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/*****************************************************************************

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 *

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 * $Id$

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 *

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 ****************************************************************************/

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#include <iostream>

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#include <iomanip>

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#include <sstream>

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using namespace std;

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#include "globals.h"

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#include "sii_crc.h"

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/*****************************************************************************/

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const char *help_alias =

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    "[OPTIONS] <ALIAS>\n"

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    "\n"

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    "Write the secondary slave address (alias) for either\n"

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    "one or for multiple slaves.\n"

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    "\n"

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    "Arguments:\n"

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    "  ALIAS must be an unsigned 16 bit number. Zero means no alias.\n"

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    "\n"

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    "Command-specific options:\n"

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    "  --slave -s <index>  Positive numerical ring position, or 'all' for\n"

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    "                      all slaves (default). The --force option is\n"

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    "                      required in this case.\n"

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    "  --force             Acknowledge writing aliases of all slaves.\n"

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    "\n"

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    "Numerical values can be specified either with decimal (no prefix),\n"

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    "octal (prefix '0') or hexadecimal (prefix '0x') base.\n";

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/*****************************************************************************/

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void writeSlaveAlias(uint16_t, uint16_t);

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/*****************************************************************************/

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/** Writes the Secondary slave address (alias) to the slave's SII.

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 */

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void command_alias(void)

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{

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    uint16_t alias;

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    stringstream err, strAlias;

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    int number;

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    unsigned int numSlaves, i;

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    if (commandArgs.size() != 1) {

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        err << "'" << commandName << "' takes exactly one argument!";

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        throw InvalidUsageException(err);

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    }

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    strAlias << commandArgs[0];

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    strAlias

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        >> resetiosflags(ios::basefield) // guess base from prefix

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        >> number;

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    if (strAlias.fail() || number < 0x0000 || number > 0xffff) {

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        err << "Invalid alias '" << commandArgs[0] << "'!";

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        throw InvalidUsageException(err);

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    }

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    alias = number;

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    if (slavePosition == -1) {

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        if (!force) {

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            err << "This will write the alias addresses of all slaves to "

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                << alias << "! Please specify --force to proceed.";

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            throw CommandException(err);

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        }

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        masterDev.open(MasterDevice::ReadWrite);

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        numSlaves = masterDev.slaveCount();

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        for (i = 0; i < numSlaves; i++) {

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            writeSlaveAlias(i, alias);

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        }

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    } else {

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        masterDev.open(MasterDevice::ReadWrite);

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        writeSlaveAlias(slavePosition, alias);

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    }

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}

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/*****************************************************************************/

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/** Writes the Secondary slave address (alias) to the slave's SII.

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 */

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void writeSlaveAlias(

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        uint16_t slavePosition,

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        uint16_t alias

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        )

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{

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    ec_ioctl_slave_sii_t data;

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    ec_ioctl_slave_t slave;

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    stringstream err;

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    uint8_t crc;

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    masterDev.getSlave(&slave, slavePosition);

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    if (slave.sii_nwords < 8) {

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        err << "Current SII contents are too small to set an alias "

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            << "(" << slave.sii_nwords << " words)!";

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        throw CommandException(err);

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    }

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    // read first 8 SII words

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    data.slave_position = slavePosition;

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    data.offset = 0;

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    data.nwords = 8;

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    data.words = new uint16_t[data.nwords];

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    try {

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        masterDev.readSii(&data);

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    } catch (MasterDeviceException &e) {

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        delete [] data.words;

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        err << "Failed to read SII: " << e.what();

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        throw CommandException(err);

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    }

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    // write new alias address in word 4

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    data.words[4] = cputole16(alias);

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    // calculate checksum over words 0 to 6

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    crc = calcSiiCrc((const uint8_t *) data.words, 14);

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    // write new checksum into first byte of word 7

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    *(uint8_t *) (data.words + 7) = crc;

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    // write first 8 words with new alias and checksum

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    try {

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        masterDev.writeSii(&data);

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    } catch (MasterDeviceException &e) {

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        delete [] data.words;

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        err << "Failed to read SII: " << e.what();

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        throw CommandException(err);

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    }

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    delete [] data.words;

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}

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/*****************************************************************************/