/*************************************************************/
    /* Name : Anthony Alves                                      */
    /*************************************************************/

function checkForm() 
{
        var error_message = "";
        var temp_error = new Array(12);

        temp_error[0] = surname();
        temp_error[1] = clientid(); 
        temp_error[2] = telephone();
        temp_error[3] = dob();
        temp_error[4] = size();
        temp_error[5] = sauce();


        if(temp_error[0] != "")
        {
                error_message += temp_error[0] + "\n";
        }
        if(temp_error[1] != "")
        {
                error_message += temp_error[1] + "\n";
        }
        if(temp_error[2] != "")
        {
                error_message += temp_error[2] + "\n";
        }
        if(temp_error[3] != "")
        {
                error_message += temp_error[3] + "\n";
        }
        if(temp_error[4] != "")
        {
                error_message += temp_error[4] + "\n";
        }
        if(temp_error[5] != "")
        {
                error_message += temp_error[5] + "\n";
        }


        if(error_message.length != "")
        {
                error_message = pageHeader(error_message);
                error_message += temp_error[0];
                error_message += temp_error[1];
                error_message += temp_error[2];
                error_message += temp_error[3];
                error_message += temp_error[4];
                error_message += temp_error[5];
                error_message = pageFooter(error_message);
                error_window = window.open("", "errors", 'width=450, height=300');
                error_window.document.write(error_message);
                error_window.document.close();
                return false;
        }
        else
                return true;
}

function surname()
{
        var field01 = document.pizza.field01.value;
        /*var field01 = document.getElementById('field01');*/

        if(field01 == "")
                return "Must have a surname.  ";
        else
        {
                for(var i=0; i<field01.length; i++)
                {
                        if(field01.charCodeAt(i) < 65 || field01.charCodeAt(i) > 90 && field01.charCodeAt(i) < 97 || field01.charCodeAt(i) > 122) 
                        {
                                if(field01.length < 4)
                                {
                                        return "Customer surname must contain at least 4 characters, all must be alphabetic.  ";
                                }
                                else
                                        return "All characters in surname must be alphabetic.  ";
                        }
                }
                if(field01.length < 4)
                        return "Customer surname must be at least 4 characters.  ";
        }

        for(var i=0; i<field01.length; i++)
        {
                if(field01.charCodeAt(i) < 65 || field01.charCodeAt(i) > 90 && field01.charCodeAt(i) < 97 || field01.charCodeAt(i) > 122) 
                        return "All characters in surname must be alphabetic.  ";
        }
        return "";
}

function clientid()
{
        var field02 = document.pizza.field02.value;
        var left_sum = 0;
        var right_sum = 0;

        if(field02.length != 12)
                return "ClientID must be 12 characters.  ";

        if(field02.charCodeAt(0) != 65 && field02.charCodeAt(0) != 70)
                return "The first character in ClientID must be either an upper case A or F.  ";

        if(field02.charCodeAt(6) != 45)
                return "The Seventh position must be a hyphen (-).  ";

        for(i=1; i<6; i++)
        {
                left_sum += eval(field02.charAt(i));

                if(field02.charCodeAt(i) < 48 || field02.charCodeAt(i) > 57)
                        return "The second through sixth characters must be numeric.  ";
        }

        for(i=7; i<12; i++)
        {
                right_sum += eval(field02.charAt(i));

                if(field02.charCodeAt(i) < 48 || field02.charCodeAt(i) > 57)
                        return "The eighth through twelfth characters must be numeric.  ";
        }

        if(left_sum > right_sum)
                return "The sum of the second through sixth characters must be less than the sum of the eighth through twelfth characters.  ";

        return "";
}
    
function telephone()
{
        var field03 = document.pizza.field03.value;

        if(field03 == "")
                return "Must have a telephone number.  ";

        if(field03.length < 12)
                return "Not enough characters in the telephone number.  ";

        for(var i=1; i<6; i++)
        {
                if(i == 3 || i == 7)
                        i++;                

                if(field03.charCodeAt(i) < 48 || field03.charCodeAt(i) > 57)
                        return "The telephone number must consist of all numeric characters with the exception of hyphens (123-456-7890).  ";
        }

        if(field03.charCodeAt(3) != 45 || field03.charCodeAt(7) != 45)
                return "The fourth and eighth position of the telephone number must be a hyphen (123-456-7890).  ";

        if(field03.charAt(0) ==0 && field03.charAt(1) ==0 && field03.charAt(2) ==0)
                return "The area code of the telephone number cannot be all 0's.  ";

        if(field03.charAt(4) ==0 && field03.charAt(5) ==0 && field03.charAt(6) ==0 && field03.charAt(8) ==0 && field03.charAt(9) ==0 && field03.charAt(10) ==0 && field03.charAt(11) ==0)
                return "The telephone number cannot be all 0's.   ";

        return "";
}

function dob()
{
        var field04 = document.pizza.field04.value;
        var month = field04.substring(0,3);
        var year = field04.substring(3,7);
        var cur_date = new Date();
        var cur_year = cur_date.getFullYear();
        var age = eval('cur_year - year');

        if(field04 == "")
                return "Must have a date of birth.  ";
        
        if(field04.length < 7)
                return "Not enough characters in the date of birth, please enter in format mmmyyyy.  ";

        if(month.toLowerCase() != "jan" && month.toLowerCase() != "feb" && month.toLowerCase() != "mar" && month.toLowerCase() != "apr" && month.toLowerCase() != "may" && month.toLowerCase() != "jun" && month.toLowerCase() != "jul" && month.toLowerCase() != "aug" && month.toLowerCase() != "sep" && month.toLowerCase() != "oct" && month.toLowerCase() != "nov" && month.toLowerCase() != "dec")
                return "Not a valid month abbreviation in date of birth.  ";

        for(var i=3; i<7; i++)
        {
                if(field04.charCodeAt(i) < 48 || field04.charCodeAt(i) > 57)
                        return "The last four characters of date of birth must be numeric.  ";
        }

        if(age < 19)
                return "Invalid age, client is under 19 years of age.  "

        return ""; 
} 

function size()
{
        var field05 = document.pizza.field05.value;

        if(field05 != "Small" && field05 != "Medium" && field05 != "Large")
                return "A size of pizza must be selected.  "

        return "";
}

function sauce()
{
        if(document.pizza.field09[0].checked == false && document.pizza.field09[1].checked == false && document.pizza.field09[2].checked == false)
                return "A type of sauce must be selected.  ";

        return "";
}

function calculatePrice_s()
{
        var total = 0;
        s_oneCheck();

        if(document.pizza.field05.value == "Small")
                total = 13.35;

        if(document.pizza.field05.value == "Medium")
                total = 17.50;

        if(document.pizza.field05.value == "Large")
                total = 22.00;

        for(var i=0; i<6; i++)
        {
                if(document.pizza.field10s[i].checked == true)
                        total += 1.25;

                if(document.pizza.field10d[i].checked == true)
                        total+= 1.96;
        }

        document.pizza.field07.value = total;
}

function calculatePrice_d()
{
        var total = 0;
        d_oneCheck();

        if(document.pizza.field05.value == "Small")
                total = 13.35;

        if(document.pizza.field05.value == "Medium")
                total = 17.50;

        if(document.pizza.field05.value == "Large")
                total = 22.00;

        for(var i=0; i<6; i++)
        {
                if(document.pizza.field10s[i].checked == true)
                        total += 1.25;

                if(document.pizza.field10d[i].checked == true)
                        total+= 1.96;
        }

        document.pizza.field07.value = total;
}

function s_oneCheck()
{
        for(var i=0; i<6; i++)
        {
                if(document.pizza.field10s[i].checked == true && document.pizza.field10d[i].checked == true)
                        document.pizza.field10d[i].checked = false;
        }
}

function d_oneCheck()
{
        for(var i=0; i<6; i++)
        {
                if(document.pizza.field10s[i].checked == true && document.pizza.field10d[i].checked == true)
                        document.pizza.field10s[i].checked = false;
        }
}

        function pageHeader(content) {
       content = '<?xml version="1.0"encoding="UTF-8" ?>\n';
       content += '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"\n';
       content += '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\n';
       content += ' <html xmlns="http://www.w3.org/1999/xhtml">\n';
       content += '  <head>\n';
       content += '   <title>form validation</title>\n';
       content += '  </head>\n';
       content += '  <body>\n';
       content += '   <h3>Please correct the following and resubmit the form</h3>\n';
       content += '   <ul>\n';
       return content;
     }


     function pageFooter(content) {
       content += '   </ul>\n';
       content += '  </body>\n';
       content += ' </html>\n';
       return content;
     }