import { describe, expect, it } from 'vitest';
import { readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { ScreenReader } from '../src/core/screen-reader.js';
import { classifyDialog, parseOptions, type ClassifiedDialog } from '../src/core/dialog-classifier.js';

const capturesDir = join(dirname(fileURLToPath(import.meta.url)), '..', '..', '..', 'spikes', 's3-tui', 'captures');

/** Rejoue un flux PTY brut par segments (comme l'adapter en prod) et collecte écran+dialogue détecté. */
async function replay(fixture: string): Promise<Array<{ dialog: ClassifiedDialog; text: string }>> {
  const data = readFileSync(join(capturesDir, fixture));
  const reader = new ScreenReader(120, 40);
  const seen: Array<{ dialog: ClassifiedDialog; text: string }> = [];
  const STEP = 512;
  for (let i = 0; i < data.length; i += STEP) {
    await reader.feed(data.subarray(i, i + STEP)); // xterm gère les séquences coupées en frontière
    const lines = reader.snapshotLines();
    const d = classifyDialog(lines);
    if (d) seen.push({ dialog: d, text: lines.join('\n') });
  }
  reader.dispose();
  return seen;
}

describe('ScreenReader (@xterm/headless) — anti strip-ANSI naïf', () => {
  it('préserve les espaces du dialogue (« Do you want to create », pas « Doyouwant »)', async () => {
    const seen = await replay('perm-write2.raw.log');
    expect(seen.length).toBeGreaterThan(0);
    expect(seen.some((s) => /Do you want to create/.test(s.text))).toBe(true);
  });
});

describe('classifyDialog — unitaire (lignes synthétiques)', () => {
  it('trust', () => {
    const d = classifyDialog(['Do you trust the files in this folder?', '❯ 1. Yes, I trust this folder', '2. No, exit']);
    expect(d?.kind).toBe('trust');
    expect(d?.options).toHaveLength(2);
    expect(d?.options[0]).toMatchObject({ n: 1, selected: true });
  });
  it('permission', () => {
    const d = classifyDialog(['Do you want to create s3-edit.txt?', '❯ 1. Yes', '3. No', 'Esc to cancel · Tab to amend']);
    expect(d?.kind).toBe('permission');
  });
  it('question (prime sur permission malgré « Esc to cancel »)', () => {
    const d = classifyDialog(['☐ Couleur', '❯ 1. Rouge', '2. Bleu', 'Enter to select · ↑/↓ to navigate · Esc to cancel']);
    expect(d?.kind).toBe('question');
  });
  it('aucun dialogue → null', () => {
    expect(classifyDialog(['just some output', 'no options here'])).toBeNull();
  });
  it('parseOptions tolère « ❯ 2) Label » et trim', () => {
    expect(parseOptions(['  ❯ 2)   Yes, allow all  '])).toEqual([{ n: 2, label: 'Yes, allow all', selected: true }]);
  });
});

describe('détection sur fixtures réelles S3 (replay headless)', () => {
  it('perm-write2 → permission avec options Yes/…/No, option 1 sélectionnée', async () => {
    const perms = (await replay('perm-write2.raw.log')).filter((s) => s.dialog.kind === 'permission');
    expect(perms.length).toBeGreaterThan(0);
    const withOpts = perms.find((s) => s.dialog.options.length >= 2);
    expect(withOpts).toBeDefined();
    const labels = withOpts!.dialog.options.map((o) => o.label).join(' | ');
    expect(labels).toMatch(/Yes/);
    expect(labels).toMatch(/No/);
    expect(withOpts!.dialog.options.find((o) => o.n === 1)?.selected).toBe(true);
  });

  it('ask2 → question avec une option « Rouge »', async () => {
    const qs = (await replay('ask2.raw.log')).filter((s) => s.dialog.kind === 'question');
    expect(qs.length).toBeGreaterThan(0);
    expect(qs.some((s) => s.dialog.options.some((o) => /Rouge/.test(o.label)))).toBe(true);
  });

  it('trust → dialogue trust détecté', async () => {
    const seen = await replay('trust.raw.log');
    expect(seen.some((s) => s.dialog.kind === 'trust')).toBe(true);
  });
});