import { execSync } from 'child_process';
import fs from 'fs/promises';
import { lintAgent, LintAgentResult } from '../src/services/qualimetrie/lintAgent';

jest.mock('child_process', () => ({
  execSync: jest.fn(),
}));
jest.mock('fs/promises');

describe('lintAgent', () => {
  const dummyResults = [
    { filePath: 'file1.ts', messages: [ { severity: 2 }, { severity: 1 }, { severity: 2 } ] },
    { filePath: 'file2.ts', messages: [ { severity: 1 } ] },
  ];
  beforeEach(() => {
    (execSync as jest.Mock).mockClear();
    (fs.writeFile as jest.Mock).mockClear();
  });

  it('should parse ESLint output and count errors and warnings', async () => {
    (execSync as jest.Mock).mockReturnValue(JSON.stringify(dummyResults));
    const res: LintAgentResult = await lintAgent();
    expect(res.passed).toBe(false);
    expect(res.metrics).toMatchObject({ errors: 2 + 0, warnings: 1 + 1 });
    expect(res.metrics?.files).toBe(2);
    expect(res.metrics?.total).toBe(4);
    expect(res.metrics?.fixable).toBe(0);
    expect(fs.writeFile).toHaveBeenCalledWith('eslint-report.json', expect.any(String), 'utf-8');
  });

  it('should handle execSync throwing and still return metrics', async () => {
    const error: any = new Error('fail');
    error.stdout = JSON.stringify(dummyResults);
    (execSync as jest.Mock).mockImplementation(() => { throw error; });
    const res: LintAgentResult = await lintAgent();
    expect(res.passed).toBe(false);
    expect(res.metrics).toMatchObject({ errors: 2, warnings: 2 });
    expect(res.metrics?.files).toBe(2);
    expect(res.metrics?.total).toBe(4);
    expect(res.metrics?.fixable).toBe(0);
    expect(res.output).toBe(JSON.stringify(dummyResults));
  });
});