/******************************************************************************
 *
 *  Copyright (C) 2017 ST Microelectronics S.A.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *
 ******************************************************************************/
#define LOG_TAG "NfcNciHalWrapper"
#include <cutils/properties.h>
#include <errno.h>
#include <hardware/nfc.h>
#include <string.h>
#include <unistd.h>
#include "android_logmsg.h"
#include "hal_fd.h"
#include "halcore.h"

extern void HalCoreCallback(void* context, uint32_t event, const void* d,
                            size_t length);
extern bool I2cOpenLayer(void* dev, HAL_CALLBACK callb, HALHANDLE* pHandle);
extern void I2cCloseLayer();

typedef struct {
  struct nfc_nci_device nci_device;  // nci_device must be first struct member
  // below declarations are private variables within HAL
  nfc_stack_callback_t* p_cback;
  nfc_stack_data_callback_t* p_data_cback;
  HALHANDLE hHAL;
} st21nfc_dev_t;

static void halWrapperDataCallback(uint16_t data_len, uint8_t* p_data);
static void halWrapperCallback(uint8_t event, uint8_t event_status);

nfc_stack_callback_t* mHalWrapperCallback = NULL;
nfc_stack_data_callback_t* mHalWrapperDataCallback = NULL;
hal_wrapper_state_e mHalWrapperState = HAL_WRAPPER_STATE_CLOSED;
HALHANDLE mHalHandle = NULL;

uint8_t mClfMode;
uint8_t mFwUpdateTaskMask;
int mRetryFwDwl;
uint8_t mFwUpdateResMask = 0;
uint8_t* ConfigBuffer = NULL;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t ready_cond = PTHREAD_COND_INITIALIZER;

static const uint8_t ApduGetAtr[] = {0x2F, 0x04, 0x05, 0x80,
                                     0x8A, 0x00, 0x00, 0x04};

static const uint8_t nciHeaderPropSetConfig[9] = {0x2F, 0x02, 0x98, 0x04, 0x00,
                                                  0x14, 0x01, 0x00, 0x92};
static uint8_t nciPropEnableFwDbgTraces[256];
static uint8_t nciPropGetFwDbgTracesConfig[] = {0x2F, 0x02, 0x05, 0x03,
                                                0x00, 0x14, 0x01, 0x00};
bool mReadFwConfigDone = false;

bool mHciCreditLent = false;

bool ready_flag = 0;

void wait_ready() {
  pthread_mutex_lock(&mutex);
  while (!ready_flag) {
    pthread_cond_wait(&ready_cond, &mutex);
  }
  pthread_mutex_unlock(&mutex);
}

void set_ready(bool ready) {
  pthread_mutex_lock(&mutex);
  ready_flag = ready;
  pthread_cond_signal(&ready_cond);
  pthread_mutex_unlock(&mutex);
}

bool hal_wrapper_open(st21nfc_dev_t* dev, nfc_stack_callback_t* p_cback,
                      nfc_stack_data_callback_t* p_data_cback,
                      HALHANDLE* pHandle) {
  bool result;

  STLOG_HAL_D("%s", __func__);

  mFwUpdateResMask = hal_fd_init();
  mRetryFwDwl = 5;
  mFwUpdateTaskMask = 0;

  mHalWrapperState = HAL_WRAPPER_STATE_OPEN;
  mHciCreditLent = false;
  mReadFwConfigDone = false;

  mHalWrapperCallback = p_cback;
  mHalWrapperDataCallback = p_data_cback;

  dev->p_data_cback = halWrapperDataCallback;
  dev->p_cback = halWrapperCallback;

  result = I2cOpenLayer(dev, HalCoreCallback, pHandle);

  if (!result || !(*pHandle)) {
    return -1;  // We are doomed, stop it here, NOW !
  }

  mHalHandle = *pHandle;

  return 1;
}

int hal_wrapper_close(int call_cb, int nfc_mode) {
  STLOG_HAL_V("%s - Sending PROP_NFC_MODE_SET_CMD(%d)", __func__, nfc_mode);
  uint8_t propNfcModeSetCmdQb[] = {0x2f, 0x02, 0x02, 0x02, (uint8_t)nfc_mode};

  mHalWrapperState = HAL_WRAPPER_STATE_CLOSING;
  // Send PROP_NFC_MODE_SET_CMD
  if (!HalSendDownstreamTimer(mHalHandle, propNfcModeSetCmdQb,
                              sizeof(propNfcModeSetCmdQb), 100)) {
    STLOG_HAL_E("NFC-NCI HAL: %s  HalSendDownstreamTimer failed", __func__);
    return -1;
  }
  // Let the CLF receive and process this
  usleep(50000);

  I2cCloseLayer();
  if (call_cb) mHalWrapperCallback(HAL_NFC_CLOSE_CPLT_EVT, HAL_NFC_STATUS_OK);

  return 1;
}

void hal_wrapper_send_core_config_prop() {
  long retlen = 0;
  int isfound = 0;

  // allocate buffer for setting parameters
  ConfigBuffer = (uint8_t*)malloc(256 * sizeof(uint8_t));
  if (ConfigBuffer != NULL) {
    isfound = GetByteArrayValue(NAME_CORE_CONF_PROP, (char*)ConfigBuffer, 256,
                                &retlen);

    if (isfound > 0) {
      STLOG_HAL_V("%s - Enter", __func__);
      set_ready(0);

      if (!HalSendDownstreamTimer(mHalHandle, ConfigBuffer, retlen, 500)) {
        STLOG_HAL_E("NFC-NCI HAL: %s  SendDownstream failed", __func__);
      }
      mHalWrapperState = HAL_WRAPPER_STATE_PROP_CONFIG;
      wait_ready();
    }
    free(ConfigBuffer);
    ConfigBuffer = NULL;
  }
}

void hal_wrapper_send_vs_config() {
  STLOG_HAL_V("%s - Enter", __func__);
  set_ready(0);

  if (!HalSendDownstreamTimer(mHalHandle, nciPropGetFwDbgTracesConfig,
                              sizeof(nciPropGetFwDbgTracesConfig), 500)) {
    STLOG_HAL_E("%s - SendDownstream failed", __func__);
  }
  mReadFwConfigDone = true;
  wait_ready();
}

void hal_wrapper_send_config() {
  hal_wrapper_send_core_config_prop();
  mHalWrapperState = HAL_WRAPPER_STATE_PROP_CONFIG;
  hal_wrapper_send_vs_config();
}

void halWrapperDataCallback(uint16_t data_len, uint8_t* p_data) {
  uint8_t propNfcModeSetCmdOn[] = {0x2f, 0x02, 0x02, 0x02, 0x01};
  uint8_t coreInitCmd[] = {0x20, 0x01, 0x02, 0x00, 0x00};
  uint8_t coreResetCmd[] = {0x20, 0x00, 0x01, 0x01};
  unsigned long num = 0;

  switch (mHalWrapperState) {
    case HAL_WRAPPER_STATE_CLOSED:  // 0
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_CLOSED", __func__);
      break;
    case HAL_WRAPPER_STATE_OPEN:  // 1
      // CORE_RESET_NTF
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_OPEN", __func__);

      if ((p_data[0] == 0x60) && (p_data[1] == 0x00)) {
        mFwUpdateTaskMask = ft_cmd_HwReset(p_data, &mClfMode);
        STLOG_HAL_V(
            "%s - mFwUpdateTaskMask = %d,  mClfMode = %d,  mRetryFwDwl = %d",
            __func__, mFwUpdateTaskMask, mClfMode, mRetryFwDwl);

        // CLF in MODE LOADER & Update needed.
        if (mClfMode == FT_CLF_MODE_LOADER) {
          HalSendDownstreamStopTimer(mHalHandle);
          STLOG_HAL_V("%s --- CLF mode is LOADER ---", __func__);

          if (mRetryFwDwl == 0) {
            STLOG_HAL_V(
                "%s - Reached maximum nb of retries, FW update failed, exiting",
                __func__);
            mHalWrapperCallback(HAL_NFC_OPEN_CPLT_EVT, HAL_NFC_STATUS_FAILED);
            I2cCloseLayer();
          } else {
            STLOG_HAL_V("%s - Send APDU_GET_ATR_CMD", __func__);
            mRetryFwDwl--;
            if (!HalSendDownstreamTimer(mHalHandle, ApduGetAtr,
                                        sizeof(ApduGetAtr),
                                        FW_TIMER_DURATION)) {
              STLOG_HAL_E("%s - SendDownstream failed", __func__);
            }
            mHalWrapperState = HAL_WRAPPER_STATE_UPDATE;
          }
        } else if (mFwUpdateTaskMask == 0 || mRetryFwDwl == 0) {
          STLOG_HAL_V("%s - Proceeding with normal startup", __func__);
          if (p_data[3] == 0x01) {
            // Normal mode, start HAL
            mHalWrapperCallback(HAL_NFC_OPEN_CPLT_EVT, HAL_NFC_STATUS_OK);
            mHalWrapperState = HAL_WRAPPER_STATE_OPEN_CPLT;
          } else {
            // No more retries or CLF not in correct mode
            mHalWrapperCallback(HAL_NFC_OPEN_CPLT_EVT, HAL_NFC_STATUS_FAILED);
          }
          // CLF in MODE ROUTER & Update needed.
        } else if (mClfMode == FT_CLF_MODE_ROUTER) {
          if ((mFwUpdateTaskMask & FW_UPDATE_NEEDED) &&
              (mFwUpdateResMask & FW_PATCH_AVAILABLE)) {
            STLOG_HAL_V(
                "%s - CLF in ROUTER mode, FW update needed, try upgrade FW -",
                __func__);
            mRetryFwDwl--;

            if (!HalSendDownstream(mHalHandle, coreResetCmd,
                                   sizeof(coreResetCmd))) {
              STLOG_HAL_E("%s - SendDownstream failed", __func__);
            }
            mHalWrapperState = HAL_WRAPPER_STATE_EXIT_HIBERNATE_INTERNAL;
          } else if ((mFwUpdateTaskMask & CONF_UPDATE_NEEDED) &&
                     (mFwUpdateResMask & FW_CUSTOM_PARAM_AVAILABLE)) {
            if (!HalSendDownstream(mHalHandle, coreResetCmd,
                                   sizeof(coreResetCmd))) {
              STLOG_HAL_E("%s - SendDownstream failed", __func__);
            }
            mHalWrapperState = HAL_WRAPPER_STATE_APPLY_CUSTOM_PARAM;
          }
        }
      } else {
        mHalWrapperDataCallback(data_len, p_data);
      }
      break;
    case HAL_WRAPPER_STATE_OPEN_CPLT:  // 2
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_OPEN_CPLT",
                  __func__);
      // CORE_INIT_RSP
      if ((p_data[0] == 0x40) && (p_data[1] == 0x01)) {
      } else if ((p_data[0] == 0x60) && (p_data[1] == 0x06)) {
        STLOG_HAL_V("%s - Sending PROP_NFC_MODE_SET_CMD", __func__);
        // Send PROP_NFC_MODE_SET_CMD(ON)
        if (!HalSendDownstreamTimer(mHalHandle, propNfcModeSetCmdOn,
                                    sizeof(propNfcModeSetCmdOn), 100)) {
          STLOG_HAL_E("NFC-NCI HAL: %s  HalSendDownstreamTimer failed",
                      __func__);
        }
        mHalWrapperState = HAL_WRAPPER_STATE_NFC_ENABLE_ON;
      } else {
        mHalWrapperDataCallback(data_len, p_data);
      }
      break;

    case HAL_WRAPPER_STATE_NFC_ENABLE_ON:  // 3
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_NFC_ENABLE_ON",
                  __func__);
      // PROP_NFC_MODE_SET_RSP
      if ((p_data[0] == 0x4f) && (p_data[1] == 0x02)) {
        // DO nothing: wait for core_reset_ntf or timer timeout
      }
      // CORE_RESET_NTF
      else if ((p_data[0] == 0x60) && (p_data[1] == 0x00)) {
        // Stop timer
        HalSendDownstreamStopTimer(mHalHandle);

        // Send CORE_INIT_CMD
        STLOG_HAL_V("%s - Sending CORE_INIT_CMD", __func__);
        if (!HalSendDownstream(mHalHandle, coreInitCmd, sizeof(coreInitCmd))) {
          STLOG_HAL_E("NFC-NCI HAL: %s  SendDownstream failed", __func__);
        }
      }
      // CORE_INIT_RSP
      else if ((p_data[0] == 0x40) && (p_data[1] == 0x01)) {
        STLOG_HAL_D("%s - NFC mode enabled", __func__);
        // Do we need to lend a credit ?
        if (p_data[13] == 0x00) {
          STLOG_HAL_D("%s - 1 credit lent", __func__);
          p_data[13] = 0x01;
          mHciCreditLent = true;
        }

        mHalWrapperState = HAL_WRAPPER_STATE_READY;
        mHalWrapperDataCallback(data_len, p_data);
      }
      break;

    case HAL_WRAPPER_STATE_PROP_CONFIG:  // 4
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_PROP_CONFIG",
                  __func__);
      // CORE_SET_CONFIG_RSP
      if ((p_data[0] == 0x40) && (p_data[1] == 0x02)) {
        HalSendDownstreamStopTimer(mHalHandle);
        set_ready(1);

        STLOG_HAL_V("%s - Received config RSP, read FW dDBG config", __func__);
      } else if (mHciCreditLent && (p_data[0] == 0x60) && (p_data[1] == 0x06)) {
        // CORE_CONN_CREDITS_NTF
        if (p_data[4] == 0x01) {  // HCI connection
          mHciCreditLent = false;
          STLOG_HAL_D("%s - credit returned", __func__);
          if (p_data[5] == 0x01) {
            // no need to send this.
            break;
          } else {
            if (p_data[5] != 0x00 && p_data[5] != 0xFF) {
              // send with 1 less
              p_data[5]--;
            }
          }
        }
        mHalWrapperDataCallback(data_len, p_data);
      } else if (p_data[0] == 0x4f) {
        // PROP_RSP
        if (mReadFwConfigDone == true) {
          mReadFwConfigDone = false;
          HalSendDownstreamStopTimer(mHalHandle);
          set_ready(1);
          // NFC_STATUS_OK
          if (p_data[3] == 0x00) {
            bool confNeeded = false;

            // Check if FW DBG shall be set
            if (GetNumValue(NAME_STNFC_FW_DEBUG_ENABLED, &num, sizeof(num))) {
              // If conf file indicate set needed and not yet enabled
              if ((num == 1) && (p_data[7] == 0x00)) {
                STLOG_HAL_D("%s - FW DBG traces enabling needed", __func__);
                nciPropEnableFwDbgTraces[9] = 0x01;
                confNeeded = true;
              } else if ((num == 0) && (p_data[7] == 0x01)) {
                STLOG_HAL_D("%s - FW DBG traces disabling needed", __func__);
                nciPropEnableFwDbgTraces[9] = 0x00;
                confNeeded = true;
              } else {
                STLOG_HAL_D("%s - No changes in FW DBG traces config needed",
                            __func__);
              }

              if (confNeeded) {
                memcpy(nciPropEnableFwDbgTraces, nciHeaderPropSetConfig, 9);
                memcpy(&nciPropEnableFwDbgTraces[10], &p_data[8],
                       p_data[6] - 1);
                confNeeded = false;

                if (!HalSendDownstream(mHalHandle, nciPropEnableFwDbgTraces,
                                       sizeof(nciPropEnableFwDbgTraces))) {
                  STLOG_HAL_E("%s - SendDownstream failed", __func__);
                }

                break;
              }
            }
          }
        }

        // Exit state, all processing done
        mHalWrapperCallback(HAL_NFC_POST_INIT_CPLT_EVT, HAL_NFC_STATUS_OK);
        mHalWrapperState = HAL_WRAPPER_STATE_READY;
      }
      break;

    case HAL_WRAPPER_STATE_READY:  // 5
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_READY", __func__);
      if (!((p_data[0] == 0x60) && (p_data[3] == 0xa0))) {
        if (mHciCreditLent && (p_data[0] == 0x60) && (p_data[1] == 0x06)) {
          if (p_data[4] == 0x01) {  // HCI connection
            mHciCreditLent = false;
            STLOG_HAL_D("%s - credit returned", __func__);
            if (p_data[5] == 0x01) {
              // no need to send this.
              break;
            } else {
              if (p_data[5] != 0x00 && p_data[5] != 0xFF) {
                // send with 1 less
                p_data[5]--;
              }
            }
          }
        }
        mHalWrapperDataCallback(data_len, p_data);
      } else {
        STLOG_HAL_V("%s - Core reset notification - Nfc mode ", __func__);
      }
      break;

    case HAL_WRAPPER_STATE_CLOSING:  // 6
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_CLOSING",
                  __func__);
      if ((p_data[0] == 0x4f) && (p_data[1] == 0x02)) {
        // intercept this expected message, don t forward.
        mHalWrapperState = HAL_WRAPPER_STATE_CLOSED;
      } else {
        mHalWrapperDataCallback(data_len, p_data);
      }
      break;

    case HAL_WRAPPER_STATE_EXIT_HIBERNATE_INTERNAL:  // 6
      STLOG_HAL_V(
          "%s - mHalWrapperState = HAL_WRAPPER_STATE_EXIT_HIBERNATE_INTERNAL",
          __func__);
      ExitHibernateHandler(mHalHandle, data_len, p_data);
      break;

    case HAL_WRAPPER_STATE_UPDATE:  // 7
      STLOG_HAL_V("%s - mHalWrapperState = HAL_WRAPPER_STATE_UPDATE", __func__);
      UpdateHandler(mHalHandle, data_len, p_data);
      break;
    case HAL_WRAPPER_STATE_APPLY_CUSTOM_PARAM:  // 8
      STLOG_HAL_V(
          "%s - mHalWrapperState = HAL_WRAPPER_STATE_APPLY_CUSTOM_PARAM",
          __func__);
      ApplyCustomParamHandler(mHalHandle, data_len, p_data);
      break;
  }
}

static void halWrapperCallback(uint8_t event, uint8_t event_status) {
  uint8_t coreInitCmd[] = {0x20, 0x01, 0x02, 0x00, 0x00};

  switch (mHalWrapperState) {
    case HAL_WRAPPER_STATE_CLOSED:
      if (event == HAL_WRAPPER_TIMEOUT_EVT) {
        STLOG_HAL_D("NFC-NCI HAL: %s  Timeout. Close anyway", __func__);
        HalSendDownstreamStopTimer(mHalHandle);
        return;
      }
      break;

    case HAL_WRAPPER_STATE_UPDATE:
      if (event == HAL_WRAPPER_TIMEOUT_EVT) {
        STLOG_HAL_E("%s - Timer for FW update procedure timeout, retry",
                    __func__);
        HalSendDownstreamStopTimer(mHalHandle);
        resetHandlerState();
        I2cResetPulse();
        mHalWrapperState = HAL_WRAPPER_STATE_OPEN;
      }
      break;

    case HAL_WRAPPER_STATE_NFC_ENABLE_ON:
      if (event == HAL_WRAPPER_TIMEOUT_EVT) {
        // timeout
        // Send CORE_INIT_CMD
        STLOG_HAL_V("%s - Sending CORE_INIT_CMD", __func__);
        if (!HalSendDownstream(mHalHandle, coreInitCmd, sizeof(coreInitCmd))) {
          STLOG_HAL_E("NFC-NCI HAL: %s  SendDownstream failed", __func__);
        }
        return;
      }
      break;
    case HAL_WRAPPER_STATE_PROP_CONFIG:
      if (event == HAL_WRAPPER_TIMEOUT_EVT) {
        STLOG_HAL_E("%s - Timer when sending conf parameters, retry", __func__);
        HalSendDownstreamStopTimer(mHalHandle);
        resetHandlerState();
        I2cResetPulse();
        mHalWrapperState = HAL_WRAPPER_STATE_OPEN;
      }
      break;

    default:
      break;
  }

  mHalWrapperCallback(event, event_status);
}

/*******************************************************************************
 **
 ** Function         nfc_set_state
 **
 ** Description      Set the state of NFC stack
 **
 ** Returns          void
 **
 *******************************************************************************/
void hal_wrapper_set_state(hal_wrapper_state_e new_wrapper_state) {
  ALOGD("nfc_set_state %d->%d", mHalWrapperState, new_wrapper_state);

  mHalWrapperState = new_wrapper_state;
}