"use strict";

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Cognos Analytics
 * Copyright IBM Corp. 2016, 2019
 * US Government Users Restricted Rights - Use, duplication or disclosure
 * restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['underscore', 'bi/glass/core/Class', 'bi/admin/nls/StringResource', 'bi/glass/common/ui/ProgressToast'], function (_, Class, StringResource, ProgressToast) {
  'use strict'; //NOSONAR: meant to be strict

  var Uploader = Class.extend({
    includeFileName: false,

    /**
     *@options.glassContext - glassContext
     *@options.$el - Container
     *@options.ajax() - ajax function to upload data
     *@options.ajaxOptions
     */
    init: function init(options) {
      Uploader.inherited('init', this, arguments);

      _.extend(this, options);
    },

    /**
     * For testing purposes
     */
    _getWindow: function _getWindow() {
      return window;
    },

    /**
     * For testing purposes
     */
    _getNavigator: function _getNavigator() {
      return navigator;
    },

    /**
     * Starting point for using uploader. Prompts user to select a file from browser/OS file selector
     */
    doUpload: function doUpload() {
      return new Promise(function (resolve, reject) {
        var application = this.glassContext.appController;

        if (!this._getWindow().File || !this._getWindow().FileReader || !this._getWindow().FileList || !this._getWindow().Blob) {
          application.showErrorMessage(StringResource.get('errorHTML5Support'), StringResource.get('error'));
          reject();
        } else if (/^((?!chrome).)*safari\/537/i.test(this._getNavigator().userAgent)) {
          application.showErrorMessage(StringResource.get('errorUploadSupport'), StringResource.get('error'));
          reject();
        } else {
          this._removeInput();

          var $input = this._getInput();

          this.$el.append($input);
          $input.change(function (e) {
            this._verifyAndUpload(e).then(resolve, reject);
          }.bind(this)); // hack: this is for functional testing purpose to stop prompting with the browser file picker

          if (!document.getElementById('skipInvokingFileSelectionAdmin')) {
            $input.click();
          }
        }
      }.bind(this));
    },
    _getBaseInputOptions: function _getBaseInputOptions() {
      return {
        'type': 'file',
        'id': 'idUploadUIElement',
        'name': 'uploadfiles',
        'style': 'display: none;',
        'multiple': false
      };
    },
    _getInput: function _getInput() {
      var inputOptions = this._getBaseInputOptions();

      if (this.fileType && this.fileType === 'csv') {
        inputOptions.accept = '.csv';
      } else {
        inputOptions.accept = 'application/zip';
      }

      return $('<input>', inputOptions);
    },
    _verifyAndUpload: function _verifyAndUpload(evt) {
      return Promise.try(function () {
        var currFile = evt.target.files[0];
        var configMaxSize = 500;
        var maxFileSizeInByte = configMaxSize * 1024 * 1024;
        var errMsg;

        if (_.isUndefined(currFile.size) || currFile.size > maxFileSizeInByte) {
          errMsg = StringResource.get('msgHardLimitFileUpload', {
            'message': configMaxSize
          });
          this.glassContext.appController.showErrorMessage(errMsg, StringResource.get('error'));
        } else if (!this._isValidFileName(currFile.name)) {
          errMsg = this._getInvalidFileNameMessage();
          this.glassContext.appController.showErrorMessage(errMsg, StringResource.get('msgFileNameUploadTitle'));
        } else {
          return this._uploadProcessor(currFile);
        }

        throw new Error(errMsg);
      }.bind(this));
    },
    _isValidFileName: function _isValidFileName(fileName) {
      if (this.fileType === 'csv') {
        return /^[a-z0-9_ \-\.]{1,200}\.csv$/i.test(fileName);
      } else {
        return /^[a-z0-9_ \-\.]{1,200}\.zip$/i.test(fileName);
      }
    },
    // NB - the message returned should match regexp above
    _getInvalidFileNameMessage: function _getInvalidFileNameMessage() {
      return StringResource.get('msgFileNameUpload');
    },

    /**
     * For testing purposes
     */
    _createFileReader: function _createFileReader() {
      return new FileReader();
    },

    /**
     * For testing purposes
     */
    _createProgressToast: function _createProgressToast() {
      return new ProgressToast();
    },
    _uploadProcessor: function _uploadProcessor(currFile) {
      return new Promise(function (resolve, reject) {
        this.progressBar = this._createProgressToast();

        var reader = this._createFileReader();

        this.progressBar.show(StringResource.get('msgUploadStarted'));
        this.progressBar.progress();
        this.progressBar.onCancel(function () {
          try {
            reader.abort();
          } catch (e) {
            return;
          }
        }.bind(this));

        reader.onerror = function () {
          this.progressBar.fail(StringResource.get('errorReadingFile'));
          reject();
        }.bind(this);

        reader.onabort = function () {
          this.progressBar.fail(StringResource.get('abortReadingFile'));
          reject();
        }.bind(this);

        reader.onprogress = function (e) {
          var percentLoaded = Math.round(e.loaded / e.total * 100);
          this.progressBar.setComplete(percentLoaded);
        }.bind(this);

        reader.onload = function (e) {
          this._readerOnload(currFile.name, e).then(resolve, reject);
        }.bind(this);

        reader.readAsArrayBuffer(currFile);
      }.bind(this));
    },
    _readerOnload: function _readerOnload(fileName, e) {
      this.progressBar.indefinite(StringResource.get('msgUploadToServer'));
      var options = {
        'data': e.target.result,
        'byteLength': e.target.result.byteLength
      };

      if (this.includeFileName) {
        options.fileName = this._getFileName(fileName, e);
      }

      _.extend(options, this.ajaxOptions);

      return this.ajax(options).then(function () {
        this.progressBar.setComplete(100, {
          isComplete: true,
          completeMsg: StringResource.get('msgFileUploadSuccess')
        });
      }.bind(this), function (err) {
        if (err.jqXHR) {
          var jqXHR = err.jqXHR;

          if (!_.isUndefined(jqXHR.responseJSON) && !_.isUndefined(jqXHR.responseJSON.errors)) {
            var errors = jqXHR.responseJSON.errors;

            if (errors.length > 0) {
              this.glassContext.appController.showErrorMessage(errors[0].message, errors[0].code);
            }
          }
        }

        this.progressBar.remove("");
        throw jqXHR;
      }.bind(this));
    },
    _removeInput: function _removeInput() {
      this.$el.find('input#idUploadUIElement').remove();
    },
    _getFileName: function _getFileName(fileName, e) {
      return fileName;
    }
  });
  return Uploader;
});