/**
 * Based on https://github.com/dwengovzw/Learning-Object-Repository/blob/main/app/processors/gift/gift_processor.js
 */

import DOMPurify from 'isomorphic-dompurify';
import { GIFTQuestion, parse } from 'gift-pegjs';
import { DwengoContentType } from '../content-type.js';
import { GIFTQuestionRenderer } from './question-renderers/gift-question-renderer.js';
import { MultipleChoiceQuestionRenderer } from './question-renderers/multiple-choice-question-renderer.js';
import { CategoryQuestionRenderer } from './question-renderers/category-question-renderer.js';
import { DescriptionQuestionRenderer } from './question-renderers/description-question-renderer.js';
import { EssayQuestionRenderer } from './question-renderers/essay-question-renderer.js';
import { MatchingQuestionRenderer } from './question-renderers/matching-question-renderer.js';
import { NumericalQuestionRenderer } from './question-renderers/numerical-question-renderer.js';
import { ShortQuestionRenderer } from './question-renderers/short-question-renderer.js';
import { TrueFalseQuestionRenderer } from './question-renderers/true-false-question-renderer.js';
import { StringProcessor } from '../string-processor.js';

class GiftProcessor extends StringProcessor {
    private renderers: RendererMap = {
        Category: new CategoryQuestionRenderer(),
        Description: new DescriptionQuestionRenderer(),
        Essay: new EssayQuestionRenderer(),
        Matching: new MatchingQuestionRenderer(),
        Numerical: new NumericalQuestionRenderer(),
        Short: new ShortQuestionRenderer(),
        TF: new TrueFalseQuestionRenderer(),
        MC: new MultipleChoiceQuestionRenderer(),
    };

    constructor() {
        super(DwengoContentType.GIFT);
    }

    override renderFn(giftString: string): string {
        const quizQuestions: GIFTQuestion[] = parse(giftString);

        let html = "<div class='learning-object-gift'>\n";
        let i = 1;
        for (const question of quizQuestions) {
            html += `    <div class='gift-question' id='gift-q${i}'>\n`;
            html += '        ' + this.renderQuestion(question, i).replaceAll(/\n(.+)/g, '\n        $1'); // Replace for indentation.
            html += `    </div>\n`;
            i++;
        }
        html += '</div>\n';

        return DOMPurify.sanitize(html);
    }

    private renderQuestion<T extends GIFTQuestion>(question: T, questionNumber: number): string {
        const renderer = this.renderers[question.type] as GIFTQuestionRenderer<T>;
        return renderer.render(question, questionNumber);
    }
}

type RendererMap = {
    [K in GIFTQuestion['type']]: GIFTQuestionRenderer<Extract<GIFTQuestion, { type: K }>>;
};

export default GiftProcessor;