/*
	GoToSocial
	Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.

	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

"use strict";

const Promise = require("bluebird");
const React = require("react");
const syncpipe = require("syncpipe");

module.exports = function useFormSubmit(form, [mutationQuery, result], { changedOnly = true } = {}) {
	const [usedAction, setUsedAction] = React.useState();
	return [
		function submitForm(e) {
			let action;
			if (e?.preventDefault) {
				e.preventDefault();
				action = e.nativeEvent.submitter.name;
			} else {
				action = e;
			}
			setUsedAction(action);
			// transform the field definitions into an object with just their values 
			let updatedFields = [];
			const mutationData = syncpipe(form, [
				(_) => Object.values(_),
				(_) => _.map((field) => {
					if (field.selectedValues != undefined) {
						let selected = field.selectedValues();
						if (!changedOnly || selected.length > 0) {
							return [field.name, selected];
						}
					} else if (!changedOnly || field.hasChanged()) {
						updatedFields.push(field);
						return [field.name, field.value];
					}
					return null;
				}),
				(_) => _.filter((value) => value != null),
				(_) => Object.fromEntries(_)
			]);

			mutationData.action = action;

			return Promise.try(() => {
				return mutationQuery(mutationData);
			}).then((res) => {
				if (res.error == undefined) {
					updatedFields.forEach((field) => {
						field.reset();
					});
				}
			});
		},
		{
			...result,
			action: usedAction
		}
	];
};