String.prototype.trim=function(){
    return this.replace(/^\s*|\s*$/g,'');
}

WEBNAME_HIDDEN_ID = "schoolWebName"
SUBJECTID_HIDDEN_ID = "subjectID"
COURSE_HIDDEN_ID = "courseNumber"
TYPE_HIDDEN_ID = "type"
LEFT_SHOW = "auto"
LEFT_HIDE = "-999em"

USC_FOOTBALL_SUBJECT_ID = 611
USC_FOOTBALL_HTML = "<div class='football-img'>&nbsp;</div>"

LOADING_HTML = "<div class='loading'><img src='/images/loading.gif'/></div>"

var loadingSchool = false
//loadingSubject = false
var waitingToSubmit = false		// If we are waiting to submit the form, this will be
							// set to the form object.

subjectsHTML = new Array()
coursesHTML = new Array()

// Get the schools array from PHP. The format for the schools array is:
//
//		schools[schoolID] = new Array()
//		schools[schoolID] = [synonym1, synonym2,...]
//
// For example, for ucla, it might be:
//
//		schools[1] = ["ucla","uclosangeles","universityofcalifornialosangeles"]

schoolSynonyms = new Array()
schoolSynonyms['ucla'] = ['ucla', 'uc los angeles', 'uc at los angeles', 'university of california la', 'university of california los angeles', 'UCLA','ucla']
schoolSynonyms['stanford'] = ['stanford', 'Stanford','stanford']
schoolSynonyms['berkeley'] = ['berkeley', 'uc berkeley', 'ucb', 'university of california, berkeley', 'university of california berkeley', 'university of california at berkeley', 'uc at berkeley', 'cal', 'UC Berkeley','berkeley']
schoolSynonyms['ucsd'] = ['ucsd', 'uc san diego', 'university of california at san diego', 'UC San Diego','ucsd']
schoolSynonyms['uci'] = ['uci', 'uc irvine', 'university of california irvine', 'university of california at irvine', 'uc at irvine', 'UC Irvine','uci']
schoolSynonyms['harvard'] = ['Harvard','harvard']
schoolSynonyms['usc'] = ['usc', 'university of southern california', 'university of sucky california', 'u of southern california', 'USC','usc']
schoolSynonyms['mit'] = ['MIT','mit']
schoolSynonyms['caltech'] = ['caltech', 'california institute of technology', 'california institute technology', 'california institute tech', 'california institute of tech', 'Caltech','caltech']
schoolSynonyms['dartmouth'] = ['Dartmouth','dartmouth']
schoolSynonyms['rice'] = ['Rice','rice']
schoolSynonyms['duke'] = ['Duke','duke']
schoolSynonyms['wisc'] = ['UW Madison','wisc']
schoolSynonyms['uiuc'] = ['UI Urbana\-Champaign', 'UI Urbana Champaign','uiuc']
schoolSynonyms['colorado'] = ['UC Boulder','colorado']
schoolSynonyms['ucdavis'] = ['UC Davis','ucdavis']
schoolSynonyms['ucsb'] = ['UC Santa Barbara','ucsb']
schoolSynonyms['ucr'] = ['UC Riverside','ucr']
schoolSynonyms['ucsc'] = ['UC Santa Cruz','ucsc']
schoolSynonyms['upenn'] = ['U Penn','upenn']
schoolSynonyms['princeton'] = ['Princeton','princeton']
schoolSynonyms['jhu'] = ['Johns Hopkins','jhu']
schoolSynonyms['brown'] = ['Brown','brown']
schoolSynonyms['vanderbilt'] = ['Vanderbilt','vanderbilt']
schoolSynonyms['asu'] = ['Arizona State','asu']
schoolSynonyms['columbia'] = ['Columbia','columbia']
schoolSynonyms['yale'] = ['Yale','yale']
schoolSynonyms['wfu'] = ['Wake Forest','wfu']
schoolSynonyms['bu'] = ['Boston University','bu']

subjectSynonyms = new Array()
courseList = new Array()

highlight_backgroundImage = "../images/topbarbg.gif"

previousSchool = null
previousSubject = null
previousCourse = null
previousCourseLink = null
previousType = null
previousCourseNumber = null

// http://earthcode.com/blog/2006/01/optional_args.html
function augment (oSelf, oOther) {
    if (oSelf == null) {
        oSelf = {};
    }
    for (var i = 1; i < arguments.length; i++) {
        var o = arguments[i];
        if (typeof(o) != 'undefined' && o != null) {
            for (var j in o) {
                oSelf[j] = o[j];
            }
        }
    }
    return oSelf;
}

function byId(id)
{
	try {
		return document.getElementById(id)
	}
	catch(e) {
		return null
	}
}

function toggle(obj)
{
	if(obj.style.display == "none" || obj.style.display == "")
	{
		show(obj)
	}
	else
	{
		hide(obj)
	}
}

function show(obj)
{
	if(obj) showBlock(obj)
}

function showBlock(obj)
{
	if(obj) obj.style.display = "block"
}

function showInline(obj)
{
	if(obj) obj.style.display = "inline"
}

function hide(obj)
{
	if(obj) obj.style.display = "none"
}

function wipeHTML(obj) {
	obj.innerHTML = " "
}

function checkAndSubmit(form) {
	if(loadingSchool) {
		waitingToSubmit = form
		return false
	}
	else {
		reparseQuery()
		return true
	}
}

function recordClick(destURL)
{
//	alert("recordClick: " + destURL)
	hiddenIframe = document.getElementById("hiddenIframe")
//	alert(hiddenIframe)
	if(hiddenIframe)
	{
//		alert("scripts/recordClick.php?sourceURL=" + location + "&destURL=" + destURL)
		hiddenIframe.src = "scripts/recordClick.php?sourceURL=" + location + "&destURL=" + destURL
	}
}

function loadSchool(schoolWebName, optional) {
	var optional = augment({
		loadHTML : true
	}, optional)
	
	if (!byId(WEBNAME_HIDDEN_ID)) return;
	byId(WEBNAME_HIDDEN_ID).value = schoolWebName
	schoolObj = byId("school_" + schoolWebName)
	if(!schoolObj) {
		byId("courses").innerHTML = "&nbsp;"
		byId("subjects").innerHTML = "&nbsp;"
		if(previousSchool) {
			unHighlight(previousSchool)
		}
		previousSchool = null
		return
	}
	
	// Set school cookie
	document.cookie = "schoolWebName=" + schoolWebName
	
	if(schoolObj == previousSchool) {
		return
	}
	
	if(previousSchool) {
		unHighlight(previousSchool)
	}
	
	highlight(schoolObj)
	
	previousSchool = schoolObj
	
	// clear courses any subject synonyms
	
	if(optional.loadHTML) {
		showLoading("subjects")
		byId("courses").innerHTML = "&nbsp;"
		subjectSynonyms = new Array()
		courseList = new Array()
		if(subjectsHTML["school_" + schoolWebName]) {
			byId("subjects").innerHTML = subjectsHTML["school_" + schoolWebName]
			xmlDoc = getXMLDoc(subjectsHTML["school_" + schoolWebName])
			updateSynonyms(xmlDoc.getElementsByTagName("synonymsList").item(0))
			highlight(schoolObj)	// To override loading animation on mini search bar
		}
		else {
			loadingSchool = true
			xobj = getXMLHttp()
			xobj.onreadystatechange = function() {
				if(xobj.readyState == 4) {
					byId("subjects").innerHTML = xobj.responseText
					subjectsHTML["school_" + schoolWebName] = xobj.responseText
					xmlDoc = getXMLDoc(xobj.responseText)
					updateSynonyms(xmlDoc.getElementsByTagName("synonymsList").item(0))
					reparseQuery()
					loadingSchool = false
					highlight(schoolObj)	// To override loading animation on mini search bar
					if(waitingToSubmit) {
						reparseQuery()
						waitingToSubmit.submit()
					}
				}
			}
			xobj.open("GET", "/subjects.php?schoolWebName=" + schoolWebName, true)
			xobj.send(null)
		}
	}
}

function updateSynonyms(synonymsListObj) {
	synonymsTags = synonymsListObj.getElementsByTagName("synonyms")
	for(var i = 0; i < synonymsTags.length; i++) {
		synonyms = synonymsTags.item(i)
		subjectSynonyms[synonyms.getAttribute("subjectID")] = synonyms.getAttribute("synonyms").split(",")
	}
}

function loadSubject(subjectID, optional) {
	var optional = augment({
		loadHTML : true
	}, optional)
	
	if (!byId(SUBJECTID_HIDDEN_ID)) return;
	byId(SUBJECTID_HIDDEN_ID).value = subjectID
	subjectObj = byId("subject_" + subjectID)
	if(!subjectObj) {
		byId("courses").innerHTML = "&nbsp;"
		if(previousSubject) {
			unHighlight(previousSubject)
		}
		previousSubject = null
		return
	}
	
	if(subjectObj == previousSubject) {
		return
	}
	
	if(previousSubject) {
		unHighlight(previousSubject)
	}
	
	highlight(subjectObj)
	previousSubject = subjectObj
	
	
	if(optional.loadHTML) {
		if(subjectID == USC_FOOTBALL_SUBJECT_ID) {
			byId("courses").innerHTML = USC_FOOTBALL_HTML
			return
		}
		showLoading("courses")
		// Get rid of old course list
		courseList = new Array()
		
		if(coursesHTML["subject_" + subjectID]) {
			byId("courses").innerHTML = coursesHTML["subject_" + subjectID]
			xmlDoc = getXMLDoc(coursesHTML["subject_" + subjectID])
			updateCourseList(subjectID, xmlDoc.getElementsByTagName("courseList").item(0))
			highlight(subjectObj)	// To override loading animation on mini search bar
		}
		else {
			xobj = getXMLHttp()
			xobj.onreadystatechange = function() {
				if(xobj.readyState == 4) {
					coursesHTML["subject_" + subjectID] = xobj.responseText
					byId("courses").innerHTML = xobj.responseText
					xmlDoc = getXMLDoc(xobj.responseText)
					updateCourseList(subjectID, xmlDoc.getElementsByTagName("courseList").item(0))
					highlight(subjectObj)	// To override loading animation on mini search bar
					reparseQuery()
				}
			}
			xobj.open("GET", "/courses.php?subjectID=" + subjectID, true)
			xobj.send(null)
		}
	}
}

function updateCourseList(subjectID, coursesObj) {
	courseList[subjectID] = new Array()
	courseList[subjectID] = coursesObj.getAttribute("numbers").split(",")
}

function loadCourse(number) {
    if (!byId(COURSE_HIDDEN_ID)) return;
	byId(COURSE_HIDDEN_ID).value = number
	courseObj = byId("course_" + number.toUpperCase())
	courseNumberObj = byId("course_" + number.toUpperCase() + "_number")
	if(!courseObj) {
		if(previousCourse) {
			unHighlight(previousCourse)
		}
		if(previousCourseNumber) {
			unHighlight(previousCourseNumber)
		}
		previousCourse = null
		previousCourseNumber = null
		return
	}
	
	if(courseObj == previousCourse) {
		return
	}
	
	if(previousCourse) {
		unHighlight(previousCourse)
	}
	
	if(previousCourseNumber) {
		unHighlight(previousCourseNumber)
	}
	
	highlight(courseObj)
	highlight(courseNumberObj)
	byId(COURSE_HIDDEN_ID).value = number	// In case unHighlight erased the value
	previousCourse = courseObj
	previousCourseNumber = courseNumberObj
}

function selectType(type) {
	byId(TYPE_HIDDEN_ID).value = type
	typeObj = byId(type)
	if(previousType == typeObj) {
		return
	}
	
	radio = byId(type + "Radio")
	if (radio) {
		radio.checked = true
		highlight(typeObj)
		if(previousType) {
			unHighlight(previousType)
			previousType.style.color = "black"
		}
		previousType = typeObj
	}
}
	

function showLoading(id) {
	byId(id).innerHTML = LOADING_HTML
}

function highlight(obj) {
	obj.style.color = "white"
	obj.style.fontWeight = "bold"
	obj.style.backgroundColor = "#696969"
//	obj.style.backgroundImage = "url('images/topbarbg.gif')"
	obj.style.backgroundPosition = "center center"
}

function unHighlight(obj) {
	obj.style.color = ""
	obj.style.fontWeight = "normal"
	obj.style.backgroundColor = "white"
	obj.style.backgroundImage = ""
}


function getXMLDoc(strXML) {
//load xml file
// code for IE
if (window.ActiveXObject)
{

  var doc=new ActiveXObject("Microsoft.XMLDOM");
  doc.async="false";
  doc.loadXML(strXML);
}
// code for Mozilla, Firefox, Opera, etc.
else if (document.implementation && document.implementation.createDocument)
{
var parser=new DOMParser();
var doc=parser.parseFromString(strXML,"text/xml");
}

else
{
	return false;
}
return doc.documentElement
}

function getXMLHttp()
  {
  var xmlHttp;
  try
    {
    // Firefox, Opera 8.0+, Safari
    return new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      return new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      try
        {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
      catch (e)
        {
        return false;
        }
      }
    }
  }

function addOptionalSpaces(regexStr) {
	regexStr = regexStr.replace(/(.)/g, "$1 ")
	regexStr = regexStr.trim()
	regexStr = regexStr.replace(/ /g, " ?")
	return regexStr
}

function Query(query, inputObj) 
{
	this.school = ""
	this.schoolWebName = ""
	this.subject = ""
	this.subjectID = 0
	this.number = ""
	this.type = ""
	this.courseNumber = ""
	this.query = query
	this.inputObj = inputObj
	this.prevSubject = null
	this.prevType = null
	this.prevNumber = null
	
	
	this.parseQuery = function(newQuery)
	{
		// Reset everything
		this.school = ""
		this.schoolWebName = ""
		this.subject = ""
		this.subjectID = 0
		this.type = ""
		this.courseNumber = ""
	
		// Store the query and then remove spaces from it
		this.query = newQuery
		newQuery = newQuery.replace(/[^A-Za-z0-9& ]/g,"")
		
		
		// First, extract the type
		var regex = new RegExp("(?: |^)(finals?|mid ?terms?|home ?works?|hws?|notes?)(?: |$)", ["i"])
		match = regex.exec(newQuery)
		if(match != null)
		{
			if(match[1][0] == "f")
				this.type = "final";
			else if(match[1][0] == "m")
				this.type = "midterm";
			else if(match[1][0] == "h")
				this.type = "hw";
			else if(match[1][0] == "n")
				this.type = "notes";
		}
		else
		{
			this.type = "all"
		}
		
		// Remove the type string from the query
		regex = new RegExp("(final|finals|mid ?term|mid ?terms|home ?work|hw|note|notes)", ["i"])
		newQuery = newQuery.replace(regex, "")
		
		// Next, look for a school name
		for(key in schoolSynonyms) {
			joined = schoolSynonyms[key].join("|").replace(/[^A-Za-z0-9 \t\n|]/g, "")
			regexStr = ("(?: |^)(" + addOptionalSpaces(joined) + ")(?: |$)")
			regex = eval("/" + regexStr + "/i")
			match = regex.exec(newQuery)
			if(match != null) {
				this.schoolWebName = key
				loadSchool(key)
				newQuery = newQuery.replace(regex, "")
				break
			}
		}
		
		// If we found a school, look for a subject
		if(this.schoolWebName != "") {
			longest = 0
			matchText = ""
			for(key in subjectSynonyms) {
				joined = subjectSynonyms[key].join("|").replace(/[^A-Za-z0-9 \t\n|]/g, "")
				regexStr = ("(?: |^)(" + addOptionalSpaces(joined) + ")(?: |$)")
				regex = eval("/" + regexStr + "/i")
				match = regex.exec(newQuery)
				if(match != null && match[1].length > longest) {
					this.subjectID = key
					longest = match[1].length
					matchText = match[1]
				}
				match = null
			}
			if(matchText != "") {
				newQuery = newQuery.replace(matchText, "")
			}
		}
		
		// Look for a course number
		if(this.schoolWebName != "" && this.subjectID != 0) {
			regex = /[ \t^]([A-Za-z0-9.]+)/
			match = regex.exec(newQuery)
			if(match != null) {
				this.courseNumber = match[1].toUpperCase()
			}
		}
		
		// If we have a school and subject, then look for a course number in
		// what's left of the query string
		try {
			if(this.schoolWebName != "" && this.subjectID != 0 && courseList[subjectID]) {
				longest = 0
				for(var i = 0; i < courseList[subjectID].length; i++) {
					// Some schools have 1, 2 or 3 zeros to pad the course numbers. Make those optional.
					couresNumRegex = courseList[subjectID][i]
					couresNumRegex = couresNumRegex.replace(/^000/, "0*")
					couresNumRegex = couresNumRegex.replace(/^00/, "0*")
					couresNumRegex = couresNumRegex.replace(/^0/, "0*")
					
					regex = eval("/[ \t^](" + couresNumRegex + ")/i")
					match = regex.exec(this.query)
					if(match != null && match[1].length > longest) {
						this.courseNumber = courseList[subjectID][i]
						longest = courseList[subjectID][i].length
					}
					match = null
				}
			}
		}
		catch(e) { }
		
		loadSchool(this.schoolWebName)
		loadSubject(this.subjectID)
		loadCourse(this.courseNumber)
		selectType(this.type)
	}
	
	this.updateQuery = function()
	{
		query = this.schoolWebName + " " + this.subjectID + " " + this.number + " " + this.type
		query = ""
		if(this.schoolWebName) {
			schoolObj = byId("school_" + schoolWebName)
			if(schoolObj.innerText)
				query += schoolObj.innerText
			else if(schoolObj.textContent)
				query += schoolObj.textContent
		}
		if(this.subjectID) {
			if(this.schoolWebName) query += " "
			subjectObj = byId("subject_" + subjectID)
			if(subjectObj.innerText)
				query += subjectObj.innerText
			else if(subjectObj.textContent)
				query += subjectObj.textContent
		}
		if(this.courseNumber) {
			if(this.subjectID) query += " "
			query += this.courseNumber
		}
		if(this.type && this.type != "all") {
			if(query.trim().length > 0) query += " "
			query += this.type
		}
		
		query = query.replace(/[\n\r]/g, "")
		this.inputObj.value = query
	}
	
	this.setSchool = function(newSchoolWebName) {
		this.schoolWebName = newSchoolWebName
	}
	
	this.setType = function(newType)
	{
		this.type = newType
	}
	
	this.setSubjectID = function(newSubjectID)
	{
		this.subjectID = newSubjectID
	}
	
	this.setCourse = function(newNumber)
	{
		this.courseNumber = newNumber	
	}
	
	//this.parseQuery(query)
	return this
};


var q = null

function reparseQuery() {
	if(q)
	{
		q.parseQuery(q.inputObj.value)
	}
}
	

function queryTypingHandler(e)
{
	reparseQuery()
}

function updateType(e)
{
	if(q)
	{
		inputs = document.getElementById("typeSelector").getElementsByTagName("input")
		for(i = 0; i < inputs.length; i++)
		{
			if(inputs.item(i).checked)
			{
				q.setType(inputs.item(i).value)
				q.updateQuery()
				break
			}
		}
	}
}

function updateSchool(schoolWebName)
{
	if(q)
	{
		q.setSchool(schoolWebName)
		q.setSubjectID(0)
		q.setCourse("")
		q.updateQuery()
	}
}

function updateSubjectID(subjectID)
{
	if(q)
	{
		q.setSubjectID(subjectID)
		q.setCourse("")
		q.updateQuery()
	}
}

function updateCourse(number)
{
	if(q)
	{
		q.setCourse(number)
		q.updateQuery()
	}
}

function init()
{
    /*
	q = Query("", document.getElementById("query"))
	alert(q);
	alert(q.parseQuery);
	alert(document.getElementById("query").value);
	q.parseQuery("ucla")
	document.getElementById("query").onkeyup = queryTypingHandler
	document.getElementById("query").onkeydown = queryTypingHandler
	document.getElementById("query").onchange = queryTypingHandler
	document.getElementById("query").onclick = queryTypingHandler
	*/
	document.getElementById("typeSelector").onclick = updateType
}