// (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 { Injectable } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';
import { AddonModAssignSubmissionHandler } from './submission-delegate';

/**
 * Default handler used when a submission plugin doesn't have a specific implementation.
 */
@Injectable()
export class AddonModAssignDefaultSubmissionHandler implements AddonModAssignSubmissionHandler {
    name = 'AddonModAssignDefaultSubmissionHandler';
    type = 'default';

    constructor(private translate: TranslateService) { }

    /**
     * Whether the plugin can be edited in offline for existing submissions. In general, this should return false if the
     * plugin uses Moodle filters. The reason is that the app only prefetches filtered data, and the user should edit
     * unfiltered data.
     *
     * @param {any} assign The assignment.
     * @param {any} submission The submission.
     * @param {any} plugin The plugin object.
     * @return {boolean|Promise<boolean>} Boolean or promise resolved with boolean: whether it can be edited in offline.
     */
    canEditOffline(assign: any, submission: any, plugin: any): boolean | Promise<boolean> {
        return false;
    }

    /**
     * Get files used by this plugin.
     * The files returned by this function will be prefetched when the user prefetches the assign.
     *
     * @param {any} assign The assignment.
     * @param {any} submission The submission.
     * @param {any} plugin The plugin object.
     * @param {string} [siteId] Site ID. If not defined, current site.
     * @return {any[]|Promise<any[]>} The files (or promise resolved with the files).
     */
    getPluginFiles(assign: any, submission: any, plugin: any, siteId?: string): any[] | Promise<any[]> {
        return [];
    }

    /**
     * Get a readable name to use for the plugin.
     *
     * @param {any} plugin The plugin object.
     * @return {string} The plugin name.
     */
    getPluginName(plugin: any): string {
        // Check if there's a translated string for the plugin.
        const translationId = 'addon.mod_assign_submission_' + plugin.type + '.pluginname',
            translation = this.translate.instant(translationId);

        if (translationId != translation) {
            // Translation found, use it.
            return translation;
        }

        // Fallback to WS string.
        if (plugin.name) {
            return plugin.name;
        }
    }

    /**
     * Get the size of data (in bytes) this plugin will send to copy a previous submission.
     *
     * @param {any} assign The assignment.
     * @param {any} plugin The plugin object.
     * @return {number|Promise<number>} The size (or promise resolved with size).
     */
    getSizeForCopy(assign: any, plugin: any): number | Promise<number> {
        return 0;
    }

    /**
     * Get the size of data (in bytes) this plugin will send to add or edit a submission.
     *
     * @param {any} assign The assignment.
     * @param {any} plugin The plugin object.
     * @return {number|Promise<number>} The size (or promise resolved with size).
     */
    getSizeForEdit(assign: any, plugin: any): number | Promise<number> {
        return 0;
    }

    /**
     * Check if the submission data has changed for this plugin.
     *
     * @param {any} assign The assignment.
     * @param {any} submission The submission.
     * @param {any} plugin The plugin object.
     * @param {any} inputData Data entered by the user for the submission.
     * @return {boolean|Promise<boolean>} Boolean (or promise resolved with boolean): whether the data has changed.
     */
    hasDataChanged(assign: any, submission: any, plugin: any, inputData: any): boolean | Promise<boolean> {
        return false;
    }

    /**
     * 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;
    }

    /**
     * Whether or not the handler is enabled for edit on a site level.
     * @return {boolean|Promise<boolean>} Whether or not the handler is enabled for edit on a site level.
     */
    isEnabledForEdit(): boolean | Promise<boolean> {
        return false;
    }
}