/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

define('views/fields/multi-enum', ['views/fields/array', 'lib!Selectize'], function (Dep, Selectize) {

    return Dep.extend({

        type: 'multiEnum',

        listTemplate: 'fields/array/list',

        detailTemplate: 'fields/array/detail',

        editTemplate: 'fields/multi-enum/edit',

        events: {
        },

        data: function () {
            return _.extend({
                optionList: this.params.options || []
            }, Dep.prototype.data.call(this));
        },

        getTranslatedOptions: function () {
            return (this.params.options || []).map(function (item) {
                if (this.translatedOptions != null) {
                    if (item in this.translatedOptions) {
                        return this.translatedOptions[item];
                    }
                }
                return item;
            });
        },

        setup: function () {
            Dep.prototype.setup.call(this);

            if (this.restoreOnBackspace &&  !('restore_on_backspace_espo' in Selectize.plugins)) {
                this.loadRestoreOnBackspavePlugin();
            }
        },

        loadRestoreOnBackspavePlugin: function () {

            Selectize.define('restore_on_backspace_espo', function(options) {
                var self = this;

                Selectize.restoreOnBackspacePluginLoaded = true;

                options.text = options.text || function(option) {
                    return option[this.settings.labelField];
                };

                this.onKeyDown = (function() {
                    var original = self.onKeyDown;
                    return function(e) {
                        var index, option;
                        if (e.keyCode === 8 && this.$control_input.val() === '' && !this.$activeItems.length) {
                            index = this.caretPos - 1;
                            if (index >= 0 && index < this.items.length) {
                                option = this.options[this.items[index]];
                                option = {
                                    value: option.value,
                                    $order: option.$order,
                                    label: option.value,
                                };
                                if (this.deleteSelection(e)) {
                                    this.setTextboxValue(options.text.apply(this, [option]));
                                    this.refreshOptions(true);
                                }
                                e.preventDefault();
                                return;
                            }
                        }
                        return original.apply(this, arguments);
                    };
                })();
            });
        },

        afterRender: function () {
            if (this.mode == 'edit') {
                var $element = this.$element = this.$el.find('[data-name="' + this.name + '"]');

                var data = [];

                var valueList = Espo.Utils.clone(this.selected);
                for (var i in valueList) {
                    var value = valueList[i];
                    if (valueList[i] === '') {
                        valueList[i] = '__emptystring__';
                    }
                    if (!~(this.params.options || []).indexOf(value)) {
                        data.push({
                            value: value,
                            label: value
                        });
                    }
                }

                this.$element.val(valueList.join(':,:'));

                (this.params.options || []).forEach(function (value) {
                    var label = this.getLanguage().translateOption(value, this.name, this.scope);
                    if (this.translatedOptions) {
                        if (value in this.translatedOptions) {
                            label = this.translatedOptions[value];
                        }
                    }
                    if (value === '') {
                        value = '__emptystring__';
                    }
                    if (label === '') {
                        label = this.translate('None');
                    }
                    data.push({
                        value: value,
                        label: label
                    });
                }, this);

                var pluginList = ['remove_button', 'drag_drop'];

                if (this.restoreOnBackspace) {
                    pluginList.push('restore_on_backspace_espo');
                }

                var selectizeOptions = {
                    options: data,
                    delimiter: ':,:',
                    labelField: 'label',
                    valueField: 'value',
                    highlight: false,
                    searchField: ['label'],
                    plugins: pluginList,
                    score: function (search) {
                        var score = this.getScoreFunction(search);
                        search = search.toLowerCase();
                        return function (item) {
                            if (item.label.toLowerCase().indexOf(search) === 0) {
                                return score(item);
                            }
                            return 0;
                        };
                    }
                };

                if (this.allowCustomOptions) {
                    selectizeOptions.persist = false;
                    selectizeOptions.create = function (input) {
                        return {
                            value: input,
                            label: input
                        }
                    };
                    selectizeOptions.render = {
                        option_create: function (data, escape) {
                            return '<div class="create"><strong>' + escape(data.input) + '</strong>&hellip;</div>';
                        }
                    };
                }

                this.$element.selectize(selectizeOptions);

                this.$element.on('change', function () {
                    this.trigger('change');
                }.bind(this));
            }

            if (this.mode == 'search') {
                this.renderSearch();
            }
        },

        fetch: function () {
            var list = this.$element.val().split(':,:');
            if (list.length == 1 && list[0] == '') {
                list = [];
            }
            for (var i in list) {
                if (list[i] === '__emptystring__') {
                    list[i] = '';
                }
            }

            if (this.params.isSorted && this.translatedOptions) {
                list = list.sort(function (v1, v2) {
                     return (this.translatedOptions[v1] || v1).localeCompare(this.translatedOptions[v2] || v2);
                }.bind(this));
            }

            var data = {};
            data[this.name] = list;
            return data;
        },

        validateRequired: function () {
            if (this.isRequired()) {
                var value = this.model.get(this.name);
                if (!value || value.length == 0) {
                    var msg = this.translate('fieldIsRequired', 'messages').replace('{field}', this.getLabelText());
                    this.showValidationMessage(msg, '.selectize-control');
                    return true;
                }
            }
        },

        validateMaxCount: function () {
            if (this.params.maxCount) {
                var itemList = this.model.get(this.name) || [];
                if (itemList.length > this.params.maxCount) {
                    var msg =
                        this.translate('fieldExceedsMaxCount', 'messages')
                            .replace('{field}', this.getLabelText())
                            .replace('{maxCount}', this.params.maxCount.toString());
                    this.showValidationMessage(msg, '.selectize-control');
                    return true;
                }
            }
        },
    });
});
