/**
 * NetteForms - simple form validation.
 *
 * This file is part of the Nette Framework.
 * Copyright (c) 2010 David Grudl (http://davidgrudl.com)
 */

var Nette = Nette || {};

Nette.addEvent = function (element, on, callback) {
    var original = element['on' + on];
    element['on' + on] = function () {
        if (typeof original === 'function' && original.apply(element, arguments) === false) return false;
        return callback.apply(element, arguments);
    };
};


Nette.getValue = function(elem) {
    if (!elem) {
        return null;

    } else if (!elem.nodeName) { // radio
        for (var i = 0, len = elem.length; i < len; i++) {
            if (elem[i].checked) {
                return elem[i].value;
            }
        }
        return null;

    } else if (elem.nodeName.toLowerCase() === 'select') {
        var index = elem.selectedIndex, options = elem.options;

        if (index < 0) {
            return null;

        } else if (elem.type === 'select-one') {
            return options[index].value;
        }

        for (var i = 0, values = [], len = options.length; i < len; i++) {
            if (options[i].selected) {
                values.push(options[i].value);
            }
        }
        return values;

    } else if (elem.type === 'checkbox') {
        return elem.checked;

    } else if (elem.type === 'radio') {
        return Nette.getValue(elem.form.elements[elem.name]);

    } else {
        return elem.value.replace(/^\s+|\s+$/g, '');
    }
};


Nette.validateControl = function(elem, rules, onlyCheck) {
    rules = rules || eval('[' + (elem.getAttribute('data-nette-rules') || '') + ']');
    for (var id in rules) {
        var rule = rules[id], op = rule.op.match(/(~)?([^?]+)/);
        rule.neg = op[1];
        rule.op = op[2];
        rule.condition = !!rule.rules;
        var el = rule.control ? elem.form.elements[rule.control] : elem;

        var success = Nette.validateRule(el, rule.op, rule.arg);
        if (success === null) continue;
        if (rule.neg) success = !success;

        if (rule.condition && success) {
            if (!Nette.validateControl(elem, rule.rules, onlyCheck)) {
                return false;
            }
        } else if (!rule.condition && !success) {
            if (el.disabled) continue;
            if (!onlyCheck) {
                Nette.addError(el, rule.msg.replace('%value', Nette.getValue(el)));
            }
            return false;
        }
    }
    return true;
};


Nette.validateForm = function(sender) {
    var form = sender.form || sender;
    if (form['nette-submittedBy'] && form.elements[form['nette-submittedBy']] && form.elements[form['nette-submittedBy']].getAttribute('formnovalidate') !== null) {
        return true;
    }
    for (var i = 0; i < form.elements.length; i++) {
        var elem = form.elements[i];
        if (!(elem.nodeName.toLowerCase() in {
            input:1,
            select:1,
            textarea:1
        }) || (elem.type in {
            hidden:1,
            submit:1,
            image:1,
            reset: 1
        }) || elem.disabled || elem.readonly) {
            continue;
        }
        if (!Nette.validateControl(elem)) {
            return false;
        }
    }
    return true;
};


Nette.addError = function(elem, message) {
    if (elem.focus) {
        elem.focus();
    }
    if (message) {
        alert(message);
    }
};


Nette.validateRule = function(elem, op, arg) {
    var val = Nette.getValue(elem);

    if (elem.getAttribute) {
        if (val === elem.getAttribute('data-nette-empty-value')) val = null;
    }

    switch (op) {
        case ':filled':
            return val !== '' && val !== false && val !== null;

        case ':valid':
            return Nette.validateControl(elem, null, true);

        case ':equal':
            arg = arg instanceof Array ? arg : [arg];
            for (var i in arg) {
                if (val == (arg[i].control ? Nette.getValue(elem.form.elements[arg[i].control]) : arg[i])) return true;
            }
            return false;

        case ':minLength':
            return val.length >= arg;

        case ':maxLength':
            return val.length <= arg;

        case ':length':
            if (typeof arg !== 'object') {
                arg = [arg, arg];
            }
            return (arg[0] === null || val.length >= arg[0]) && (arg[1] === null || val.length <= arg[1]);

        case ':email':
            return /^[^@\s]+@[^@\s]+\.[a-z]{2,10}$/i.test(val);

        case ':url':
            return /^.+\.[a-z]{2,6}(\/.*)?$/i.test(val);

        case ':regexp':
            var parts = arg.match(/^\/(.*)\/([imu]*)$/);
            if (parts) try {
                return (new RegExp(parts[1], parts[2].replace('u', ''))).test(val);
            } catch (e) {}
            return;

        case ':integer':
            return /^-?[0-9]+$/.test(val);

        case ':float':
            return /^-?[0-9]*[.,]?[0-9]+$/.test(val);

        case ':range':
            return (arg[0] === null || parseFloat(val) >= arg[0]) && (arg[1] === null || parseFloat(val) <= arg[1]);

        case ':submitted':
            return elem.form['nette-submittedBy'] === elem.name;
    }
    return null;
};


Nette.toggleForm = function(form) {
    for (var i = 0; i < form.elements.length; i++) {
        if (form.elements[i].nodeName.toLowerCase() in {
            input:1,
            select:1,
            textarea:1,
            button:1
        }) {
            Nette.toggleControl(form.elements[i]);
        }
    }
};


Nette.toggleControl = function(elem, rules, firsttime) {
    rules = rules || eval('[' + (elem.getAttribute('data-nette-rules') || '') + ']');
    var has = false;
    for (var id in rules) {
        var rule = rules[id];
        var op;
        if(rule.op){
            op = rule.op.match(/(~)?([^?]+)/);
        } else {
            op = "";
        }
        rule.neg = op[1];
        rule.op = op[2];
        rule.condition = !!rule.rules;
        if (!rule.condition) continue;

        var el = rule.control ? elem.form.elements[rule.control] : elem;
        var success = Nette.validateRule(el, rule.op, rule.arg);
        if (success === null) continue;
        if (rule.neg) success = !success;

        if (Nette.toggleControl(elem, rule.rules, firsttime) || rule.toggle) {
            has = true;
            if (firsttime) {
                if (!el.nodeName) { // radio
                    for (var i in el) {
                        Nette.addEvent(el[i], 'click', function() {
                            Nette.toggleForm(elem.form);
                        });
                    }
                } else if (el.nodeName.toLowerCase() === 'select') {
                    Nette.addEvent(el, 'change', function() {
                        Nette.toggleForm(elem.form);
                    });
                } else {
                    Nette.addEvent(el, 'click', function() {
                        Nette.toggleForm(elem.form);
                    });
                }
            }
            for (var id in rule.toggle || []) {
                Nette.toggle(id, success ? rule.toggle[id] : !rule.toggle[id]);
            }
        }
    }
    return has;
};


Nette.toggle = function(id, visible) {
    var elem = document.getElementById(id);
    if (elem) {
        elem.style.display = visible ? "" : "none";
    }
};


Nette.initForm = function(form) {
    Nette.addEvent(form, 'submit', function() {
        return Nette.validateForm(form);
    });

    Nette.addEvent(form, 'click', function(e) {
        e = e || event;
        var target = e.target || e.srcElement;
        form['nette-submittedBy'] = (target.type in {
            submit:1,
            image:1
        }) ? target.name : null;
    });

    for (var i = 0; i < form.elements.length; i++) {
        Nette.toggleControl(form.elements[i], null, true);
    }

    if (/MSIE/.exec(navigator.userAgent)) {
        var labels = {};
        for (i = 0, elms = form.getElementsByTagName('label'); i < elms.length; i++) {
            labels[elms[i].htmlFor] = elms[i];
        }

        for (i = 0, elms = form.getElementsByTagName('select'); i < elms.length; i++) {
            Nette.addEvent(elms[i], 'mousewheel', function() {
                return false
            }); // prevents accidental change in IE
            if (labels[elms[i].htmlId]) {
                Nette.addEvent(labels[elms[i].htmlId], 'click', function() {
                    document.getElementById(this.htmlFor).focus();
                    return false
                }); // prevents deselect in IE 5 - 6
            }
        }
    }
};


Nette.addEvent(window, 'load', function () {
    for (var i = 0; i < document.forms.length; i++) Nette.initForm(document.forms[i]);
});