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// generic object maker prepares an empty array of n items
function makeArray(n) {
	this.length = n
	for (var i=1; i <= n; i++)
		this[i] = null
		return this
}

// create object listing all the top end of each numeric range
var ssn = new makeArray(57)
ssn[1] = 3
ssn[2] = 7
ssn[3] = 9
ssn[4] = 34
ssn[5] = 39
ssn[6] = 49
ssn[7] = 134
ssn[8] = 158
ssn[9] = 211
ssn[10] = 220
ssn[11] = 222
ssn[12] = 231
ssn[13] = 236
ssn[14] = 246
ssn[15] = 251
ssn[16] = 260
ssn[17] = 267
ssn[18] = 302
ssn[19] = 317
ssn[20] = 361
ssn[21] = 386
ssn[22] = 399
ssn[23] = 407
ssn[24] = 415
ssn[25] = 424
ssn[26] = 428
ssn[27] = 432
ssn[28] = 439
ssn[29] = 448
ssn[30] = 467
ssn[31] = 477
ssn[32] = 485
ssn[33] = 500
ssn[34] = 502
ssn[35] = 504
ssn[36] = 508
ssn[37] = 515
ssn[38] = 517
ssn[39] = 519
ssn[40] = 520
ssn[41] = 524
ssn[42] = 525
ssn[43] = 527
ssn[44] = 529
ssn[45] = 530
ssn[46] = 539
ssn[47] = 544
ssn[48] = 573
ssn[49] = 574
ssn[50] = 576
ssn[51] = 579
ssn[52] = 580
ssn[53] = 584
ssn[54] = 585
ssn[55] = 586
ssn[56] = 599
ssn[57] = 728

// create object listing all the states/territories
var geo = new makeArray(57)
geo[1] = "New Hampshire"
geo[2] = "Maine"
geo[3] = "Vermont"
geo[4] = "Massachusetts"
geo[5] = "Rhode Island"
geo[6] = "Connecticut"
geo[7] = "New York"
geo[8] = "New Jersey"
geo[9] = "Pennsylvania"
geo[10] = "Maryland"
geo[11] = "Delaware"
geo[12] = "Virginia"
geo[13] = "West Virginia"
geo[14] = "North Carolina"
geo[15] = "South Carolina"
geo[16] = "Georgia"
geo[17] = "Florida"
geo[18] = "Ohio"
geo[19] = "Indiana"
geo[20] = "Illinois"
geo[21] = "Michigan"
geo[22] = "Wisconsin"
geo[23] = "Kentucky"
geo[24] = "Tennessee"
geo[25] = "Alabama"
geo[26] = "Mississippi"
geo[27] = "Arkansas"
geo[28] = "Louisiana"
geo[29] = "Oklahoma"
geo[30] = "Texas"
geo[31] = "Minnesota"
geo[32] = "Iowa"
geo[33] = "Missouri"
geo[34] = "North Dakota"
geo[35] = "South Dakota"
geo[36] = "Nebraska"
geo[37] = "Kansas"
geo[38] = "Montana"
geo[39] = "Idaho"
geo[40] = "Wyoming"
geo[41] = "Colorado"
geo[42] = "New Mexico"
geo[43] = "Arizona"
geo[44] = "Utah"
geo[45] = "Nevada"
geo[46] = "Washington"
geo[47] = "Oregon"
geo[48] = "California"
geo[49] = "Alaska"
geo[50] = "Hawaii"
geo[51] = "District of Columbia"
geo[52] = "Virgin Islands"
geo[53] = "Puerto Rico"
geo[54] = "New Mexico"
geo[55] = "Guam, American Samoa, N. Mariana Isl., Philippines"
geo[56] = "Puerto Rico"
geo[57] = "Long-time or retired railroad workers"

// JavaScript sees numbers with leading zeros as octal values, so strip zeros
function stripZeros(inputStr) {
	var result = inputStr
	while (result.substring(0,1) == "0") {
		result = result.substring(1,result.length)
	}
	return result
}

// general purpose function to see if an input value has been entered at all
function isEmpty(inputStr) {
	if (inputStr == "" || inputStr == null) {
		return true
	}
	return false
}

// general purpose function to see if a suspected numeric input 
// is a positive integer
function isNumber(inputStr) {
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.substring(i, i + 1)
		if (oneChar < "0" || oneChar > "9") {
			return false
		}
	}
	return true
}

// function to determine if value is in acceptable range for this application
function inRange(inputStr) {
	num = parseInt(inputStr)
	if (num < 1 || num > 586 && num < 596 || num > 599 && num < 700 || num > 728) {
		return false
	}
	return true
}

// Master value validator routine
function isValid(inputStr) {
	if (isEmpty(inputStr)) {
		alert("Please enter a number into the field before clicking the button.")
		return false
	} else {
		if (!isNumber(inputStr)) {
			alert("Please make sure entries are numbers only.")
			return false
		} else {
			if (!inRange(inputStr)) {
				alert("Sorry, the number you entered is not part of our database.  Try another three-digit number.")
				return false
			}
		}
	}
	return true
}

// Roll through ssn database to find index; apply index to geography database
function search(form) {
	var foundMatch = false
	var inputStr = stripZeros(form.entry.value)
	if (isValid(inputStr)) {
		inputValue = inputStr
		for (var i = 1; i <= ssn.length; i++) {
			if (inputValue <= ssn[i]) {
				foundMatch = true
				break
			}
		}
	}
	form.result.value = (foundMatch) ? geo[i] : ""
	form.entry.focus()
	form.entry.select()
}
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