// Imixs-Office Autocomplete Script
//
// Used for a generic autocomplete and suggest feature for input fields

IMIXS.namespace("org.imixs.workflow.office.autocomplete");

var autocompleteInputID;
var autcompleteSelectedElement;
var autocompleteSearchReady=false;
var currentSelectCallback;

/**
 * This onLoad method initializes the suggest inputs
 */
$(document).ready(function() {
	/*var suggestInputList=$(".office-suggestinput-inputtext");
	$(suggestInputList).each(function(index) {
		suggestInputInit(this.id);
	});  */
});


/* Helper method to select the current element in the result list */
function selectActiveElement(inputElement) {
	var id=$(inputElement).data('resultlist');
	var parent=$( "div[id$='" + id +"']" );
	var resultElementListActive = $(".autocomplete-resultlist-element.active",parent);
	$("a",resultElementListActive).click();
	$(parent).hide();
}

/* Helper method to highligt the current element in the result list */
function autocompleteSelectNextElement(inputElement) {
	var id=$(inputElement).data('resultlist');
	var parent=$( "div[id$='" + id +"']" );
	var resultElementList = $(".autocomplete-resultlist-element",parent);
	
	if (autcompleteSelectedElement == undefined) {
		autcompleteSelectedElement =-1;
	}
	// remove acitve if set	
	$(resultElementList).removeClass("active");
	// next element...?
	autcompleteSelectedElement++;
	if (autcompleteSelectedElement >= resultElementList.length) {
		// reset if overflow...
		autcompleteSelectedElement = 0;
	} 
	// set new active
	$(resultElementList[autcompleteSelectedElement]).addClass("active");
}

function autocompleteSelectPrevElement(inputElement) {
	var id=$(inputElement).data('resultlist');
	var parent=$( "div[id$='" + id +"']" );
	var resultElementList = $(".autocomplete-resultlist-element",parent);
	
	if (autcompleteSelectedElement == undefined ) {
		autcompleteSelectedElement =-1;
	}
	// remove acitve if set	
	$(resultElementList).removeClass("active");
	autcompleteSelectedElement--;
	// next element...?
	if (autcompleteSelectedElement < 0) {
		autcompleteSelectedElement = resultElementList.length - 1;
	}
	// set new active
	$(resultElementList[autcompleteSelectedElement]).addClass("active");
}


/**
 * This mehtod shows the search result panel and places it below the current input element
 */
function autocompleteShowResult(data) {
	autcompleteSelectedElement = -1;
	var status = data.status;
	if (status === "success") {
		// select the inital input element by its name...
		var inputElement = $('input[name ="' + autocompleteInputID + '"]')
		// now we pull the result html list to this input field.....
		$("[id$=" +  inputElement.data('resultlist')  + "]").insertAfter(inputElement).show();
	}
}


function autocompleteSelectElement(text) {
	// select the inital input element by its name...
	var inputField = $('input[name ="' + autocompleteInputID + '"]')
	inputField.val(text);
	if (currentSelectCallback) {
		currentSelectCallback(text,inputField);
	}
}


/*
 * initializes an input element for autocompletion. 
 * the param 'resultlistid' is optional and defines the element 
 * containing the search result.
 * The callback method is optional and triggered when a new element was selected 
 * from the suggest list
 */
function autocompleteInitInput(inputElement,searchCallback, resultlistId, selectCallback) {
	
	// set id for result list element
	if (!resultlistId || resultlistId==='') {
		resultlistId='autocomplete-resultlist'; // default name
	} 
	$(inputElement).attr('data-resultlist', resultlistId);
	
	// add a input event handler with delay to serach for suggestions....
	$(inputElement).on('input', delay(function() {
		if (!autocompleteSearchReady) {
			return; // start only after first key down! (see below)
		}
		// store the current input id
		autocompleteInputID = inputElement.name;
		currentSelectCallback=selectCallback;
		searchCallback({ phrase: this.value });
	}, 500)).trigger('input');


	// hide the suggest list on blur event
	$(inputElement).on("blur", delay(function(event) {
		$("[id$=" + $(this).data('resultlist')  + "]").hide();
	}, 200));


	/*execute a function presses a key on the keyboard:*/
	$(inputElement).keydown(function(e) {
		autocompleteSearchReady=true; // init serach mode
		if (e.keyCode == 40) {
	        /*If the arrow DOWN key is pressed,
	        increase the currentFocus variable:*/
			autocompleteSelectNextElement(this);
		} else if (e.keyCode == 38) { //up
	        /*If the arrow UP key is pressed,
	        decrease the currentFocus variable:*/
			autocompleteSelectPrevElement(this);
		} else if (e.keyCode == 13) {
			/*If the ENTER key is pressed, prevent the form from being submitted,*/
			e.preventDefault();
			selectActiveElement(this);			
		}
	});

	// turn autocomplete of
	$(inputElement).attr('autocomplete', 'off');
}




/*
 * Init Suggest Input function
 * The method expect the id of a suggest input element
 * and registers key down events to control the resultlist by keys
 * The resultlist is the next div after the input
 
 * The method makes use of the 'autocomplet' functions as the suggestInput has
 * the same dom tree structure 
 * 
 * The callback method is optional and is called before the init code!
 */
function suggestInputInit(inputElementID) {
	var iObj=document.getElementById(inputElementID);
	var inputElement=$(iObj);
	// find the resultlist element
	var resultlist=$(inputElement).next()[0];
	var resultlistId=$(resultlist)[0].id;
	if (!resultlistId || resultlistId==='') {
		resultlistId='suggest-resultlist'; // default name
	} 
	$(inputElement).attr('data-resultlist', resultlistId);
	
	
	/* execute a function presses a key on the keyboard */
	$(inputElement).keydown(function(e) {
		autocompleteSearchReady=true; // init serach mode
		if (e.keyCode == 40) {
	        /*If the arrow DOWN key is pressed,
	        increase the currentFocus variable:*/
			autocompleteSelectNextElement(this);
		} else if (e.keyCode == 38) { //up
	        /*If the arrow UP key is pressed,
	        decrease the currentFocus variable:*/
			autocompleteSelectPrevElement(this);
		} else if (e.keyCode == 13) {
			/*If the ENTER key is pressed, prevent the form from being submitted,*/
			e.preventDefault();
			selectActiveElement(this);			
		}
	});
	
		
	// on blur hide the suggestinput-resultlist
	$(inputElement).on("blur", delay(function(event) {
		$(".suggestinput-resultlist").hide();
	}, 200));
		 
}

/*
 * This helper method highligts a element in the 
 * suggest result list if possible.
 * The method is called by the f:ajax of the suggest_input
 */
function highlightResultList(data) {
	var inputElement=$(data.source);
	var resultlistId=$(inputElement).attr('data-resultlist');
	
	// set active if possible
	if (autcompleteSelectedElement == undefined) {
		autcompleteSelectedElement =-1;
	} else {
		var parent=$( "div[id$='" + resultlistId +"']" );
		var resultElementList = $(".autocomplete-resultlist-element",parent);
		// remove acitve if set	
		$(resultElementList).removeClass("active");
		if (autcompleteSelectedElement >= resultElementList.length) {
			// reset if overflow...
			autcompleteSelectedElement = -1;
		} else {
			// set active
			$(resultElementList[autcompleteSelectedElement]).addClass("active");
		}
	}
}

/*
 * delay function
 * see: https://stackoverflow.com/questions/1909441/how-to-delay-the-keyup-handler-until-the-user-stops-typing
 */
function delay(callback, ms) {
	var timer = 0;
	return function() {
		var context = this, args = arguments;
		clearTimeout(timer);
		timer = setTimeout(function() {
			callback.apply(context, args);
		}, ms || 0);
	};
}

// Define public namespace
var imixsOfficeAutocomplete = IMIXS.org.imixs.workflow.office.autocomplete;