// http://www.x.org/releases/X11R7.6/doc/xextproto/dpms.txt

var x11 = Require('x11/core/x11');
// TODO: move to templates
exports.requireExt = function(display, callback)
{
    var X = display.client;
    X.QueryExtension('DPMS', function(err, ext) {

        if (!ext.present)
            return callback(new Error('extension not available'));

        ext.GetVersion = function(clientMaj, clientMin, callback)
        {
            X.seq_num++;
            X.pack_stream.pack('CCSSS', [ext.majorOpcode, 0, 2, clientMaj, clientMin]);
            X.replies[X.seq_num] = [
                function(buf, opt) {
                    var res = buf.unpack('SS');
                    return res;
                },
                callback
            ];
            X.pack_stream.flush();
        };

        ext.Capable = function(callback)
        {
            X.seq_num++;
            X.pack_stream.pack('CCS', [ext.majorOpcode, 1, 1]);
            X.replies[X.seq_num] = [
                function(buf, opt) {
                    var res = buf.unpack('C');
                    return res;
                },
                callback
            ];
            X.pack_stream.flush();
        };

        ext.GetTimeouts = function(callback)
        {
            X.seq_num++;
            X.pack_stream.pack('CCS', [ext.majorOpcode, 2, 1]);
            X.replies[X.seq_num] = [
                function(buf, opt) {
                    var res = buf.unpack('SSS');
                    return res;
                },
                callback
            ];
            X.pack_stream.flush();
        };

        ext.SetTimeouts = function(standby_t, suspend_t, off_t)
        {
            X.seq_num++;
            X.pack_stream.pack('CCSSSSxx', [ext.majorOpcode, 3, 3, standby_t, suspend_t, off_t]);
            X.pack_stream.flush();
        };

        ext.Enable = function()
        {
            X.seq_num++;
            X.pack_stream.pack('CCS', [ext.majorOpcode, 4, 1]);
            X.pack_stream.flush();
        };

        ext.Disable = function()
        {
            X.seq_num++;
            X.pack_stream.pack('CCS', [ext.majorOpcode, 5, 1]);
            X.pack_stream.flush();
        };

        ext.ForceLevel = function(level) // 0 : On, 1 : Standby, 2 : Suspend, 3 : Off
        {
            X.seq_num++;
            X.pack_stream.pack('CCSSxx', [ext.majorOpcode, 6, 2, level]);
            X.pack_stream.flush();
        };

        ext.Info = function(callback)
        {
            X.seq_num++;
            X.pack_stream.pack('CCS', [ext.majorOpcode, 7, 1]);
            X.replies[X.seq_num] = [
                function(buf, opt) {
                    var res = buf.unpack('SC');
                    return res;
                },
                callback
            ];
            X.pack_stream.flush();
        };

        callback(null, ext);
    });
};