var tableRawSize = 5;
var annotations = [];
var algorithms = [];
var languages = [];
var publicLink = null;
var pageGreen = "#4CAF50";
var pageGray = "#A0A0A0";
var savedAnnotations = "";
var jsonContent = null;
var named = null;
var resultText = "";
var hexLetters = '0123456789ABCDEF';

// ------------------------------------------------------------------------------------------------------
// Starting point: get the csv file with algorithm parameters and set the page
// with valid algs info.
// ------------------------------------------------------------------------------------------------------

$(document).ready(function() {
	disableExecuteButton();
	$.ajax({
		url : "https://data.d4science.org/bnp4UDNyb21lSURkQXdDUnlSS0JkVWgzWk1KMUxWVGZHbWJQNStIS0N6Yz0",
		type : "GET",
		async : true,
		contentType : "text/plain; charset=utf-8",
		success : function(data, stato) {
			$("#ner-result-container").hide();
			var lineTokens = manageCsvData(data);
			getAlgorithms(lineTokens);
			buildLanguageSelection();
			buildLanguageList();
			buildAnnotations();
			resizeTable();
			resizeLogo();

			$("#back-ner-ui-button").click(function() {
				$("#ner-result-container").hide();
				$("#ner-ui").show();
				$("#input-textarea").val("");
				publicLink = null;
				jsonContent = null;
			});

			disableExecuteButton();

			$("#upload-button")
					.uploadFile(
							{
								url : "/nlphub/nlphub-uploader-servlet",
								fileName : "mytxtfile",
								maxFileCount : 100,
								multiple : false,
								maxFileSize : 1024 * 1000 * 6.14,
								showFileCounter : false,
								showCancel : true,
								dragDropStr : "<img class='img-prompt' src='img/upload.png' width='60px' height='60px' style='display:block; margin:auto; padding: 10px'>",
								extErrorStr : "Error. Text file only",
								sizeErrorStr : "Error. Max size: 6 Mb",
								onLoad : function(obj) {
									$("#file-info").remove();
									$("#reset-upload").remove();
									$("#fu-container")
											.append(
													"<div id=\"right-child\" class=\"float-right-div\"></div>");
									$("#right-child")
											.append(
													"<div id=\"file-info\" class=\"centered\"></div>");
									$("#right-child")
											.append(
													"<div id=\"reset-upload\" class=\"centered\">Cancel</div>");
									$("#reset-upload").hide();
									$("#reset-upload").click(
											function() {
												resetExecuteButton();
												$("#file-info").empty();
												$("#reset-upload").css(
														"display", "none");
												textAreaEnable(true);
											});
									savedAnnotations = "";
									setEventListeners();
								},
								onSelect : function(files) {
									showProgress();
									textAreaEnable(false);
									$("#input-textarea").val("");
								},
								onSuccess : function(files, data, xhr) {
									hideProgress();
									console.log('' + data.language);
									checkLanguage(data.language);
									selectAnnotationsByLanguage();
									$("#reset-upload").css("display",
											"inline");
									console.log("files: " + files);
									$("#file-info").empty();
									$("#file-info")
											.append(
													"Uploaded: <span style=\"color:#4CAF50; letter-spacing: 1px; font-weight: bold;\">"
															+ files
															+ "</span>");
									publicLink = data.message;
									enableExecuteButton();
									if (publicLink == null) {
										alert("Error uploading file.");
									}
								},
								onError : function(files, status, errMsg,
										pd) {
									hideProgress();
									textAreaEnable(true);
									alert(errMsg);
								}
							});
		},
		error : function(richiesta, stato, errori) {
			alert("Unexpected Error. Status: " + richiesta.status);
		}
	});
});


/*
 * Utility function processing the language indication returned by the language recognition service
 */
checkLanguage = function(lang) {
	var options = $("#language-select option");
	for(var i=0; i<options.length; i++) {
		if(options[i].innerText.toLowerCase() == lang.toLowerCase()) {
			$("#language-select").val(options[i].innerText);
			buildAnnotations();
			return;
		}
	}
	alert("The uploaded file seems to be in " + lang + ", but this language is not currently supported. Please, be aware of this, should you decide to continue and use the tools of another language... \"Praemonitus praemunitus!\"");
}

/*
 * CSV parser 
 */
manageCsvData = function(data) {
	// first of all: split on the "newline" character in order to
	// get all lines.
	var lines = data.split("\n");
	var tokens = [], lineTokens = [];

	// second: parse each line
	for (i in lines) {
		var line = ',' + lines[i];
		var tokenStart = -1;
		for (var j = 0; j < line.length; j++) {
			if (line.charAt(j) == '\"') {
				j = line.indexOf('\"', j + 1);
				if (j < 0)
					return;
				continue;
			}

			if (line.charAt(j) == ',') {
				if (tokenStart == -1) {
					tokenStart = j;
				} else {
					tokens[tokens.length] = line.substring(tokenStart + 1, j);
					tokenStart = j;
				}
			}
		}
		// get the new token and push it in the array
		tokens[tokens.length] = line.substring(tokenStart + 1);
		lineTokens[lineTokens.length] = tokens;
		tokens = [];
	}

	return lineTokens;
}

/*
 * Map the supported algorithms (from CSV) in the internal global algorithm array
 */
getAlgorithms = function(lineTokens) {
	// build the list of supported algorithms
	for (i = 0; i < lineTokens.length; i++) {
		if ((i == 0) || (lineTokens[i].length != 8))
			continue; // skip the header
		if (lineTokens[i][7].trim().toUpperCase() == "OK") {
			var algName = lineTokens[i][0].trim();
			var algDescription = lineTokens[i][1].trim();
			var algId = lineTokens[i][2].trim();
			var annotationList = lineTokens[i][3].replace(/"/g, " ").trim();
			var language = lineTokens[i][4].replace(/"/g, " ").trim();

			algorithms[algorithms.length] = {
				"name" : algName,
				"description" : algDescription,
				"id" : algId,
				"lang" : language,
				"annotations" : annotationList
			};
		}
	}
}

/*
 * Build the annotation list based on the language selected
 */
buildAnnotations = function() {
	annotations = [];
	var language = $("#language-select").val();
	for (i in algorithms) {
		if (algorithms[i].lang.toLowerCase() != language.toLowerCase())
			continue;
		var annotationList = algorithms[i].annotations;
		var a = annotationList.split(/\s|,/);
		for (j in a) {
			a[j] = a[j].trim();
			if (a[j].length > 0) {
				var thereIs = false;
				for (k in annotations) {
					if (annotations[k].toUpperCase() == a[j].toUpperCase()) {
						thereIs = true;
						break;
					}
				}
				if (!thereIs)
					annotations[annotations.length] = a[j];
			}
		}
	}
}

/*
 * Build the language array
 */
buildLanguageSelection = function() {
	for (i in algorithms) {
		var languageList = algorithms[i].lang;
		var langs = languageList.split(/\s|,/);
		for (j in langs) {
			langs[j] = langs[j].trim();
			if (langs[j].length > 0) {
				var thereIs = false;
				for (k in languages) {
					if (languages[k].toUpperCase() == langs[j].toUpperCase()) {
						thereIs = true;
						break;
					}
				}
				if (!thereIs)
					languages[languages.length] = langs[j];
			}
		}
	}
}

enableExecuteButton = function() {
	$("#execute-button").css("background-color", pageGreen);
	$("#execute-button").attr("enable", "true");
}

disableExecuteButton = function() {
	$("#execute-button").css("background-color", pageGray);
	$("#execute-button").attr("enable", "false");
}

isEnabled = function() {
	if($("#execute-button").attr("enable") == "true")
		return true;
	return false;
}

enableDisableTextArea = function() {
	if ($("#input-textarea").val() == "")
		disableExecuteButton();
	else
		enableExecuteButton();
}

/*
 * Set the listeners on the text area and the execute button
 */
setEventListeners = function() {
	$("#input-textarea").on("keyup", function() {
		enableDisableTextArea();
	});
	
	$("#input-textarea").change(function() {
		enableDisableTextArea();
	});

	window.addEventListener('contextmenu', function(e) {
        //alert("You've tried to open context menu"); //here you draw your own menu
        //e.preventDefault();
		enableDisableTextArea();
    }, false);
	
	$("#execute-button")
			.click(
					function() {
						if(!isEnabled())
							return;
						
						if ((publicLink == null)
								&& ($("#input-textarea").val() == "")) {
							alert("You must upload a file or write some text in the text area before submit a request.");
							return;
						}

						disableExecuteButton();
						
						showProgress();
						// if some text has been written in the text area, then
						// a corresponding text file
						// must be written in the workspace and the public link
						// is set.
						if ($("#input-textarea").val().length > 0) {
							freeText = $("#input-textarea").val();
							$
									.ajax({
										url : "/nlphub/nlphub-uploader-servlet?freetext="
												+ encodeURI(freeText),
										type : "POST",
										async : true,
										contentType : "text/plain; charset=utf-8",
										success : function(data, stato) {
											publicLink = data.message;
											if (publicLink == null) {
												alert("Error uploading file.");
											}
											launchAlgorithm();
										},
										error : function(richiesta, stato,
												errori) {
											alert("Unexpected Error. Status: "
													+ richiesta.status);
											hideProgress();
											textAreaEnable(true);
											$("#file-info").empty();
										}
									});
						}

						else {
							launchAlgorithm();
						}
					});
}

/*
 * show the in-progress popup
 */
showProgress = function() {
	var width = $(".progress-circular-div").width();
	var height = $(".progress-circular-div").height();
	var left = parseInt((window.innerWidth - width) / 2);
	var top = parseInt((window.innerHeight - height) / 2);
	$(".progress-circular-div").css("left", left);
	$(".progress-circular-div").css("top", top);
	$(".hidden-div").css("display", "block");
}

/*
 * hide the in-progress popup
 */
hideProgress = function() {
	$(".hidden-div").css("display", "none");
}

/*
 * run the algorithms selected by the chosen language
 */
launchAlgorithm = function() {
	if (publicLink == null) {
		alert("No input text available for the service.");
		return;
	}
	var list = buildInputAnnotationList();
	var annList = "";
	for (i in list) {
		annList += list[i] + ",";
	}
	annList = annList.substring(0, annList.length - 1);
	savedAnnotations = annList;

	var algList = "";
	for (j in algorithms) {
		if (algorithms[j].lang.toLowerCase().indexOf(
				$("#language-select").val().toLowerCase()) >= 0) {
			algList += encodeURI(algorithms[j].id) + ",";
		}
	}
	if (algList.length == 0) {
		alert("Warning. No algorithm matching with selected language.");
		return;
	}
	algList = algList.substring(0, algList.length - 1);

	var parameters = "annotations=" + annList;
	parameters += "&lang=" + $("#language-select").val();
	parameters += "&plink=" + encodeURI(publicLink);
	parameters += "&algs=" + algList;

	$.ajax({
		url : "/nlphub/nlphub-servlet?" + parameters,
		type : "POST",
		async : true,
		success : function(data, stato) {
			textAreaEnable(true);
			$("#file-info").empty();
			$("#reset-upload").css("display", "none");
			if (typeof (data.response) != 'undefined') {
				var jsonOut = getOutputJson(data.message);
			} else if (typeof (data.error) != 'undefined') {
				hideProgress();
				alert(data.message);
			} else {
				hideProgress();
				alert("Unexpected response");
			}
			resetExecuteButton();
		},
		error : function(richiesta, stato, errori) {
			hideProgress();
			textAreaEnable(true);
			alert("Unexpected Error. Status: " + richiesta.status);
			resetExecuteButton();
		}
	});
}

/*
 * Get the final json returned by the server
 */
getOutputJson = function(message) {
	var tobemap = "";
	for (var i = 0; i < message.length; i++) {
		tobemap += message[i] + "|";
	}

	tobemap = tobemap.substring(0, tobemap.length - 1);

	var parameters = "annotations=" + savedAnnotations;
	parameters += "&plink=" + encodeURI(publicLink);
	parameters += "&lang=" + $("#language-select").val();
	parameters += "&tobemap=" + encodeURI(tobemap);
	console.log(parameters);

	$.ajax({
		url : "/nlphub/nlphub-mapper-servlet?" + parameters,
		type : "POST",
		async : true,
		success : function(data, stato) {
			hideProgress();
			console.log(data);
			if ((typeof (data.response) != "undefined")
					&& (data.response.trim().toUpperCase() == "ERROR")) {
				alert("ERROR\n" + data.message);
			} else {
				$("#reset-upload").hide();
				savedAnnotations = "";
				publicLink = null;
				showResult(data);
			}
		},
		error : function(richiesta, stato, errori) {
			hideProgress();
			$("#reset-upload").hide();
			savedAnnotations = "";
			publicLink = null;
			alert("Unexpected Error. Status: " + richiesta.status);
		}
	});
}

/*
 * Show the computation result 
 */
showResult = function(data) {
	$("#ner-ui").hide();
	$("#ner-result-container").show();

	jsonContent = data;
	resultText = jsonContent.output.text;

	$("#result-header-left").empty();
	$("#result-header-right").empty();
	$("#result-params-div").empty();
	$("#result-text-div").empty();

	$("#result-header-left").append(
			"You can download the overall result as a JSON file <a href='"
					+ jsonContent.link + "'>here</a>");
	$("#result-header-right").append("&nbsp;");
	var localText = resultText;
	localText = resultText.replace(/\n/g, "<br>");
	$("#result-text-div").empty();
	$("#result-text-div").append("<p>" + localText + "</p>");

	showAnnotationList(jsonContent.output.annotations);
}

showAnnotationList = function(list) {
	var colorDisabled = "CCCCCC";
	var color;
	var colors = [];
	var annotations = list.split(",");
	for (var i = 0; i < annotations.length; i++) {
		do {
			color = randomRGB();
		} while (color == colorDisabled);
		colors[colors.length] = color;
	}

	$("#result-params-div").append("<form id='colored-annotations'></form>");
	for (var i = 0; i < annotations.length; i++) {
		var cb = "<input type='radio' name='foo' ";
		if (!checkAnnotation(annotations[i])) {
			cb += "disabled ";
			colors[i] = colorDisabled;
		}
		cb += "named='" + annotations[i] + "' value='" + colors[i]
				+ "' id='color-" + i + "' class='filled-in'>";
		cb += "<label for='color-" + i
				+ "'><span style='font-weight:bold; color:#" + colors[i] + "'>"
				+ annotations[i] + "</span></label><br>";
		$("#colored-annotations").append(cb);
	}
	$("#colored-annotations :radio").change(function() {
		if (this.checked) {
			rewriteText(this.getAttribute("named"), "#" + this.value);
		}
	});
}

/*
 * Utility function 
 */
countSubstringOccurrencies = function(string, substring) {
	var occurrencies = 0;
	var index = 0;
	var s = string;
	while (index >= 0) {
		index = s.indexOf(substring);
		if (index >= 0) {
			occurrencies++;
			s = s.substring(index + 1);
		}
	}
	return occurrencies;
}


/*
 * Utility
 */

enhanceColor = function(color) {
	var c = eval("0x" + color);
	var hi = Math.round(c / 16);
	if(hi < 15) {
		hi += Math.round((15 - hi) / 1.5);
	}
	if(hi > 15) hi = 15;
	return '' + hexLetters[hi] + hexLetters[c%16];
}

/*
 * Write the html paragraph <p> containing the text highlighted on annotation value
 */
rewriteText = function(annotation, color) {
	$("#result-text-div").empty();

	var complemetar = 0xFFFFFF - eval("0x" + color.substring(1));
	var complement = complemetar.toString(16);
	var R = enhanceColor(complement.substring(0,2));
	var G = enhanceColor(complement.substring(2,4));
	var B = enhanceColor(complement.substring(4));
	complement = "#" + R + G + B;
	
	var indices = getIndices(annotation);
	$("#result-header-right").empty();
	$("#result-header-right").append("<span style='color:" + color + ";'>" + annotation + "</span> occurs " + indices.length + " times.");
	var indexedText = "";

	if ((typeof (indices) == 'undefined') || (indices.length == 0)) {
		indexedText = resultText;
		indexedText = indexedText.replace(/\n/g, "<br>");
		$("#result-text-div").append("<p>" + indexedText + "</p>");
		return;
	}

	var t = 0;
	var offset = 0;
	for (var i = 0; i < indices.length; i++) {
		var index = indices[i];
		var start = index[0];
		var end = index[1];
		indexedText += resultText.substring(t, start);
		offset += countSubstringOccurrencies(resultText.substring(t, start),
				"\n");
		offset += countSubstringOccurrencies(resultText.substring(t, start),
				"\r");
		offset += countSubstringOccurrencies(resultText.substring(t, start),
				"\t");
		start += offset;
		end += offset;
		var colored = "<span style='color:" + color + "; background:"
				+ complement + "; font-weight:bold;'>"
				+ resultText.substring(start, end) + "</span>";
		indexedText += colored;
		t = end;
	}
	if (t < resultText.length)
		indexedText += resultText.substring(t);

	indexedText = indexedText.replace(/\n/g, "<br>");
	$("#result-text-div").append("<p>" + indexedText + "</p>");
}

/*
 * Find if the annotation is presente in the json 
 */
checkAnnotation = function(annotation) {
	for (var i = 0; i < jsonContent.output.result.length; i++) {
		var entities = jsonContent.output.result[i].entities;
		for (var j = 0; j < entities.length; j++) {
			a = entities[j][annotation];
			if (typeof a != 'undefined') {
				return true;
			}
		}
	}
	return false;
}

/*
 * Retrieve the annotation indices from the json
 */
getIndices = function(annotation) {
	var indices = [];
	// get indices
	for (var i = 0; i < jsonContent.output.result.length; i++) {
		var entities = jsonContent.output.result[i].entities;
		for (var j = 0; j < entities.length; j++) {
			a = entities[j][annotation];
			if (typeof a != 'undefined') {
				indices[i] = [];
				for (var k = 0; k < a.length; k++) {
					var index = a[k].indices;
					indices[i][k] = index;
				}
			}
		}
	}

	var indices2 = [];
	for (var i = 0; i < indices.length; i++) {
		if (typeof (indices[i]) != 'undefined')
			indices2[indices2.length] = indices[i];
	}

	return mergeIndices(indices2);
}

/*
 * Merge the indices
 */
mergeIndices = function(indices) {
	var newIndices = []
	if (indices.length <= 1)
		newIndices = indices[0];
	else
		newIndices = mergeAll(indices);
	return newIndices;
}

/*
 * Utility function
 */
resetExecuteButton = function() {
	publicLink = null;
	disableExecuteButton();
}

/*
 * Resize the annotation table based on the screen geometry
 */
resizeTable = function() {
	// resize the annotation table
	$("#annotations-table").empty();
	var rowId = "";
	var ratio = window.innerWidth / window.innerHeight;

	if (ratio <= 0.35) {
		tableRawSize = 1;
	} else if ((ratio > 0.35) && (ratio <= 0.75)) {
		tableRawSize = 2;
	} else if ((ratio > 0.75) && (ratio <= 1)) {
		tableRawSize = 3;
	} else if ((ratio > 1) && (ratio <= 1.5)) {
		tableRawSize = 4;
	} else {
		tableRawSize = 5;
	}

	for (var i = 0; i < annotations.length; i++) {
		if (i % tableRawSize == 0) {
			rowId = "row-" + i;
			$("#annotations-table").append("<tr id=\"" + rowId + "\"></tr>");
		}
		var annotationElement = "<input type=\"checkbox\" id=\"check-" + i
				+ "\" value=\"" + annotations[i]
				+ "\" checked=\"checked\"></input> <label for=\"check-" + i
				+ "\">" + annotations[i] + "</label>";
		$("#" + rowId).append("<td>" + annotationElement + "</td>");
	}
}

/*
 * Resize the page logo image based on the screen geometry
 */
resizeLogo = function() {
	if (window.innerWidth < 200)
		$("#logo-image").width(window.innerWidth - 10);
}

/*
 * Build the annotation list for the service invocation
 */
buildInputAnnotationList = function() {
	var list = [];
	for (var i = 0; i < annotations.length; i++) {
		if ($("#check-" + i).is(":Checked"))
			list[list.length] = $("#check-" + i).val();
	}
	return list;
}

/*
 * Handler for the window resize event
 */
window.onresize = function(event) {
	resizeTable();
	resizeLogo();
};

/*
 * Handler for the file upload control
 */
$(".ajax-file-upload-abort").on("DOMAttrModified", function(event) {
	$(".ajax-file-upload-abort").css("display", "none");
	if (event.attributeName == "display") { // which attribute you want to watch
											// for changes
		$(".ajax-file-upload-abort").css("display", "none");
	}
});

/*
 * Build the option list of supported language
 */
buildLanguageList = function() {
	// build the language selection input control
	for (i in languages) {
		var opt = "<option value=\"" + languages[i]
				+ "\" selected=\"selected\">" + languages[i] + "</option>";
		if (i > 1)
			opt = "<option value=\"" + languages[i] + "\">" + languages[i]
					+ "</option>";
		$("#language-select").append(opt);
	}
	$("#language-select").on("change", function() {
		selectAnnotationsByLanguage();
	});
}

/*
 * Utility
 */
selectAnnotationsByLanguage = function() {
	buildAnnotations();
	resizeTable();
}

/*
 * Enable/disable the input text area
 */
textAreaEnable = function(enable) {
	if (enable == true)
		$("#input-textarea").prop('disabled', false);
	else
		$("#input-textarea").prop('disabled', true);
}

/*
 * Get a random RGB color
 */
randomRGB = function() {
	var color = '';
	var couple = '';
	for (var i = 0; i < 3; i++) {
		couple = '' + hexLetters[Math.floor(Math.random() * 10)] + hexLetters[Math.floor(Math.random() * 16)];
		color += couple;
	}

	return color;
}