/******************************************************************************
 *
 *  Copyright 2014 Google, Inc.
 *
 *  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 "bt_btif_sock"

#include <atomic>

#include <base/logging.h>

#include <frameworks/base/core/proto/android/bluetooth/enums.pb.h>
#include <hardware/bluetooth.h>
#include <hardware/bt_sock.h>

#include "bta_api.h"
#include "btif_common.h"
#include "btif_sock_l2cap.h"
#include "btif_sock_rfc.h"
#include "btif_sock_sco.h"
#include "btif_sock_sdp.h"
#include "btif_sock_thread.h"
#include "btif_uid.h"
#include "btif_util.h"
#include "common/metrics.h"
#include "device/include/controller.h"
#include "osi/include/thread.h"

using bluetooth::Uuid;

static bt_status_t btsock_listen(btsock_type_t type, const char* service_name,
                                 const Uuid* uuid, int channel, int* sock_fd,
                                 int flags, int app_uid);
static bt_status_t btsock_connect(const RawAddress* bd_addr, btsock_type_t type,
                                  const Uuid* uuid, int channel, int* sock_fd,
                                  int flags, int app_uid);

static void btsock_request_max_tx_data_length(const RawAddress& bd_addr);

static void btsock_signaled(int fd, int type, int flags, uint32_t user_id);

static std::atomic_int thread_handle{-1};
static thread_t* thread;

const btsock_interface_t* btif_sock_get_interface(void) {
  static btsock_interface_t interface = {
      sizeof(interface), btsock_listen, /* listen */
      btsock_connect,                   /* connect */
      btsock_request_max_tx_data_length /* request_max_tx_data_length */
  };

  return &interface;
}

bt_status_t btif_sock_init(uid_set_t* uid_set) {
  CHECK(thread_handle == -1);
  CHECK(thread == NULL);

  bt_status_t status;
  btsock_thread_init();
  thread_handle = btsock_thread_create(btsock_signaled, NULL);
  if (thread_handle == -1) {
    LOG_ERROR(LOG_TAG, "%s unable to create btsock_thread.", __func__);
    goto error;
  }

  status = btsock_rfc_init(thread_handle, uid_set);
  if (status != BT_STATUS_SUCCESS) {
    LOG_ERROR(LOG_TAG, "%s error initializing RFCOMM sockets: %d", __func__,
              status);
    goto error;
  }

  status = btsock_l2cap_init(thread_handle, uid_set);
  if (status != BT_STATUS_SUCCESS) {
    LOG_ERROR(LOG_TAG, "%s error initializing L2CAP sockets: %d", __func__,
              status);
    goto error;
  }

  thread = thread_new("btif_sock");
  if (!thread) {
    LOG_ERROR(LOG_TAG, "%s error creating new thread.", __func__);
    btsock_rfc_cleanup();
    goto error;
  }

  status = btsock_sco_init(thread);
  if (status != BT_STATUS_SUCCESS) {
    LOG_ERROR(LOG_TAG, "%s error initializing SCO sockets: %d", __func__,
              status);
    btsock_rfc_cleanup();
    goto error;
  }

  return BT_STATUS_SUCCESS;

error:;
  thread_free(thread);
  thread = NULL;
  if (thread_handle != -1) btsock_thread_exit(thread_handle);
  thread_handle = -1;
  uid_set = NULL;
  return BT_STATUS_FAIL;
}

void btif_sock_cleanup(void) {
  int saved_handle = thread_handle;
  if (std::atomic_exchange(&thread_handle, -1) == -1) return;

  btsock_thread_exit(saved_handle);
  btsock_rfc_cleanup();
  btsock_sco_cleanup();
  btsock_l2cap_cleanup();
  thread_free(thread);
  thread = NULL;
}

static bt_status_t btsock_listen(btsock_type_t type, const char* service_name,
                                 const Uuid* service_uuid, int channel,
                                 int* sock_fd, int flags, int app_uid) {
  if ((flags & BTSOCK_FLAG_NO_SDP) == 0) {
    CHECK(sock_fd != NULL);
  }

  *sock_fd = INVALID_FD;
  bt_status_t status = BT_STATUS_FAIL;
  int original_channel = channel;

  bluetooth::common::LogSocketConnectionState(
      RawAddress::kEmpty, 0, type,
      android::bluetooth::SocketConnectionstateEnum::
          SOCKET_CONNECTION_STATE_LISTENING,
      0, 0, app_uid, channel, android::bluetooth::SOCKET_ROLE_LISTEN);
  switch (type) {
    case BTSOCK_RFCOMM:
      status = btsock_rfc_listen(service_name, service_uuid, channel, sock_fd,
                                 flags, app_uid);
      break;
    case BTSOCK_L2CAP:
      status =
          btsock_l2cap_listen(service_name, channel, sock_fd, flags, app_uid);
      break;
    case BTSOCK_L2CAP_LE:
      if (flags & BTSOCK_FLAG_NO_SDP) {
        /* Set channel to zero so that it will be assigned */
        channel = 0;
      } else if (channel <= 0) {
        LOG_ERROR(LOG_TAG, "%s: type BTSOCK_L2CAP_LE: invalid channel=%d",
                  __func__, channel);
        break;
      }
      flags |= BTSOCK_FLAG_LE_COC;
      LOG_DEBUG(
          LOG_TAG,
          "%s: type=BTSOCK_L2CAP_LE, channel=0x%x, original=0x%x, flags=0x%x",
          __func__, channel, original_channel, flags);
      status =
          btsock_l2cap_listen(service_name, channel, sock_fd, flags, app_uid);
      break;
    case BTSOCK_SCO:
      status = btsock_sco_listen(sock_fd, flags);
      break;

    default:
      LOG_ERROR(LOG_TAG, "%s unknown/unsupported socket type: %d", __func__,
                type);
      status = BT_STATUS_UNSUPPORTED;
      break;
  }
  if (status != BT_STATUS_SUCCESS) {
    bluetooth::common::LogSocketConnectionState(
        RawAddress::kEmpty, 0, type,
        android::bluetooth::SocketConnectionstateEnum::
            SOCKET_CONNECTION_STATE_DISCONNECTED,
        0, 0, app_uid, channel, android::bluetooth::SOCKET_ROLE_LISTEN);
  }
  return status;
}

static bt_status_t btsock_connect(const RawAddress* bd_addr, btsock_type_t type,
                                  const Uuid* uuid, int channel, int* sock_fd,
                                  int flags, int app_uid) {
  CHECK(bd_addr != NULL);
  CHECK(sock_fd != NULL);

  *sock_fd = INVALID_FD;
  bt_status_t status = BT_STATUS_FAIL;

  bluetooth::common::LogSocketConnectionState(
      *bd_addr, 0, type,
      android::bluetooth::SocketConnectionstateEnum::
          SOCKET_CONNECTION_STATE_CONNECTING,
      0, 0, app_uid, channel, android::bluetooth::SOCKET_ROLE_CONNECTION);
  switch (type) {
    case BTSOCK_RFCOMM:
      status =
          btsock_rfc_connect(bd_addr, uuid, channel, sock_fd, flags, app_uid);
      break;

    case BTSOCK_L2CAP:
      status = btsock_l2cap_connect(bd_addr, channel, sock_fd, flags, app_uid);
      break;

    case BTSOCK_L2CAP_LE:
      flags |= BTSOCK_FLAG_LE_COC;
      LOG_DEBUG(LOG_TAG, "%s: type=BTSOCK_L2CAP_LE, channel=0x%x, flags=0x%x",
                __func__, channel, flags);
      status = btsock_l2cap_connect(bd_addr, channel, sock_fd, flags, app_uid);
      break;

    case BTSOCK_SCO:
      status = btsock_sco_connect(bd_addr, sock_fd, flags);
      break;

    default:
      LOG_ERROR(LOG_TAG, "%s unknown/unsupported socket type: %d", __func__,
                type);
      status = BT_STATUS_UNSUPPORTED;
      break;
  }
  if (status != BT_STATUS_SUCCESS) {
    bluetooth::common::LogSocketConnectionState(
        *bd_addr, 0, type,
        android::bluetooth::SocketConnectionstateEnum::
            SOCKET_CONNECTION_STATE_DISCONNECTED,
        0, 0, app_uid, channel, android::bluetooth::SOCKET_ROLE_CONNECTION);
  }
  return status;
}

static void btsock_request_max_tx_data_length(const RawAddress& remote_device) {
  const controller_t* controller = controller_get_interface();
  uint16_t max_len = controller->get_ble_maximum_tx_data_length();

  DVLOG(2) << __func__ << ": max_len=" << max_len;

  BTA_DmBleSetDataLength(remote_device, max_len);
}

static void btsock_signaled(int fd, int type, int flags, uint32_t user_id) {
  switch (type) {
    case BTSOCK_RFCOMM:
      btsock_rfc_signaled(fd, flags, user_id);
      break;
    case BTSOCK_L2CAP:
    case BTSOCK_L2CAP_LE:
      /* Note: The caller may not distinguish between BTSOCK_L2CAP and
       * BTSOCK_L2CAP_LE correctly */
      btsock_l2cap_signaled(fd, flags, user_id);
      break;
    default:
      LOG(FATAL) << "Invalid socket type! type=" << type << " fd=" << fd
                 << " flags=" << flags << " user_id=" << user_id;
      break;
  }
}