/*! H5F - v1.0.0 - 2012-07-18
* https://github.com/ryanseddon/H5F/
* Copyright (c) 2012 Ryan Seddon; Licensed MIT */

var H5F = H5F || {};

(function(d){
    
    var field = d.createElement("input"),
        emailPatt = /^[a-zA-Z0-9.!#$%&'*+-\/=?\^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/,
        urlPatt = /[a-z][\-\.+a-z]*:\/\//i,
        nodes = /^(input|select|textarea)$/i,
        isSubmit, usrPatt, curEvt, args, custMsg = "",
        // Methods
        setup, validation, validity, checkField, checkValidity, setCustomValidity, support, pattern, placeholder, range, required, valueMissing, listen, unlisten, preventActions, getTarget, addClass, removeClass, isHostMethod;
    
    setup = function(form,settings) {
        var isCollection = !form.nodeType || false;
        
        var opts = {
            validClass : "valid",
            invalidClass : "error",
            requiredClass : "required",
            placeholderClass : "placeholder"
        };

        if(typeof settings === "object") {
            for (var i in opts) {
                if(typeof settings[i] === "undefined") { settings[i] = opts[i]; }
            }
        }
        
        args = settings || opts;
        
        if(isCollection) {
            for(var k=0,len=form.length;k<len;k++) {
                validation(form[k]);
            }
        } else {
            validation(form);
        }
    };
    
    validation = function(form) {
        var f = form.elements,
            flen = f.length,
            isRequired, noValidate = !!(form.attributes["novalidate"]);
        
        listen(form,"invalid",checkField,true);
        listen(form,"blur",checkField,true);
        listen(form,"input",checkField,true);
        listen(form,"keyup",checkField,true);
        listen(form,"focus",checkField,true);
        
        listen(form,"submit",function(e){
            isSubmit = true;
            if(!noValidate && !form.checkValidity()) {
                preventActions(e);
            }
        },false);
        
        if(!support()) { 
            form.checkValidity = function() { return checkValidity(form); };
            
            while(flen--) {
                isRequired = !!(f[flen].attributes["required"]);
                // Firefox includes fieldsets inside elements nodelist so we filter it out.
                if(f[flen].nodeName.toLowerCase() !== "fieldset") {
                    validity(f[flen]); // Add validity object to field
                }
            }
        }
    };
    validity = function(el) {
        var elem = el,
            missing = valueMissing(elem),
            attrs = { 
                type: elem.getAttribute("type"), 
                pattern: elem.getAttribute("pattern"), 
                placeholder: elem.getAttribute("placeholder") 
            },
            isType = /^(email|url)$/i,
            evt = /^(input|keyup)$/i,
            fType = ((isType.test(attrs.type)) ? attrs.type : ((attrs.pattern) ? attrs.pattern : false)),
            patt = pattern(elem,fType),
            step = range(elem,"step"),
            min = range(elem,"min"),
            max = range(elem,"max"),
            customError = (custMsg !== "");
        
        elem.checkValidity = function() { return checkValidity.call(this,elem); };
        elem.setCustomValidity = function(msg) { setCustomValidity.call(elem,msg); };
        elem.validationMessage = custMsg;
        
        elem.validity = {
            valueMissing: missing,
            patternMismatch: patt,
            rangeUnderflow: min,
            rangeOverflow: max,
            stepMismatch: step,
            customError: customError,
            valid: (!missing && !patt && !step && !min && !max && !customError)
        };
        
        if(attrs.placeholder && !evt.test(curEvt)) { placeholder(elem); }
    };
    checkField = function (e) {
        var el = getTarget(e) || e, // checkValidity method passes element not event
            events = /^(input|keyup|focusin|focus)$/i,
            ignoredTypes = /^(submit|image|button|reset)$/i,
            checkForm = true;
        
        if(nodes.test(el.nodeName) && !(ignoredTypes.test(el.type) || ignoredTypes.test(el.nodeName))) {
            curEvt = e.type;
            if(!support()) { validity(el); }
            
            if(el.validity.valid && el.value !== "" || el.value !== el.getAttribute("placeholder") && el.validity.valid) {
                removeClass(el,[args.invalidClass,args.requiredClass]);
                addClass(el,args.validClass);
            } else if(!events.test(curEvt)) {
                if(el.validity.valueMissing) {
                    removeClass(el,[args.invalidClass,args.validClass]);
                    addClass(el,args.requiredClass);
                } else if(!el.validity.valid) {
                    removeClass(el,[args.validClass,args.requiredClass]);
                    addClass(el,args.invalidClass);
                }
            } else if(el.validity.valueMissing) {
                removeClass(el,[args.requiredClass,args.invalidClass,args.validClass]);
            }
            if(curEvt === "input" && checkForm) {
                // If input is triggered remove the keyup event
                unlisten(el.form,"keyup",checkField,true);
                checkForm = false;
            }
        }
    };
    checkValidity = function (el) {
        var f, ff, isRequired, hasPattern, invalid = false;
        
        if(el.nodeName.toLowerCase() === "form") {
            f = el.elements;
            
            for(var i = 0,len = f.length;i < len;i++) {
                ff = f[i];
                
                isRequired = !!(ff.attributes["required"]);
                hasPattern = !!(ff.attributes["pattern"]);
                
                if(ff.nodeName.toLowerCase() !== "fieldset" && (isRequired || hasPattern && isRequired)) {
                    checkField(ff);
                    if(!ff.validity.valid && !invalid) {
                        if(isSubmit) { // If it's not a submit event the field shouldn't be focused
                            ff.focus();
                        }
                        invalid = true;
                    }
                }
            }
            return !invalid;
        } else {
            checkField(el);
            return el.validity.valid;
        }
    };
    setCustomValidity = function (msg) {
        var el = this;
        custMsg = msg;
            
        el.validationMessage = custMsg;
    };
    
    support = function() {
        return (isHostMethod(field,"validity") && isHostMethod(field,"checkValidity"));
    };

    // Create helper methods to emulate attributes in older browsers
    pattern = function(el, type) {
        if(type === "email") {
            return !emailPatt.test(el.value);
        } else if(type === "url") {
            return !urlPatt.test(el.value);
        } else if(!type) {
            return false;
        } else {
            var placeholder = el.getAttribute("placeholder"),
                val = el.value;
            
            usrPatt = new RegExp('^(?:' + type + ')$');
            
            if(val === placeholder) {    
                return true;
            } else if(val === "") {
                return false;
            } else {
                return !usrPatt.test(el.value);
            }
        }
    };
    placeholder = function(el) {
        var attrs = { placeholder: el.getAttribute("placeholder") },
            focus = /^(focus|focusin|submit)$/i,
            node = /^(input|textarea)$/i,
            ignoredType = /^password$/i,
            isNative = !!("placeholder" in field);
        
        if(!isNative && node.test(el.nodeName) && !ignoredType.test(el.type)) {
            if(el.value === "" && !focus.test(curEvt)) {
                el.value = attrs.placeholder;
                listen(el.form,'submit', function () {
                  curEvt = 'submit';
                  placeholder(el);
                }, true);
                addClass(el,args.placeholderClass);
            } else if(el.value === attrs.placeholder && focus.test(curEvt)) {
                el.value = "";
                removeClass(el,args.placeholderClass);
            }
        }
    };
    range = function(el,type) {
        // Emulate min, max and step
        var min = parseInt(el.getAttribute("min"),10) || 0,
            max = parseInt(el.getAttribute("max"),10) || false,
            step = parseInt(el.getAttribute("step"),10) || 1,
            val = parseInt(el.value,10),
            mismatch = (val-min)%step;
        
        if(!valueMissing(el) && !isNaN(val)) {
            if(type === "step") {
                return (el.getAttribute("step")) ? (mismatch !== 0) : false;
            } else if(type === "min") {
                return (el.getAttribute("min")) ? (val < min) : false;
            } else if(type === "max") {
                return (el.getAttribute("max")) ? (val > max) : false;
            } 
        } else if(el.getAttribute("type") === "number") { 
            return true;
        } else {
            return false;
        }
    };
    required = function(el) {
        var required = !!(el.attributes["required"]);
        
        return (required) ? valueMissing(el) : false;
    };
    valueMissing = function(el) {
        var placeholder = el.getAttribute("placeholder"),
            isRequired = !!(el.attributes["required"]);
        return !!(isRequired && (el.value === "" || el.value === placeholder));
    };
    
    /* Util methods */
    listen = function (node,type,fn,capture) {
        if(isHostMethod(window,"addEventListener")) {
            /* FF & Other Browsers */
            node.addEventListener( type, fn, capture );
        } else if(isHostMethod(window,"attachEvent") && typeof window.event !== "undefined") {
            /* Internet Explorer way */
            if(type === "blur") {
                type = "focusout";
            } else if(type === "focus") {
                type = "focusin";
            }
            node.attachEvent( "on" + type, fn );
        }
    };
    unlisten = function (node,type,fn,capture) {
        if(isHostMethod(window,"removeEventListener")) {
            /* FF & Other Browsers */
            node.removeEventListener( type, fn, capture );
        } else if(isHostMethod(window,"detachEvent") && typeof window.event !== "undefined") {
            /* Internet Explorer way */
            node.detachEvent( "on" + type, fn );
        }
    };
    preventActions = function (evt) {
        evt = evt || window.event;
        
        if(evt.stopPropagation && evt.preventDefault) {
            evt.stopPropagation();
            evt.preventDefault();
        } else {
            evt.cancelBubble = true;
            evt.returnValue = false;
        }
    };
    getTarget = function (evt) {
        evt = evt || window.event;
        return evt.target || evt.srcElement;
    };
    addClass = function (e,c) {
        var re;
        if (!e.className) {
            e.className = c;
        }
        else {
            re = new RegExp('(^|\\s)' + c + '(\\s|$)');
            if (!re.test(e.className)) { e.className += ' ' + c; }
        }
    };
    removeClass = function (e,c) {
        var re, m, arr = (typeof c === "object") ? c.length : 1, len = arr;
        if (e.className) {
            if (e.className === c) {
                e.className = '';
            }
            else {        
                while(arr--) {
                    re = new RegExp('(^|\\s)' + ((len > 1) ? c[arr] : c) + '(\\s|$)');
                    m = e.className.match(re);
                    if (m && m.length === 3) { e.className = e.className.replace(re, (m[1] && m[2])?' ':''); }
                }
            }
        }
    };
    isHostMethod = function(o, m) {
        var t = typeof o[m], reFeaturedMethod = new RegExp('^function|object$', 'i');
        return !!((reFeaturedMethod.test(t) && o[m]) || t === 'unknown');
    };
    
    // Since all methods are only used internally no need to expose globally
    window["H5F"] = {
        setup: setup
    };

}(document));