(function () {
  'use strict';

  var RECENT_KEY = 'soondesign_recent';
  var MIGRATED_KEY = 'soondesign_recent_migrated';
  var HISTORY_KEY = 'soondesign_history';
  var MAX_ITEMS = 20;

  function nowTimeStr() {
    var d = new Date();
    function pad(n) { return n < 10 ? '0' + n : String(n); }
    return d.getFullYear() + '-' + pad(d.getMonth() + 1) + '-' + pad(d.getDate()) + ' ' +
      pad(d.getHours()) + ':' + pad(d.getMinutes()) + ':' + pad(d.getSeconds());
  }

  function readRaw() {
    try {
      var raw = localStorage.getItem(RECENT_KEY);
      if (!raw) return { version: 1, items: [] };
      var j = JSON.parse(raw);
      if (!j || !Array.isArray(j.items)) return { version: 1, items: [] };
      return j;
    } catch (e) {
      return { version: 1, items: [] };
    }
  }

  function writeRaw(data) {
    try {
      localStorage.setItem(RECENT_KEY, JSON.stringify(data));
      return true;
    } catch (e) {
      return false;
    }
  }

  function soonRecentKindFromKey(key) {
    if (!key) return 'local';
    if (key.indexOf('soondesign_file:') === 0) return 'cloud';
    if (key.indexOf('soondesign_template:') === 0) return 'template';
    return 'local';
  }

  function parseFileId(key) {
    var m = String(key).match(/^soondesign_file:(\d+)/);
    return m ? parseInt(m[1], 10) : null;
  }

  function soonRecentList() {
    return readRaw().items.slice();
  }

  function soonRecentRemove(key) {
    if (!key) return;
    var data = readRaw();
    data.items = data.items.filter(function (it) { return it.key !== key; });
    writeRaw(data);
  }

  function soonRecentUpsert(item) {
    if (!item || !item.key) return;
    var key = item.key;
    var kind = item.kind || soonRecentKindFromKey(key);
    var type = item.type != null ? item.type : 1;
    var name = item.name || '';
    if (!name && typeof window.soonDisplayFileName === 'function') {
      name = window.soonDisplayFileName(key);
    }
    var entry = {
      key: key,
      name: name || 'design.soon',
      type: type,
      kind: kind,
      fileId: item.fileId != null ? item.fileId : parseFileId(key),
      thumbRef: item.thumbRef || key,
      time: item.time || nowTimeStr()
    };
    var data = readRaw();
    data.items = data.items.filter(function (it) { return it.key !== key; });
    data.items.unshift(entry);
    if (data.items.length > MAX_ITEMS) data.items = data.items.slice(0, MAX_ITEMS);
    writeRaw(data);
  }

  function soonRecentUpsertFromOpen(fileKey, json) {
    if (!fileKey) return;
    var type = 1;
    if (json) {
      type = json.soonType ? json.soonType : (json.backBlackPic ? 2 : 1);
    }
    var name = '';
    if (typeof window.soonDisplayFileName === 'function') name = window.soonDisplayFileName(fileKey);
    var tplMeta = window._soonTemplateMeta;
    if (tplMeta && tplMeta.name && fileKey.indexOf('soondesign_template:') === 0) {
      name = tplMeta.name;
      if (tplMeta.type) type = tplMeta.type;
    }
    var fileMeta = window._soonFileMeta;
    if (fileMeta && fileMeta.name && fileKey.indexOf('soondesign_file:') === 0) {
      name = fileMeta.name;
    }
    soonRecentUpsert({
      key: fileKey,
      name: name,
      type: type,
      kind: soonRecentKindFromKey(fileKey),
      fileId: parseFileId(fileKey),
      thumbRef: fileKey,
      time: nowTimeStr(),
      updated_at: (tplMeta && tplMeta.updated_at) ? tplMeta.updated_at : undefined
    });
  }

  function soonRecentMigrateFromHistory() {
    try {
      if (localStorage.getItem(MIGRATED_KEY) === '1') return;
    } catch (e) { return; }
    var histRaw;
    try {
      histRaw = localStorage.getItem(HISTORY_KEY);
    } catch (e) { return; }
    if (!histRaw) {
      try { localStorage.setItem(MIGRATED_KEY, '1'); } catch (e2) { /* ignore */ }
      return;
    }
    var hist;
    try {
      hist = JSON.parse(histRaw);
    } catch (e) {
      try { localStorage.setItem(MIGRATED_KEY, '1'); } catch (e2) { /* ignore */ }
      return;
    }
    var list = (hist && Array.isArray(hist.history)) ? hist.history : [];
    list.forEach(function (h) {
      if (!h || !h.path) return;
      soonRecentUpsert({
        key: h.path,
        name: typeof window.soonDisplayFileName === 'function' ? window.soonDisplayFileName(h.path) : h.path,
        type: h.type || 1,
        kind: soonRecentKindFromKey(h.path),
        fileId: parseFileId(h.path),
        thumbRef: h.path,
        time: h.time || nowTimeStr()
      });
    });
    try { localStorage.setItem(MIGRATED_KEY, '1'); } catch (e) { /* ignore */ }
  }

  function soonRecentEnrichFromCloud(items, cloudItems) {
    if (!items || !items.length || !cloudItems || !cloudItems.length) return items;
    var byId = {};
    cloudItems.forEach(function (c) {
      if (c && c.id != null) byId[c.id] = c;
    });
    return items.map(function (it) {
      if (!it.fileId || !byId[it.fileId]) return it;
      var c = byId[it.fileId];
      var copy = Object.assign({}, it);
      if (c.name) copy.name = c.name;
      var curKey = it.filePath || it.key;
      if (c.version != null && typeof window.soonMakeFileKey === 'function') {
        var newKey = window.soonMakeFileKey(c.id, c.version);
        if (newKey !== curKey) {
          soonRecentRemove(curKey);
          copy.filePath = newKey;
          copy.key = newKey;
          copy.thumbRef = newKey;
          soonRecentUpsert({
            key: newKey,
            name: copy.name,
            type: copy.type,
            kind: soonRecentKindFromKey(newKey),
            fileId: c.id,
            thumbRef: newKey
          });
        }
      }
      return copy;
    });
  }

  function soonRecentOnCloudSave(res, prevKey, type) {
    if (!res || !res.fileKey) return;
    var dropKeys = {};
    if (prevKey && prevKey !== res.fileKey) dropKeys[prevKey] = 1;
    if (res.fileId != null) {
      readRaw().items.forEach(function (it) {
        if (it.fileId === res.fileId && it.key !== res.fileKey) dropKeys[it.key] = 1;
      });
    }
    Object.keys(dropKeys).forEach(function (k) {
      soonRecentRemove(k);
      if (typeof window.soonLocalRemove === 'function') window.soonLocalRemove(k);
    });
    var name = res.name || '';
    if (!name && typeof window.soonDisplayFileName === 'function') {
      name = window.soonDisplayFileName(res.fileKey);
    }
    soonRecentUpsert({
      key: res.fileKey,
      name: name || 'design.soon',
      type: type != null ? type : 1,
      kind: soonRecentKindFromKey(res.fileKey),
      fileId: res.fileId,
      thumbRef: res.fileKey
    });
  }

  window.soonRecentList = soonRecentList;
  window.soonRecentRemove = soonRecentRemove;
  window.soonRecentUpsert = soonRecentUpsert;
  window.soonRecentUpsertFromOpen = soonRecentUpsertFromOpen;
  window.soonRecentMigrateFromHistory = soonRecentMigrateFromHistory;
  window.soonRecentKindFromKey = soonRecentKindFromKey;
  window.soonRecentEnrichFromCloud = soonRecentEnrichFromCloud;
  window.soonRecentOnCloudSave = soonRecentOnCloudSave;
})();