/*
 *   Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
 *   Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
 *   Copyright (C) 2017 by Danilo DB4PLE 
 
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
#include "Config.h"
#include "Globals.h"
#include "IO.h"

uint32_t    m_frequency_rx;
uint32_t    m_frequency_tx;
uint8_t     m_power;

CIO::CIO():
m_started(false),
m_rxBuffer(RX_RINGBUFFER_SIZE),
m_txBuffer(TX_RINGBUFFER_SIZE),
m_LoDevYSF(false),
m_ledCount(0U),
m_scanEnable(false),
m_scanPauseCnt(0U),
m_scanPos(0U),
m_ledValue(true),
m_watchdog(0U)
{
  Init();
  
  CE_pin(HIGH);
  LED_pin(HIGH);
  PTT_pin(LOW);
  DSTAR_pin(LOW);
  DMR_pin(LOW);
  YSF_pin(LOW);
  P25_pin(LOW);
  NXDN_pin(LOW);
  COS_pin(LOW);
  DEB_pin(LOW);

#if !defined(BIDIR_DATA_PIN)
  TXD_pin(LOW);
#endif

  SCLK_pin(LOW);
  SDATA_pin(LOW);
  SLE_pin(LOW);

  selfTest();

  m_modeTimerCnt = 0U;
}

void CIO::selfTest()
{
  bool ledValue = false;
  uint32_t ledCount = 0U;
  uint32_t blinks = 0U;

  while(true) {
    ledCount++;
    delay_us(1000U);

    if(ledCount >= 125U) {
      ledCount = 0U;
      ledValue = !ledValue;

      LED_pin(!ledValue);
      PTT_pin(ledValue);
      DSTAR_pin(ledValue);
      DMR_pin(ledValue);
      YSF_pin(ledValue);
      P25_pin(ledValue);
      NXDN_pin(ledValue);
      COS_pin(ledValue);

      blinks++;

      if(blinks > 5U)
        break;
    }
  }
}

void CIO::process()
{
  uint8_t bit;
  uint32_t scantime;
  uint8_t  control;
  
  m_ledCount++;
  
  if (m_started) {
    // Two seconds timeout
    if (m_watchdog >= 19200U) {
      if (m_modemState == STATE_DSTAR || m_modemState == STATE_DMR || m_modemState == STATE_YSF ||  m_modemState == STATE_P25 ||  m_modemState == STATE_NXDN) {
        m_modemState = STATE_IDLE;
        setMode(m_modemState);
      }

      m_watchdog = 0U;
    }

    if (m_ledCount >= 24000U) {
      m_ledCount = 0U;
      m_ledValue = !m_ledValue;
      LED_pin(m_ledValue);
    }
  } else {
    if (m_ledCount >= 240000U) {
      m_ledCount = 0U;
      m_ledValue = !m_ledValue;
      LED_pin(m_ledValue);
    }
    return;
  }

  // Switch off the transmitter if needed
  if (m_txBuffer.getData() == 0U && m_tx) {
    if(m_cwid_state) { // check for CW ID end of transmission
      m_cwid_state = false;
      // Restoring previous mode
      io.ifConf(m_modemState_prev, true);
    }
    setRX(false);
  }
  
  if(m_modemState_prev == STATE_DSTAR)
    scantime = SCAN_TIME;
  else if(m_modemState_prev == STATE_DMR)
    scantime = SCAN_TIME * 2U;
  else if(m_modemState_prev == STATE_YSF)
    scantime = SCAN_TIME;
  else if(m_modemState_prev == STATE_P25)
    scantime = SCAN_TIME;
  else if(m_modemState_prev == STATE_NXDN)
    scantime = SCAN_TIME;
  else
    scantime = SCAN_TIME;

  if(m_modeTimerCnt >= scantime) {
    m_modeTimerCnt = 0U;
    if( (m_modemState == STATE_IDLE) && (m_scanPauseCnt == 0U) && m_scanEnable && !m_cwid_state) {
      m_scanPos = (m_scanPos + 1U) % m_TotalModes;
      #if !defined(QUIET_MODE_LEDS)
      setMode(m_Modes[m_scanPos]);
      #endif
      io.ifConf(m_Modes[m_scanPos], true);
    }
  }

  if (m_rxBuffer.getData() >= 1U) {
    m_rxBuffer.get(bit, control);
    
    switch (m_modemState_prev) {
      case STATE_DSTAR:
        dstarRX.databit(bit);
        break;
      case STATE_DMR:
#if defined(DUPLEX)
        if (m_duplex) {
          if (m_tx)
            dmrRX.databit(bit, control);
          else
            dmrIdleRX.databit(bit);
        } else
          dmrDMORX.databit(bit);
#else
        dmrDMORX.databit(bit);
#endif
        break;
      case STATE_YSF:
        ysfRX.databit(bit);
        break;
      case STATE_P25:
        p25RX.databit(bit);
        break;
      case STATE_NXDN:
        nxdnRX.databit(bit);
        break;
      default:
        break;
    }

  }
}

void CIO::start()
{ 
  m_TotalModes = 0U;
  
  if(m_dstarEnable) {
    m_Modes[m_TotalModes] = STATE_DSTAR;
    m_TotalModes++;
  }
  if(m_dmrEnable) {
    m_Modes[m_TotalModes] = STATE_DMR;
    m_TotalModes++;
  }
  if(m_ysfEnable) {
    m_Modes[m_TotalModes] = STATE_YSF;
    m_TotalModes++;
  }
  if(m_p25Enable) {
    m_Modes[m_TotalModes] = STATE_P25;
    m_TotalModes++;
  }
  if(m_nxdnEnable) {
    m_Modes[m_TotalModes] = STATE_NXDN;
    m_TotalModes++;
  }
  
#if defined(ENABLE_SCAN_MODE)
  if(m_TotalModes > 1U)
    m_scanEnable = true;
  else {
    m_scanEnable = false;
    setMode(m_modemState);
  }
#else
  m_scanEnable = false;
  setMode(m_modemState);
#endif

  if (m_started)
    return;
    
  startInt();
    
  m_started = true;
}

void CIO::write(uint8_t* data, uint16_t length, const uint8_t* control)
{
  if (!m_started)
    return;

  for (uint16_t i = 0U; i < length; i++) {
    if (control == NULL)
      m_txBuffer.put(data[i], MARK_NONE);
    else
      m_txBuffer.put(data[i], control[i]);
  }
  
  // Switch the transmitter on if needed
  if (!m_tx) {
    setTX();
    m_tx = true;
  }
}

uint16_t CIO::getSpace() const
{
  return m_txBuffer.getSpace();
}

bool CIO::hasTXOverflow()
{
  return m_txBuffer.hasOverflowed();
}

bool CIO::hasRXOverflow()
{
  return m_rxBuffer.hasOverflowed();
}

uint8_t CIO::setFreq(uint32_t frequency_rx, uint32_t frequency_tx, uint8_t rf_power)
{
  // Configure power level
  setPower(rf_power);

  // Check frequency ranges
  if( !( ((frequency_rx >= VHF1_MIN)&&(frequency_rx < VHF1_MAX)) || ((frequency_tx >= VHF1_MIN)&&(frequency_tx < VHF1_MAX)) || \
  ((frequency_rx >= UHF1_MIN)&&(frequency_rx < UHF1_MAX)) || ((frequency_tx >= UHF1_MIN)&&(frequency_tx < UHF1_MAX)) || \
  ((frequency_rx >= VHF2_MIN)&&(frequency_rx < VHF2_MAX)) || ((frequency_tx >= VHF2_MIN)&&(frequency_tx < VHF2_MAX)) || \
  ((frequency_rx >= UHF2_MIN)&&(frequency_rx < UHF2_MAX)) || ((frequency_tx >= UHF2_MIN)&&(frequency_tx < UHF2_MAX)) ) )
    return 4U;

  // Configure frequency
  m_frequency_rx = frequency_rx;
  m_frequency_tx = frequency_tx;

  return 0U;
}

void CIO::setMode(MMDVM_STATE modemState)
{
  DSTAR_pin(modemState == STATE_DSTAR);
  DMR_pin(modemState   == STATE_DMR);
  YSF_pin(modemState   == STATE_YSF);
  P25_pin(modemState   == STATE_P25);
  NXDN_pin(modemState   == STATE_NXDN);
}

void CIO::setDecode(bool dcd)
{
  if (dcd != m_dcd) {
    m_scanPauseCnt = 1U;
    COS_pin(dcd ? true : false);
  }

  m_dcd = dcd;
}

void CIO::setLoDevYSF(bool on)
{
  m_LoDevYSF = on;
}

void CIO::resetWatchdog()
{
  m_watchdog = 0U;
}

uint32_t CIO::getWatchdog()
{
  return m_watchdog;
}