/******************************************************************************
 *
 *  Copyright (C) 2009-2012 Broadcom Corporation
 *
 *  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.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  Filename:      bta_pan_co.c
 *
 *  Description:   PAN stack callout api
 *
 *
 ******************************************************************************/
#include "bta_pan_co.h"
#include <base/logging.h>
#include <hardware/bluetooth.h>
#include <hardware/bt_pan.h>
#include <string.h>
#include "bt_common.h"
#include "bta_api.h"
#include "bta_pan_api.h"
#include "bta_pan_ci.h"
#include "btif_pan_internal.h"
#include "btif_sock_thread.h"
#include "btif_util.h"
#include "osi/include/osi.h"
#include "pan_api.h"

/*******************************************************************************
 *
 * Function         bta_pan_co_init
 *
 * Description
 *
 *
 * Returns          Data flow mask.
 *
 ******************************************************************************/
uint8_t bta_pan_co_init(uint8_t* q_level) {
  BTIF_TRACE_API("bta_pan_co_init");

  /* set the q_level to 30 buffers */
  *q_level = 30;

  // return (BTA_PAN_RX_PULL | BTA_PAN_TX_PULL);
  return (BTA_PAN_RX_PUSH_BUF | BTA_PAN_RX_PUSH | BTA_PAN_TX_PULL);
}

/******************************************************************************
 *
 * Function         bta_pan_co_open
 *
 * Description
 *
 *
 *
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_open(uint16_t handle, uint8_t app_id, tBTA_PAN_ROLE local_role,
                     tBTA_PAN_ROLE peer_role, const RawAddress& peer_addr) {
  BTIF_TRACE_API(
      "bta_pan_co_open:app_id:%d, local_role:%d, peer_role:%d, "
      "handle:%d",
      app_id, local_role, peer_role, handle);
  btpan_conn_t* conn = btpan_find_conn_addr(peer_addr);
  if (conn == NULL)
    conn = btpan_new_conn(handle, peer_addr, local_role, peer_role);
  if (conn) {
    BTIF_TRACE_DEBUG(
        "bta_pan_co_open:tap_fd:%d, open_count:%d, "
        "conn->handle:%d should = handle:%d, local_role:%d, remote_role:%d",
        btpan_cb.tap_fd, btpan_cb.open_count, conn->handle, handle,
        conn->local_role, conn->remote_role);
    // refresh the role & bt address

    btpan_cb.open_count++;
    conn->handle = handle;
    // conn->peer = peer_addr;
    if (btpan_cb.tap_fd < 0) {
      btpan_cb.tap_fd = btpan_tap_open();
      if (btpan_cb.tap_fd >= 0) create_tap_read_thread(btpan_cb.tap_fd);
    }
    if (btpan_cb.tap_fd >= 0) {
      btpan_cb.flow = 1;
      conn->state = PAN_STATE_OPEN;
      bta_pan_ci_rx_ready(handle);
    }
  }
}

/*******************************************************************************
 *
 * Function         bta_pan_co_close
 *
 * Description      This function is called by PAN when a connection to a
 *                  peer is closed.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_close(uint16_t handle, uint8_t app_id) {
  BTIF_TRACE_API("bta_pan_co_close:app_id:%d, handle:%d", app_id, handle);
  btpan_conn_t* conn = btpan_find_conn_handle(handle);
  if (conn && conn->state == PAN_STATE_OPEN) {
    BTIF_TRACE_DEBUG("bta_pan_co_close");

    // let bta close event reset this handle as it needs
    // the handle to find the connection upon CLOSE
    // conn->handle = -1;
    conn->state = PAN_STATE_CLOSE;
    btpan_cb.open_count--;

    if (btpan_cb.open_count == 0 && btpan_cb.tap_fd != -1) {
      btpan_tap_close(btpan_cb.tap_fd);
      btpan_cb.tap_fd = -1;
    }
  }
}

/*******************************************************************************
 *
 * Function         bta_pan_co_tx_path
 *
 * Description      This function is called by PAN to transfer data on the
 *                  TX path; that is, data being sent from BTA to the phone.
 *                  This function is used when the TX data path is configured
 *                  to use the pull interface.  The implementation of this
 *                  function will typically call Bluetooth stack functions
 *                  PORT_Read() or PORT_ReadData() to read data from RFCOMM
 *                  and then a platform-specific function to send data that
 *                  data to the phone.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_tx_path(uint16_t handle, uint8_t app_id) {
  BT_HDR* p_buf;
  RawAddress src;
  RawAddress dst;
  uint16_t protocol;
  bool ext;
  bool forward;

  BTIF_TRACE_API("%s, handle:%d, app_id:%d", __func__, handle, app_id);

  btpan_conn_t* conn = btpan_find_conn_handle(handle);
  if (!conn) {
    BTIF_TRACE_ERROR("%s: cannot find pan connection", __func__);
    return;
  } else if (conn->state != PAN_STATE_OPEN) {
    BTIF_TRACE_ERROR("%s: conn is not opened, conn:%p, conn->state:%d",
                     __func__, conn, conn->state);
    return;
  }

  do {
    /* read next data buffer from pan */
    p_buf = bta_pan_ci_readbuf(handle, src, dst, &protocol, &ext, &forward);
    if (p_buf) {
      BTIF_TRACE_DEBUG(
          "%s, calling btapp_tap_send, "
          "p_buf->len:%d, offset:%d",
          __func__, p_buf->len, p_buf->offset);
      if (is_empty_eth_addr(conn->eth_addr) && is_valid_bt_eth_addr(src)) {
        VLOG(1) << __func__ << " pan bt peer addr: " << conn->peer
                << " update its ethernet addr: " << src;
        conn->eth_addr = src;
      }
      btpan_tap_send(btpan_cb.tap_fd, src, dst, protocol,
                     (char*)(p_buf + 1) + p_buf->offset, p_buf->len, ext,
                     forward);
      osi_free(p_buf);
    }

  } while (p_buf != NULL);
}

/*******************************************************************************
 *
 * Function         bta_pan_co_rx_path
 *
 * Description
 *
 *
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_rx_path(UNUSED_ATTR uint16_t handle,
                        UNUSED_ATTR uint8_t app_id) {
  BTIF_TRACE_API("bta_pan_co_rx_path not used");
}

/*******************************************************************************
 *
 * Function         bta_pan_co_tx_write
 *
 * Description      This function is called by PAN to send data to the phone
 *                  when the TX path is configured to use a push interface.
 *                  The implementation of this function must copy the data to
 *                  the phone's memory.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_tx_write(UNUSED_ATTR uint16_t handle,
                         UNUSED_ATTR uint8_t app_id,
                         UNUSED_ATTR const RawAddress& src,
                         UNUSED_ATTR const RawAddress& dst,
                         UNUSED_ATTR uint16_t protocol,
                         UNUSED_ATTR uint8_t* p_data, UNUSED_ATTR uint16_t len,
                         UNUSED_ATTR bool ext, UNUSED_ATTR bool forward) {
  BTIF_TRACE_API("bta_pan_co_tx_write not used");
}

/*******************************************************************************
 *
 * Function         bta_pan_co_tx_writebuf
 *
 * Description      This function is called by PAN to send data to the phone
 *                  when the TX path is configured to use a push interface with
 *                  zero copy.  The phone must free the buffer using function
 *                  osi_free() when it is through processing the buffer.
 *
 *
 * Returns          true if flow enabled
 *
 ******************************************************************************/
void bta_pan_co_tx_writebuf(UNUSED_ATTR uint16_t handle,
                            UNUSED_ATTR uint8_t app_id,
                            UNUSED_ATTR const RawAddress& src,
                            UNUSED_ATTR const RawAddress& dst,
                            UNUSED_ATTR uint16_t protocol,
                            UNUSED_ATTR BT_HDR* p_buf, UNUSED_ATTR bool ext,
                            UNUSED_ATTR bool forward) {
  BTIF_TRACE_API("bta_pan_co_tx_writebuf not used");
}

/*******************************************************************************
 *
 * Function         bta_pan_co_rx_flow
 *
 * Description      This function is called by PAN to enable or disable
 *                  data flow on the RX path when it is configured to use
 *                  a push interface.  If data flow is disabled the phone must
 *                  not call bta_pan_ci_rx_write() or bta_pan_ci_rx_writebuf()
 *                  until data flow is enabled again.
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_rx_flow(UNUSED_ATTR uint16_t handle, UNUSED_ATTR uint8_t app_id,
                        UNUSED_ATTR bool enable) {
  BTIF_TRACE_API("bta_pan_co_rx_flow, enabled:%d, not used", enable);
  btpan_conn_t* conn = btpan_find_conn_handle(handle);
  if (!conn || conn->state != PAN_STATE_OPEN) return;
  btpan_set_flow_control(enable);
}

/*******************************************************************************
 *
 * Function         bta_pan_co_filt_ind
 *
 * Description      protocol filter indication from peer device
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_pfilt_ind(UNUSED_ATTR uint16_t handle,
                          UNUSED_ATTR bool indication,
                          UNUSED_ATTR tBTA_PAN_STATUS result,
                          UNUSED_ATTR uint16_t len,
                          UNUSED_ATTR uint8_t* p_filters) {
  BTIF_TRACE_API("bta_pan_co_pfilt_ind");
}

/*******************************************************************************
 *
 * Function         bta_pan_co_mfilt_ind
 *
 * Description      multicast filter indication from peer device
 *
 * Returns          void
 *
 ******************************************************************************/
void bta_pan_co_mfilt_ind(UNUSED_ATTR uint16_t handle,
                          UNUSED_ATTR bool indication,
                          UNUSED_ATTR tBTA_PAN_STATUS result,
                          UNUSED_ATTR uint16_t len,
                          UNUSED_ATTR uint8_t* p_filters) {
  BTIF_TRACE_API("bta_pan_co_mfilt_ind");
}