function RECONNECT() {
    if(SOCKET === null) {
        console.log("Websocket connecting..");
        SOCKET = new WebSocket("wss://omen.kirisame.com:38612");
        SOCKET.binaryType = "arraybuffer";
        SOCKET.addEventListener("error", (event) => {
            SOCKET = null;
            LOAD_STACK(SCENES.Offline);
        });
        SOCKET.addEventListener("open", (event) => {
            if(SOCKET.readyState === WebSocket.OPEN) {
                console.log("Websocket connected.");

                SOCKET.addEventListener("message", MESSAGE);

                SOCKET.addEventListener("close", (event) => {
                    console.log("Websocket closed.");
                    SOCKET = null;
                    RECONNECT();
                });

                RESUME();
            }
        });
    } else {
        RESUME();
    }
}

function RESUME() {
    if(CONTEXT.Auth !== null) {
        MESSAGE_COMPOSE([
            CONTEXT.Auth.token,
            CONTEXT.Auth.secret,
        ]);
    } else {
        LOAD(CONTEXT.Scene);
    }
}

function MESSAGE(event) {
    console.log("Message received.");

    if(SCENE.message !== undefined) {
        let bytes = new Uint8Array(event.data);
        let code = 0;
        let index = 2;
        let data = null;
        let result = null;

        if(bytes.length >= 2) {
            code = (bytes[0] << 8) + bytes[1];
        }

        switch(code) {
            case OpCode.Register: {
                console.log("RECV Register");

                if(bytes.length - index == 26) {
                    data = {
                        status:(bytes[2] << 8) + bytes[3],
                        token:new Uint8Array(8),
                        secret:new Uint8Array(16),
                    };
                    index += 2;

                    for(let i = 0; i < 8; ++i) {
                        data.token[i] = bytes[index++];
                    }
                    for(let i = 0; i < 16; ++i) {
                        data.secret[i] = bytes[index++];
                    }
                } else {
                    console.error("Register packet bad length:" + bytes.length);
                    return;
                }
            } break;

            case OpCode.Authenticate: {
                console.log("RECV Authenticate");

                if(bytes.length - index == 26) {
                    data = {
                        status:(bytes[2] << 8) + bytes[3],
                        token:new Uint8Array(),
                        secret:new Uint8Array(),
                    };
                    index += 2;

                    for(let i = 0; i < 8; ++i) {
                        data.token += bytes[index++];
                    }
                    for(let i = 0; i < 16; ++i) {
                        data.secret += bytes[index++];
                    }
                } else {
                    console.error("Authenticate packet bad length:" + bytes.length);
                    return;
                }
            } break;

            case OpCode.Resume: {
                console.log("RECV Resume");

                result = UNPACK.u16(bytes, index);
                index = result.index;
                if(result.data != Status.Ok) {
                    CONTEXT.Auth = null;
                }

                LOAD(CONTEXT.Scene);
            } break;

            case OpCode.Deauthenticate: {
                console.log("RECV Deauthenticate");
            } break;

            case OpCode.SessionList: {
                console.log("RECV Session list");

                if(bytes.length - index >= 2) {
                    data = {
                        records: [],
                    };

                    result = UNPACK.u16(bytes, index);
                    index = result.index;
                    let count = result.data;

                    for(let i = 0; i < count; ++i) {
                        let record = {
                            token: new Uint8Array(8),
                            dawn: "",
                            dusk: "",
                            turn: 0,
                            move: "",
                            viewers: 0,
                            player: false,
                        };

                        if(index <= bytes.length + 8) {
                            for(let i = 0; i < 8; ++i) {
                                record.token[i] = bytes[index];
                                index += 1;
                            }
                        }

                        result = UNPACK.string(bytes, index);
                        index = result.index;
                        record.dawn = result.data;

                        result = UNPACK.string(bytes, index);
                        index = result.index;
                        record.dusk = result.data;

                        result = UNPACK.u16(bytes, index);
                        index = result.index;
                        record.turn = result.data;

                        if(index <= bytes.length + 5) {
                            let move = new Uint8Array(5);
                            for(let i = 0; i < 5; ++i) {
                                move[i] = bytes[index];
                                index += 1;
                            }
                            record.move = UNPACK.move(move);
                        }

                        result = UNPACK.u32(bytes, index);
                        index = result.index;
                        record.viewers = result.data;

                        record.player = bytes[index++] != 0;

                        data.records.push(record);
                    }
                }
            } break;

            case OpCode.SessionCreate:
            case OpCode.SessionJoin: {
                if(bytes.length - index == 11) {
                    data = {
                        token:new Uint8Array(8),
                        mode:2,
                    };

                    let result = UNPACK.u16(data, index);
                    index = result.index;
                    let status = result.data;

                    result = UNPACK.u8(data, index);
                    index = result.index;
                    data.mode = result.data;

                    for(let i = 0; i < 8; ++i) { data.token[i] = data[index++]; }

                    if(status == Status.Ok) {
                        LOAD(SCENES.Game);
                    }
                }
            } break;

            default:
                return;
        }

        if(SCENE.message !== undefined) { SCENE.message(code, data) };
    }
}

function MESSAGE_COMPOSE(data) {
    if(SOCKET !== null) {
        let length = 0;
        for(let i = 0; i < data.length; ++i) {
            length += data[i].length;
        }

        let raw = new Uint8Array(length);
        length = 0;
        for(let i = 0; i < data.length; ++i) {
            raw.set(data[i], length);
            length += data[i].length;
        }

        SOCKET.send(raw);
    }
}

function MESSAGE_SESSION_LIST(page, game_state, is_player, is_live) {
    let flags = 0;
    flags |= game_state;
    flags |= +is_player << 2;
    flags |= +is_live << 3;

    MESSAGE_COMPOSE([
        PACK.u16(OpCode.SessionList),
        PACK.u16(flags),
        PACK.u16(page),
    ]);
}

function MESSAGE_SESSION_START() {
    MESSAGE_COMPOSE([
        PACK.u16(OpCode.SessionCreate),
    ]);
}

function MESSAGE_SESSION_JOIN(token, player) {
    MESSAGE_COMPOSE([
        PACK.u16(OpCode.SessionJoin),
        token,
        PACK.u8(player),
    ]);
}