import { describe, it, expect } from 'bun:test';
import { renderTemplate } from '../src/engine/render';
import type { Template } from '../src/types/template';

describe('Template Renderer', () => {
  it('should render text block', () => {
    const template: Template = {
      id: 'test',
      name: 'Test',
      width: '80mm',
      blocks: [
        { type: 'text', content: 'Hello World', align: 'center' }
      ]
    };
    
    const data = {};
    const result = renderTemplate(template, data);
    expect(result).toBeInstanceOf(Uint8Array);
    expect(result.length).toBeGreaterThan(0);
  });

  it('should substitute mustache variables', () => {
    const template: Template = {
      id: 'test',
      name: 'Test',
      width: '80mm',
      blocks: [
        { type: 'text', content: 'Hello {{name}}' }
      ]
    };
    
    const data = { name: 'Alice' };
    const result = renderTemplate(template, data);
    const text = new TextDecoder().decode(result);
    expect(text).toContain('Hello Alice');
  });

  it('should render divider', () => {
    const template: Template = {
      id: 'test',
      name: 'Test',
      width: '80mm',
      blocks: [
        { type: 'divider', char: '=' }
      ]
    };
    
    const result = renderTemplate(template, {});
    const text = new TextDecoder().decode(result);
    expect(text).toContain('========');
  });
});