/**
 * 平台抽象层 - Electron 实现
 * 仅在存在 require 且可加载 electron 时使用；封装 IPC、dialog、fs、remote。
 */
(function () {
  'use strict';

  if (typeof require === 'undefined') {
    return;
  }

  var ipcRenderer, dialog, path, fs, remote, clipboard;
  try {
    ipcRenderer = require('electron').ipcRenderer;
    dialog = require('@electron/remote').dialog;
    path = require('path');
    fs = require('fs');
    remote = require('@electron/remote');
    clipboard = require('electron').clipboard;
  } catch (e) {
    console.warn('[platform] Electron modules not available', e);
    return;
  }

  var exePath = remote.app.getPath('userData');
  var historyFilePath = path.join(exePath, 'data.json');

  var bridge = {
    readHistory: function () {
      return ipcRenderer.invoke('history:read');
    },
    writeHistory: function (data) {
      return ipcRenderer.invoke('history:write', data);
    },
    readJsonFile: function (filePath) {
      if (!filePath) return Promise.resolve(null);
      return ipcRenderer.invoke('file:read-json', filePath);
    },
    showOpenDialog: function (options) {
      return dialog.showOpenDialog(options).then(function (result) {
        return { canceled: result.canceled, filePaths: result.filePaths };
      });
    },
    showSaveDialog: function (options) {
      return dialog.showSaveDialog(options);
    },
    writeFile: function (filePath, content) {
      return new Promise(function (resolve, reject) {
        var buf = Buffer.isBuffer(content) ? content : (typeof content === 'string' ? Buffer.from(content, 'utf8') : Buffer.from(content));
        fs.writeFile(filePath, buf, 'utf8', function (err) {
          if (err) reject(err);
          else resolve();
        });
      });
    },
    writeFileSync: function (filePath, content) {
      fs.writeFileSync(filePath, content, 'utf8');
    },
    readFile: function (filePath) {
      return new Promise(function (resolve, reject) {
        fs.readFile(filePath, function (err, data) {
          if (err) reject(err);
          else resolve(data);
        });
      });
    },
    readFileSync: function (filePath) {
      return fs.readFileSync(filePath);
    },
    existsSync: function (p) {
      return fs.existsSync(p);
    },
    getAppVersion: function () {
      return ipcRenderer.invoke('app:get-version');
    },
    getLocale: function () {
      return remote.app.getLocale();
    },
    getUserDataPath: function () {
      return exePath;
    },
    getSystemFonts: function () {
      return new Promise(function (resolve, reject) {
        ipcRenderer.once('font-list', function (ev, fonts) {
          resolve(fonts || []);
        });
        ipcRenderer.send('get-sys-fonts');
        setTimeout(function () {
          resolve([]);
        }, 10000);
      });
    },
    openDesignPage: function (file, type) {
      ipcRenderer.send('open-design-page', file || 'empty', type || '1');
    },
    openFirstPage: function () {
      ipcRenderer.send('open-first-page');
    },
    onClose: function (callback) {
      ipcRenderer.on('close', callback);
    },
    runClose: function () {
      ipcRenderer.send('run-close');
    },
    openHelp: function () {
      ipcRenderer.send('open-help-file');
    },
    printPdf: function (urlOrBlob) {
      ipcRenderer.send('print-pdf', urlOrBlob);
    },
    getScaleRate: function () {
      return typeof window !== 'undefined' && window.devicePixelRatio ? window.devicePixelRatio : 1;
    },
    clipboard: {
      readText: function () {
        return Promise.resolve(clipboard.readText());
      },
      writeText: function (text) {
        clipboard.writeText(text);
        return Promise.resolve();
      }
    }
  };

  window.platformBridge = bridge;

  // 兼容现有命名
  window.sysAPI = {
    readHistory: bridge.readHistory,
    writeHistory: bridge.writeHistory,
    readJsonFile: bridge.readJsonFile,
    getAppVersion: bridge.getAppVersion
  };
  window.dialog = {
    showOpenDialog: bridge.showOpenDialog,
    showSaveDialog: bridge.showSaveDialog
  };
  window.path = path;
  window.fs = fs;
  window.remote = remote;
  window.ipcRenderer = ipcRenderer;
  window.clipboard = clipboard;
  window.exePath = exePath;
  window.fullPath = historyFilePath;
})();