/*
 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
 * Copyright (c) 2016, 2017 Nucleron R&D LLC <main@nucleron.ru>
 * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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: $Id: mbfuncholding_m.c, v 1.60 2013/09/02 14:13:40 Armink Add Master Functions  Exp $
 */
#include "mb_common.h"
#include "mb_proto.h"
#include "transport_common.h"
#include "mb_master.h"
/* ----------------------- Defines ------------------------------------------*/
#define MB_PDU_REQ_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_READ_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_READ_SIZE (4)
#define MB_PDU_FUNC_READ_REGCNT_MAX (0x007D)
#define MB_PDU_FUNC_READ_BYTECNT_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_READ_VALUES_OFF (MB_PDU_DATA_OFF + 1)
#define MB_PDU_FUNC_READ_SIZE_MIN (1)

#define MB_PDU_REQ_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_WRITE_VALUE_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_WRITE_SIZE (4)
#define MB_PDU_FUNC_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_WRITE_VALUE_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_FUNC_WRITE_SIZE (4)

#define MB_PDU_REQ_WRITE_MUL_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_WRITE_MUL_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF (MB_PDU_DATA_OFF + 4)
#define MB_PDU_REQ_WRITE_MUL_VALUES_OFF (MB_PDU_DATA_OFF + 5)
#define MB_PDU_REQ_WRITE_MUL_SIZE_MIN (5)
#define MB_PDU_REQ_WRITE_MUL_REGCNT_MAX (0x0078)
#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_FUNC_WRITE_MUL_SIZE (4)

#define MB_PDU_REQ_READWRITE_READ_ADDR_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_REQ_READWRITE_READ_REGCNT_OFF (MB_PDU_DATA_OFF + 2)
#define MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF (MB_PDU_DATA_OFF + 4)
#define MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF (MB_PDU_DATA_OFF + 6)
#define MB_PDU_REQ_READWRITE_WRITE_BYTECNT_OFF (MB_PDU_DATA_OFF + 8)
#define MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF (MB_PDU_DATA_OFF + 9)
#define MB_PDU_REQ_READWRITE_SIZE_MIN (9)
#define MB_PDU_FUNC_READWRITE_READ_BYTECNT_OFF (MB_PDU_DATA_OFF + 0)
#define MB_PDU_FUNC_READWRITE_READ_VALUES_OFF (MB_PDU_DATA_OFF + 1)
#define MB_PDU_FUNC_READWRITE_SIZE_MIN (1)

/* ----------------------- Static functions ---------------------------------*/
mb_exception_t mb_error_to_exception(mb_err_enum_t error_code);

/* ----------------------- Start implementation -----------------------------*/
#if MB_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED

#if MB_FUNC_WRITE_HOLDING_ENABLED

/**
 * This function will request write holding register.
 *
 * @param snd_addr salve address
 * @param reg_addr register start address
 * @param reg_data register data to be written
 * @param timeout timeout (-1 will waiting forever)
 *
 * @return error code
 */
mb_err_enum_t mbm_rq_write_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t reg_addr, uint16_t reg_data, uint32_t tout)
{
    uint8_t *mb_frame_ptr;
    if (snd_addr > MB_ADDRESS_MAX)
    {
        return MB_EINVAL;
    }
    if (!mb_port_event_res_take(inst->port_obj, tout))
    {
        return MB_EBUSY;
    }
    inst->get_send_buf(inst, &mb_frame_ptr);
    inst->set_dest_addr(inst, snd_addr);

    mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_WRITE_REGISTER;

    mb_frame_ptr[MB_PDU_REQ_WRITE_ADDR_OFF] = reg_addr >> 8;
    mb_frame_ptr[MB_PDU_REQ_WRITE_ADDR_OFF + 1] = reg_addr;

    mb_frame_ptr[MB_PDU_REQ_WRITE_VALUE_OFF] = reg_data >> 8;
    mb_frame_ptr[MB_PDU_REQ_WRITE_VALUE_OFF + 1] = reg_data;

    inst->set_send_len(inst, MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE);

    (void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
    return mb_port_event_wait_req_finish(inst->port_obj);
}

mb_exception_t mbm_fn_write_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
    mb_exception_t status = MB_EX_NONE;
    mb_err_enum_t reg_status = MB_EILLFUNC;

    if (*len_buf == (MB_PDU_SIZE_MIN + MB_PDU_FUNC_WRITE_SIZE))
    {
        uint16_t reg_address;
        reg_address = (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8);
        reg_address |= (uint16_t)(frame_ptr[MB_PDU_FUNC_WRITE_ADDR_OFF + 1]);
        reg_address++;

        /* Make callback to update the value. */
        if (inst->rw_cbs.reg_holding_cb)
        {
            reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_WRITE_VALUE_OFF], reg_address, 1, MB_REG_WRITE);
        }

        /* If an error occured convert it into a Modbus exception. */
        if (reg_status != MB_ENOERR)
        {
            status = mb_error_to_exception(reg_status);
        }
    }
    else
    {
        /* Can't be a valid request because the length is incorrect. */
        status = MB_EX_ILLEGAL_DATA_VALUE;
    }
    return status;
}
#endif

#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED

/**
 * This function will request write multiple holding register.
 *
 * @param snd_addr salve address
 * @param reg_addr register start address
 * @param reg_num register total number
 * @param data_ptr data to be written
 * @param timeout timeout (-1 will waiting forever)
 *
 * @return error code
 */
mb_err_enum_t mbm_rq_write_multi_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t reg_addr, uint16_t reg_num, uint16_t *data_ptr, uint32_t tout)
{
    uint8_t *mb_frame_ptr;
    uint16_t reg_idx = 0;

    if (!data_ptr || !inst || (snd_addr > MB_ADDRESS_MAX))
    {
        return MB_EINVAL;
    }
    if (!mb_port_event_res_take(inst->port_obj, tout))
    {
        return MB_EBUSY;
    }

    inst->get_send_buf(inst, &mb_frame_ptr);
    inst->set_dest_addr(inst, snd_addr);

    mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_WRITE_MULTIPLE_REGISTERS;

    mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF] = reg_addr >> 8;
    mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF + 1] = reg_addr;

    mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF] = reg_num >> 8;
    mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF + 1] = reg_num;

    mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF] = reg_num * 2;

    mb_frame_ptr += MB_PDU_REQ_WRITE_MUL_VALUES_OFF;

    while (reg_num > reg_idx)
    {
        *mb_frame_ptr++ = data_ptr[reg_idx] >> 8;
        *mb_frame_ptr++ = data_ptr[reg_idx++];
    }

    inst->set_send_len(inst, (MB_PDU_SIZE_MIN + MB_PDU_REQ_WRITE_MUL_SIZE_MIN + 2 * reg_num));

    (void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
    return mb_port_event_wait_req_finish(inst->port_obj);
}

mb_exception_t mbm_fn_write_multi_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
    mb_exception_t status = MB_EX_NONE;
    uint8_t *mb_frame_ptr;
    uint16_t reg_address;
    uint16_t reg_count;
    uint16_t byte_count;
    mb_err_enum_t reg_status = MB_EILLFUNC;

    /* If this request is broadcast, the *len_buf is not need check. */
    if ((*len_buf == MB_PDU_SIZE_MIN + MB_PDU_FUNC_WRITE_MUL_SIZE) || inst->transp_obj->frm_is_bcast(inst->transp_obj))
    {
        inst->get_send_buf(inst, &mb_frame_ptr);
        reg_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF] << 8);
        reg_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_ADDR_OFF + 1]);
        reg_address++;

        reg_count = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF] << 8);
        reg_count |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF + 1]);

        byte_count = mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF];

        if (byte_count == 2 * reg_count)
        {
            /* Make callback to update the register values. */
            if (inst->rw_cbs.reg_holding_cb)
            {
                reg_status = inst->rw_cbs.reg_holding_cb(inst, &mb_frame_ptr[MB_PDU_REQ_WRITE_MUL_VALUES_OFF],
                                                         reg_address, reg_count, MB_REG_WRITE);
            }
            /* If an error occured convert it into a Modbus exception. */
            if (reg_status != MB_ENOERR)
            {
                status = mb_error_to_exception(reg_status);
            }
        }
        else
        {
            status = MB_EX_ILLEGAL_DATA_VALUE;
        }
    }
    else
    {
        /* Can't be a valid request because the length is incorrect. */
        status = MB_EX_ILLEGAL_DATA_VALUE;
    }
    return status;
}
#endif

#if MB_FUNC_READ_HOLDING_ENABLED

/**
 * This function will request read holding register.
 *
 * @param snd_addr salve address
 * @param reg_addr register start address
 * @param reg_num register total number
 * @param timeout timeout (-1 will waiting forever)
 *
 * @return error code
 */
mb_err_enum_t mbm_rq_read_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t reg_addr, uint16_t reg_num, uint32_t tout)
{
    uint8_t *mb_frame_ptr;

    if (!inst || (snd_addr > MB_ADDRESS_MAX))
    {
        return MB_EINVAL;
    }
    if (!mb_port_event_res_take(inst->port_obj, tout))
    {
        return MB_EBUSY;
    }
    inst->get_send_buf(inst, &mb_frame_ptr);
    inst->set_dest_addr(inst, snd_addr);

    mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_READ_HOLDING_REGISTER;

    mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF] = reg_addr >> 8;
    mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF + 1] = reg_addr;

    mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF] = reg_num >> 8;
    mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF + 1] = reg_num;

    inst->set_send_len(inst, (MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE));

    (void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
    return mb_port_event_wait_req_finish(inst->port_obj);
}

mb_exception_t mbm_fn_read_holding_reg(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
    mb_exception_t status = MB_EX_NONE;
    uint8_t *mb_frame_ptr;
    uint16_t reg_address;
    uint16_t reg_count;
    mb_err_enum_t reg_status = MB_EILLFUNC;

    /* If this request is broadcast, and it's read mode. This request don't need execute. */
    bool is_broadcast = false;

    is_broadcast = inst->transp_obj->frm_is_bcast(inst->transp_obj);

    if (is_broadcast == true)
    {
        status = MB_EX_NONE;
    }
    else if (*len_buf >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN)
    {
        inst->get_send_buf(inst, &mb_frame_ptr);
        reg_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF] << 8);
        reg_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_ADDR_OFF + 1]);
        reg_address++;

        reg_count = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF] << 8);
        reg_count |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READ_REGCNT_OFF + 1]);
        /* Check if the number of registers to read is valid. If not
         * return Modbus illegal data value exception.
         */
        if ((reg_count >= 1) && (2 * reg_count == frame_ptr[MB_PDU_FUNC_READ_BYTECNT_OFF]))
        {
            /* Make callback to update the register values. */
            if (inst->rw_cbs.reg_holding_cb)
            {
                reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_READ_VALUES_OFF],
                                                         reg_address, reg_count, MB_REG_READ);
            }
            /* If an error occured convert it into a Modbus exception. */
            if (reg_status != MB_ENOERR)
            {
                status = mb_error_to_exception(reg_status);
            }
        }
        else
        {
            status = MB_EX_ILLEGAL_DATA_VALUE;
        }
    }
    else
    {
        /* Can't be a valid request because the length is incorrect. */
        status = MB_EX_ILLEGAL_DATA_VALUE;
    }
    return status;
}

#endif

#if MB_FUNC_READWRITE_HOLDING_ENABLED

/**
 * This function will request read and write holding register.
 *
 * @param snd_addr salve address
 * @param rd_reg_addr read register start address
 * @param rd_reg_num read register total number
 * @param data_ptr data to be written
 * @param wr_reg_addr write register start address
 * @param wr_reg_num write register total number
 * @param timeout timeout (-1 will waiting forever)
 *
 * @return error code
 */
mb_err_enum_t mbm_rq_rw_multi_holding_reg(mb_base_t *inst, uint8_t snd_addr, uint16_t rd_reg_addr,
                                          uint16_t rd_reg_num, uint16_t *data_ptr, uint16_t wr_reg_addr, uint16_t wr_reg_num, uint32_t tout)
{
    uint8_t *mb_frame_ptr;
    uint16_t reg_idx = 0;

    if (!data_ptr || !inst || (snd_addr > MB_ADDRESS_MAX))
    {
        return MB_EINVAL;
    }
    if (!mb_port_event_res_take(inst->port_obj, tout))
    {
        return MB_EBUSY;
    }
    inst->get_send_buf(inst, &mb_frame_ptr);
    inst->set_dest_addr(inst, snd_addr);

    mb_frame_ptr[MB_PDU_FUNC_OFF] = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;

    mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] = rd_reg_addr >> 8;
    mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF + 1] = rd_reg_addr;

    mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF] = rd_reg_num >> 8;
    mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF + 1] = rd_reg_num;

    mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF] = wr_reg_addr >> 8;
    mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF + 1] = wr_reg_addr;

    mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF] = wr_reg_num >> 8;
    mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF + 1] = wr_reg_num;
    mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_BYTECNT_OFF] = wr_reg_num * 2;

    mb_frame_ptr += MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF;

    while (wr_reg_num > reg_idx)
    {
        *mb_frame_ptr++ = data_ptr[reg_idx] >> 8;
        *mb_frame_ptr++ = data_ptr[reg_idx++];
    }

    inst->set_send_len(inst, (MB_PDU_SIZE_MIN + MB_PDU_REQ_READWRITE_SIZE_MIN + 2 * wr_reg_num));

    (void)mb_port_event_post(inst->port_obj, EVENT(EV_FRAME_TRANSMIT | EV_TRANS_START));
    return mb_port_event_wait_req_finish(inst->port_obj);
}

mb_exception_t mbm_fn_rw_multi_holding_regs(mb_base_t *inst, uint8_t *frame_ptr, uint16_t *len_buf)
{
    mb_exception_t status = MB_EX_NONE;
    mb_err_enum_t reg_status = MB_EILLFUNC;
    uint16_t reg_rd_cnt, reg_wr_cnt;
    uint16_t reg_rd_address, reg_wr_address;
    uint8_t *mb_frame_ptr;

    /* If this request is broadcast, and it's read mode. This request don't need execute. */
    if (inst->transp_obj->frm_is_bcast(inst->transp_obj))
    {
        status = MB_EX_NONE;
    }
    else if (*len_buf >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READWRITE_SIZE_MIN)
    {
        inst->get_send_buf(inst, &mb_frame_ptr);
        reg_rd_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] << 8);
        reg_rd_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_ADDR_OFF + 1]);
        reg_rd_address++;

        reg_rd_cnt = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF] << 8);
        reg_rd_cnt |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF + 1]);

        reg_wr_address = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF] << 8U);
        reg_wr_address |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF + 1]);
        reg_wr_address++;

        reg_wr_cnt = (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF] << 8U);
        reg_wr_cnt |= (uint16_t)(mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF + 1]);

        if ((2 * reg_rd_cnt) == frame_ptr[MB_PDU_FUNC_READWRITE_READ_BYTECNT_OFF])
        {
            /* Make callback to update the register values. */
            if (inst->rw_cbs.reg_holding_cb)
            {
                reg_status = inst->rw_cbs.reg_holding_cb(inst, &mb_frame_ptr[MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF],
                                                         reg_wr_address, reg_wr_cnt, MB_REG_WRITE);
            }

            if (reg_status == MB_ENOERR)
            {
                /* Make the read callback. */
                if (inst->rw_cbs.reg_holding_cb)
                {
                    reg_status = inst->rw_cbs.reg_holding_cb(inst, &frame_ptr[MB_PDU_FUNC_READWRITE_READ_VALUES_OFF],
                                                             reg_rd_address, reg_rd_cnt, MB_REG_READ);
                }
            }
            if (reg_status != MB_ENOERR)
            {
                status = mb_error_to_exception(reg_status);
            }
        }
        else
        {
            status = MB_EX_ILLEGAL_DATA_VALUE;
        }
    }
    return status;
}

#endif
#endif // #if MB_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED