'use strict';

function ajax(url,postData) {
	let request = new XMLHttpRequest();
	let method = postData ? "POST" : "GET";
	request.open( method, url );
	if( typeof(postData)==='string' )
		request.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded" );
	request.onload = function() {
		if( request.status !== 200 ) {
			let err = 'sr_ajax failed: ' + request.status;
			if( request.responseText ) {
				err += '\n' + request.responseText;
				document.write('<pre>'+request.responseText+'</pre>');
			}
			err += '\npage = ' + window.location;
			ajax( '/error_log.js', 'err='+encodeURIComponent(err) );
			return;
		}
		try {
			//console.log(request.responseText);
			eval( request.responseText );
		} catch(e) {
			window.sr_err = '\najax-url = ' + url;
			//window.sr_err += '\n'+('ajax-response =\n' + request.responseText).trim();
			throw e;
		}
	};
	request.send(postData);
}

window.onerror = function(msg, url, line, col, error) {
	if( !url )
		return;
	let err = msg;
	err += '\nurl = ' + url;
	if( url != window.location )
		err += '\npage = ' + window.location;
	err += '\nline = '+line;
	if( col )
		err += '\ncolumn = ' + col;
	if( error ) {
		if( error.stack )
			err += '\nstack = ' + error.stack;
		if( error.cause )
			err += '\ncause= ' + error.cause;
		if( error.fileName )
			err += '\nfileName= ' + error.fileName;
	}
	if( window.err ) {
		err += window.err;
		window.err = null;
	}
	ajax( '/error_log.js', 'err='+encodeURIComponent(err) );
};

function ajaxForm(url,form) {
	let post = '';
	for( let i=0; i<form.length; i++ ) {
		let input = form[i];
		let name = input.name;
		if( name === '' )
			continue;
		let type = input.type;
		if( (type==='radio' || type==='checkbox') && !input.checked )
			continue;
		post += name + '=' + encodeURIComponent(input.value) + '&';
	}
	ajax(url,post,{form:form});
}


function showWaitingAiIcon() {
	document.querySelector('[waiting-ai-icon]').style.display = 'block';
}

const isMobile = 'ontouchstart' in window || navigator.maxTouchPoints > 0 || navigator.msMaxTouchPoints > 0;

function textareaKey(aiKey,event) {
	if( event.keyCode===13 && !event.shiftKey && !event.ctrlKey && !isMobile ) {
		event.preventDefault();
		askAi(aiKey);
	}
}

function fixTextarea(event) {
	let textarea = event.target;
	textarea.style.height = 'initial';
	textarea.style.height = (textarea.scrollHeight+2) + 'px';
	textarea.scrollIntoViewIfNeeded(false);
}

function askAi(aiKey) {
	let aiDiv = document.querySelector(`[ai_container="${aiKey}"]`);
	let input = aiDiv.querySelector('textarea');
	let url = `ai_ask.js?key=${aiKey}&input=${encodeURIComponent(input.value)}`;
	ajax(url);
	input.value = '';
	showWaitingAiIcon();
}