/******************************************************************************
 *
 *  Copyright (C) 1999-2012 Broadcom Corporation
 *  Copyright (C) 2013 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.
 *
 *  Modified by ST Microelectronics S.A. (adaptation of nfc_nci.c for ST21NFC
 *NCI version)
 *
 ******************************************************************************/

#include <cutils/properties.h>
#include <errno.h>
#include <hardware/nfc.h>
#include <string.h>

#include "StNfc_hal_api.h"
#include "android_logmsg.h"
#include "hal_config.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);

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;
  nfc_stack_callback_t* p_cback_unwrap;
} st21nfc_dev_t;

const char* halVersion = "ST21NFC HAL1.1 Version 3.1.16";

uint8_t cmd_set_nfc_mode_enable[] = {0x2f, 0x02, 0x02, 0x02, 0x01};
uint8_t hal_is_closed = 1;
pthread_mutex_t hal_mtx = PTHREAD_MUTEX_INITIALIZER;
st21nfc_dev_t dev;
uint8_t hal_dta_state = 0;
int nfc_mode = 0;

using namespace android::hardware::nfc::V1_1;
using android::hardware::nfc::V1_1::NfcEvent;

/*
 * NCI HAL method implementations. These must be overridden
 */

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

extern int hal_wrapper_close(int call_cb, int nfc_mode);

extern void hal_wrapper_send_config();
extern void hal_wrapper_factoryReset();

/* Make sure to always post nfc_stack_callback_t in a separate thread.
This prevents a possible deadlock in upper layer on some sequences.
We need to synchronize finely for the callback called for hal close,
otherwise the upper layer either does not receive the event, or deadlocks,
because the HAL is closing while the callback may be blocked.
 */
static struct async_callback_struct {
  pthread_mutex_t mutex;
  pthread_cond_t cond;
  pthread_t thr;
  int event_pending;
  int stop_thread;
  int thread_running;
  nfc_event_t event;
  nfc_status_t event_status;
} async_callback_data;

static void* async_callback_thread_fct(void* arg) {
  int ret;
  struct async_callback_struct* pcb_data = (struct async_callback_struct*)arg;

  ret = pthread_mutex_lock(&pcb_data->mutex);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_mutex_lock failed", __func__);
    goto error;
  }

  do {
    if (pcb_data->event_pending == 0) {
      ret = pthread_cond_wait(&pcb_data->cond, &pcb_data->mutex);
      if (ret != 0) {
        STLOG_HAL_E("HAL: %s pthread_cond_wait failed", __func__);
        break;
      }
    }

    if (pcb_data->event_pending) {
      nfc_event_t event = pcb_data->event;
      nfc_status_t event_status = pcb_data->event_status;
      int ending = pcb_data->stop_thread;
      pcb_data->event_pending = 0;
      ret = pthread_cond_signal(&pcb_data->cond);
      if (ret != 0) {
        STLOG_HAL_E("HAL: %s pthread_cond_signal failed", __func__);
        break;
      }
      if (ending) {
        pcb_data->thread_running = 0;
      }
      ret = pthread_mutex_unlock(&pcb_data->mutex);
      if (ret != 0) {
        STLOG_HAL_E("HAL: %s pthread_mutex_unlock failed", __func__);
      }
      STLOG_HAL_D("HAL st21nfc: %s event %hhx status %hhx", __func__, event,
                  event_status);
      dev.p_cback_unwrap(event, event_status);
      if (ending) {
        return NULL;
      }
      ret = pthread_mutex_lock(&pcb_data->mutex);
      if (ret != 0) {
        STLOG_HAL_E("HAL: %s pthread_mutex_lock failed", __func__);
        goto error;
      }
    }
  } while (pcb_data->stop_thread == 0 || pcb_data->event_pending);

  ret = pthread_mutex_unlock(&pcb_data->mutex);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_mutex_unlock failed", __func__);
  }

error:
  pcb_data->thread_running = 0;
  return NULL;
}

static int async_callback_thread_start() {
  int ret;

  memset(&async_callback_data, 0, sizeof(async_callback_data));

  ret = pthread_mutex_init(&async_callback_data.mutex, NULL);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_mutex_init failed", __func__);
    return ret;
  }

  ret = pthread_cond_init(&async_callback_data.cond, NULL);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_cond_init failed", __func__);
    return ret;
  }

  async_callback_data.thread_running = 1;

  ret = pthread_create(&async_callback_data.thr, NULL,
                       async_callback_thread_fct, &async_callback_data);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_create failed", __func__);
    async_callback_data.thread_running = 0;
    return ret;
  }

  return 0;
}

static int async_callback_thread_end() {
  if (async_callback_data.thread_running != 0) {
    int ret;

    ret = pthread_mutex_lock(&async_callback_data.mutex);
    if (ret != 0) {
      STLOG_HAL_E("HAL: %s pthread_mutex_lock failed", __func__);
      return ret;
    }

    async_callback_data.stop_thread = 1;

    // Wait for the thread to have no event pending
    while (async_callback_data.thread_running &&
           async_callback_data.event_pending) {
      ret = pthread_cond_signal(&async_callback_data.cond);
      if (ret != 0) {
        STLOG_HAL_E("HAL: %s pthread_cond_signal failed", __func__);
        return ret;
      }
      ret = pthread_cond_wait(&async_callback_data.cond,
                              &async_callback_data.mutex);
      if (ret != 0) {
        STLOG_HAL_E("HAL: %s pthread_cond_wait failed", __func__);
        break;
      }
    }

    ret = pthread_mutex_unlock(&async_callback_data.mutex);
    if (ret != 0) {
      STLOG_HAL_E("HAL: %s pthread_mutex_unlock failed", __func__);
      return ret;
    }

    ret = pthread_cond_signal(&async_callback_data.cond);
    if (ret != 0) {
      STLOG_HAL_E("HAL: %s pthread_cond_signal failed", __func__);
      return ret;
    }

    ret = pthread_detach(async_callback_data.thr);
    if (ret != 0) {
      STLOG_HAL_E("HAL: %s pthread_detach failed", __func__);
      return ret;
    }
  }
  return 0;
}

static void async_callback_post(nfc_event_t event, nfc_status_t event_status) {
  int ret;

  if (pthread_equal(pthread_self(), async_callback_data.thr)) {
    dev.p_cback_unwrap(event, event_status);
  }

  ret = pthread_mutex_lock(&async_callback_data.mutex);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_mutex_lock failed", __func__);
    return;
  }

  if (async_callback_data.thread_running == 0) {
    (void)pthread_mutex_unlock(&async_callback_data.mutex);
    STLOG_HAL_E("HAL: %s thread is not running", __func__);
    dev.p_cback_unwrap(event, event_status);
    return;
  }

  while (async_callback_data.event_pending) {
    ret = pthread_cond_wait(&async_callback_data.cond,
                            &async_callback_data.mutex);
    if (ret != 0) {
      STLOG_HAL_E("HAL: %s pthread_cond_wait failed", __func__);
      return;
    }
  }

  async_callback_data.event_pending = 1;
  async_callback_data.event = event;
  async_callback_data.event_status = event_status;

  ret = pthread_mutex_unlock(&async_callback_data.mutex);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_mutex_unlock failed", __func__);
    return;
  }

  ret = pthread_cond_signal(&async_callback_data.cond);
  if (ret != 0) {
    STLOG_HAL_E("HAL: %s pthread_cond_signal failed", __func__);
    return;
  }
}
/* ------ */

int StNfc_hal_open(nfc_stack_callback_t* p_cback,
                   nfc_stack_data_callback_t* p_data_cback) {
  bool result = false;

  STLOG_HAL_D("HAL st21nfc: %s %s", __func__, halVersion);

  (void)pthread_mutex_lock(&hal_mtx);

  if (!hal_is_closed) {
    hal_wrapper_close(0, nfc_mode);
  }

  dev.p_cback = p_cback;  // will be replaced by wrapper version
  dev.p_cback_unwrap = p_cback;
  dev.p_data_cback = p_data_cback;
  hal_dta_state = 0;
  // Initialize and get global logging level
  InitializeSTLogLevel();

  if ((hal_is_closed || !async_callback_data.thread_running) &&
      (async_callback_thread_start() != 0)) {
    dev.p_cback(HAL_NFC_OPEN_CPLT_EVT, HAL_NFC_STATUS_FAILED);
    (void)pthread_mutex_unlock(&hal_mtx);
    return -1;  // We are doomed, stop it here, NOW !
  }
  result =
      hal_wrapper_open(&dev, async_callback_post, p_data_cback, &(dev.hHAL));

  if (!result || !(dev.hHAL)) {
    async_callback_post(HAL_NFC_OPEN_CPLT_EVT, HAL_NFC_STATUS_FAILED);
    (void)pthread_mutex_unlock(&hal_mtx);
    return -1;  // We are doomed, stop it here, NOW !
  }
  hal_is_closed = 0;
  (void)pthread_mutex_unlock(&hal_mtx);
  return 0;
}

int StNfc_hal_write(uint16_t data_len, const uint8_t* p_data) {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);

  /* check if HAL is closed */
  int ret = (int)data_len;
  (void)pthread_mutex_lock(&hal_mtx);
  if (hal_is_closed) {
    ret = 0;
  }

  if (!ret) {
    (void)pthread_mutex_unlock(&hal_mtx);
    return ret;
  }
  if (!HalSendDownstream(dev.hHAL, p_data, data_len)) {
    STLOG_HAL_E("HAL st21nfc %s  SendDownstream failed", __func__);
    (void)pthread_mutex_unlock(&hal_mtx);
    return 0;
  }
  (void)pthread_mutex_unlock(&hal_mtx);

  return ret;
}

int StNfc_hal_core_initialized(uint8_t* p_core_init_rsp_params) {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);

  (void)pthread_mutex_lock(&hal_mtx);
  hal_dta_state = *p_core_init_rsp_params;

  hal_wrapper_send_config();
  (void) pthread_mutex_unlock(&hal_mtx);

  return 0;  // return != 0 to signal ready immediate
}

int StNfc_hal_pre_discover() {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);

  return 0;  // false if no vendor-specific pre-discovery actions are needed
}

int StNfc_hal_close(int nfc_mode_value) {
  STLOG_HAL_D("HAL st21nfc: %s nfc_mode = %d", __func__, nfc_mode_value);

  /* check if HAL is closed */
  (void)pthread_mutex_lock(&hal_mtx);
  if (hal_is_closed) {
    (void)pthread_mutex_unlock(&hal_mtx);
    return 1;
  }
  if (hal_wrapper_close(1, nfc_mode_value) == 0) {
    hal_is_closed = 1;
    (void)pthread_mutex_unlock(&hal_mtx);
    return 1;
  }
  hal_is_closed = 1;
  (void)pthread_mutex_unlock(&hal_mtx);

  hal_dta_state = 0;

  if (async_callback_thread_end() != 0) {
    STLOG_HAL_E("HAL st21nfc: %s async_callback_thread_end failed", __func__);
    return -1;  // We are doomed, stop it here, NOW !
  }

  usleep(10000);  // give 10ms for the callback thread to pass the binder
  STLOG_HAL_D("HAL st21nfc: %s close", __func__);
  return 0;
}

int StNfc_hal_control_granted() {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);

  return 0;
}

int StNfc_hal_power_cycle() {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);

  /* check if HAL is closed */
  int ret = HAL_NFC_STATUS_OK;
  (void)pthread_mutex_lock(&hal_mtx);
  if (hal_is_closed) {
    ret = HAL_NFC_STATUS_FAILED;
  }

  if (ret != HAL_NFC_STATUS_OK) {
    (void)pthread_mutex_unlock(&hal_mtx);
    return ret;
  }
  async_callback_post(HAL_NFC_OPEN_CPLT_EVT, HAL_NFC_STATUS_OK);

  (void)pthread_mutex_unlock(&hal_mtx);
  return HAL_NFC_STATUS_OK;
}

void StNfc_hal_factoryReset() {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);
  //hal_wrapper_factoryReset();
  // Nothing needed for factory reset in st21nfc case.
}

int StNfc_hal_closeForPowerOffCase() {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);

  return StNfc_hal_close(nfc_mode);
}

void StNfc_hal_getConfig(NfcConfig& config) {
  STLOG_HAL_D("HAL st21nfc: %s", __func__);
  unsigned long num = 0;
  std::array<uint8_t, 10> buffer;

  buffer.fill(0);
  long retlen = 0;

  memset(&config, 0x00, sizeof(NfcConfig));

  if (GetNumValue(NAME_CE_ON_SWITCH_OFF_STATE, &num, sizeof(num))) {
    if (num == 0x1) {
      nfc_mode = 0x2;
    }
  }

  if (GetNumValue(NAME_POLL_BAIL_OUT_MODE, &num, sizeof(num))) {
    config.nfaPollBailOutMode = num;
  }

  if (GetNumValue(NAME_ISO_DEP_MAX_TRANSCEIVE, &num, sizeof(num))) {
    config.maxIsoDepTransceiveLength = num;
  }
  if (GetNumValue(NAME_DEFAULT_OFFHOST_ROUTE, &num, sizeof(num))) {
    config.defaultOffHostRoute = num;
  }
  if (GetNumValue(NAME_DEFAULT_NFCF_ROUTE, &num, sizeof(num))) {
    config.defaultOffHostRouteFelica = num;
  }
  if (GetNumValue(NAME_DEFAULT_SYS_CODE_ROUTE, &num, sizeof(num))) {
    config.defaultSystemCodeRoute = num;
  }
  if (GetNumValue(NAME_DEFAULT_SYS_CODE_PWR_STATE, &num, sizeof(num))) {
    config.defaultSystemCodePowerState = num;
  }
  if (GetNumValue(NAME_DEFAULT_ROUTE, &num, sizeof(num))) {
    config.defaultRoute = num;
  }
  if (GetByteArrayValue(NAME_DEVICE_HOST_WHITE_LIST, (char*)buffer.data(),
                        buffer.size(), &retlen)) {
    config.hostWhitelist.resize(retlen);
    for (int i = 0; i < retlen; i++) {
      config.hostWhitelist[i] = buffer[i];
    }
  }

  if (GetNumValue(NAME_OFF_HOST_ESE_PIPE_ID, &num, sizeof(num))) {
    config.offHostESEPipeId = num;
  }
  if (GetNumValue(NAME_OFF_HOST_SIM_PIPE_ID, &num, sizeof(num))) {
    config.offHostSIMPipeId = num;
  }
  if ((GetByteArrayValue(NAME_NFA_PROPRIETARY_CFG, (char*)buffer.data(),
                         buffer.size(), &retlen)) &&
      (retlen == 9)) {
    config.nfaProprietaryCfg.protocol18092Active = (uint8_t)buffer[0];
    config.nfaProprietaryCfg.protocolBPrime = (uint8_t)buffer[1];
    config.nfaProprietaryCfg.protocolDual = (uint8_t)buffer[2];
    config.nfaProprietaryCfg.protocol15693 = (uint8_t)buffer[3];
    config.nfaProprietaryCfg.protocolKovio = (uint8_t)buffer[4];
    config.nfaProprietaryCfg.protocolMifare = (uint8_t)buffer[5];
    config.nfaProprietaryCfg.discoveryPollKovio = (uint8_t)buffer[6];
    config.nfaProprietaryCfg.discoveryPollBPrime = (uint8_t)buffer[7];
    config.nfaProprietaryCfg.discoveryListenBPrime = (uint8_t)buffer[8];
  } else {
    memset(&config.nfaProprietaryCfg, 0xFF, sizeof(ProtocolDiscoveryConfig));
  }
  if (GetNumValue(NAME_PRESENCE_CHECK_ALGORITHM, &num, sizeof(num))) {
    config.presenceCheckAlgorithm = (PresenceCheckAlgorithm)num;
  }
}