/*
* overriding the datepicker function to intercept the arguments
* -> https://stackoverflow.com/questions/26667720/how-to-get-the-selected-date-from-jquery-datepicker
* then create an false input that will mask the real one
* and put the original date format on the false element,
*   while transforming the real one with the acf format 'Ymd'
* 
* another solution would be to find the elements with the datepicker, and add the onSelect here
*
*/
// store the original jQuery UI datepicker function
const original_datepicker = jQuery.fn.datepicker;
// override the datepicker function
jQuery.fn.datepicker = function(options) {
	/*
	* first creates the fake input
	*
	*/
	create_fake_date_input(options, this);


	/*
	* then override the options to add action on select date :
	* -> store the date in acf format in the hidden field value
	*
	*/
	options.onSelect = function(date_text, inst) {
		const acf_date_format = "yymmdd";
		const selected_date = jQuery(this).datepicker('getDate');
		const formated_date = jQuery.datepicker.formatDate(acf_date_format, selected_date);

		const fake_id = 'acf_date_fake_' + inst.id;
		jQuery('#' + fake_id).val(date_text);
		jQuery(this).val(formated_date);
	}

	// call the original datepicker function with the updated option
	return original_datepicker.call(this, options);
};




/*
* creates the false element
* place it above the real one to hide it
*
*/
async function create_fake_date_input(options, element) {
	const fake_id = 'acf_date_fake_' + element.attr('id');
	if (jQuery('#' + fake_id).length !== 0) {
		return;
	}


	const fake_name = 'acf_date_fake_for_' + element.attr('name');
	const original_date_string = await get_acf_date_from_rest(element);
	const fake_value = original_date_string;


	/*
	* we position the hidden element right in top of the real datepicker one
	* it might nor work in some situation, but so far it's good
	* then we remove pointer events, so that clicking on it actually clicks on the real input
	*
	*/
	let fake_style = `
		position: absolute;
		top: 0px;
		left: 0px;
		pointer-events: none;
	`;
	const font_weight = element.css('font-weight');
	if (font_weight) {
		fake_style += `font-weight: ${font_weight};`;
	}


	/*
	* gives the parent element a defined position if needed
	* then create the false input above the real one
	*
	*/
	if (element.parent().css('position') === 'static') {
		element.parent().css('position', 'relative');
	}
	jQuery(`<input type="text" id="${fake_id}" name="${fake_name}" style="${fake_style}" value="${fake_value}">`).insertAfter(element);
}




/*
* use the rest api to get the formated value for the date field
*
*/
async function get_acf_date_from_rest(element) {
	const pid = getUrlParameter('pid');

	const prefix = "de_fb_";
	const name = element.attr('name')
	let acf_name = name.substring(prefix.length);

	let date = element.val(); // default date, not formated, if fetch call fails
	let fetch_data = null;

	try {
		const response = await fetch(`/wp-json/wp/v2/posts/${pid}?_fields=acf.${acf_name}&acf_format=standard`);
		fetch_data = await response.json();
		tmp_date = fetch_data.acf[acf_name];
		if (tmp_date) {
			date = tmp_date;
		}
	}
	catch (error) {
		console.error('Error fetching ACF field:', error);
	}

	return date;
}




/*
* https://stackoverflow.com/a/21903119/9497573
*
*/
function getUrlParameter(sParam) {
	let sPageURL = window.location.search.substring(1),
			sURLVariables = sPageURL.split('&'),
			sParameterName,
			i;

	for (i = 0; i < sURLVariables.length; i++) {
		sParameterName = sURLVariables[i].split('=');

		if (sParameterName[0] === sParam) {
			return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]);
		}
	}
	return false;
};