/**
 * E2E: full learn flow.
 *
 * Runs against the live dev server with seeded data (pnpm seed).
 * Mocks only the grade and socratic API calls (avoid real LLM cost).
 * Lesson data comes from the DB (seeded js-closures corpus).
 *
 * Pre-condition: `docker compose up -d && pnpm seed` must have run.
 */
import { test, expect } from '@playwright/test';

// ── Mock payloads ─────────────────────────────────────────────────────────────

const MOCK_GRADE_MASTERED = {
  responseId: 'resp-uuid-001',
  gradeId: 'grade-uuid-001',
  grade: {
    verdict: 'mastered',
    rubric_hits: ['r1', 'r2'],
    misconception_tag: 'none',
    evidence_span: 'retains access to variables from its enclosing scope',
    feedback_directive: 'advance',
    confidence: 0.92,
  },
};

const MOCK_GRADE_PARTIAL = {
  responseId: 'resp-uuid-002',
  gradeId: 'grade-uuid-002',
  grade: {
    verdict: 'partial',
    rubric_hits: ['r1'],
    misconception_tag: 'none',
    evidence_span: 'a function inside a function',
    feedback_directive: 'probe: Can you say more about what happens after the outer function returns?',
    confidence: 0.78,
  },
};

const MOCK_GRADE_BUDGET_EXCEEDED = {
  status: 429,
  json: { error: 'Session limit reached. Start a new session to continue.' },
};

// ── Tests ─────────────────────────────────────────────────────────────────────

test.describe('learn flow (seeded DB)', () => {
  test('homepage loads with intent input', async ({ page }) => {
    await page.goto('/');
    await expect(page.locator('h1')).toContainText('Curio');
    await expect(page.locator('[aria-label="Learning intent"]')).toBeVisible();
    await expect(page.locator('button[type="submit"]')).toBeDisabled();
  });

  test('intent submission navigates to lesson page', async ({ page }) => {
    await page.route('/api/intent', (route) =>
      route.fulfill({
        json: { intentKey: 'javascript-closures', blueprintId: 'bp-seed', isNew: false },
      }),
    );

    await page.goto('/');
    await page.fill('[aria-label="Learning intent"]', 'JavaScript closures');
    await page.click('button[type="submit"]');

    await expect(page).toHaveURL('/learn/javascript-closures');
  });

  test('lesson page renders seeded content', async ({ page }) => {
    await page.goto('/learn/javascript-closures');

    // Blueprint title
    await expect(page.locator('h1')).toContainText('JavaScript Closures');

    // First segment body is visible
    await expect(page.getByText(/closure/i).first()).toBeVisible();

    // First checkpoint prompt is visible
    await expect(page.getByText(/explain what a closure is/i)).toBeVisible();
  });

  test('mastered verdict unlocks next segment', async ({ page }) => {
    await page.route('/api/grade', (route) => route.fulfill({ json: MOCK_GRADE_MASTERED }));

    await page.goto('/learn/javascript-closures');

    const textarea = page.locator('textarea').first();
    await textarea.fill('A closure retains access to variables from its enclosing scope even after the outer function returns.');
    await page.locator('button[type="submit"]').first().click();

    await expect(page.getByText(/mastered/i)).toBeVisible();
    // Second segment should now be unlocked (no longer shows "locked" hint)
    await expect(page.getByText('Complete the previous checkpoint to continue.')).not.toBeVisible();
  });

  test('partial verdict shows probe question', async ({ page }) => {
    await page.route('/api/grade', (route) => route.fulfill({ json: MOCK_GRADE_PARTIAL }));

    await page.goto('/learn/javascript-closures');

    const textarea = page.locator('textarea').first();
    await textarea.fill('a function inside a function');
    await page.locator('button[type="submit"]').first().click();

    await expect(page.getByText(/partial/i)).toBeVisible();
    await expect(
      page.getByText(/what happens after the outer function returns/i),
    ).toBeVisible();
  });

  test('budget exceeded shows friendly error', async ({ page }) => {
    await page.route('/api/grade', (route) =>
      route.fulfill(MOCK_GRADE_BUDGET_EXCEEDED),
    );

    await page.goto('/learn/javascript-closures');

    const textarea = page.locator('textarea').first();
    await textarea.fill('some answer');
    await page.locator('button[type="submit"]').first().click();

    await expect(page.getByText(/session limit/i)).toBeVisible();
  });
});