/**
 * toggle visibility of an element by its id
 * & set current visibility status in a cookie
 * XXX whenever used outside of preferences, don't forget to
 *     move me in a more appropriate place
 */

var prefsValues = {};

function togglePrefVisibility(elemId) {
    clearPreviousMessages();
    jQuery('#' + elemId).toggleClass('hidden');
}

function closeFieldset(fieldsetid) {
    var linklabel = _('open all');
    var linkhref = 'javascript:openFieldset("' + fieldsetid + '")';
    _toggleFieldset(fieldsetid, 1, linklabel, linkhref);
}

function openFieldset(fieldsetid) {
    var linklabel = _('close all');
    var linkhref = 'javascript:closeFieldset("' + fieldsetid + '")';
    _toggleFieldset(fieldsetid, 0, linklabel, linkhref);
}

function _toggleFieldset(fieldsetid, closeaction, linklabel, linkhref) {
    jQuery('#' + fieldsetid).find('div.openlink').each(function() {
        var link = A({
            'href': "javascript:noop();",
            'onclick': linkhref
        },
        linklabel);
        jQuery(this).empty().append(link);
    });
    jQuery('#' + fieldsetid).find('fieldset[id]').each(function() {
        var fieldset = jQuery(this);
        if (closeaction) {
            fieldset.addClass('hidden');
        } else {
            fieldset.removeClass('hidden');
            linkLabel = (_('open all'));
        }
    });
}

function validatePrefsForm(formid) {
    clearPreviousMessages();
    clearPreviousErrors(formid);
    return validateForm(formid, null, submitSucces, submitFailure);
}

function submitFailure(formid) {
    var form = jQuery('#' + formid);
    var dom = DIV({
        'class': 'critical'
    },
    _("please correct errors below"));
    jQuery(form).find('div.formsg').empty().append(dom);
    // clearPreviousMessages()
    jQuery(form).find('span.error').next().focus();
}

function submitSucces(url, formid) {
    var form = jQuery('#' + formid);
    setCurrentValues(form);
    var dom = DIV({
        'class': 'msg'
    },
    _("changes applied"));
    jQuery(form).find('div.formsg').empty().append(dom);
    jQuery(form).find('input').removeClass('changed');
    checkValues(form, true);
    return;
}

function clearPreviousMessages() {
    jQuery('div#appMsg').addClass('hidden');
    jQuery('div.formsg').empty();
}

function clearPreviousErrors(formid) {
    jQuery('#err-value:' + formid).remove();
}

function checkValues(form, success) {
    var unfreezeButtons = false;
    jQuery(form).find('select').each(function() {
        unfreezeButtons = _checkValue(jQuery(this), unfreezeButtons);
    });
    jQuery(form).find('[type=text]').each(function() {
        unfreezeButtons = _checkValue(jQuery(this), unfreezeButtons);
    });
    jQuery(form).find('input[type=radio]:checked').each(function() {
        unfreezeButtons = _checkValue(jQuery(this), unfreezeButtons);
    });

    if (unfreezeButtons) {
        unfreezeFormButtons(form.attr('id'));
    } else {
        if (!success) {
            clearPreviousMessages();
        }
        clearPreviousErrors(form.attr('id'));
        freezeFormButtons(form.attr('id'));
    }
}

function _checkValue(input, unfreezeButtons) {
    var currentValue = prefsValues[input.attr('name')];
    if (currentValue != input.val()) {
        input.addClass('changed');
        unfreezeButtons = true;
    } else {
        input.removeClass('changed');
        jQuery("span[id=err-" + input.attr('id') + "]").remove();
    }
    input.removeClass('error');
    return unfreezeButtons;
}

function setCurrentValues(form) {
    jQuery(form).find('[name^=value]').each(function() {
        var input = jQuery(this);
        var name = input.attr('name');
        if (input.attr('type') == 'radio') {
            // NOTE: there seems to be a bug with jQuery(input).attr('checked')
            //       in our case, we can't rely on its value, we use
            //       the DOM API instead.
            if (input[0].checked) {
                prefsValues[name] = input.val();
            }
        } else {
            prefsValues[name] = input.val();
        }
        jQuery(form).find('input[name=edits-' + name + ']').val(prefsValues[name]);
    });
}

function initEvents() {
    jQuery('form').each(function() {
        var form = jQuery(this);
        //freezeFormButtons(form.attr('id'));
        form.find('.validateButton').attr('disabled', 'disabled');
        form.find('input[type=text]').keyup(function() {
            checkValues(form);
        });
        form.find('input[type=radio]').change(function() {
            checkValues(form);
        });
        form.find('select').change(function() {
            checkValues(form);
        });
        setCurrentValues(form);
    });
}

$(document).ready(function() {
    initEvents();
});