util.mjs

/**
 * Copyright 2023 schukai GmbH
 * SPDX-License-Identifier: AGPL-3.0
 */

import {diff} from "../../data/diff.mjs";
import { Pathfinder } from "../../data/pathfinder.mjs";
import { isObject } from "../../types/is.mjs";
import { Observer } from "../../types/observer.mjs";

export { handleDataSourceChanges, datasourceLinkedElementSymbol };

/**
 * @private
 * @type {symbol}
 */
const datasourceLinkedElementSymbol = Symbol("datasourceLinkedElement");

/**
 * @private
 */
function handleDataSourceChanges() {

	if (!this[datasourceLinkedElementSymbol]) {
		return;
	} 

	let data = this[datasourceLinkedElementSymbol].data;

	const actualData = JSON.stringify(this.getOption("data"));
	const actualDataAsObj = JSON.parse(actualData);

	const path = this.getOption("mapping.data");
	if (path) {
		data = new Pathfinder(data).getVia(path);
	}

	if (isObject(data)) {
		const tmp = [];
		const keys = Object.keys(data);
		for (const key of keys) {
			tmp.push(data[key]);
		}
		data = tmp;
	}

	const index = this.getOption("mapping.index");
	if (index !== undefined && index !== null) {
		data = data?.[index];
	}

	if (data === undefined|| data === null) {
		data = [];
	}
	
	const result = diff(data,actualDataAsObj);
	if (result.length === 0) {
		return;
	}
	
	setTimeout(() => {
		this.setOption("data", data);
	}, 0);
}