import { describe, it, expect, vi, beforeEach } from 'vitest';
import { NextRequest } from 'next/server';

vi.mock('@/lib/db/queries', () => ({
  getMasteryMap: vi.fn(),
}));

import { GET } from '../route';
import { getMasteryMap } from '@/lib/db/queries';

const mockGet = vi.mocked(getMasteryMap);

const NOW = new Date('2026-06-21T10:00:00Z');
const LATER = new Date('2026-06-28T10:00:00Z');

const ENTRIES = [
  {
    conceptId: 'c1',
    conceptName: 'Closures',
    blueprintId: 'bp1',
    blueprintTitle: 'JavaScript',
    blueprintIntentKey: 'javascript',
    score: 0.8,
    lastSeen: NOW,
    nextReview: LATER,
  },
  {
    conceptId: 'c2',
    conceptName: 'Promises',
    blueprintId: 'bp1',
    blueprintTitle: 'JavaScript',
    blueprintIntentKey: 'javascript',
    score: 0.45,
    lastSeen: NOW,
    nextReview: NOW,
  },
];

function makeRequest(userId?: string) {
  const url = userId
    ? `http://localhost:3000/api/mastery?userId=${userId}`
    : 'http://localhost:3000/api/mastery';
  return new NextRequest(url);
}

describe('GET /api/mastery', () => {
  beforeEach(() => vi.clearAllMocks());

  it('returns 400 when userId is missing', async () => {
    const res = await GET(makeRequest());
    expect(res.status).toBe(400);
  });

  it('returns 200 with empty groups when no mastery', async () => {
    mockGet.mockResolvedValue([]);
    const res = await GET(makeRequest('u1'));
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.groups).toHaveLength(0);
  });

  it('groups entries by blueprintTitle', async () => {
    mockGet.mockResolvedValue(ENTRIES);
    const res = await GET(makeRequest('u1'));
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body.groups).toHaveLength(1);
    expect(body.groups[0].blueprintTitle).toBe('JavaScript');
    expect(body.groups[0].concepts).toHaveLength(2);
  });

  it('includes score in each concept entry', async () => {
    mockGet.mockResolvedValue(ENTRIES);
    const res = await GET(makeRequest('u1'));
    const body = await res.json();
    const concepts = body.groups[0].concepts;
    expect(concepts[0].score).toBe(0.8);
    expect(concepts[1].score).toBe(0.45);
  });
});