import {NachklangFeedbackDB} from '../Feedback.db.js';
import {QuestionType} from '../feedback.interface.js';
import {AdminQuestion} from './admin.interface.js';

const mapRow = (row: any): AdminQuestion => ({
	questionId: row.question_id,
	label: row.label,
	helpText: row.help_text,
	questionType: row.question_type,
	isArchived: !!row.is_archived
});

export const listQuestions = async (includeArchived: boolean): Promise<AdminQuestion[]> => {
	let conn = await NachklangFeedbackDB.getConnection();
	try {
		const query = includeArchived
			? 'SELECT * FROM questions ORDER BY created_at DESC'
			: 'SELECT * FROM questions WHERE is_archived = 0 ORDER BY created_at DESC';
		const rows = await conn.query(query);
		return rows.map(mapRow);
	} finally {
		await conn.end();
	}
};

export const createQuestion = async (label: string, helpText: string | null, questionType: QuestionType): Promise<number> => {
	let conn = await NachklangFeedbackDB.getConnection();
	try {
		await conn.beginTransaction();
		const res = await conn.query(
			'INSERT INTO questions (label, help_text, question_type) VALUES (?,?,?) RETURNING question_id',
			[label, helpText, questionType]
		);
		await conn.commit();
		return res[0].question_id;
	} catch (err) {
		await conn.rollback();
		throw err;
	} finally {
		await conn.end();
	}
};

/**
 * Edits label/help text only. question_type is immutable after creation -
 * changing it would invalidate existing answers' question_type_snapshot
 * semantics. The admin UI offers "archive and create new" instead.
 */
export const updateQuestion = async (questionId: number, label: string, helpText: string | null): Promise<boolean> => {
	let conn = await NachklangFeedbackDB.getConnection();
	try {
		await conn.beginTransaction();
		const res = await conn.query('UPDATE questions SET label = ?, help_text = ? WHERE question_id = ?', [label, helpText, questionId]);
		await conn.commit();
		return res.affectedRows > 0;
	} catch (err) {
		await conn.rollback();
		throw err;
	} finally {
		await conn.end();
	}
};

export type RemoveQuestionResult = 'ARCHIVED' | 'DELETED' | 'NOT_FOUND';

/**
 * Archives (soft delete) a question. Hard-deletes it instead if it has
 * never been assigned to any event, so an admin's typo doesn't have to
 * live forever in the library.
 */
export const removeQuestion = async (questionId: number): Promise<RemoveQuestionResult> => {
	let conn = await NachklangFeedbackDB.getConnection();
	try {
		await conn.beginTransaction();

		const existsRows = await conn.query('SELECT 1 FROM questions WHERE question_id = ?', [questionId]);
		if (existsRows.length === 0) {
			await conn.rollback();
			return 'NOT_FOUND';
		}

		const usageRows = await conn.query('SELECT 1 FROM event_questions WHERE question_id = ? LIMIT 1', [questionId]);
		if (usageRows.length === 0) {
			await conn.query('DELETE FROM questions WHERE question_id = ?', [questionId]);
			await conn.commit();
			return 'DELETED';
		}

		await conn.query('UPDATE questions SET is_archived = 1 WHERE question_id = ?', [questionId]);
		await conn.commit();
		return 'ARCHIVED';
	} catch (err) {
		await conn.rollback();
		throw err;
	} finally {
		await conn.end();
	}
};