect(page.getByText(/Baby is sleeping/i)).toBeVisible();
  });

  test('4. click Stop Sleep — button returns to Start Sleep', async ({ page }) => {
    // 1. Start a session
    await page.getByRole('button', { name: /Start Sleep/i }).click();
    await expect(page.getByRole('button', { name: /Stop Sleep/i })).toBeVisible();

    // 2. Stop the session
    await page.getByRole('button', { name: /Stop Sleep/i }).click();
    // After clicking, it should return to "Start Sleep"
    await expect(page.getByRole('button', { name: /Start Sleep/i })).toBeVisible();
  });

  test('5. reload page — UI correctly reflects state from API', async ({ page }) => {
    // 1. Start a session
    await page.getByRole('button', { name: /Start Sleep/i }).click();
    await expect(page.getByRole('button', { name: /Stop Sleep/i })).toBeVisible();

    // 2. Reload the page
    await page.reload();
    
    // 3. Check if state is persistent from API
    await expect(page.getByRole('button', { name: /Stop Sleep/i })).toBeVisible();
    await expect(page.getByText(/Baby is sleeping/i)).toBeVisible();
  });

  test('6. Reset to now link resets the time field', async ({ page }) => {
    const datetimeInput = page.locator('input[type="datetime-local"]');

    // Fill with a dummy value to see if it resets
    const futureTime = new Date(Date.now() + 10 * 60 * 1000).toISOString().slice(0, 16);
    await datetimeInput.fill(futureTime);

    // Click Reset
    await page.getByRole('button', { name: /Reset to now/i }).click();
    
    // Value should be updated (might slightly differ due to seconds but we check visibility/existence)
    const newValue = await datetimeInput.inputValue();
    expect(newValue).not.toBe(futureTime);
  });

  test('7. elapsed time shows for active session', async ({ page }) => {
    await page.getByRole('button', { name: /Start Sleep/i }).click();
    await expect(page.getByRole('button', { name: /Stop Sleep/i })).toBeVisible();

    // Verify that elapsed time (e.g., "1m" or "just now") is visible
    await expect(page.getByText(/(\d+h|\d+m|just\s*now)/i)).toBeVisible();
  });
});