// dodo.email.js
// 0.2
// hookEmailCalls[plugName]=plugFunction;   to subscribe a function to the email hook.

// VARIABLES

var email = {
    input:      '',
    invalid:    'email not valid',
    openner:    'your email'
}

// FUNCTIONS

function emailCheck (emailStr) {

  /* The following variable tells the rest of the function whether or not
  to verify that the address ends in a two-letter country or well-known
  TLD.  1 means check it, 0 means don't. */
  
  var checkTLD=1;
  
  /* The following is the list of known TLDs that an e-mail address must end with. */
  
  var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum|tv)$/;
  
  /* The following pattern is used to check if the entered e-mail address
  fits the user@domain format.  It also is used to separate the username
  from the domain. */
  
  var emailPat=/^(.+)@(.+)$/;
  
  /* The following string represents the pattern for matching all special
  characters.  We don't want to allow special characters in the address. 
  These characters include ( ) < > @ , ; : \ " . [ ] */
  
  var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
  
  /* The following string represents the range of characters allowed in a 
  username or domainname.  It really states which chars aren't allowed.*/
  
  var validChars="\[^\\s" + specialChars + "\]";
  
  /* The following pattern applies if the "user" is a quoted string (in
  which case, there are no rules about which characters are allowed
  and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
  is a legal e-mail address. */
  
  var quotedUser="(\"[^\"]*\")";
  
  /* The following pattern applies for domains that are IP addresses,
  rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
  e-mail address. NOTE: The square brackets are required. */
  
  var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
  
  /* The following string represents an atom (basically a series of non-special characters.) */
  
  var atom=validChars + '+';
  
  /* The following string represents one word in the typical username.
  For example, in john.doe@somewhere.com, john and doe are words.
  Basically, a word is either an atom or quoted string. */
  
  var word="(" + atom + "|" + quotedUser + ")";
  
  // The following pattern describes the structure of the user
  
  var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
  
  /* The following pattern describes the structure of a normal symbolic
  domain, as opposed to ipDomainPat, shown above. */
  
  var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
  
  /* Finally, let's start trying to figure out if the supplied address is valid. */
  
  /* Begin with the coarse pattern to simply break up user@domain into
  different pieces that are easy to analyze. */
  
  var matchArray=emailStr.match(emailPat);
  
  if (matchArray==null) {
  
  /* Too many/few @'s or something; basically, this address doesn't
  even fit the general mould of a valid e-mail address. */
  
  // alert("Email address seems incorrect (check @ and .'s)");
  return false;
  }
  var user=matchArray[1];
  var domain=matchArray[2];
  
  // Start by checking that only basic ASCII characters are in the strings (0-127).
  
  for (i=0; i<user.length; i++) {
  if (user.charCodeAt(i)>127) {
  // alert("Ths username contains invalid characters.");
  return false;
     }
  }
  for (i=0; i<domain.length; i++) {
  if (domain.charCodeAt(i)>127) {
  // alert("Ths domain name contains invalid characters.");
  return false;
     }
  }
  
  // See if "user" is valid 
  
  if (user.match(userPat)==null) {
  
  // user is not valid
  
  // alert("The username doesn't seem to be valid.");
  return false;
  }
  
  /* if the e-mail address is at an IP address (as opposed to a symbolic
  host name) make sure the IP address is valid. */
  
  var IPArray=domain.match(ipDomainPat);
  if (IPArray!=null) {
  
  // this is an IP address
  
  for (var i=1;i<=4;i++) {
  if (IPArray[i]>255) {
  // alert("Destination IP address is invalid!");
  return false;
     }
  }
  return true;
  }
  
  // Domain is symbolic name.  Check if it's valid.
   
  var atomPat=new RegExp("^" + atom + "$");
  var domArr=domain.split(".");
  var len=domArr.length;
  for (i=0;i<len;i++) {
  if (domArr[i].search(atomPat)==-1) {
  // alert("The domain name does not seem to be valid.");
  return false;
     }
  }
  
  /* domain name seems valid, but now make sure that it ends in a
  known top-level domain (like com, edu, gov) or a two-letter word,
  representing country (uk, nl), and that there's a hostname preceding 
  the domain or country. */
  
  if (checkTLD && domArr[domArr.length-1].length!=2 && 
  domArr[domArr.length-1].search(knownDomsPat)==-1) {
  // alert("The address must end in a well-known domain or two letter " + "country.");
  return false;
  }
  
  // Make sure there's a host name preceding the domain.
  
  if (len<2) {
  // alert("This address is missing a hostname!");
  return false;
  }
  
  // If we've gotten this far, everything's valid!
  return true;
}


// RUN

jQuery(document).ready(function(){
  // alert('Email plugin linked and working.');

  jQuery('#message :input[name="email"]').val(email.openner)
  .focus(function() {
    jQuery('#message :input[name="email"]').val(email.input).removeClass("error");
  })
  .blur(function() {
    if (!jQuery('#message :input[name="email"]').val()) jQuery('#message :input[name="email"]').val(email.openner);
  })
  
  jQuery('#message input:submit').click(function() {  
  	var emailaddress=jQuery('#message :input[name="email"]').val();
  	if (emailCheck(emailaddress)) {
      return true;
  	}
  	else if (jQuery('#message :input[name="email"]').val() != email.invalid ) {
  	  email.input = jQuery('#message :input[name="email"]').val();
      jQuery('#message :input[name="email"]').val(email.invalid).addClass("error");
  	};
    return false;
  });

});