/**
 * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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.
 */

define(['require', 'lodash','jquery', 'log', 'backbone', 'file_browser', 'workspace/file'],
    function (require, _, $, log, Backbone, FileBrowser, File) {
    var ImportFileDialog = Backbone.View.extend(
        /** @lends SaveToFileDialog.prototype */
        {
            /**
             * @augments Backbone.View
             * @constructs
             * @class SaveToFileDialog
             * @param {Object} config configuration options for the SaveToFileDialog
             */
            initialize: function (options) {
                this.app = options;
                this.pathSeparator = this.app.getPathSeperator();
                this.dialog_container = $(_.get(options.config.dialog, 'container'));
                this.notification_container = _.get(options.config.tab_controller.tabs.tab.das_editor.notifications, 'container');
                this.source_view_container = _.get(options.config.tab_controller.tabs.tab.das_editor, 'source_view.container');
            },

            show: function(){
                this._fileImportModal.modal('show');
            },

            select: function(path){
                this._fileBrowser.select('path');
            },

            render: function () {
                var self = this;
                var fileBrowser;
                var fileContent;
                var app = this.app;
                var notification_container = this.notification_container;

                if(!_.isNil(this._fileImportModal)){
                    this._fileImportModal.remove();
                }

                var fileImport = $(
                    "<div class='modal fade' id='openConfigModal' tabindex='-1' role='dialog' aria-tydden='true'>" +
                    "<div class='modal-dialog file-dialog' role='document'>" +
                    "<div class='modal-content'>" +
                    "<div class='modal-header'>" +
                    "<button type='button' class='close' data-dismiss='modal' aria-label='Close'>" +
                    "<span aria-hidden='true'>&times;</span>" +
                    "</button>" +
                    "<h4 class='modal-title file-dialog-title'>Import File</h4>" +
                    "<hr class='style1'>"+
                    "</div>" +
                    "<div class='modal-body'>" +
                    "<div class='container-fluid'>" +
                    "<form class='form-horizontal' onsubmit='return false'>" +
                    "<div class='form-group'>" +
                    "<label for='location' class='col-sm-2 file-dialog-label'>File Name :</label>" +
                    "<div class='col-sm-9'>" +
                    "<input type='text' class='file-dialog-form-control' id='location' " +
                    "placeholder='eg: /home/user/wso2-das-server-tooling/deployment/workspace/sample.siddhi'>" +
                    "</div>" +
                    "</div>" +
                    "<div class='form-group'>" +
                    "<div class='file-dialog-form-scrollable-block'>" +
                    "<div id='fileTree'>" +
                    "</div>" +
                    "<div id='file-browser-error' class='alert alert-danger' style='display: none;'>" +
                    "</div>" +
                    "</div>" +
                    "</div>" +
                    "<div class='form-group'>" +
                    "<div class='file-dialog-form-btn'>" +
                    "<button id='importButton' type='button' class='btn btn-file-dialog'>import" +
                    "</button>" +
                    "<div class='divider'/>" +
                    "<button type='button' class='btn btn-file-dialog' data-dismiss='modal'>cancel</button>" +
                    "</div>" +
                    "</div>" +
                    "</form>" +
                    "<div id='openFileWizardError' class='alert alert-danger'>" +
                    "<strong>Error!</strong> Something went wrong." +
                    "</div>" +
                    "</div>" +
                    "</div>" +
                    "</div>" +
                    "</div>" +
                    "</div>"
                );

                var successNotification = $(
                    "<div style='z-index: 9999;' style='line-height: 20%;' class='alert alert-success' id='success-alert'>" +
                    "<span class='notification'>" +
                    "Configuration opened successfully !" +
                    "</span>" +
                    "</div>");

                function getErrorNotification(detailedErrorMsg) {
                    var errorMsg = "Error while opening configuration";
                    if (!_.isEmpty(detailedErrorMsg)){
                        errorMsg += (" : " + detailedErrorMsg);
                    }
                    return $(
                        "<div style='z-index: 9999;' style='line-height: 20%;' class='alert alert-danger' id='error-alert'>" +
                        "<span class='notification'>" +
                        errorMsg +
                        "</span>" +
                        "</div>");
                }

                var openConfigModal = fileImport.filter("#openConfigModal");
                var openFileWizardError = fileImport.find("#openFileWizardError");
                var location = fileImport.find("input").filter("#location");

                var treeContainer  = fileImport.find("div").filter("#fileTree")
                fileBrowser = new FileBrowser({container: treeContainer, application:app, fetchFiles:true, showWorkspace:false});

                fileBrowser.render();
                this._fileBrowser = fileBrowser;

                //Gets the selected location from tree and sets the value as location
                this.listenTo(fileBrowser, 'selected', function (selectedLocation) {
                    if(selectedLocation){
                        location.val(selectedLocation);
                    }
                });


                fileImport.find("button").filter("#importButton").click(function () {

                    var _location = location.val();
                    if (_.isEmpty(_location)) {
                        openFileWizardError.text("Invalid Value for Location.");
                        openFileWizardError.show();
                        return;
                    }
                    var pathAttributes = _location.split(self.pathSeparator);
                    var fileName = _.last(pathAttributes);
                    var existsResponse = existFileInPath({configName: fileName});

                    if(existsResponse){
                        openFileWizardError.text("A file already exist in workspace with selected name.");
                        openFileWizardError.show();
                        return;
                    } else{
                        importConfiguration({location: location});
                    }
                });


                $(this.dialog_container).append(fileImport);
                openFileWizardError.hide();
                this._fileImportModal = fileImport;

                function alertSuccess() {
                    $(notification_container).append(successNotification);
                    successNotification.fadeTo(2000, 200).slideUp(1000, function () {
                        successNotification.slideUp(1000);
                    });
                };

                function alertError(errorMessage) {
                    var errorNotification = getErrorNotification(errorMessage);
                    $(notification_container).append(errorNotification);
                    errorNotification.fadeTo(2000, 200).slideUp(1000, function () {
                        errorNotification.slideUp(1000);
                    });
                };

                function isJsonString(str) {
                    try {
                        JSON.parse(str);
                    } catch (e) {
                        return false;
                    }
                    return true;
                }

                function existFileInPath(options){
                    var client = self.app.workspaceManager.getServiceClient();
                    var data = {};
                    var workspaceServiceURL = app.config.services.workspace.endpoint;
                    var saveServiceURL = workspaceServiceURL + "/exists/workspace";
                    var payload = "configName=" + btoa(options.configName);

                    $.ajax({
                        type: "POST",
                        contentType: "text/plain; charset=utf-8",
                        url: saveServiceURL,
                        data: payload,
                        async: false,
                        success: function (response) {
                            data = response;
                        },
                        error: function(xhr, textStatus, errorThrown){
                            data = client.getErrorFromResponse(xhr, textStatus, errorThrown);
                            log.error(data.message);
                        }
                    });
                    return data;
                }

                function importConfiguration() {
                    var defaultView = {configLocation: location.val()};
                    var workspaceServiceURL = app.config.services.workspace.endpoint;
                    var importServiceURL = workspaceServiceURL + "/import";

                    var path = defaultView.configLocation;
                    $.ajax({
                        url: importServiceURL,
                        type: "POST",
                        data: path,
                        contentType: "text/plain; charset=utf-8",
                        async: false,
                        success: function (data, textStatus, xhr) {
                            if (xhr.status == 200) {
                                var pathArray = _.split(path, self.app.getPathSeperator()),
                                    fileName = _.last(pathArray),
                                    folderPath = _.join(_.take(pathArray, pathArray.length -1), self.app.getPathSeperator());

                                var file = new File({
                                    name: fileName,
                                    path: folderPath,
                                    content: data.content,
                                    isPersisted: true,
                                    isDirty: false
                                });
                                openConfigModal.modal('hide');
                                app.commandManager.dispatch("create-new-tab", {tabOptions: {file: file}});
                            } else {
                                openFileWizardError.text(data.Error);
                                openFileWizardError.show();
                            }
                        },
                        error: function (res, errorCode, error) {
                            var msg = _.isString(error) ? error : res.statusText;
                            if(isJsonString(res.responseText)){
                                var resObj = JSON.parse(res.responseText);
                                if(_.has(resObj, 'Error')){
                                    msg = _.get(resObj, 'Error');
                                }
                            }
                            openFileWizardError.text(msg);
                            openFileWizardError.show();
                        }
                    });
                };
            },
        });

    return ImportFileDialog;
});
