import {AbstractCommandHandler, AbstractCommandHandlerBoss} from "tc-shared/connection/AbstractCommandHandler";
import {
    AbstractServerConnection,
    CommandOptionDefaults,
    CommandOptions,
    ConnectionStateListener,
    ServerCommand
} from "tc-shared/connection/ConnectionBase";
import {CommandResult} from "tc-shared/connection/ServerConnectionDeclaration";
import {tr} from "tc-shared/i18n/localize";
import {ConnectionHandler, ConnectionState, DisconnectReason} from "tc-shared/ConnectionHandler";
import {
    destroy_server_connection as destroy_native_server_connection,
    NativeServerConnection,
    ServerType,
    spawn_server_connection as spawn_native_server_connection
} from "tc-native/connection";
import {ConnectionCommandHandler} from "tc-shared/connection/CommandHandler";
import {HandshakeHandler} from "tc-shared/connection/HandshakeHandler";
import {ServerAddress} from "tc-shared/ui/server";
import {TeaSpeakHandshakeHandler} from "tc-shared/profiles/identities/TeamSpeakIdentity";
import {VoiceConnection} from "./VoiceConnection";
import {AbstractVoiceConnection} from "tc-shared/connection/VoiceConnection";
import {LogCategory, logDebug, logWarn} from "tc-shared/log";
import {ErrorCode} from "tc-shared/connection/ErrorCode";

interface ErrorCodeListener {
    callback: (result: CommandResult) => void;
    code: string;

    command: string;
    timeout: number;
}

class ErrorCommandHandler extends AbstractCommandHandler {
    private readonly handle: ServerConnection;

    private errorCodeMapping: {[key: string]: ErrorCodeListener} = {};
    private errorCodeHistory: ErrorCodeListener[] = [];

    private errorCodeIndex = 0;

    constructor(handle: ServerConnection) {
        super(handle);
        this.handle = handle;
    }

    generateReturnCode(command: string, callback: (result: CommandResult) => void) : string {
        const listener = {
            callback: callback,
            code: "rt-" + (++this.errorCodeIndex),
            timeout: 0,
            command: command
        } as ErrorCodeListener;

        listener.timeout = setTimeout(() => {
            delete this.errorCodeMapping[listener.code];
            const index = this.errorCodeHistory.indexOf(listener);
            if(index !== -1) {
                this.errorCodeHistory.splice(index, 1);
            }

            logWarn(LogCategory.NETWORKING, tr("Command %s timeout out."), command);
            callback(new CommandResult([{ id: ErrorCode.COMMAND_TIMED_OUT, msg: "timeout" }]));
        }, 5000) as any;

        this.errorCodeMapping[listener.code] = listener;
        this.errorCodeHistory.push(listener);

        return listener.code;
    }

    handle_command(command: ServerCommand): boolean {
        if(command.command === "error") {
            const data = command.arguments[0];

            const returnCode = data["return_code"];
            let codeListener: ErrorCodeListener;

            if(!returnCode) {
                const [ code ] = this.errorCodeHistory.splice(0, 1);
                if(!code) {
                    logWarn(LogCategory.NETWORKING, tr("Received error without a return code and we're not expecting an error."));
                    return true;
                }
                logDebug(LogCategory.NETWORKING, tr("Received error without any error code. Using the first send command %s (%s)"), code.command, code.code);

                codeListener = code;
            } else {
                let code = this.errorCodeMapping[returnCode];
                if(!code) {
                    logWarn(LogCategory.NETWORKING, tr("Received error for invalid return code %s"), returnCode);
                    return true;
                }

                const index = this.errorCodeHistory.indexOf(code);
                if(index !== -1) this.errorCodeHistory.splice(index, 1);

                codeListener = code;
            }

            delete this.errorCodeMapping[codeListener.code];
            clearTimeout(codeListener.timeout);

            codeListener.callback(new CommandResult(command.arguments));
            return true;
        } else if(command.command == "initivexpand") {
            if(command.arguments[0]["teaspeak"] == true) {
                console.log("Using TeaSpeak identity type");
                this.handle.handshake_handler().startHandshake();
            }
            return true;
        } else if(command.command == "initivexpand2") {
            /* its TeamSpeak or TeaSpeak with experimental 3.1 and not up2date */
            this.handle["_do_teamspeak"] = true;
        } else if(command.command == "initserver") {
            /* just if clientinit error did not fired (TeamSpeak) */
            while(this.errorCodeHistory.length > 0) {
                const listener = this.errorCodeHistory.pop();
                listener.callback(new CommandResult([{id: 0, message: ""}]));
                clearTimeout(listener.timeout);
            }

            this.errorCodeMapping = {};
        } else if(command.command == "notifyconnectioninforequest") {
            this.handle.send_command("setconnectioninfo",
                {
                    //TODO calculate
                    connection_ping: 0.0000,
                    connection_ping_deviation: 0.0,

                    connection_packets_sent_speech: 0,
                    connection_packets_sent_keepalive: 0,
                    connection_packets_sent_control: 0,
                    connection_bytes_sent_speech: 0,
                    connection_bytes_sent_keepalive: 0,
                    connection_bytes_sent_control: 0,
                    connection_packets_received_speech: 0,
                    connection_packets_received_keepalive: 0,
                    connection_packets_received_control: 0,
                    connection_bytes_received_speech: 0,
                    connection_bytes_received_keepalive: 0,
                    connection_bytes_received_control: 0,
                    connection_server2client_packetloss_speech: 0.0000,
                    connection_server2client_packetloss_keepalive: 0.0000,
                    connection_server2client_packetloss_control: 0.0000,
                    connection_server2client_packetloss_total: 0.0000,
                    connection_bandwidth_sent_last_second_speech: 0,
                    connection_bandwidth_sent_last_second_keepalive: 0,
                    connection_bandwidth_sent_last_second_control: 0,
                    connection_bandwidth_sent_last_minute_speech: 0,
                    connection_bandwidth_sent_last_minute_keepalive: 0,
                    connection_bandwidth_sent_last_minute_control: 0,
                    connection_bandwidth_received_last_second_speech: 0,
                    connection_bandwidth_received_last_second_keepalive: 0,
                    connection_bandwidth_received_last_second_control: 0,
                    connection_bandwidth_received_last_minute_speech: 0,
                    connection_bandwidth_received_last_minute_keepalive: 0,
                    connection_bandwidth_received_last_minute_control: 0
                }
            );
        }
        return false;
    }
}

export class ServerConnection extends AbstractServerConnection {
    private _native_handle: NativeServerConnection;
    private readonly _voice_connection: VoiceConnection;

    private _do_teamspeak: boolean;

    private readonly _command_handler: NativeConnectionCommandBoss;
    private readonly _command_error_handler: ErrorCommandHandler;
    private readonly _command_handler_default: ConnectionCommandHandler;

    private _remote_address: ServerAddress;
    private _handshake_handler: HandshakeHandler;

    onconnectionstatechanged: ConnectionStateListener;

    constructor(props: ConnectionHandler) {
        super(props);

        this._command_handler = new NativeConnectionCommandBoss(this);
        this._command_error_handler = new ErrorCommandHandler(this);
        this._command_handler_default = new ConnectionCommandHandler(this);

        this._command_handler.register_handler(this._command_error_handler);
        this._command_handler.register_handler(this._command_handler_default);

        this._native_handle = spawn_native_server_connection();
        this._native_handle.callback_disconnect = reason => {
            this.client.handleDisconnect(DisconnectReason.CONNECTION_CLOSED, {
                reason: reason
            });
        };
        this._native_handle.callback_command = (command, args, switches) => {
            console.log("Received: %o %o %o", command, args, switches);
            //FIXME catch error

            this._command_handler.invoke_handle({
                command: command,
                arguments: args
            });
        };
        this._voice_connection = new VoiceConnection(this, this._native_handle._voice_connection);

        this.command_helper.initialize();
        this._voice_connection.setup();
    }

    native_handle() : NativeServerConnection {
        return this._native_handle;
    }

    finalize() {
        if(this._native_handle)
            destroy_native_server_connection(this._native_handle);
        this._native_handle = undefined;
    }

    connect(address: ServerAddress, handshake: HandshakeHandler, timeout?: number): Promise<void> {
        this.updateConnectionState(ConnectionState.CONNECTING);

        this._remote_address = address;
        this._handshake_handler = handshake;
        this._do_teamspeak = false;
        handshake.setConnection(this);
        handshake.initialize();

        return new Promise<void>((resolve, reject) => {
            this._native_handle.connect({
                remote_host: address.host,
                remote_port: address.port,

                timeout: typeof(timeout) === "number" ? timeout : -1,


                callback: error => {
                    if(error != 0) {
                        /* required to notify the handle, just a promise reject does not work */
                        this.client.handleDisconnect(DisconnectReason.CONNECT_FAILURE, error);
                        this.updateConnectionState(ConnectionState.UNCONNECTED);
                        reject(this._native_handle.error_message(error));
                        return;
                    } else {
                        resolve();
                    }
                    this.updateConnectionState(ConnectionState.AUTHENTICATING);

                    console.log("Remote server type: %o (%s)", this._native_handle.server_type, ServerType[this._native_handle.server_type]);
                    if(this._native_handle.server_type == ServerType.TEAMSPEAK || this._do_teamspeak) {
                        console.log("Trying to use TeamSpeak's identity system");
                        this.handshake_handler().on_teamspeak();
                    }
                },

                identity_key: (handshake.get_identity_handler() as TeaSpeakHandshakeHandler).identity.private_key,
                teamspeak: false
            })
        });
    }


    remote_address(): ServerAddress {
        return this._remote_address;
    }

    handshake_handler(): HandshakeHandler {
        return this._handshake_handler;
    }

    connected(): boolean {
        return typeof(this._native_handle) !== "undefined" && this._native_handle.connected();
    }

    disconnect(reason?: string): Promise<void> {
        console.trace("Disconnect: %s",reason);
        return new Promise<void>((resolve, reject) => this._native_handle.disconnect(reason || "", error => {
            if(error == 0)
                resolve();
            else
                reject(this._native_handle.error_message(error));
        }));
    }

    support_voice(): boolean {
        return true;
    }

    getVoiceConnection(): AbstractVoiceConnection {
        return this._voice_connection;
    }

    command_handler_boss(): AbstractCommandHandlerBoss {
        return this._command_handler;
    }

    send_command(command: string, data?: any, _options?: CommandOptions): Promise<CommandResult> {
        if(!this.connected()) {
            console.warn(tr("Tried to send a command without a valid connection."));
            return Promise.reject(tr("not connected"));
        }

        const options: CommandOptions = {};
        Object.assign(options, CommandOptionDefaults);
        Object.assign(options, _options);

        data = Array.isArray(data) ? data : [data || {}];
        if(data.length == 0) { /* we require min one arg to append return_code */
            data.push({});
        }

        console.log("Send: %o %o", command, data);
        const promise = new Promise<CommandResult>((resolve, reject) => {
            data[0]["return_code"] = this._command_error_handler.generateReturnCode(command, result => {
                if(result.success) {
                    resolve(result);
                } else {
                    reject(result);
                }
            });

            try {
                this._native_handle.send_command(command, data, options.flagset || []);
            } catch(error) {
                reject(tr("failed to send command"));
                console.warn(tr("Failed to send command: %o"), error);
            }
        });
        return this._command_handler_default.proxy_command_promise(promise, options);
    }

    ping(): { native: number; javascript?: number } {
        return {
            native: this._native_handle ? (this._native_handle.current_ping() / 1000) : -2
        };
    }
}

export class NativeConnectionCommandBoss extends AbstractCommandHandlerBoss {
    constructor(connection: AbstractServerConnection) {
        super(connection);
    }
}