/**
 * 平台抽象层 - 网页实现
 * 使用 LocalStorage、File Picker、Blob 下载、navigator 等 Web API。
 */
(function () {
  'use strict';

  var HISTORY_KEY = 'soondesign_history';
  var VERSION = typeof __APP_VERSION__ !== 'undefined' ? __APP_VERSION__ : '3.2.101';

  /** 站点目录前缀（支持部署在子目录 / 宝塔子路径）：去掉入口 HTML 文件名 */
  function getAppBasePathname() {
    var p = (typeof window !== 'undefined' && window.location && window.location.pathname) ? window.location.pathname : '/';
    // Nginx/宝塔可能把页面写成 /design2.web.html/ ，末尾斜杠会导致匹配不到 .html，误判站点根为「目录 URL」→ 回首页 404
    while (p.length > 1 && p.endsWith('/')) {
      p = p.slice(0, -1);
    }
    if (/\.web\.html$/i.test(p) || /\.html$/i.test(p)) {
      p = p.replace(/[^/]+$/, '');
    }
    if (!p.endsWith('/')) p += '/';
    return p;
  }

  // API 相对站点根目录（与 api/README 中「相对网站根目录的 /api/」一致）
  var SERVER_API_BASE = (typeof window !== 'undefined' && window.location)
    ? (window.location.origin + getAppBasePathname() + 'api/')
    : '/api/';

  function navigateToPage(pathWithQuery) {
    try {
      location.href = new URL(pathWithQuery, window.location.href).href;
    } catch (e) {
      location.href = pathWithQuery;
    }
  }

  function getLocale() {
    var lang = typeof navigator !== 'undefined' ? (navigator.language || navigator.browserLanguage || '') : '';
    if (lang.indexOf('zh') === 0) return lang.indexOf('TW') >= 0 ? 'ozh' : 'zh';
    return 'en';
  }

  function getSystemFonts() {
    var list = [
      'Arial', 'Arial Black', 'Comic Sans MS', 'Courier New', 'Georgia',
      'Impact', 'Microsoft YaHei', 'SimHei', 'SimSun', 'KaiTi', 'FangSong',
      'Times New Roman', 'Trebuchet MS', 'Verdana', 'PingFang SC', 'Hiragino Sans GB'
    ];
    if (typeof document !== 'undefined' && document.fonts && document.fonts.forEach) {
      var set = {};
      document.fonts.forEach(function (f) {
        var name = (f.family || '').replace(/^["']|["']$/g, '');
        if (name) set[name] = 1;
      });
      list = Object.keys(set).length ? Object.keys(set).sort() : list;
    }
    return Promise.resolve(list);
  }

  var bridge = {
    readHistory: function () {
      try {
        var raw = localStorage.getItem(HISTORY_KEY);
        return Promise.resolve(raw ? JSON.parse(raw) : { history: [] });
      } catch (e) {
        return Promise.resolve({ history: [] });
      }
    },
    writeHistory: function (data) {
      try {
        localStorage.setItem(HISTORY_KEY, JSON.stringify(data));
        return Promise.resolve({ success: true });
      } catch (e) {
        return Promise.resolve({ success: false, error: e.message });
      }
    },
    readJsonFile: function (pathOrHandle) {
      if (!pathOrHandle) return Promise.resolve(null);
      if (typeof pathOrHandle === 'object' && pathOrHandle.text) {
        return pathOrHandle.text().then(function (t) {
          try { return JSON.parse(t); } catch (e) { return null; }
        });
      }
      var key = typeof pathOrHandle === 'string' ? pathOrHandle : '';
      if (key.indexOf('soondesign_session:') === 0) {
        try {
          var j = sessionStorage.getItem(key);
          if (!j && typeof localStorage !== 'undefined') j = localStorage.getItem(key);
          return Promise.resolve(j ? JSON.parse(j) : null);
        } catch (e) { return Promise.resolve(null); }
      }
      // 服务器文件：从服务器读取
      if (key && key.indexOf('.soon') > 0 && typeof fetch !== 'undefined') {
        var isServerEnv = typeof window !== 'undefined' && window.location && 
          (window.location.hostname !== 'localhost' && window.location.hostname !== '127.0.0.1' && window.location.protocol !== 'file:');
        if (isServerEnv) {
          return fetch(SERVER_API_BASE + 'read_file.php?fileName=' + encodeURIComponent(key))
            .then(function(response) {
              if (!response.ok) return null;
              return response.json();
            })
            .catch(function() { return null; });
        }
      }
      return Promise.resolve(null);
    },
    showOpenDialog: function (options) {
      return new Promise(function (resolve) {
        var input = document.createElement('input');
        input.type = 'file';
        // 根据 options.filters 动态设置 accept
        if (options && options.filters && Array.isArray(options.filters) && options.filters.length > 0) {
          var acceptList = [];
          options.filters.forEach(function(filter) {
            if (filter.extensions && Array.isArray(filter.extensions)) {
              filter.extensions.forEach(function(ext) {
                // 移除点号（如果有），然后添加点号前缀
                var cleanExt = ext.replace(/^\./, '');
                // 图片类型使用 image/* MIME 类型，其他使用扩展名
                if (['png', 'jpg', 'jpeg', 'gif', 'bmp', 'webp', 'svg'].indexOf(cleanExt.toLowerCase()) >= 0) {
                  var mimeType = 'image/' + (cleanExt.toLowerCase() === 'jpg' ? 'jpeg' : cleanExt.toLowerCase());
                  if (acceptList.indexOf(mimeType) < 0) acceptList.push(mimeType);
                } else {
                  var extWithDot = '.' + cleanExt;
                  if (acceptList.indexOf(extWithDot) < 0) acceptList.push(extWithDot);
                }
              });
            }
          });
          input.accept = acceptList.length > 0 ? acceptList.join(',') : '';
        } else {
          // 默认：.soon 文件
          input.accept = '.soon,application/json';
        }
        input.style.display = 'none';
        input.onchange = function () {
          var f = input.files && input.files[0];
          document.body.removeChild(input);
          if (!f) resolve({ canceled: true });
          else resolve({ canceled: false, filePaths: [], files: [f], file: f });
        };
        document.body.appendChild(input);
        input.click();
      });
    },
    showSaveDialog: function (options) {
      var raw = (options && options.defaultPath) ? options.defaultPath : '';
      var defaultName = raw
        ? (raw.indexOf('soondesign_session:') === 0 ? raw.substring('soondesign_session:'.length) : raw.split(/[/\\]/).pop())
        : 'design.soon';
      return new Promise(function (resolve) {
        if (typeof window.showSaveFilePicker !== 'function') {
          var name = typeof prompt === 'function' ? prompt('保存为文件名（如 xxx.soon）', defaultName) : defaultName;
          if (name === null) {
            resolve({ canceled: true });
            return;
          }
          var fp = (name && String(name).trim()) ? String(name).trim() : defaultName;
          if (fp.indexOf('.soon') === -1 || fp.slice(-5).toLowerCase() !== '.soon') {
            fp = (fp.replace(/\.soon$/i, '') || 'design') + '.soon';
          }
          resolve({ canceled: false, filePath: fp, useDownload: true });
          return;
        }
        window.showSaveFilePicker({
          suggestedName: defaultName,
          types: [{ description: 'SoonDesign', accept: { 'application/json': ['.soon'] } }]
        }).then(function (handle) {
          var filePath = (handle && handle.name) ? handle.name : defaultName;
          resolve({ canceled: false, filePath: filePath, fileHandle: handle });
        }).catch(function () {
          resolve({ canceled: true });
        });
      });
    },
    writeFile: function (pathOrHandle, content) {
      var isBlob = content instanceof Blob;
      var str = typeof content === 'string' ? content : (isBlob ? null : (content && content.toString ? content.toString() : ''));
      // File System Access API（浏览器原生文件保存）
      if (pathOrHandle && pathOrHandle.createWritable) {
        return pathOrHandle.createWritable().then(function (w) {
          if (isBlob) w.write(content);
          else w.write(str);
          return w.close();
        });
      }
      // 服务器环境：上传到服务器
      var name = typeof pathOrHandle === 'string' ? pathOrHandle : (isBlob ? 'output.pdf' : 'design.soon');
      var isServerEnv = typeof window !== 'undefined' && window.location && 
        (window.location.hostname !== 'localhost' && window.location.hostname !== '127.0.0.1' && window.location.protocol !== 'file:');
      
      if (isServerEnv && !isBlob && typeof fetch !== 'undefined') {
        // 上传到服务器
        var formData = new FormData();
        formData.append('fileName', name);
        formData.append('fileContent', str);
        
        return fetch(SERVER_API_BASE + 'save_file.php', {
          method: 'POST',
          body: formData
        }).then(function(response) {
          return response.json();
        }).then(function(result) {
          if (result.success) {
            return Promise.resolve();
          } else {
            throw new Error(result.error || '保存失败');
          }
        }).catch(function(err) {
          // 如果服务器保存失败，降级为下载
          console.warn('服务器保存失败，降级为下载:', err);
          var a = document.createElement('a');
          a.download = name;
          a.href = 'data:application/json;charset=utf-8,' + encodeURIComponent(str);
          a.click();
          return Promise.resolve();
        });
      }
      // 本地环境或 Blob：触发下载
      var a = document.createElement('a');
      a.download = name;
      if (isBlob) a.href = URL.createObjectURL(content);
      else a.href = 'data:application/json;charset=utf-8,' + encodeURIComponent(str);
      a.click();
      if (isBlob && a.href) URL.revokeObjectURL(a.href);
      return Promise.resolve();
    },
    readFile: function (pathOrHandle) {
      if (pathOrHandle && pathOrHandle.getFile) {
        return pathOrHandle.getFile().then(function (f) {
          return new Promise(function (res, rej) {
            var r = new FileReader();
            r.onload = function () { res(r.result); };
            r.onerror = rej;
            r.readAsArrayBuffer(f);
          });
        });
      }
      if (pathOrHandle && pathOrHandle.arrayBuffer) {
        return pathOrHandle.arrayBuffer();
      }
      return Promise.reject(new Error('No file'));
    },
    getAppVersion: function () { return Promise.resolve(VERSION); },
    getLocale: getLocale,
    getUserDataPath: function () { return ''; },
    getSystemFonts: getSystemFonts,
    openDesignPage: function (file, type) {
      var t = type || 1;
      if (file && typeof sessionStorage !== 'undefined') {
        try {
          sessionStorage.setItem('soondesign_open_file', file);
          sessionStorage.setItem('soondesign_open_type', String(t));
        } catch (e) {}
      }
      var fileParam = file ? encodeURIComponent(file) : '';
      navigateToPage('design' + t + '.web.html?file=' + fileParam + '&type=' + t);
    },
    openFirstPage: function () {
      var loc = typeof window !== 'undefined' ? window.location : null;
      if (!loc) return;
      // 显式拼站点根（与 getAppBasePathname 一致），避免「路径末尾斜杠 / URL API」与 navigateToPage('.') 在个别环境下的解析差异
      loc.href = loc.origin + getAppBasePathname();
    },
    onClose: function (callback) {
      if (typeof window !== 'undefined') {
        window.addEventListener('beforeunload', callback);
      }
    },
    runClose: function () {
      if (typeof window !== 'undefined' && window.close) window.close();
    },
    openHelp: function () {
      try {
        window.open(new URL('help/User Manual.pdf', window.location.href).href, '_blank');
      } catch (e) {
        window.open('help/User Manual.pdf', '_blank');
      }
    },
    printPdf: function (urlOrBlob) {
      var url = urlOrBlob;
      if (urlOrBlob && typeof urlOrBlob === 'object' && !(urlOrBlob instanceof String)) {
        url = URL.createObjectURL(urlOrBlob);
      }
      var w = window.open(url, '_blank');
      if (w) w.onload = function () { w.print(); };
    },
    getScaleRate: function () {
      return typeof window !== 'undefined' && window.devicePixelRatio ? window.devicePixelRatio : 1;
    },
    clipboard: {
      readText: function () {
        return navigator.clipboard && navigator.clipboard.readText ? navigator.clipboard.readText() : Promise.resolve('');
      },
      writeText: function (text) {
        if (navigator.clipboard && navigator.clipboard.writeText) {
          return navigator.clipboard.writeText(text);
        }
        return Promise.resolve();
      }
    }
  };

  window.platformBridge = bridge;

  var pathStub = {
    join: function () { return [].slice.call(arguments).join('/').replace(/\/+/g, '/'); }
  };

  window.sysAPI = {
    readHistory: bridge.readHistory,
    writeHistory: bridge.writeHistory,
    readJsonFile: bridge.readJsonFile,
    getAppVersion: bridge.getAppVersion
  };
  window.dialog = {
    showOpenDialog: bridge.showOpenDialog,
    showSaveDialog: bridge.showSaveDialog
  };
  window.path = pathStub;
  window.fs = null;
  window.remote = null;
  var loc = getLocale();
  window.ipcRenderer = {
    send: function (ch, a1, a2) {
      if (ch === 'get-sys-language') { window._sysLanPending = true; setTimeout(function () { if (window._sysLanCb && window._sysLanPending) { window._sysLanCb(null, loc); window._sysLanPending = false; } }, 0); }
      if (ch === 'open-first-page' && bridge.openFirstPage) { bridge.openFirstPage(); }
      if (ch === 'open-design-page' && bridge.openDesignPage && (a1 !== undefined || a2 !== undefined)) { bridge.openDesignPage(a1 || '', a2 || 1); }
      if (ch === 'open-help-file' && bridge.openHelp) { bridge.openHelp(); }
      if (ch === 'run-close' && bridge.runClose) { bridge.runClose(); }
    },
    on: function (ch, cb) {
      if (ch === 'sys-lan') { window._sysLanCb = cb; if (window._sysLanPending) setTimeout(function () { if (window._sysLanCb) { window._sysLanCb(null, loc); window._sysLanPending = false; } }, 0); }
      if (ch === 'close') window._closeCb = cb;
    }
  };
  window.clipboard = bridge.clipboard;
  window.exePath = '';
  window.fullPath = '';
})();