/*
    @Packet name                GuildDataMemberChanged
    @Packet identifier          193
    @Description                Holds data about a single guild member's changed properties
    @Data                       -
    @Structure                  -
*/

const encoder = new TextEncoder();

module.exports = function (data) {
    const packetLength = 5 + 1 + 1 + 
    ("isOnline" in data ? 1 : 0) + 
    ("permission" in data ? 4 : 0) + 
    ("level" in data ? 2 : 0) + 
    ("name" in data ? 1 + data.name.length : 0);
    const buffer = new ArrayBuffer(packetLength);
    const view = new DataView(buffer);

    let offset = 6;
    let mask = 0;
    console.info(packetLength, "isOnline" in data, "permission" in data, "level" in data, "name" in data)
    if ("isOnline" in data) {
        mask |= (1 << 0);
        view.setUint8(offset + 1, data.isOnline);

        offset += 1;
    };

    if ("permission" in data) {
        mask |= (1 << 1);
        view.setUint32(offset + 1, data.permission);

        offset += 4;
    };

    if ("level" in data) {
        mask |= (1 << 2);
        view.setUint16(offset + 1, data.level);

        offset += 2;
    };

    if ("name" in data) {
        mask |= (1 << 3);

        const nameBuffer = encoder.encode(data.name);
        view.setUint8(offset + 1, nameBuffer.byteLength);
        new Uint8Array(buffer, offset + 2).set(nameBuffer);

        offset += 1 + nameBuffer.byteLength;
    };
    
    view.setUint8(0, 193);
    view.setUint8(1, packetLength);
    view.setUint8(2, mask);
    view.setUint32(3, data.id);

    return buffer;
};