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

/**
 * Fully deterministic end-to-end test. The Playwright webServer boots the real
 * stack (Vite :5173 → Express :4321) with LLM_STUB=1, so the backend uses the
 * deterministic turn simulator in server/stub.ts: the player nation's `military`
 * stat is set to (current + 5, clamped) each turn and exactly one event is
 * emitted (action → military, chat → diplomatic, jump → political). There is no
 * live LLM and no flakiness — every assertion below is an exact, predicted value.
 *
 * Beyond the core simulation loop it also asserts the polished command-center
 * UI: the dossier's animated stat bars, the map legend (generated from the
 * region map), and the new event cards (type icon + label + colored outcome
 * badge). The map itself is a canvas, so we assert on its DOM legend, not pixels.
 */
test.describe('History — deterministic simulation (LLM_STUB=1)', () => {
  test('scenario → nation → action → jump, with predicted stat changes', async ({ page }) => {
    await page.goto('/');

    // Home: the scenario grid loads with all 5 presets.
    const presetCards = page.getByTestId('preset-card');
    await expect(presetCards.first()).toBeVisible();
    await expect(presetCards).toHaveCount(5);

    // Start the first scenario (World War II, 1939).
    await presetCards.first().getByRole('button', { name: 'Play' }).click();

    // Nation select: the world brief is shown, then we lead the United Kingdom.
    await expect(page.getByTestId('world-background')).toBeVisible();
    await page
      .getByTestId('nation-card-uk')
      .getByRole('button', { name: 'Play as United Kingdom' })
      .click();

    // Game screen mounts: map, command deck, and event feed all present; turn 1.
    await expect(page.getByTestId('world-map')).toBeVisible();
    await expect(page.getByTestId('action-panel')).toBeVisible();
    await expect(page.getByTestId('event-feed-panel')).toBeVisible();
    await expect(page.getByTestId('turn-count')).toHaveText('1');

    // The dossier shows the player's four stat bars (value-colored, animated).
    await expect(page.getByTestId('stat-military')).toBeVisible();
    await expect(page.getByTestId('stat-economy')).toBeVisible();
    await expect(page.getByTestId('stat-stability')).toBeVisible();
    await expect(page.getByTestId('stat-population')).toBeVisible();

    // The player (UK) starts at military 80, with no events yet.
    const military = page.getByTestId('stat-military');
    await expect(military).toHaveText('80');
    await expect(page.getByTestId('event-item')).toHaveCount(0);

    // The map legend is auto-generated from the region map: all 7 nations of the
    // scenario own at least one region, including the player (United Kingdom).
    await expect(page.getByTestId('map-legend-item')).toHaveCount(7, { timeout: 15000 });
    await expect(page.getByTestId('map-legend-item').filter({ hasText: 'United Kingdom' })).toBeVisible();

    // Take an action: the stub bumps UK military to 85 and emits a military event.
    await page.getByTestId('action-textarea').fill('Mobilize the home guard and fortify Dover');
    await page.getByTestId('action-submit').click();

    await expect(page.getByTestId('turn-count')).toHaveText('2', { timeout: 20000 });
    await expect(military).toHaveText('85', { timeout: 20000 });
    await expect(page.getByTestId('event-item')).toHaveCount(1);
    await expect(
      page.getByTestId('event-feed').getByText('Mobilize the home guard and fortify Dover').first(),
    ).toBeVisible();

    // The new event card carries its type (icon + label) and a colored outcome badge.
    await expect(page.getByTestId('event-item').first().getByTestId('event-type-icon')).toBeVisible();
    await expect(page.getByTestId('event-item').first().getByTestId('event-type')).toHaveText('military');
    await expect(page.getByTestId('event-item').first().getByTestId('event-outcome')).toHaveText('success');

    // Jump forward (no action): a "world moves on" political event, military → 90.
    await page.getByTestId('jump-forward').click();

    await expect(page.getByTestId('turn-count')).toHaveText('3', { timeout: 20000 });
    await expect(military).toHaveText('90', { timeout: 20000 });
    await expect(page.getByTestId('event-item')).toHaveCount(2);
    await expect(page.getByTestId('event-feed').getByText('The world moves on').first()).toBeVisible();

    // Newest first: the jump event (political / neutral) sits on top, and the
    // action event (military / success) is second — both with their outcome badges.
    await expect(page.getByTestId('event-item').first().getByTestId('event-type')).toHaveText('political');
    await expect(page.getByTestId('event-item').first().getByTestId('event-outcome')).toHaveText('neutral');
    await expect(page.getByTestId('event-item').nth(1).getByTestId('event-outcome')).toHaveText('success');
  });
});

/**
 * Save / resume across a page refresh. The active game's id is persisted in
 * localStorage, so a reload (or the home screen's "Resume last game" button)
 * must drop the user straight back into the same game — same turn, same stats,
 * same map — rather than resetting to the home screen. Deterministic under the
 * stub (UK military starts at 80 and +5 per turn).
 */
test.describe('History — save / resume across a page refresh', () => {
  async function createUkGameAtTurn2(page: Page): Promise<void> {
    await page.goto('/');
    await page.getByTestId('preset-card').first().waitFor({ timeout: 15000 });
    await page.getByTestId('preset-card').first().getByRole('button', { name: 'Play' }).click();
    await page
      .getByTestId('nation-card-uk')
      .getByRole('button', { name: 'Play as United Kingdom' })
      .click();

    // Game screen mounts at turn 1 (UK military starts at 80).
    await expect(page.getByTestId('world-map')).toBeVisible();
    await expect(page.getByTestId('turn-count')).toHaveText('1');
    await expect(page.getByTestId('stat-military')).toHaveText('80');

    // One action: the stub bumps UK military to 85 and advances to turn 2.
    await page.getByTestId('action-textarea').fill('Reinforce the Atlantic convoys');
    await page.getByTestId('action-submit').click();
    await expect(page.getByTestId('turn-count')).toHaveText('2', { timeout: 20000 });
    await expect(page.getByTestId('stat-military')).toHaveText('85', { timeout: 20000 });
  }

  test('auto-resumes into the same game after a page reload', async ({ page }) => {
    await createUkGameAtTurn2(page);

    // Reload: the persisted active game id must restore the game — not home.
    await page.reload();

    await expect(page.getByTestId('world-map')).toBeVisible();
    await expect(page.getByTestId('turn-count')).toHaveText('2', { timeout: 20000 });
    await expect(page.getByTestId('stat-military')).toHaveText('85', { timeout: 20000 });
    // The player's identity is restored in the header…
    await expect(page.getByTestId('player-nation')).toHaveText('United Kingdom');
    // …and the map legend is regenerated from the persisted region map.
    await expect(page.getByTestId('map-legend-item').first()).toBeVisible({ timeout: 15000 });
  });

  test('explicitly resumes a saved game from the home screen', async ({ page }) => {
    await createUkGameAtTurn2(page);

    // Back to the home screen: the "Resume last game" affordance is present.
    await page.getByTestId('back-to-scenarios').click();
    await expect(page.getByTestId('resume-last')).toBeVisible();

    // Resuming drops back into the same game, at the saved turn.
    await page.getByTestId('resume-last').click();
    await expect(page.getByTestId('world-map')).toBeVisible();
    await expect(page.getByTestId('turn-count')).toHaveText('2', { timeout: 20000 });
    await expect(page.getByTestId('stat-military')).toHaveText('85', { timeout: 20000 });
    await expect(page.getByTestId('player-nation')).toHaveText('United Kingdom');
  });
});