type MessageTypes = "u2f_register_request" | "u2f_sign_request" |
    "u2f_register_response" | "u2f_sign_response";

export interface Request {
    type: MessageTypes;
    signRequests: SignRequest[];
    registerRequests?: RegisterRequest[];
    timeoutSeconds?: number;
    requestId?: number;
}

type ResponseData = Error | RegisterResponse | SignResponse;


export interface Response {
    type: MessageTypes;
    responseData: ResponseData;
    requestId?: number;
}

export enum ErrorCodes {
    "OK" = 0,
    "OTHER_ERROR" = 1,
    "BAD_REQUEST" = 2,
    "CONFIGURATION_UNSUPPORTED" = 3,
    "DEVICE_INELIGIBLE" = 4,
    "TIMEOUT" = 5
}

export interface Error {
    errorCode: ErrorCodes;
    errorMessage?: string;
}

export interface RegisterResponse {
    registrationData: string;
    clientData: string;
}

export interface RegisterRequest {
    version: string;
    challenge: string;
}

export interface SignResponse {
    keyHandle: string;
    signatureData: string;
    clientData: string;
}

export interface SignRequest {
    version: string;
    challenge: string;
    keyHandle: string;
    appId: string;
}

export interface RegisteredKey {
    version: string,
    keyHandle: string,
    transports?: any,
    appId?: string
}

export interface U2fApi {
    sign(appId: string, challenge: string, registeredKeys: RegisteredKey[],
        cb: (res: SignResponse | Error) => void, timeout: number): void;

    register(appId: string, registerRequests: RegisterRequest[],
        registeredKeys: RegisteredKey[],
        cb: (res: RegisterResponse | Error) => void,
        timeout: number): void;
}