/**
 * Adds select all/none links to the top of the backup/restore/import schema page.
 *
 * @module moodle-backup-backupselectall
 */

// Namespace for the backup
M.core_backup = M.core_backup || {};

/**
 * Adds select all/none links to the top of the backup/restore/import schema page.
 *
 * @class M.core_backup.backupselectall
 */
M.core_backup.backupselectall = function(modnames) {
    var formid = null;

    var helper = function(e, check, type, mod) {
        e.preventDefault();
        var prefix = '';
        if (typeof mod !== 'undefined') {
            prefix = 'setting_activity_' + mod + '_';
        }

        var len = type.length;
        Y.all('input[type="checkbox"]').each(function(checkbox) {
            var name = checkbox.get('name');
            // If a prefix has been set, ignore checkboxes which don't have that prefix.
            if (prefix && name.substring(0, prefix.length) !== prefix) {
                return;
            }
            if (name.substring(name.length - len) === type) {
                checkbox.set('checked', check);
            }
        });

        // At this point, we really need to persuade the form we are part of to
        // update all of its disabledIf rules. However, as far as I can see,
        // given the way that lib/form/form.js is written, that is impossible.
        if (formid && M.form) {
            M.form.updateFormState(formid);
        }
    };

    var html_generator = function(classname, idtype, heading, extra) {
        if (typeof extra === 'undefined') {
            extra = '';
        }
        return '<div class="' + classname + '">' +
                    '<div class="fitem fitem_fcheckbox backup_selector">' +
                        '<div class="fitemtitle">' + heading + '</div>' +
                        '<div class="felement">' +
                            '<a id="backup-all-' + idtype + '" href="#">' + M.util.get_string('all', 'moodle') + '</a> / ' +
                            '<a id="backup-none-' + idtype + '" href="#">' + M.util.get_string('none', 'moodle') + '</a>' +
                            extra +
                        '</div>' +
                    '</div>' +
                '</div>';
    };

    var firstsection = Y.one('fieldset#id_coursesettings .fcontainer.clearfix .grouped_settings.section_level');
    if (!firstsection) {
        // This is not a relevant page.
        return;
    }
    if (!firstsection.one('.felement.fcheckbox')) {
        // No checkboxes.
        return;
    }

    formid = firstsection.ancestor('form').getAttribute('id');

    var withuserdata = false;
    Y.all('input[type="checkbox"]').each(function(checkbox) {
        var name = checkbox.get('name');
        if (name.substring(name.length - 9) === '_userdata') {
            withuserdata = '_userdata';
        } else if (name.substring(name.length - 9) === '_userinfo') {
            withuserdata = '_userinfo';
        }
    });

    // Add global select all/none options.
    var html = html_generator('include_setting section_level', 'included', M.util.get_string('select', 'moodle'),
            ' (<a id="backup-bytype" href="#">' + M.util.get_string('showtypes', 'backup') + '</a>)');
    if (withuserdata) {
        html += html_generator('normal_setting', 'userdata', M.util.get_string('select', 'moodle'));
    }
    var links = Y.Node.create('<div class="grouped_settings section_level">' + html + '</div>');
    firstsection.insert(links, 'before');

    // Add select all/none for each module type.
    var initlinks = function(links, mod) {
        Y.one('#backup-all-mod_' + mod).on('click', function(e) { helper(e, true, '_included', mod); });
        Y.one('#backup-none-mod_' + mod).on('click', function(e) { helper(e, false, '_included', mod); });
        if (withuserdata) {
            Y.one('#backup-all-userdata-mod_' + mod).on('click', function(e) { helper(e, true, withuserdata, mod); });
            Y.one('#backup-none-userdata-mod_' + mod).on('click', function(e) { helper(e, false, withuserdata, mod); });
        }
    };

    // For each module type on the course, add hidden select all/none options.
    var modlist = Y.Node.create('<div id="mod_select_links">');
    modlist.hide();
    modlist.currentlyshown = false;
    links.appendChild(modlist);
    for (var mod in modnames) {
        // Only include actual values from the list.
        if (!modnames.hasOwnProperty(mod)) {
            continue;
        }
        html = html_generator('include_setting section_level', 'mod_' + mod, modnames[mod]);
        if (withuserdata) {
            html += html_generator('normal_setting', 'userdata-mod_' + mod, modnames[mod]);
        }
        var modlinks = Y.Node.create(
            '<div class="grouped_settings section_level">' + html + '</div>');
        modlist.appendChild(modlinks);
        initlinks(modlinks, mod);
    }

    // Toggles the display of the hidden module select all/none links.
    var toggletypes = function() {
        // Change text of type toggle link.
        var link = Y.one('#backup-bytype');
        if (modlist.currentlyshown) {
            link.setHTML(M.util.get_string('showtypes', 'backup'));
        } else {
            link.setHTML(M.util.get_string('hidetypes', 'backup'));
        }

        // The link has now been toggled (from show to hide, or vice-versa).
        modlist.currentlyshown = !modlist.currentlyshown;

        // Either hide or show the links.
        var animcfg = { node: modlist, duration: 0.2 },
            anim;
        if (modlist.currentlyshown) {
            // Animate reveal of the module links.
            modlist.show();
            animcfg.to = { maxHeight: modlist.get('clientHeight') + 'px' };
            modlist.setStyle('maxHeight', '0px');
            anim = new Y.Anim(animcfg);
            anim.on('end', function() { modlist.setStyle('maxHeight', 'none'); });
            anim.run();
        } else {
            // Animate hide of the module links.
            animcfg.to = { maxHeight: '0px' };
            modlist.setStyle('maxHeight', modlist.get('clientHeight') + 'px');
            anim = new Y.Anim(animcfg);
            anim.on('end', function() { modlist.hide(); modlist.setStyle('maxHeight', 'none'); });
            anim.run();
        }

    };
    Y.one('#backup-bytype').on('click', function() { toggletypes(); });

    Y.one('#backup-all-included').on('click',  function(e) { helper(e, true,  '_included'); });
    Y.one('#backup-none-included').on('click', function(e) { helper(e, false, '_included'); });
    if (withuserdata) {
        Y.one('#backup-all-userdata').on('click',  function(e) { helper(e, true,  withuserdata); });
        Y.one('#backup-none-userdata').on('click', function(e) { helper(e, false, withuserdata); });
    }
};
