// Given a form field object, returns a message to display when the field failed validation. If the
// field has the valid_message attribute, it is returned as is. Else, if the valid attribute is present, it
// is inspected and a message is created based on the type of validation. Otherwise, an empty string is returned.
function ValidationMessage(field)
{
    var msg = $(field).attr('valid_message') || '';
    if (msg.length == 0)
    {
        var validator = $.trim($(field).attr('valid'));
        
        // see if the field was optional
        if (validator.charAt(0) == '(' && validator.charAt(validator.length-1) == ')')
            validator = validator.substr(1, validator.length-2);
            
        if (validator.substr(0,4) == 'num:')
        {
			var range = validator.substring(4).split(' ');
			var lo = range[0];
			var hi = range[1];
            msg = 'Please enter a number between ' + lo + ' and ' + hi;
        }
        else if (validator == 'phone')
            msg = 'Please enter a valid phone number (nnn-nnn-nnnn)'
		else if (validator == 'password')
		    msg = 'Passwords need to be at least 8 characters long and must include at least one digit (0-9)'
		else if (validator == 'posnum')
			msg = 'Please enter a number greater than 0.'
		else if (validator == 'email')
		    msg = 'Please enter a valid email address 50 characters or less.'
		else if (validator == 'notblank')
		    msg = 'Please enter a value.'
		else if (validator.substr(0, 7) == 'string:')
		{
			var range = validator.substring(7).split(' ');
			var lo = range[0];
			var hi = range[1];
			if (lo == hi)
			    msg = 'Please enter a value ' + lo + ' characters long.';
			else
			    msg = 'Please enter no more than ' + hi + ' characters.';
		}
		else if (validator.substr(0, 8) == 'matches:')
		{
			var otherName = validator.substring(8);
			msg = 'This field must match the ' + otherName + ' field.';
		}
		else if (validator.substr(0, 8) == 'hostname')
		{
		    msg = 'This value must be valid for use in domain names.';
		}
    }
    return msg;
}

// Validates a form based on attributes of form inputs. If all fields validate, returns true. Otherwise,
// displays an error message, gives the first erroneous field focus, and returns false.
// Validation happens by checking
// each input - any input with a valid="" attribute is checked. The values currently supported are:
// 'num:m n' - input must be a number between m and n, inclusive
// 'phone' - input must appear to be a phone number
// 'posnum' - input must be a positive number.
// 'notblank' - input must not be blank.
// 'email' - input must appear to be a valid email address
// 'string:m n' - input must be a string between m and n characters long, inclusive
// 'matches:name' - this field's value must match the value of a field named 'name'
// 'password' - qualifies under our password policy - >= 8 chars, at least 1 is a digit
// If the validator is in parentheses, it means that the field is optional. If a value is given, though, it must pass the validator test.
// TODO: possibly allow for comma-separated list or something. Add more.
// complete (optional, defaults to RefreshStatus) tells the function to call after load completes
// Err(badFields) gets called with a list of fields that failed validation. If not supplied, a cheesy
// Err function is used.
function _DefaultErr(badFields)
{   // default error handling imeplementation - throws an alert for the first failed field, sets the focus, and exits.
    var el = badFields[0];
    alert(ValidationMessage(el));
    $(el).focus();
}

function ValidateForm(form, Err)
{
    var badFields = [];
	var els = $(form).find(':input');
	for (var i=0; i < els.length; i++)
	{
		var el = els[i];
		var validator = $.trim(el.getAttribute('valid') || '');
		if (!validator)
			continue;

		var v = $.trim($(el).val()); // todo: make this work for checkboxes... if we need it
		
		// if the validator is in parentheses then that means the field is optional. So, it can be blank but if a value is
		// given, it must pass the validator test.
		//alert($(el).attr('name') + ' ' + v)
		if (validator.charAt(0) == '(' && validator.charAt(validator.length-1) == ')')
		{
		    validator = validator.substr(1, validator.length-2);
		    if (!v || v.length == 0)
		        continue;
		}

		if (validator.substr(0,4) == 'num:')
		{
			var range = validator.substring(4).split(' ');
			var lo = range[0];
			var hi = range[1];
			if (v.length == 0 || isNaN(v) || parseFloat(v) < lo || parseFloat(v) > hi)
			    badFields.push(el);
		}
		else if (validator == 'phone')
		{
		    v = v.toLowerCase()
		    var hadLetter = false;
		    var digits = [];
		    for (var j=0; j < v.length; j++)
		    {
		        var ch = v.charAt(j);
		        if (ch >= 'a' && ch <= 'z')
		            hadLetter = true;
		        else if (ch >= '0' && ch <= '9')
		            digits.push(ch)
		    }
		    
		    if (hadLetter > 0)
		        badFields.push(el);
		    else
		    {
		        if (digits.length == 11 && digits[0] == '1') // strip off long-distance '1'
		            digits = digits.slice(1);
		        if (digits.length != 10)
		            badFields.push(el)
		        else
		        {
		            // put a pretty-printed version of the phone number back into the field
		            digits = digits.join('')
		            $(el).val(digits.substr(0,3) + '-' + digits.substr(3,3) + '-' + digits.substr(6))
		        }
		    }
		}
		else if (validator == 'password')
		{
		    var digits = 0;
		    var other = 0;
		    for (var j=0; j < v.length; j++)
		    {
		        var ch = v.charAt(j);
		        if (ch >= '0' && ch <= '9')
		            digits++;
		        else
		            other++;
		    }
		    
		    if ((digits + other < 8) || digits < 1)
		        badFields.push(el);
		}
		else if (validator == 'posnum' && (v.length == 0 || isNaN(v) || parseFloat(v) <= 0))
		    badFields.push(el);
		else if (validator == 'email')
		{
		    var emailRE = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		    if (v.length == 0 || !emailRE.test(v) || v.length > 50)
		        badFields.push(el);
		}
		else if (validator == 'notblank' && $.trim(v || '').length == 0)
		    badFields.push(el);
		else if (validator.substr(0, 7) == 'string:')
		{
			var range = validator.substring(7).split(' ');
			var lo = range[0];
			var hi = range[1];
			var len = $.trim(v || '').length;
			if (((lo == hi) && (len != lo)) || (len < lo || len > hi))
			    badFields.push(el);
		}
		else if (validator.substr(0, 8) == 'matches:')
		{
			var otherName = validator.substring(8);
			var other = $(form).find('[name=' + otherName + ']').val();
			if ($.trim(other) != v)
			    badFields.push(el);
		}
		else if (validator.substr(0, 8) == 'hostname')
		{
		    v = v.toLowerCase();
		    re = /^[a-z]+[a-z0-9\-]+$/;
		    if(v.length == 0 || !re.test(v)){
		        badFields.push(el);
		    }
		}
	}

    if (badFields.length > 0)
    {
        if (!Err) Err = _DefaultErr;
        Err(badFields);
        return false;
    }
    
	return true;
}

// Validates the form using ValidateForm and, if all validate, submits it via Ajax. Always returns false.
// Target should be a jQuery identifer, e.g. '#someDivID' to hold the response.
// complete (optional, defaults to RefreshStatus) tells the function to call after load completes
function ValidateAndSubmit(form, target, complete)
{
	if (!ValidateForm(form))
		return false;
	if (!complete) complete = window.RefreshStatus; // todo: move this elsewhere
	var opts = {complete:complete};
	if (target)
	    opts.target = target;
	$(form).ajaxSubmit(opts);
	return false;
}

function CreateCookie(name,value,days) 
{
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function ReadCookie(name, default_val) 
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') 
		    c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) 
		    return c.substring(nameEQ.length,c.length);
	}
	return default_val;
}

function EraseCookie(name) 
{
	CreateCookie(name,"",-1);
}

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// opens a div as a modal dialog. the div should have classes like "popup large green_large" and then have a containing div
// with a class of popup_content.Use ClosePopup when done. If URL is provided, it is used via AJAX to populate the div before display.
var _popupDiv = null;
var _popupCloseCB = null;
function _popSetDisplay(idSelector, display)
{
    $('#overlay').css('display', display);
    $(idSelector).css('display', display);
}

function Popup(idSelector, url, openCB, closeCB)
{
    _popupDiv = idSelector;
    _popupCloseCB = closeCB;
	if (url)
	{
	    $.get(url, {}, function(data)
    	{
    	    $(idSelector + ' > .popup_content').html(data);
    	    //$(idSelector + ' > .popup_content').each(function() { alert(this); })
    	    _popSetDisplay(idSelector, 'block')
    		if (openCB && typeof(openCB) == 'string')
    		    openCB = window[openCB];
    		if (openCB && typeof(openCB) == 'function')
    		    openCB();
    	});
    }
    else
    {
        _popSetDisplay(idSelector, 'block')
		if (openCB && typeof(openCB) == 'string')
		    openCB = window[openCB];
		if (openCB && typeof(openCB) == 'function')
		    openCB();
    }
	return false;
}

// utility function to close the most recent popup
// by default, clears out the container contents
function ClosePopup(leaveContents)
{
    if (!_popupDiv)
        return;
    _popSetDisplay(_popupDiv, 'none')
    //if (!leaveContents)
    //    $(_popupDiv).html('');
    if (_popupCloseCB)
        setTimeout(_popupCloseCB, 1);
    _popupDiv = null;
    _popupCloseCB = null;
}

function GetPageParams()
{   // reads off a parameter string and returns it as a dictionary
    var url = window.location.search;
    var i = url.indexOf('?');
    if (i == -1)
        return {};

    var ret = {};
    var params = url.substr(i+1).split('&');
    for (var i=0; i<params.length; i++)
    {
        var param = params[i].split('=', 2);
        if (param.length == 1)
            ret[param[0]] = true;
        else if (param.length == 2)
            ret[param[0]] = decodeURIComponent(param[1]);
    }
    return ret;
}