import { describe, it, expect, vi, beforeEach } from 'vitest';

describe('preload.js - fakeIpcRenderer', () => {
  let fakeIpcRenderer, fakeElectronModule, fakePathModule;

  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe('fakeIpcRenderer', () => {
    it('defines invoke method', () => {
      const fakeIpcRenderer = {
        invoke: (channel, ...args) => 'invoke',
        on: (channel, callback) => 'on',
      };
      expect(typeof fakeIpcRenderer.invoke).toBe('function');
      expect(typeof fakeIpcRenderer.on).toBe('function');
    });
  });

  describe('fakeElectronModule', () => {
    it('has expected structure', () => {
      const fakeElectronModule = {
        ipcRenderer: {},
        app: null,
        BrowserWindow: null,
        dialog: null,
        ipcMain: null,
      };
      expect(fakeElectronModule.app).toBeNull();
      expect(fakeElectronModule.BrowserWindow).toBeNull();
      expect(fakeElectronModule.dialog).toBeNull();
      expect(fakeElectronModule.ipcMain).toBeNull();
    });
  });

  describe('fakePathModule', () => {
    const path = require('path');

    it('joins paths', () => {
      const fakePathModule = {
        join: (...args) => path.join(...args),
        dirname: (p) => path.dirname(p),
        basename: (p) => path.basename(p),
        extname: (p) => path.extname(p),
        sep: path.sep,
        resolve: (...args) => path.resolve(...args),
      };
      expect(fakePathModule.join('a', 'b', 'c')).toBe(path.join('a', 'b', 'c'));
      expect(fakePathModule.dirname('/path/to/file.txt')).toBe('/path/to');
      expect(fakePathModule.basename('/path/to/file.txt')).toBe('file.txt');
      expect(fakePathModule.extname('/path/to/file.txt')).toBe('.txt');
    });
  });

  describe('requirePolyfill', () => {
    let requirePolyfill;

    beforeEach(() => {
      const path = require('path');
      requirePolyfill = (moduleName) => {
        if (moduleName === 'electron') {
          return { ipcRenderer: {}, app: null, BrowserWindow: null, dialog: null, ipcMain: null };
        }
        if (moduleName === 'path') {
          return {
            join: (...args) => path.join(...args),
            dirname: (p) => path.dirname(p),
            basename: (p) => path.basename(p),
            extname: (p) => path.extname(p),
            sep: path.sep,
            resolve: (...args) => path.resolve(...args),
          };
        }
        if (moduleName === 'fs') {
          throw new Error('Direct fs access disabled. Use IPC.');
        }
        if (moduleName.startsWith('./')) {
          const baseName = moduleName.replace('./', '').replace('.js', '');
          const mod = global[baseName];
          if (mod) return mod;
          throw new Error(`Module not found: ${moduleName}`);
        }
        throw new Error(`Module not allowed: ${moduleName}`);
      };
    });

    it('returns electron module for electron', () => {
      const result = requirePolyfill('electron');
      expect(result).toBeDefined();
      expect(result.app).toBeNull();
    });

    it('returns path module for path', () => {
      const result = requirePolyfill('path');
      expect(typeof result.join).toBe('function');
      expect(typeof result.dirname).toBe('function');
      expect(typeof result.basename).toBe('function');
      expect(typeof result.extname).toBe('function');
      expect(typeof result.sep).toBe('string');
      expect(typeof result.resolve).toBe('function');
    });

    it('throws for fs module', () => {
      expect(() => requirePolyfill('fs')).toThrow('Direct fs access disabled. Use IPC.');
    });

    it('throws for unallowed modules', () => {
      expect(() => requirePolyfill('http')).toThrow('Module not allowed: http');
    });

    it('throws for unknown relative modules', () => {
      expect(() => requirePolyfill('./unknown')).toThrow('Module not found:');
    });

    it('handles relative module with .js extension', () => {
      global.UIManager = { test: true };
      const result = requirePolyfill('./UIManager.js');
      expect(result.test).toBe(true);
      delete global.UIManager;
    });

    it('handles relative module without .js extension', () => {
      global.FileManager = { test: true };
      const result = requirePolyfill('./FileManager');
      expect(result.test).toBe(true);
      delete global.FileManager;
    });
  });
});