import Client from "./client";
/**
 * The potential states that a command can have.
 * When a command is created, the state is "initial"
 * When the execution has started, the status is "running"
 * When the execution has finsihed, the status can be "succes" or "failed"
 */
export declare enum CommandStatus {
    /**
     * When a command is created, the state is "initial"
     */
    initial = "initial",
    /**
     * When the execution has started, the status is "running"
     */
    running = "running",
    /**
     * After successful  execution of the command, the status is "success"
     */
    success = "success",
    /**
     * After unsuccessfull execution of the command, the status is "failed"
     */
    failed = "failed"
}
/**
 * when the command has finished, the client can get the result of the command execution
 */
export interface CommandResultMetaData {
    errors: string[];
    messages: string[];
    timeElapsed: number;
}
/**
 * The command class represents a potential long running activity.
 * This activity has been wrapped into an object to ease the tracking of the processing state.
 * Create a command with  receiver information, execute the command and check the status and progress.
 * Check the result when finsished.
 */
export default abstract class Command {
    protected client: Client;
    protected status: CommandStatus;
    protected percentCompleted: number;
    protected resultMetaData: CommandResultMetaData;
    constructor(client: Client);
    /**
     * final execute the command
     * @async
     * @final
     * @returns {Promise<void>}
     */
    execute(): Promise<void>;
    /**
     * execute the command
     * @async
     * @returns {Promise<void>}
     */
    protected abstract onExecute(): Promise<void>;
    /**
     * returns true, if the command has been finished
     * @returns {boolean}
     */
    isFinished(): boolean;
    /**
     * returns the status of the command
     * @returns {CommandStatus}
     */
    getStatus(): CommandStatus;
    /**
     * returns the completion percentage of the command
     * @returns {number} percentage of completion
     */
    getPercentCompleted(): number;
    /**
     * returns the result meta data of the command
     * @returns {null|any} the result of the command
     */
    getResultMetaData(): CommandResultMetaData;
}