codegen.test.ts

import { describe, it, expect } from 'vitest';
import { existsSync, readFileSync } from 'node:fs';
import { resolve } from 'node:path';

const ROOT = resolve(__dirname, '..');

describe('OpenAPI Codegen', () => {
  it('generates src/generated/types.ts with auto-generated header', () => {
    const generatedPath = resolve(ROOT, 'src', 'generated', 'types.ts');
    expect(existsSync(generatedPath)).toBe(true);

    const content = readFileSync(generatedPath, 'utf-8');
    expect(content).toContain('AUTO-GENERATED FILE — DO NOT EDIT MANUALLY');
    expect(content).toContain('Generated by scripts/codegen.ts from OpenAPI spec');
    expect(content).toContain('To regenerate: npm run codegen');
  });

  it('vendored OpenAPI spec exists at openapi/lily-backend.yaml', () => {
    const specPath = resolve(ROOT, 'openapi', 'lily-backend.yaml');
    expect(existsSync(specPath)).toBe(true);

    const content = readFileSync(specPath, 'utf-8');
    expect(content).toContain('openapi: 3.0.3');
    expect(content).toContain('Lily Protocol Backend API');
  });

  it('CODEGEN.md documentation exists', () => {
    const docPath = resolve(ROOT, 'CODEGEN.md');
    expect(existsSync(docPath)).toBe(true);

    const content = readFileSync(docPath, 'utf-8');
    expect(content).toContain('npm run codegen');
    expect(content).toContain('openapi/lily-backend.yaml');
    expect(content).toContain('src/generated/types.ts');
  });

  it('generated types include expected schema components', () => {
    const generatedPath = resolve(ROOT, 'src', 'generated', 'types.ts');
    const content = readFileSync(generatedPath, 'utf-8');

    // Verify key schemas from the vendored spec are present
    expect(content).toContain('HealthStatus');
    expect(content).toContain('Agent');
    expect(content).toContain('Wallet');
    expect(content).toContain('Payment');
    expect(content).toContain('IdentityProfile');
    expect(content).toContain('VerificationResult');
  });

  it('package.json includes codegen script', () => {
    const pkgPath = resolve(ROOT, 'package.json');
    const pkg = JSON.parse(readFileSync(pkgPath, 'utf-8'));

    expect(pkg.scripts).toBeDefined();
    expect(pkg.scripts.codegen).toBe('tsx scripts/codegen.ts');
  });
});