/**
 * Tests for split-exec (deterministic git operations and PR creation)
 */

import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import { mkdtempSync, mkdirSync, rmSync } from 'fs';
import { tmpdir } from 'os';
import { join } from 'path';
import { execFileSync } from 'child_process';
import type { SimpleGit } from 'simple-git';
import simpleGit from 'simple-git';
import type { GitHubAPI } from '../../tools/prr/github/api.js';

const tempDirs: string[] = [];

afterEach(() => {
  for (const dir of tempDirs.splice(0)) {
    rmSync(dir, { recursive: true, force: true });
  }
});

function initGitRepo(dir: string): SimpleGit {
  execFileSync('git', ['init'], { cwd: dir, stdio: 'ignore' });
  execFileSync('git', ['config', 'user.name', 'Test'], { cwd: dir, stdio: 'ignore' });
  execFileSync('git', ['config', 'user.email', 'test@example.com'], { cwd: dir, stdio: 'ignore' });
  return simpleGit(dir);
}

describe('split-exec git operations', () => {
  it('correctly handles cherry-pick operations', async () => {
    const dir = mkdtempSync(join(tmpdir(), 'split-exec-'));
    tempDirs.push(dir);

    const git = initGitRepo(dir);

    // Create base branch
    require('fs').writeFileSync(join(dir, 'README.md'), '# Test\n', 'utf-8');
    await git.add('.');
    await git.commit('Initial commit');
    await git.checkoutBranch('main', 'HEAD');

    // Create feature branch with commits
    await git.checkoutBranch('feature', 'main');
    mkdirSync(join(dir, 'src'), { recursive: true });
    require('fs').writeFileSync(join(dir, 'src/a.ts'), 'export const a = 1;\n', 'utf-8');
    await git.add('.');
    const commitSha = await git.commit('Add a.ts');

    // Create target branch
    await git.checkoutBranch('feature-a', 'main');

    // TODO: Test cherry-pick operation
    // This would test that split-exec correctly cherry-picks commits
    expect(true).toBe(true);
  });

  it('handles conflicts correctly', async () => {
    const dir = mkdtempSync(join(tmpdir(), 'split-exec-'));
    tempDirs.push(dir);

    const git = initGitRepo(dir);

    // TODO: Test conflict resolution
    // Create a scenario with merge conflicts and verify handling
    expect(true).toBe(true);
  });

  it('creates PRs with correct metadata', async () => {
    const mockGithub: Partial<GitHubAPI> = {
      createPR: vi.fn(async () => ({ number: 1, url: 'https://github.com/test/test/pull/1' })),
    };

    // TODO: Test PR creation
    // Verify that split-exec creates PRs with correct title, body, base branch
    expect(true).toBe(true);
  });
});