/*
 * Copyright (c) 2010-2017 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#pragma once

#include <map>
#include <memory>
#include <string>

#include <boost/signals2.hpp>

#include <Swiften/Base/API.h>
#include <Swiften/Elements/Command.h>
#include <Swiften/Elements/ErrorPayload.h>
#include <Swiften/JID/JID.h>

namespace Swift {
    class IQRouter;

    class SWIFTEN_API OutgoingAdHocCommandSession {
        public:

            /**
             * Availability of action.
             */
            enum ActionState {
                Absent /** Action isn't applicable to this command. */ = 0,
                Present /** Action is applicable to this command */= 1,
                Enabled /** Action is applicable and currently available */ = 2,
                EnabledAndPresent = 3};

            OutgoingAdHocCommandSession(const JID& to, const std::string& commandNode, IQRouter* iqRouter);
            ~OutgoingAdHocCommandSession();
            /**
             * Send initial request to the target.
             */
            void start();
            /**
             * Cancel command session with the target.
             */
            void cancel();
            /**
             * Return to the previous stage.
             */
            void goBack();
            /**
             * Send the form to complete the command.
             * \param form Form for submission - if missing the command will be submitted with no form.
             */
            void complete(Form::ref form);
            /**
             * Send the form to advance to the next stage of the command.
             * \param form Form for submission - if missing the command will be submitted with no form.
             */
            void goNext(Form::ref form);

            /**
             * Is the form multi-stage?
             */
            bool getIsMultiStage() const;

            /**
             * Emitted when the form for the next stage is available.
             */
            boost::signals2::signal<void (Command::ref)> onNextStageReceived;

            /**
             * Emitted on error.
             */
            boost::signals2::signal<void (ErrorPayload::ref)> onError;

            /**
             * Get the state of a given action.
             * This is useful for a UI to determine which buttons should be visible,
             * and which enabled.
             * Use for Next, Prev, Cancel and Complete only.
             * If no actions are available, the command has completed.
             */
            ActionState getActionState(Command::Action action) const;

        private:
            void handleResponse(std::shared_ptr<Command> payload, ErrorPayload::ref error);
            void submitForm(Form::ref, Command::Action action);

        private:
            JID to_;
            std::string commandNode_;
            IQRouter* iqRouter_;
            bool isMultiStage_;
            std::string sessionID_;
            std::map<Command::Action, ActionState> actionStates_;
            boost::signals2::connection connection_;
    };
}