text: "use strict";
  /**
   * @license
   * Copyright 2018 Google LLC. All Rights Reserved.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * =============================================================================
   */
  var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
      return new (P || (P = Promise))(function (resolve, reject) {
          function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
          function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
          function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
          step((generator = generator.apply(thisArg, _arguments || [])).next());
      });
  };
  var __generator = (this && this.__generator) || function (thisArg, body) {
      var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
      return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
      function verb(n) { return function (v) { return step([n, v]); }; }
      function step(op) {
          if (f) throw new TypeError("Generator is already executing.");
          while (_) try {
              if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
              if (y = 0, t) op = [op[0] & 2, t.value];
              switch (op[0]) {
                  case 0: case 1: t = op; break;
                  case 4: _.label++; return { value: op[1], done: false };
                  case 5: _.label++; y = op[1]; op = [0]; continue;
                  case 7: op = _.ops.pop(); _.trys.pop(); continue;
                  default:
                      if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                      if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                      if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                      if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                      if (t[2]) _.ops.pop();
                      _.trys.pop(); continue;
              }
              op = body.call(thisArg, _);
          } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
          if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
      }
  };
  Object.defineProperty(exports, "__esModule", { value: true });
  var environment_1 = require("../environment");
  var util_1 = require("../util");
  var io_utils_1 = require("./io_utils");
  var model_management_1 = require("./model_management");
  var router_registry_1 = require("./router_registry");
  var PATH_SEPARATOR = '/';
  var PATH_PREFIX = 'tensorflowjs_models';
  var INFO_SUFFIX = 'info';
  var MODEL_TOPOLOGY_SUFFIX = 'model_topology';
  var WEIGHT_SPECS_SUFFIX = 'weight_specs';
  var WEIGHT_DATA_SUFFIX = 'weight_data';
  var MODEL_METADATA_SUFFIX = 'model_metadata';
  /**
   * Purge all tensorflow.js-saved model artifacts from local storage.
   *
   * @returns Paths of the models purged.
   */
  function purgeLocalStorageArtifacts() {
      if (!environment_1.env().getBool('IS_BROWSER') ||
          typeof window.localStorage === 'undefined') {
          throw new Error('purgeLocalStorageModels() cannot proceed because local storage is ' +
              'unavailable in the current environment.');
      }
      var LS = window.localStorage;
      var purgedModelPaths = [];
      for (var i = 0; i < LS.length; ++i) {
          var key = LS.key(i);
          var prefix = PATH_PREFIX + PATH_SEPARATOR;
          if (key.startsWith(prefix) && key.length > prefix.length) {
              LS.removeItem(key);
              var modelName = getModelPathFromKey(key);
              if (purgedModelPaths.indexOf(modelName) === -1) {
                  purgedModelPaths.push(modelName);
              }
          }
      }
      return purgedModelPaths;
  }
  exports.purgeLocalStorageArtifacts = purgeLocalStorageArtifacts;
  function getModelKeys(path) {
      return {
          info: [PATH_PREFIX, path, INFO_SUFFIX].join(PATH_SEPARATOR),
          topology: [PATH_PREFIX, path, MODEL_TOPOLOGY_SUFFIX].join(PATH_SEPARATOR),
          weightSpecs: [PATH_PREFIX, path, WEIGHT_SPECS_SUFFIX].join(PATH_SEPARATOR),
          weightData: [PATH_PREFIX, path, WEIGHT_DATA_SUFFIX].join(PATH_SEPARATOR),
          modelMetadata: [PATH_PREFIX, path, MODEL_METADATA_SUFFIX].join(PATH_SEPARATOR)
      };
  }
  /**
   * Get model path from a local-storage key.
   *
   * E.g., 'tensorflowjs_models/my/model/1/info' --> 'my/model/1'
   *
   * @param key
   */
  function getModelPathFromKey(key) {
      var items = key.split(PATH_SEPARATOR);
      if (items.length < 3) {
          throw new Error("Invalid key format: " + key);
      }
      return items.slice(1, items.length - 1).join(PATH_SEPARATOR);
  }
  function maybeStripScheme(key) {
      return key.startsWith(BrowserLocalStorage.URL_SCHEME) ?
          key.slice(BrowserLocalStorage.URL_SCHEME.length) :
          key;
  }
  /**
   * IOHandler subclass: Browser Local Storage.
   *
   * See the doc string to `browserLocalStorage` for more details.
   */
  var BrowserLocalStorage = /** @class */ (function () {
      function BrowserLocalStorage(modelPath) {
          if (!environment_1.env().getBool('IS_BROWSER') ||
              typeof window.localStorage === 'undefined') {
              // TODO(cais): Add more info about what IOHandler subtypes are
              // available.
              //   Maybe point to a doc page on the web and/or automatically determine
              //   the available IOHandlers and print them in the error message.
              throw new Error('The current environment does not support local storage.');
          }
          this.LS = window.localStorage;
          if (modelPath == null || !modelPath) {
              throw new Error('For local storage, modelPath must not be null, undefined or empty.');
          }
          this.modelPath = modelPath;
          this.keys = getModelKeys(this.modelPath);
      }
      /**
       * Save model artifacts to browser local storage.
       *
       * See the documentation to `browserLocalStorage` for details on the saved
       * artifacts.
       *
       * @param modelArtifacts The model artifacts to be stored.
       * @returns An instance of SaveResult.
       */
      BrowserLocalStorage.prototype.save = function (modelArtifacts) {
          return __awaiter(this, void 0, void 0, function () {
              var topology, weightSpecs, modelArtifactsInfo;
              return __generator(this, function (_a) {
                  if (modelArtifacts.modelTopology instanceof ArrayBuffer) {
                      throw new Error('BrowserLocalStorage.save() does not support saving model topology ' +
                          'in binary formats yet.');
                  }
                  else {
                      topology = JSON.stringify(modelArtifacts.modelTopology);
                      weightSpecs = JSON.stringify(modelArtifacts.weightSpecs);
                      modelArtifactsInfo = io_utils_1.getModelArtifactsInfoForJSON(modelArtifacts);
                      try {
                          this.LS.setItem(this.keys.info, JSON.stringify(modelArtifactsInfo));
                          this.LS.setItem(this.keys.topology, topology);
                          this.LS.setItem(this.keys.weightSpecs, weightSpecs);
                          this.LS.setItem(this.keys.weightData, io_utils_1.arrayBufferToBase64String(modelArtifacts.weightData));
                          this.LS.setItem(this.keys.modelMetadata, JSON.stringify({
                              format: modelArtifacts.format,
                              generatedBy: modelArtifacts.generatedBy,
                              convertedBy: modelArtifacts.convertedBy
                          }));
                          return [2 /*return*/, { modelArtifactsInfo: modelArtifactsInfo }];
                      }
                      catch (err) {
                          // If saving failed, clean up all items saved so far.
                          this.LS.removeItem(this.keys.info);
                          this.LS.removeItem(this.keys.topology);
                          this.LS.removeItem(this.keys.weightSpecs);
                          this.LS.removeItem(this.keys.weightData);
                          this.LS.removeItem(this.keys.modelMetadata);
                          throw new Error("Failed to save model '" + this.modelPath + "' to local storage: " +
                              "size quota being exceeded is a possible cause of this failure: " +
                              ("modelTopologyBytes=" + modelArtifactsInfo.modelTopologyBytes + ", ") +
                              ("weightSpecsBytes=" + modelArtifactsInfo.weightSpecsBytes + ", ") +
                              ("weightDataBytes=" + modelArtifactsInfo.weightDataBytes + "."));
                      }
                  }
                  return [2 /*return*/];
              });
          });
      };
      /**
       * Load a model from local storage.
       *
       * See the documentation to `browserLocalStorage` for details on the saved
       * artifacts.
       *
       * @returns The loaded model (if loading succeeds).
       */
      BrowserLocalStorage.prototype.load = function () {
          return __awaiter(this, void 0, void 0, function () {
              var info, out, topology, weightSpecs, metadataString, metadata, weightDataBase64;
              return __generator(this, function (_a) {
                  info = JSON.parse(this.LS.getItem(this.keys.info));
                  if (info == null) {
                      throw new Error("In local storage, there is no model with name '" + this.modelPath + "'");
                  }
                  if (info.modelTopologyType !== 'JSON') {
                      throw new Error('BrowserLocalStorage does not support loading non-JSON model ' +
                          'topology yet.');
                  }
                  out = {};
                  topology = JSON.parse(this.LS.getItem(this.keys.topology));
                  if (topology == null) {
                      throw new Error("In local storage, the topology of model '" + this.modelPath + "' " +
                          "is missing.");
                  }
                  out.modelTopology = topology;
                  weightSpecs = JSON.parse(this.LS.getItem(this.keys.weightSpecs));
                  if (weightSpecs == null) {
                      throw new Error("In local storage, the weight specs of model '" + this.modelPath + "' " +
                          "are missing.");
                  }
                  out.weightSpecs = weightSpecs;
                  metadataString = this.LS.getItem(this.keys.modelMetadata);
                  if (metadataString != null) {
                      metadata = JSON.parse(metadataString);
                      out.format = metadata['format'];
                      out.generatedBy = metadata['generatedBy'];
                      out.convertedBy = metadata['convertedBy'];
                  }
                  weightDataBase64 = this.LS.getItem(this.keys.weightData);
                  if (weightDataBase64 == null) {
                      throw new Error("In local storage, the binary weight values of model " +
                          ("'" + this.modelPath + "' are missing."));
                  }
                  out.weightData = io_utils_1.base64StringToArrayBuffer(weightDataBase64);
                  return [2 /*return*/, out];
              });
          });
      };
      BrowserLocalStorage.URL_SCHEME = 'localstorage://';
      return BrowserLocalStorage;
  }());
  exports.BrowserLocalStorage = BrowserLocalStorage;
  exports.localStorageRouter = function (url) {
      if (!environment_1.env().getBool('IS_BROWSER')) {
          return null;
      }
      else {
          if (!Array.isArray(url) && url.startsWith(BrowserLocalStorage.URL_SCHEME)) {
              return browserLocalStorage(url.slice(BrowserLocalStorage.URL_SCHEME.length));
          }
          else {
              return null;
          }
      }
  };
  router_registry_1.IORouterRegistry.registerSaveRouter(exports.localStorageRouter);
  router_registry_1.IORouterRegistry.registerLoadRouter(exports.localStorageRouter);
  /**
   * Factory function for local storage IOHandler.
   *
   * This `IOHandler` supports both `save` and `load`.
   *
   * For each model's saved artifacts, four items are saved to local storage.
   *   - `${PATH_SEPARATOR}/${modelPath}/info`: Contains meta-info about the
   *     model, such as date saved, type of the topology, size in bytes, etc.
   *   - `${PATH_SEPARATOR}/${modelPath}/topology`: Model topology. For Keras-
   *     style models, this is a stringized JSON.
   *   - `${PATH_SEPARATOR}/${modelPath}/weight_specs`: Weight specs of the
   *     model, can be used to decode the saved binary weight values (see
   *     item below).
   *   - `${PATH_SEPARATOR}/${modelPath}/weight_data`: Concatenated binary
   *     weight values, stored as a base64-encoded string.
   *
   * Saving may throw an `Error` if the total size of the artifacts exceed the
   * browser-specific quota.
   *
   * @param modelPath A unique identifier for the model to be saved. Must be a
   *   non-empty string.
   * @returns An instance of `IOHandler`, which can be used with, e.g.,
   *   `tf.Model.save`.
   */
  function browserLocalStorage(modelPath) {
      return new BrowserLocalStorage(modelPath);
  }
  exports.browserLocalStorage = browserLocalStorage;
  var BrowserLocalStorageManager = /** @class */ (function () {
      function BrowserLocalStorageManager() {
          util_1.assert(environment_1.env().getBool('IS_BROWSER'), function () { return 'Current environment is not a web browser'; });
          util_1.assert(typeof window.localStorage !== 'undefined', function () { return 'Current browser does not appear to support localStorage'; });
          this.LS = window.localStorage;
      }
      BrowserLocalStorageManager.prototype.listModels = function () {
          return __awaiter(this, void 0, void 0, function () {
              var out, prefix, suffix, i, key, modelPath;
              return __generator(this, function (_a) {
                  out = {};
                  prefix = PATH_PREFIX + PATH_SEPARATOR;
                  suffix = PATH_SEPARATOR + INFO_SUFFIX;
                  for (i = 0; i < this.LS.length; ++i) {
                      key = this.LS.key(i);
                      if (key.startsWith(prefix) && key.endsWith(suffix)) {
                          modelPath = getModelPathFromKey(key);
                          out[modelPath] = JSON.parse(this.LS.getItem(key));
                      }
                  }
                  return [2 /*return*/, out];
              });
          });
      };
      BrowserLocalStorageManager.prototype.removeModel = function (path) {
          return __awaiter(this, void 0, void 0, function () {
              var keys, info;
              return __generator(this, function (_a) {
                  path = maybeStripScheme(path);
                  keys = getModelKeys(path);
                  if (this.LS.getItem(keys.info) == null) {
                      throw new Error("Cannot find model at path '" + path + "'");
                  }
                  info = JSON.parse(this.LS.getItem(keys.info));
                  this.LS.removeItem(keys.info);
                  this.LS.removeItem(keys.topology);
                  this.LS.removeItem(keys.weightSpecs);
                  this.LS.removeItem(keys.weightData);
                  return [2 /*return*/, info];
              });
          });
      };
      return BrowserLocalStorageManager;
  }());
  exports.BrowserLocalStorageManager = BrowserLocalStorageManager;
  if (environment_1.env().getBool('IS_BROWSER')) {
      // Wrap the construction and registration, to guard against browsers that
      // don't support Local Storage.
      try {
          model_management_1.ModelStoreManagerRegistry.registerManager(BrowserLocalStorage.URL_SCHEME, new BrowserLocalStorageManager());
      }
      catch (err) {
      }
  }
  //# sourceMappingURL=local_storage.js.map