import { describe, it, beforeEach, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import fs from 'fs';
import os from 'os';
import path from 'path';
import { validateJSONArrayFile, ensureJSONArrayFileExists } from './json.js';

describe('json helpers', () => {
  let workspace;

  beforeEach(() => {
    workspace = fs.mkdtempSync(path.join(os.tmpdir(), 'json-test-'));
  });

  afterEach(() => {
    fs.rmSync(workspace, { recursive: true, force: true });
  });

  it('reports missing file without creating it', async () => {
    const fullPath = path.join(workspace, '.gitea/ai-review/findings.json');

    const result = await validateJSONArrayFile(fullPath, '.gitea/ai-review/findings.json');

    assert.deepEqual(result, { exists: false, valid: false, repaired: false });
    assert.equal(fs.existsSync(fullPath), false);
  });

  it('creates an empty array file when asked to ensure existence', () => {
    const fullPath = path.join(workspace, '.gitea/ai-review/findings.json');

    const created = ensureJSONArrayFileExists(fullPath, '.gitea/ai-review/findings.json');

    assert.equal(created, true);
    assert.equal(fs.readFileSync(fullPath, 'utf8'), '[]\n');
  });

  it('keeps a valid JSON array unchanged', async () => {
    const fullPath = path.join(workspace, '.gitea/ai-review/exclusions.json');
    fs.mkdirSync(path.dirname(fullPath), { recursive: true });
    fs.writeFileSync(fullPath, '[]\n', 'utf8');

    const result = await validateJSONArrayFile(fullPath, '.gitea/ai-review/exclusions.json');

    assert.deepEqual(result, { exists: true, valid: true, repaired: false });
    assert.equal(fs.readFileSync(fullPath, 'utf8'), '[]\n');
  });

  it('repairs invalid JSON using AI output and rewrites the file', async () => {
    const fullPath = path.join(workspace, '.gitea/ai-review/findings.json');
    fs.mkdirSync(path.dirname(fullPath), { recursive: true });
    fs.writeFileSync(fullPath, '{broken', 'utf8');

    const result = await validateJSONArrayFile(fullPath, '.gitea/ai-review/findings.json', async (_fullPath, _label, original) => {
      assert.equal(original, '{broken');
      return '[{"fixed":true}]';
    });

    assert.deepEqual(result, { exists: true, valid: true, repaired: true });
    assert.equal(fs.readFileSync(fullPath, 'utf8'), '[{"fixed":true}]\n');
  });
});