// http://www.x.org/releases/X11R7.6/doc/xextproto/shape.pdf

var x11 = Require('x11/core/x11');
// TODO: move to templates

exports.requireExt = function(display, callback)
{
        function captureStack()
        {
            var err = new Error;
            //err.name = reqName;
            Error.captureStackTrace(err, arguments.callee);
            display.client.seq2stack[display.client.seq_num] = err.stack;
        }

    var X = display.client;
    X.QueryExtension('SHAPE', function(err, ext) {

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

        ext.Kind = {
            Bounding: 0,
            Clip: 1,
            Input: 2
        };

        ext.Op = {
            Set: 0,
            Union: 1,
            Intersect: 2,
            Subtract: 3,
            Invert: 4
        };

        ext.Ordering = {
            Unsorted: 0,
            YSorted: 1,
            YXSorted: 2,
            YXBanded: 3
        };

        ext.QueryVersion = function(cb)
        {
            X.seq_num++;
//            captureStack();
            X.pack_stream.pack('CCSLL', [ext.majorOpcode, 0, 1]);
            X.replies[X.seq_num] = [
                function(buf, opt) {
                    var res = buf.unpack('SS');
                    return res;
                },
                cb
            ];
            X.pack_stream.flush();
        }

        // Accepts rectangles as [[x, y, width, height]]
        ext.Rectangles = function( op, kind, window, x, y, rectangles, ordering /* = Ordering.Unsorted */ )
        {
            if (ordering === undefined)
                ordering = ext.Ordering.Unsorted;

            var length = 4 + rectangles.length * 2;

            X.seq_num++;
//            captureStack();
            X.pack_stream.pack('CCSCCCxLss', [ext.majorOpcode, 1, length, op, kind, ordering, window, x, y]);
            for (var i = 0; i < rectangles.length; ++i) {
                var r = rectangles[i];
                X.pack_stream.pack('ssSS', r);
            }
            X.pack_stream.flush();
        }

        ext.Mask = function( op, kind, window, x, y, bitmap )
        {
            X.seq_num++;
//            captureStack();
            X.pack_stream.pack('CCSCCxxLssL', [ext.majorOpcode, 2, 5, op, kind, window, x, y, bitmap]);
            X.pack_stream.flush();
        }

        ext.SelectInput = function( window, enable )
        {
            X.seq_num++;
//            captureStack();
            X.pack_stream.pack('CCSLCxxx', [ext.majorOpcode, 6, 3, window, enable ]);
            X.pack_stream.flush();
        }

        ext.InputSelected = function( window, cb )
        {
            X.seq_num++;
//            captureStack();
            X.pack_stream.pack('CCSL', [ext.majorOpcode, 7, 2, window ]);
            X.replies[X.seq_num] = [
                function(buf, opt) {
                    return opt;
                },
                cb
            ];
            X.pack_stream.flush();
        }

        callback(null, ext);

        /*
        ext.QueryVersion(function(err, version) {
            ext.major = version[0];
            ext.minor = version[1];
            callback(null, ext);
        });
        */

        ext.events = {
            ShapeNotify: 0
        }

        X.eventParsers[ext.firstEvent + ext.events.ShapeNotify] = function(type, seq, extra, code, raw)
        {
            var event = {};
            event.type = type;
            event.kind = code;
            event.seq = seq;

            event.window = extra;

            var values = raw.unpack('ssSSLC');

            event.x = values[0];
            event.y = values[1];
            event.width = values[2];
            event.height = values[3];
            event.time = values[4];
            event.shaped = values[5];
            event.name = 'ShapeNotify';

            return event;
        };
    });
}