var FormValidation = function () {
	return {
		forms: {},	

		init: function(formId, config) {
			this.forms['form' + formId] = config;
		},
		
		validateCCard: function(ccNumber) {
			var valid = "0123456789"  // Valid digits in a credit card number
			ccNumber = ccNumber.replace(/\D*/g,''); // strip non-numerics
			
			//Test number
			if (ccNumber == '4444333322221111') {
				return true;
			} else {
				var len = ccNumber.length;  // The length of the submitted cc number
				var iCCN = parseInt(ccNumber);  // integer of ccNumber
				var iTotal = 0;  // integer total set at zero
				var bNum = true;  // by default assume it is a number
				var temp;  // temp variable for parsing string
				var calc;  // used for calculation of each digit
				
				// Determine if it is the proper length 
				if(len >= 0) {
					if(len >= 15){  // 15 or 16 for Amex or V/MC
						for(var i=len;i>0;i--){  // LOOP throught the digits of the card
							calc = parseInt(iCCN) % 10;  // right most digit
							calc = parseInt(calc);  // assure it is an integer
							iTotal += calc;  // running total of the card number as we loop - Do Nothing to first digit
							i--;  // decrement the count - move to the next digit in the card
							iCCN = iCCN / 10;                               // subtracts right most digit from ccNumber
							calc = parseInt(iCCN) % 10 ;    // NEXT right most digit
							calc = calc *2;                                 // multiply the digit by two
							// Instead of some screwy method of converting 16 to a string and then parsing 1 and 6 and then adding them to make 7,
							// I use a simple switch statement to change the value of calc2 to 7 if 16 is the multiple.
							switch(calc){
							  case 10: calc = 1; break;       //5*2=10 & 1+0 = 1
							  case 12: calc = 3; break;       //6*2=12 & 1+2 = 3
							  case 14: calc = 5; break;       //7*2=14 & 1+4 = 5
							  case 16: calc = 7; break;       //8*2=16 & 1+6 = 7
							  case 18: calc = 9; break;       //9*2=18 & 1+8 = 9
							  default: calc = calc;           //4*2= 8 &   8 = 8  -same for all lower numbers
							}                                               
							iCCN = iCCN / 10;  // subtracts right most digit from ccNum
							iTotal += calc;  // running total of the card number as we loop
						}  // END OF LOOP
						
						if ((iTotal%10)==0){  // check to see if the sum Mod 10 is zero
							return true;  // This IS (or could be) a valid credit card number.
						} else {
							return false;  // This could NOT be a valid credit card number
						}
					}
				}
			}
			  
			return false;
		},
		
		validate: function(form) {
			
			//Fetch the appropriate configuration
			if (typeof(this.forms[form.name]) == 'undefined') {
				alert('Form validation configuration not found!');
			} else {
				var regxEmail = new RegExp("^[\\w-_\.+]*[\\w-_\.]\@([\\w]+\\.)+[\\w]+[\\w]$");
				
				var errors = [];
				for (var fieldId in this.forms[form.name]) {
					var validate = this.forms[form.name][fieldId];
					if (typeof(form[fieldId]) == 'undefined') {
						errors.push('The "' + validate.label + '" field was not found on the form!');
					} else {
						var field = form[fieldId];
						
						switch (validate.type) {
						case 'text':
						case 'file':
						case 'freeform':
							
							if (field.value == '') {
								if (validate.required == true) {
									errors.push('"' + validate.label + '" is a required field');
								}								
							} else {
								switch (validate.validation) {
								case 'email':
									if (regxEmail.test(field.value) == false) {
										errors.push('Invalid email address specified for "' + validate.label + '"')
									}
									break;
								case 'ccard':
									if (this.validateCCard(field.value) == false) {
										errors.push('Invalid credit card number for "' + validate.label + '"')
									}
									break;
								}
							}
							
							break;
						case 'combo':
							if (validate.required) {
								if (field.options[field.selectedIndex].value == '') {
									errors.push('"' + validate.label + '" is a required field');
								}
							}
							break;
						}

					}
				}
				
				if (errors.length > 0) {
					alert('Please correct the following errors on the form before re-submitting:\n\n' + errors.join('\n'));
					return false;
				} else {
					return true;
				}
				
			}
			
			return false;
		}
	
	};
}();