#include <host-ipmid/ipmid-api.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "writefrudata.H"

void register_netfn_storage_write_fru() __attribute__((constructor));

sd_bus* ipmid_get_sd_bus_connection(void);

///-------------------------------------------------------
// Called by IPMI netfn router for write fru data command
//--------------------------------------------------------
ipmi_ret_t ipmi_storage_write_fru_data(ipmi_netfn_t netfn, ipmi_cmd_t cmd, 
                              ipmi_request_t request, ipmi_response_t response, 
                              ipmi_data_len_t data_len, ipmi_context_t context)
{
    FILE *fp = NULL;
    char fru_file_name[16] = {0};
    uint8_t offset = 0;
    uint16_t len = 0;
    ipmi_ret_t rc = IPMI_CC_INVALID;
    const char *mode = NULL;

    // From the payload, extract the header that has fruid and the offsets
    write_fru_data_t *reqptr = (write_fru_data_t*)request;

    // Maintaining a temporary file to pump the data
    sprintf(fru_file_name, "%s%02x", "/tmp/ipmifru", reqptr->frunum);

    offset = ((uint16_t)reqptr->offsetms) << 8 | reqptr->offsetls;

    // Length is the number of request bytes minus the header itself.
    // The header contains an extra byte to indicate the start of
    // the data (so didn't need to worry about word/byte boundaries)
    // hence the -1...
    len = ((uint16_t)*data_len) - (sizeof(write_fru_data_t)-1);

    // On error there is no response data for this command.
    *data_len = 0;
    
#ifdef __IPMI__DEBUG__
    printf("IPMI WRITE-FRU-DATA for [%s]  Offset = [%d] Length = [%d]\n",
            fru_file_name, offset, len);
#endif


    if( access( fru_file_name, F_OK ) == -1 ) {
        mode = "wb";
    } else {
        mode = "rb+";
    }

    if ((fp = fopen(fru_file_name, mode)) != NULL)
    {
        if(fseek(fp, offset, SEEK_SET))
        {
            perror("Error:");
            fclose(fp);
            return rc;
        }
    
        if(fwrite(&reqptr->data, len, 1, fp) != 1)
        {
            perror("Error:");
            fclose(fp);
            return rc;
        }
    
        fclose(fp);
    } 
    else 
    {
        fprintf(stderr, "Error trying to write to fru file %s\n",fru_file_name);
        return rc;
    }


    // If we got here then set the resonse byte
    // to the number of bytes written
    memcpy(response, &len, 1);
    *data_len = 1;
    rc = IPMI_CC_OK;

	// Get the reference to global sd_bus object
	sd_bus *bus_type = ipmid_get_sd_bus_connection();

    // Do not need to update present status in the inventory. Its only for
    // eeprom requirement at this moment. But we may have a need in the future
    bool set_present = false;

    // We received some bytes. It may be full or partial. Send a valid
    // FRU file to the inventory controller on DBus for the correct number
    ipmi_validate_fru_area(reqptr->frunum, fru_file_name, bus_type, set_present);

    return rc;
}

//-------------------------------------------------------
// Registering WRITE FRU DATA command handler with daemon
//-------------------------------------------------------
void register_netfn_storage_write_fru()
{
    printf("Registering NetFn:[0x%X], Cmd:[0x%X]\n",NETFUN_STORAGE, IPMI_CMD_WRITE_FRU_DATA);
    ipmi_register_callback(NETFUN_STORAGE, IPMI_CMD_WRITE_FRU_DATA, NULL, ipmi_storage_write_fru_data);
}