import {PromptName, RuleField} from '@commitlint/types';
import {Answers, DistinctQuestion} from 'inquirer';

import Question, {QuestionConfig} from './Question.js';
import getRuleQuestionConfig from './services/getRuleQuestionConfig.js';
import {getPromptSettings} from './store/prompts.js';

export class HeaderQuestion extends Question {
	headerMaxLength: number;
	headerMinLength: number;
	constructor(
		name: PromptName,
		questionConfig: QuestionConfig,
		headerMaxLength?: number,
		headerMinLength?: number
	) {
		super(name, questionConfig);
		this.headerMaxLength = headerMaxLength ?? Infinity;
		this.headerMinLength = headerMinLength ?? 0;
	}
	beforeQuestionStart(answers: Answers): void {
		const headerRemainLength =
			this.headerMaxLength - combineCommitMessage(answers).length;
		this.maxLength = Math.min(this.maxLength, headerRemainLength);
		this.minLength = Math.min(this.minLength, this.headerMinLength);
	}
}

export function combineCommitMessage(answers: Answers): string {
	const {type = '', scope = '', subject = ''} = answers;
	const prefix = `${type}${scope ? `(${scope})` : ''}`;

	if (subject) {
		return ((prefix ? prefix + ': ' : '') + subject).trim();
	} else {
		return prefix.trim();
	}
}

export function getQuestions(): Array<DistinctQuestion> {
	// header: type, scope, subject
	const questions: Array<DistinctQuestion> = [];

	const headerRuleFields: RuleField[] = ['type', 'scope', 'subject'];
	const headerRuleQuestionConfig = getRuleQuestionConfig('header');

	if (!headerRuleQuestionConfig) {
		return [];
	}

	headerRuleFields.forEach((name) => {
		const questionConfig = getQuestionConfig(name);
		if (questionConfig) {
			const instance = new HeaderQuestion(
				name,
				questionConfig,
				headerRuleQuestionConfig.maxLength,
				headerRuleQuestionConfig.minLength
			);
			questions.push(instance.question);
		}
	});
	return questions;
}

export function getQuestionConfig(
	name: RuleField
): ReturnType<typeof getRuleQuestionConfig> {
	const questionConfig = getRuleQuestionConfig(name);

	if (questionConfig) {
		if (name === 'scope') {
			if (getPromptSettings()['enableMultipleScopes']) {
				questionConfig.multipleSelectDefaultDelimiter =
					getPromptSettings()['scopeEnumSeparator'];
			}
			// split scope string to segments, match commitlint rules
			questionConfig.multipleValueDelimiters = /\/|\\|,/g;
		}
	}

	return questionConfig;
}