// SPDX-License-Identifier: GPL-2.0-only
/**
* Digital Voice Modem - Modem Host Software
* GPLv2 Open Source. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* @package DVM / Modem Host Software
* @license GPLv2 License (https://opensource.org/licenses/GPL-2.0)
*
*   Copyright (C) 2017-2023 Bryan Biedenkapp, N2PLL
*
*/
#include "Defines.h"
#include "Host.h"

using namespace modem;

// ---------------------------------------------------------------------------
//  Private Class Members
// ---------------------------------------------------------------------------

/// <summary>
/// Helper to interrupt a running NXDN control channel.
/// </summary>
/// <param name="control"></param>
void Host::interruptNXDNControl(nxdn::Control* control)
{
    if (control != nullptr) {
        LogDebug(LOG_HOST, "interrupt NXDN control, m_state = %u", m_state);
        control->setCCHalted(true);         

        if (m_nxdnBcastDurationTimer.isRunning() && !m_nxdnBcastDurationTimer.isPaused()) {
            m_nxdnBcastDurationTimer.pause();
        }
    }
}

/// <summary>
/// Helper to read NXDN frames from modem.
/// </summary>
/// <param name="control"></param>
/// <param name="afterReadCallback"></param>
void Host::readFramesNXDN(nxdn::Control* control, std::function<void()>&& afterReadCallback)
{
    uint8_t data[nxdn::NXDN_FRAME_LENGTH_BYTES * 2U];

    if (control != nullptr) {
        uint32_t len = m_modem->readNXDNFrame(data);
        if (len > 0U) {
            if (m_state == STATE_IDLE) {
                // process NXDN frames
                bool ret = control->processFrame(data, len);
                if (ret) {
                    m_modeTimer.setTimeout(m_rfModeHang);
                    setState(STATE_NXDN);

                    if (afterReadCallback != nullptr) {
                        afterReadCallback();
                    }
                }
            }
            else if (m_state == STATE_NXDN) {
                // process NXDN frames
                bool ret = control->processFrame(data, len);
                if (ret) {
                    m_modeTimer.start();
                }
            }
            else if (m_state != HOST_STATE_LOCKOUT) {
                LogWarning(LOG_HOST, "NXDN modem data received, state = %u", m_state);
            }
        }
    }
}

/// <summary>
/// Helper to write NXDN frames to modem.
/// </summary>
/// <param name="control"></param>
/// <param name="afterWriteCallback"></param>
void Host::writeFramesNXDN(nxdn::Control* control, std::function<void()>&& afterWriteCallback)
{
    uint8_t data[nxdn::NXDN_FRAME_LENGTH_BYTES * 2U];

    // check if there is space on the modem for NXDN frames,
    // if there is read frames from the NXDN controller and write it
    // to the modem
    if (control != nullptr) {
        bool ret = m_modem->hasNXDNSpace();
        if (ret) {
            uint32_t nextLen = control->peekFrameLength();
            if (m_nxdnCtrlChannel) {
                if (m_nxdnDedicatedTxTestTimer.hasExpired() && !m_nxdnDedicatedTxTestTimer.isPaused()) {
                    m_nxdnDedicatedTxTestTimer.pause();
                    if (!m_modem->hasTX() && m_modem->gotModemStatus() && m_state == STATE_NXDN && control->getCCRunning()) {
                        LogError(LOG_HOST, "NXDN dedicated control stopped transmitting, running = %u, halted = %u, frameLength = %u", control->getCCRunning(), control->getCCHalted(), nextLen);
                    }
                }
            }

            uint32_t len = control->getFrame(data);
            if (len > 0U) {
                // if the state is idle; set to NXDN and start mode timer
                if (m_state == STATE_IDLE) {
                    m_modeTimer.setTimeout(m_netModeHang);
                    setState(STATE_NXDN);
                }

                // if the state is NXDN; write NXDN data
                if (m_state == STATE_NXDN) {
                    m_modem->writeNXDNFrame(data, len);

                    if (afterWriteCallback != nullptr) {
                        afterWriteCallback();
                    }

                    m_modeTimer.start();
                }

                m_lastDstId = control->getLastDstId();
                m_lastSrcId = control->getLastSrcId();
            }
        }
    }
}