/**
 * Nette Framework - simple form validation.
 *
 * @copyright  Copyright (c) 2004, 2010 David Grudl
 * @license    http://nette.org/license  Nette license
 * @link       http://nette.org
 */

var nette = nette || { };

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')) {
        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], op = rule.op.match(/(~)?([^?]+)/);
        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) {
                        el[i].onclick = function() { nette.toggleForm(elem.form); };
                    }
                } else if (el.nodeName.toLowerCase() === 'select') {
                    el.onchange = function() { nette.toggleForm(elem.form); };
                } else {
                    el.onclick = 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) {
    form.onsubmit = function() {
        return nette.validateForm(form);
    };

    form.onclick = 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++) {
            elms[i].onmousewheel = function() { return false };    // prevents accidental change in IE
            if (labels[elms[i].htmlId]) {
                labels[elms[i].htmlId].onclick = function() { document.getElementById(this.htmlFor).focus(); return false }; // prevents deselect in IE 5 - 6
            }
        }
    }
};


(function(){
    var init = function() {
        for (var i = 0; i < document.forms.length; i++) nette.initForm(document.forms[i]);
    };
    typeof jQuery === 'function' ? jQuery(init) : window.onload = init;
})();