import { describe, it, expect, beforeAll } from 'vitest';
import type { Guide, Step, Screenshot } from '../src/shared/types';

class MockFileReader {
  result: string | ArrayBuffer | null = null;
  onload: ((ev: ProgressEvent) => void) | null = null;
  onerror: ((ev: ProgressEvent) => void) | null = null;

  readAsDataURL(_blob: Blob) {
    setTimeout(() => {
      this.result = `data:image/jpeg;base64,dGVzdA==`;
      if (this.onload) this.onload({} as ProgressEvent);
    }, 0);
  }
}

beforeAll(() => {
  // @ts-expect-error replace FileReader for test environment
  globalThis.FileReader = MockFileReader;
});

let exportGuideAsMarkdown: typeof import('../src/export/markdown-export').exportGuideAsMarkdown;

beforeAll(async () => {
  const mod = await import('../src/export/markdown-export');
  exportGuideAsMarkdown = mod.exportGuideAsMarkdown;
});

const guide: Guide = {
  id: 'g1',
  title: 'My Workflow Guide',
  createdAt: 1700000000000,
  updatedAt: 1700000000000,
  stepIds: ['s1', 's2'],
};

const steps: Step[] = [
  { id: 's1', guideId: 'g1', index: 0, description: 'Open the dashboard', action: 'click', url: 'https://example.com', timestamp: 1700000001000, screenshotId: 'sc1' },
  { id: 's2', guideId: 'g1', index: 1, description: 'Click settings', action: 'click', url: 'https://example.com', timestamp: 1700000002000 },
];

const screenshots: Map<string, Screenshot> = new Map([
  ['s1', { id: 'sc1', stepId: 's1', blob: new Blob(['img'], { type: 'image/jpeg' }), mimeType: 'image/jpeg', width: 800, height: 600 }],
]);

describe('exportGuideAsMarkdown', () => {
  it('returns a string starting with # {guide.title}', async () => {
    const md = await exportGuideAsMarkdown(guide, steps, screenshots);
    expect(md.trimStart()).toMatch(/^# My Workflow Guide/);
  });

  it('contains ## Step N: {description} format for each step', async () => {
    const md = await exportGuideAsMarkdown(guide, steps, screenshots);
    expect(md).toContain('## Step 1: Open the dashboard');
    expect(md).toContain('## Step 2: Click settings');
  });

  it('embeds screenshot as ![Step N](data:image/jpeg;base64,...) for steps with screenshots', async () => {
    const md = await exportGuideAsMarkdown(guide, steps, screenshots);
    expect(md).toContain('![Step 1](data:image/jpeg;base64,');
  });

  it('steps without screenshots omit image line', async () => {
    const md = await exportGuideAsMarkdown(guide, steps, screenshots);
    expect(md).not.toContain('![Step 2]');
  });

  it('ends with *Generated by Mimik*', async () => {
    const md = await exportGuideAsMarkdown(guide, steps, screenshots);
    expect(md.trimEnd()).toMatch(/\*Generated by Mimik\*$/);
  });
});