/********************************************************************************
 * Copyright (c) 2025-2026 ZF Friedrichshafen AG
 *
 * This program and the accompanying materials are made available under the 
 * terms of the Apache License Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * SPDX-License-Identifier: Apache-2.0 
 ********************************************************************************/

#ifndef CONSOLE_OUTPUT_H
#define CONSOLE_OUTPUT_H

#include <iostream>
#include <string>
#include <functional>
#include <support/signal_support.h>
#include <support/app_control.h>
#include <support/component_impl.h>
#include <support/timer.h>
#include "../generated/vss_files/signal_identifier.h"

#include <fcntl.h>
#include "../generated/vss_files/vss_vehiclebodytrunk_vd_tx.h"
#include "../generated/vss_files/vss_vehiclebodytrunk_bs_tx.h"
#include "../generated/vss_files/vss_vehiclespeed_bs_rx.h"
#include "../generated/vss_files/vss_vehiclespeed_vd_rx.h"

// Complex service trunk interface - located in ../generated/trunk_service
//#include "trunkkit.h"

#ifdef __unix__
#include <termios.h>        // Needed for tcgetattr and fcntl
#include <unistd.h>
#endif

/**
 * @brief Console operation class.
 * @details This class retrieves RX data from the data dispatch service, vehicle device & basic service of speed on event change.
 * Furthermore, it shows TX value by polling the RX signals.
 */
class CConsole : public vss::Vehicle::SpeedDevice::IVSS_WriteSpeed_Event
    , public vss::Vehicle::SpeedService::IVSS_SetSpeed_Event
{
public:
    /**
     * @brief Screen position structure
     */
    struct SConsolePos
    {
        uint32_t uiRow;     ///< Row position (starts at 1)
        uint32_t uiCol;     ///< Column position (starts at 1)
    };

    /**
     * @brief Constructor
     */
    CConsole();

    /**
     * @brief Destructor
     */
    ~CConsole();

    /**
     * @brief Print the header.
     * @param[in] uiInstance Instance number the application will connect to. 0 will start a standalone application 
     */
    void PrintHeader(uint32_t uiInstance);

    /**
     * @brief Prepare the data consumers..
     * @return Returns whether the preparation of the data consumers was successful or not.
     */
    bool PrepareDataConsumers();

    /**
    * @brief Run loop as long as user input does not exit
    * Allow user to open/close trunk.
    */
    void RunUntilBreak();

    /**
     * @brief Write vehicleSpeed signal
     * @param[in] value vehicleSpeed
     */
    virtual void WriteSpeed(float value) override;

    /**
     * @brief Set vehicleSpeed signal
     * @param[in] value vehicleSpeed
     */
    virtual void SetSpeed(float value) override;

    /**
     * @brief For gracefully shutdown all signals need to be reset.
     */
    void ResetSignals();

private:
    /**
     * @brief Callback function for speed.
     * @param[in] value The value of the signal to update.
     */
    void CallbackSpeed(sdv::any_t value);

    /**
     * @brief Key hit check. Windows uses the _kbhit function; POSIX emulates this.
     * @return Returns whether a key has been pressed.
     */
    bool KeyHit();

    /**
     * @brief Get the character from the keyboard buffer if pressed.
     * @return Returns the character from the keyboard buffer.
     */
    char GetChar();

    /**
     * @brief Get the cursor position of the console.
     * @return The cursor position.
     */
    SConsolePos GetCursorPos() const;

    /**
     * @brief Set the current cursor position for the console.
     * @param[in] sPos Console position to place the current cursor at.
     */
    void SetCursorPos(SConsolePos sPos);

    /**
     * @brief Print text at a specific location.
     * @param[in] sPos The location to print text at.
     * @param[in] rssText Reference to the text to print.
    */
    void PrintText(SConsolePos sPos, const std::string& rssText);

    /**
     * @brief Print a value string at a specific location.
     * @tparam TValue Type of value.
     * @param[in] sPos The location to print the value at.
     * @param[in] rssName Reference to the value.
     * @param[in] tValue The value.
     * @param[in] rssStatus Status, because we have signals of type bool
     */
    template <typename TValue>
    void PrintValue(SConsolePos sPos, const std::string& rssName, TValue tValue, const std::string& rssStatus);

    /**
     * @brief Align string between name and value.
     * @param[in] message Reference to the message to align.
     * @param[in] desiredLength The desired length or 0 when no length is specified.
     * @return The aligned string.
    */
    std::string AlignString(const std::string& message, uint32_t desiredLength = 0);

    mutable std::mutex  m_mtxPrintToConsole;                ///< Mutex to print complete message
    bool                m_bRunning = false;                 ///< When set, the application is running.

    sdv::core::CSignal  m_SignalSpeed;                      ///< Speed
    float               m_SpeedDL = 0.0;                    ///< Speed Data Link
    float               m_SpeedVD = 0.0;                    ///< Speed Vehicle Device
    float               m_SpeedBS = 0.0;                    ///< Speed Basic Service
    bool                m_bWasMovingBS = false;             ///< Transition flag for movement status.

    vss::Vehicle::Body::TrunkService::IVSS_SetOpen* m_pTrunkService = nullptr;  ///< trunk (basic service)
    vss::Vehicle::Body::TrunkDevice::IVSS_WriteOpen* m_pTrunkDevice = nullptr; ///< trunk (vehicle device)

#ifdef _WIN32
    DWORD               m_dwConsoleOutMode = 0u;            ///< The console mode before switching on ANSI support.
    DWORD               m_dwConsoleInMode = 0u;             ///< The console mode before switching on ANSI support.
#elif defined __unix__
    struct termios      m_sTermAttr{};                      ///< The terminal attributes before disabling echo.
    int                 m_iFileStatus = 0;                  ///< The file status flags for STDIN.
#else
#error The OS is not supported!
#endif

};

template <typename TValue>
inline void CConsole::PrintValue(SConsolePos sPos, const std::string& rssName, TValue tValue, const std::string& rssUnits)
{
    const size_t nValueNameLen = 30;
    std::stringstream sstreamValueText;
    sstreamValueText << rssName <<
        std::string(nValueNameLen - std::min(rssName.size(), static_cast<size_t>(nValueNameLen - 1)) - 1, '.') <<
        " " << std::fixed << std::setprecision(2) << tValue << " " << rssUnits << "  ";

    std::lock_guard<std::mutex> lock(m_mtxPrintToConsole);
    SetCursorPos(sPos);
    std::cout << sstreamValueText.str();
}

template <>
inline void CConsole::PrintValue<bool>(SConsolePos sPos, const std::string& rssName, bool bValue, const std::string& rssStatus)
{;
    PrintValue(sPos, rssName, bValue ? "" : "", rssStatus);
}

#endif // !define CONSOLE_OUTPUT_H