/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 * @brief
 *   This file includes the (posix or windows) platform-specific initializers.
 */

#ifndef PLATFORM_POSIX_H_
#define PLATFORM_POSIX_H_

#include <openthread-core-config.h>
#include <openthread/config.h>

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#if _WIN32
#include <WS2tcpip.h>
#include <WinSock2.h>
#include <windows.h>
#define POLL WSAPoll
#define ssize_t int
#include <time.h>
#define localtime _localtime32
// In user mode, define some Linux functions
__forceinline int gettimeofday(struct timeval *tv, struct timezone *tz)
{
    (void)tz;
    tv->tv_sec  = _time32(NULL);
    tv->tv_usec = 0;
    return 0;
}
__forceinline void timersub(struct timeval *a, struct timeval *b, struct timeval *res)
{
    res->tv_sec  = (long)_difftime32(a->tv_sec, b->tv_sec);
    res->tv_usec = 0;
}
#else
#include <arpa/inet.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <poll.h>
#include <signal.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#define POLL poll
#endif

#include <openthread/instance.h>

#include "openthread-core-config.h"
#include "platform-config.h"

enum
{
    OT_SIM_EVENT_ALARM_FIRED        = 0,
    OT_SIM_EVENT_RADIO_RECEIVED     = 1,
    OT_SIM_EVENT_UART_WRITE         = 2,
    OT_SIM_EVENT_RADIO_SPINEL_WRITE = 3,
    OT_EVENT_DATA_MAX_SIZE          = 1024,
};

OT_TOOL_PACKED_BEGIN
struct Event
{
    uint64_t mDelay;
    uint8_t  mEvent;
    uint16_t mDataLength;
    uint8_t  mData[OT_EVENT_DATA_MAX_SIZE];
} OT_TOOL_PACKED_END;

enum
{
    WELLKNOWN_NODE_ID = 34, ///< Well-known Unique ID used by a simulated radio that supports promiscuous mode.
};

/**
 * Unique node ID.
 *
 */
extern uint32_t gNodeId;

/**
 * This function initializes the alarm service used by OpenThread.
 *
 */
void platformAlarmInit(uint32_t aSpeedUpFactor);

/**
 * This function retrieves the time remaining until the alarm fires.
 *
 * @param[out]  aTimeval  A pointer to the timeval struct.
 *
 */
void platformAlarmUpdateTimeout(struct timeval *tv);

/**
 * This function performs alarm driver processing.
 *
 * @param[in]  aInstance  The OpenThread instance structure.
 *
 */
void platformAlarmProcess(otInstance *aInstance);

/**
 * This function returns the next alarm event time.
 *
 * @returns The next alarm fire time.
 *
 */
int32_t platformAlarmGetNext(void);

/**
 * This function returns the current alarm time.
 *
 * @returns The current alarm time.
 *
 */
uint64_t platformAlarmGetNow(void);

/**
 * This function advances the alarm time by @p aDelta.
 *
 * @param[in]  aDelta  The amount of time to advance.
 *
 */
void platformAlarmAdvanceNow(uint64_t aDelta);

/**
 * This function initializes the radio service used by OpenThread.
 *
 */
void platformRadioInit(void);

/**
 * This function shuts down the radio service used by OpenThread.
 *
 */
void platformRadioDeinit(void);

/**
 * This function inputs a received radio frame.
 *
 * @param[in]  aInstance   A pointer to the OpenThread instance.
 * @param[in]  aBuf        A pointer to the received radio frame.
 * @param[in]  aBufLength  The size of the received radio frame.
 *
 */
void platformRadioReceive(otInstance *aInstance, uint8_t *aBuf, uint16_t aBufLength);

/**
 * This function updates the file descriptor sets with file descriptors used by the radio driver.
 *
 * @param[inout]  aReadFdSet   A pointer to the read file descriptors.
 * @param[inout]  aWriteFdSet  A pointer to the write file descriptors.
 * @param[inout]  aMaxFd       A pointer to the max file descriptor.
 *
 */
void platformRadioUpdateFdSet(fd_set *aReadFdSet, fd_set *aWriteFdSet, int *aMaxFd);

/**
 * This function performs radio driver processing.
 *
 * @param[in]  aInstance  The OpenThread instance structure.
 *
 */
void platformRadioProcess(otInstance *aInstance);

/**
 * This function initializes the random number service used by OpenThread.
 *
 */
void platformRandomInit(void);

/**
 * This function updates the file descriptor sets with file descriptors used by the UART driver.
 *
 * @param[inout]  aReadFdSet   A pointer to the read file descriptors.
 * @param[inout]  aWriteFdSet  A pointer to the write file descriptors.
 * @param[inout]  aMaxFd       A pointer to the max file descriptor.
 *
 */
void platformUartUpdateFdSet(fd_set *aReadFdSet, fd_set *aWriteFdSet, fd_set *aErrorFdSet, int *aMaxFd);

/**
 * This function performs radio driver processing.
 *
 */
void platformUartProcess(void);

/**
 * This function restores the Uart.
 *
 */
void platformUartRestore(void);

/**
 * This function sends a simulation event.
 *
 * @param[in]   aEvent  A pointer to the simulation event to send
 *
 */
void otSimSendEvent(const struct Event *aEvent);

/**
 * This function sends Uart data through simulation.
 *
 * @param[in]   aData       A pointer to the UART data.
 * @param[in]   aLength     Length of UART data.
 *
 */
void otSimSendUartWriteEvent(const uint8_t *aData, uint16_t aLength);

#endif // PLATFORM_POSIX_H_