// (C) Copyright 2015 Martin Dougiamas
//
// 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.
import { Injector, Injectable } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
import { AddonModDataFieldHandler } from '../../../providers/fields-delegate';
import { AddonModDataFieldCheckboxComponent } from '../component/checkbox';

/**
 * Handler for checkbox data field plugin.
 */
@Injectable()
export class AddonModDataFieldCheckboxHandler implements AddonModDataFieldHandler {
    name = 'AddonModDataFieldCheckboxHandler';
    type = 'checkbox';

    constructor(private translate: TranslateService) { }

    /**
     * Return the Component to use to display the plugin data.
     * It's recommended to return the class of the component, but you can also return an instance of the component.
     *
     * @param {Injector} injector Injector.
     * @param {any} field         The field object.
     * @return {any|Promise<any>} The component (or promise resolved with component) to use, undefined if not found.
     */
    getComponent(injector: Injector, plugin: any): any | Promise<any> {
        return AddonModDataFieldCheckboxComponent;
    }

    /**
     * Get field search data in the input data.
     *
     * @param  {any} field      Defines the field to be rendered.
     * @param  {any} inputData  Data entered in the search form.
     * @return {any}            With name and value of the data to be sent.
     */
    getFieldSearchData(field: any, inputData: any): any {
        const fieldName = 'f_' + field.id,
            reqName = 'f_' + field.id + '_allreq';

        const options = field.param1.split('\n'),
            checkboxes = [],
            values = [];
        options.forEach((option) => {
            if (inputData[fieldName + '_' + option]) {
                checkboxes.push(option);
            }
        });

        if (checkboxes.length > 0) {
            values.push({
                name: fieldName,
                value: checkboxes
            });

            if (inputData[reqName]) {
                values.push({
                    name: reqName,
                    value: true
                });
            }

            return values;
        }

        return false;
    }

    /**
     * Get field edit data in the input data.
     *
     * @param  {any} field      Defines the field to be rendered.
     * @param  {any} inputData  Data entered in the edit form.
     * @return {any}            With name and value of the data to be sent.
     */
    getFieldEditData(field: any, inputData: any, originalFieldData: any): any {
        const fieldName = 'f_' + field.id;

        const options = field.param1.split('\n'),
            checkboxes = [];
        options.forEach((option) => {
            if (inputData[fieldName + '_' + option]) {
                checkboxes.push(option);
            }
        });
        if (checkboxes.length > 0) {
            return [{
                fieldid: field.id,
                value: checkboxes
            }];
        }

        return false;
    }

    /**
     * Get field data in changed.
     *
     * @param  {any} field                  Defines the field to be rendered.
     * @param  {any} inputData              Data entered in the edit form.
     * @param  {any} originalFieldData      Original field entered data.
     * @return {Promise<boolean> | boolean} If the field has changes.
     */
    hasFieldDataChanged(field: any, inputData: any, originalFieldData: any): Promise<boolean> | boolean {
        const fieldName = 'f_' + field.id,
            checkboxes = [];

        inputData[fieldName].forEach((value, option) => {
            if (value) {
                checkboxes.push(option);
            }
        });

        originalFieldData = (originalFieldData && originalFieldData.content) || '';

        return checkboxes.join('##') != originalFieldData;
    }

    /**
     * Check and get field requeriments.
     *
     * @param  {any} field               Defines the field to be rendered.
     * @param  {any} inputData           Data entered in the edit form.
     * @return {string | false}                  String with the notification or false.
     */
    getFieldsNotifications(field: any, inputData: any): string | false {
        if (field.required && (!inputData || !inputData.length || !inputData[0].value)) {
            return this.translate.instant('addon.mod_data.errormustsupplyvalue');
        }

        return false;
    }

    /**
     * Override field content data with offline submission.
     *
     * @param  {any}  originalContent    Original data to be overriden.
     * @param  {any}  offlineContent     Array with all the offline data to override.
     * @param  {any}  [offlineFiles]     Array with all the offline files in the field.
     * @return {any}                     Data overriden
     */
    overrideData(originalContent: any, offlineContent: any, offlineFiles?: any): any {
        originalContent.content = (offlineContent[''] && offlineContent[''].join('##')) || '';

        return originalContent;
    }

    /**
     * Whether or not the handler is enabled on a site level.
     *
     * @return {boolean|Promise<boolean>} True or promise resolved with true if enabled.
     */
    isEnabled(): boolean | Promise<boolean> {
        return true;
    }
}