import { describe, it, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { saveFindings } from './comments.js';
import { FINDINGS_PATH } from './config.js';

describe('saveFindings', () => {
  const tempDirs = [];
  const makeTempDir = prefix => {
    const dir = fs.mkdtempSync(path.join(os.tmpdir(), prefix));
    tempDirs.push(dir);
    return dir;
  };

  it('writes findings to workspace and mirror dirs when provided', () => {
    const workspace = makeTempDir('findings-ws-');
    const mirrorDir = makeTempDir('findings-mirror-');
    const findings = [{ level: 'warning', role: 'Leo', location: 'file.js:1', suggestion: 'test' }];

    saveFindings(workspace, findings, mirrorDir);

    const workspaceText = fs.readFileSync(path.join(workspace, FINDINGS_PATH), 'utf8');
    const mirrorText = fs.readFileSync(path.join(mirrorDir, FINDINGS_PATH), 'utf8');
    assert.equal(workspaceText, JSON.stringify(findings, null, 2) + '\n');
    assert.equal(mirrorText, JSON.stringify(findings, null, 2) + '\n');
  });

  it('writes only to workspace when mirrorDir is omitted', () => {
    const workspace = makeTempDir('findings-ws-');
    const findings = [{ level: 'info', role: 'Maya', location: 'file.js:2', suggestion: 'note' }];

    saveFindings(workspace, findings);

    const workspaceText = fs.readFileSync(path.join(workspace, FINDINGS_PATH), 'utf8');
    assert.equal(workspaceText, JSON.stringify(findings, null, 2) + '\n');
  });

  it('does not duplicate writes when mirrorDir matches workspace', () => {
    const workspace = makeTempDir('findings-same-');
    const findings = [];
    const writeCalls = [];
    const originalWriteFileSync = fs.writeFileSync;

    fs.writeFileSync = (...args) => {
      writeCalls.push(args[0]);
      return originalWriteFileSync(...args);
    };

    try {
      saveFindings(workspace, findings, workspace);
    } finally {
      fs.writeFileSync = originalWriteFileSync;
    }

    assert.equal(writeCalls.length, 1);
    assert.equal(writeCalls[0], path.join(workspace, FINDINGS_PATH));
  });

  it('writes an empty JSON array when findings is empty', () => {
    const workspace = makeTempDir('findings-empty-');

    saveFindings(workspace, []);

    const workspaceText = fs.readFileSync(path.join(workspace, FINDINGS_PATH), 'utf8');
    assert.equal(workspaceText, '[]\n');
  });

  afterEach(() => {
    while (tempDirs.length > 0) {
      fs.rmSync(tempDirs.pop(), { recursive: true, force: true });
    }
  });
});