/**
 * function that create an ajax post action
 * - PLGNTLS_data.ajax_nonce and PLGNTLS_data.ajax_url
 *   are passed from the class PLGNTLS_class
 */

/*
// OLD VERSION
console.log("PLGNTLS_data");
console.log(PLGNTLS_data);
function PLGNTLS_ajax(action, data_obj) {
	const data = new FormData();
	data.append("action", action);
	data.append("_ajax_nonce", PLGNTLS_data.ajax_nonce);
	for (const key in data_obj)
		data.append(key, data_obj[key]);

	return fetch(PLGNTLS_data.ajax_url, {
		method: "POST",
		credentials: "same-origin",
		body: data,
	});
}
*/

// https://stackoverflow.com/q/52657814/9497573
function is_plain_object(obj)
{
	if (!obj)
		return false;
	if (obj.constructor !== Object)
		return false;
	if (Object.getPrototypeOf(obj) !== Object.prototype)
		return false;
	return true;
}

function PLGNTLS_fetch(src = null, options = null)
{
	if (src === null)
		return null;
	if (options === null)
	{
		const data = new FormData();
		data.append('action', src);
		data.append('_ajax_nonce', PLGNTLS_data.ajax_nonce);
		
		options = {
			method: 'POST',
			credentials: 'same-origin',
			body: data,
		};
	}
	else if (is_plain_object(options))
	{
		// check for method, default POST
		if (!Object.hasOwn(options, 'method'))
			options.method = 'POST';
		// check for credentials, default same-origin
		if (!Object.hasOwn(options, 'credentials'))
			options.credentials = 'same-origin';

		// check for body, default contains action and nonce
		if (!Object.hasOwn(options, 'body'))
			options.body = new FormData();
		// add action and nonce in options.body
		if (options.body instanceof FormData)
		{
			// dont check if action and nonce already exist, need new anyway
			options.body.set('action', src);
			options.body.set('_ajax_nonce', PLGNTLS_data.ajax_nonce);
		}
		else
		{
			// should think a better strategy : https://stackoverflow.com/q/20295080/9497573
		//	const data = {};
		//	if (is_plain_object(options.body))
		//	{
		//		for (const key in options.body)
		//			data[key] = options.body[key];
		//	}
		//	else
		//		data.data = options.body;
		//	data.action = src;
		//	data._ajax_nonce = PLGNTLS_data.ajax_nonce;
		//	options.body = JSON.stringify(data);

			// cannot work if fetch use :
			//   headers: {"Content-Type": "application/json"},
			const data = new FormData( );
			data.append( 'action', src );
			data.append( '_ajax_nonce', PLGNTLS_data.ajax_nonce );
			if ( is_plain_object( options.body ) )
			{
				for ( const key in options.body )
					data.append( key, JSON.stringify(options.body[key]) );
			}	
			// is string : https://stackoverflow.com/q/4059147/9497573
			else if ( typeof options.body === 'string' || options.body instanceof String )
				data.append( 'data', options.body );
			else
				data.append('data', JSON.stringify(options.body));
			options.body = data;
		}
	}
	else
		throw new Error('options not plain object or formData');

	return fetch(PLGNTLS_data.ajax_url, options);
}