/**
 * 平台抽象层 - 统一接口定义
 * 桌面端由 lib/platform/electron.js 实现，网页端由 lib/platform/web.js 实现。
 * 业务代码通过 window.platformBridge 或兼容的 window.sysAPI / window.dialog 调用。
 */
(function () {
  'use strict';

  // 若已存在（由 electron 或 web 注入），则不覆盖
  if (typeof window.platformBridge !== 'undefined') {
    return;
  }

  // 默认空实现，避免未注入时报错（仅作占位，实际运行前必须注入 electron 或 web 实现）
  function notImplemented() {
    console.warn('[platform] bridge not injected');
    return Promise.reject(new Error('Platform bridge not available'));
  }

  window.platformBridge = {
    readHistory: notImplemented,
    writeHistory: notImplemented,
    readJsonFile: notImplemented,
    showOpenDialog: notImplemented,
    showSaveDialog: notImplemented,
    writeFile: notImplemented,
    readFile: notImplemented,
    getAppVersion: function () { return Promise.resolve('0.0.0'); },
    getLocale: function () { return 'zh'; },
    getUserDataPath: function () { return ''; },
    getSystemFonts: function () { return Promise.resolve([]); },
    openDesignPage: function () {},
    openFirstPage: function () {},
    onClose: function () {},
    runClose: function () {},
    openHelp: function () {},
    printPdf: notImplemented,
    getScaleRate: function () { return typeof window !== 'undefined' ? (window.devicePixelRatio || 1) : 1; },
    clipboard: {
      readText: function () { return Promise.resolve(''); },
      writeText: function () { return Promise.resolve(); }
    }
  };
})();