/* Hey EMACS -*- linux-c -*- */
/* $Id: cmd89.c 3525 2007-06-26 13:31:39Z roms $ */

/*  libticalcs - Ti Calculator library, a part of the TiLP project
 *  Copyright (C) 1999-2005  Romain Liévin
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
  This unit handles TI89/92+/V200/TI89t commands.
*/

#include <string.h>

#include <ticonv.h>
#include "ticalcs.h"
#include "dbus_pkt.h"
#include "error.h"
#include "logging.h"
#include "macros.h"

#ifdef _MSC_VER
#pragma warning( disable : 4761 4244)
#endif

static uint8_t pc_ti9x(CalcModel model)
{
  switch (model) 
  {
  case CALC_TI89:
  case CALC_TI89T:
    return PC_TI89;
    break;
  case CALC_TI92P:
    return PC_TI92p;
    break;
  case CALC_V200:
    return PC_V200;
    break;
  default:
    return PC_TIXX;
    break;
  }
  return 0;
}

#define PC_TI9X pc_ti9x(handle->model)
#define TI9X_BKUP TI89_BKUP

static uint8_t dbus_errors[] = { 0x03, 0x25, 0x1e, 0x21, 0x07, 0x24 };

static int err_code(uint8_t *data)
{
	int i;
	int code = data[2];

	ticalcs_info(" TI->PC: SKP (%02x %02x %02x %02x %02x)", data[0], data[1], data[2], data[3], data[4]);
	for(i = 0; i < sizeof(dbus_errors) / sizeof(uint8_t); i++)
		if(dbus_errors[i] == code)
			return i+1;

	ticalcs_warning("D-BUS error code not found in list. Please report it at <tilp-devel@lists.sf.net>.");
	
	return 0;
}

int ti89_send_VAR_h(CalcHandle* handle, uint32_t varsize, uint8_t vartype, char *varname)
{
  uint8_t buffer[32];
  char trans[17];
  uint8_t extra = (vartype == TI9X_BKUP) ? 0 : 1;

  ticonv_varname_to_utf8_s(handle->model, varname, trans, vartype);

  buffer[0] = LSB(LSW(varsize));
  buffer[1] = MSB(LSW(varsize));
  buffer[2] = LSB(MSW(varsize));
  buffer[3] = MSB(MSW(varsize));
  buffer[4] = vartype;
  buffer[5] = strlen(varname);
  memcpy(buffer + 6, varname, strlen(varname));
  buffer[6 + strlen(varname)] = 0x03;

  ticalcs_info(" PC->TI: VAR (size=0x%08X=%i, id=%02X, name=%s)",
	  varsize, varsize, vartype, trans);
  TRYF(dbus_send(handle, PC_TI9X, CMD_VAR, 6 + strlen(varname) + extra, buffer));

  return 0;
}

int ti89_send_CTS_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: CTS");
  TRYF(dbus_send(handle, PC_TI9X, CMD_CTS, 2, NULL));

  return 0;
}

int ti89_send_XDP_h(CalcHandle* handle, uint32_t length, uint8_t * data)
{
  ticalcs_info(" PC->TI: XDP (0x%04X = %i)", length, length);
  TRYF(dbus_send(handle, PC_TI9X, CMD_XDP, length, data));

  return 0;
}

/*
  Skip variable
  - rej_code [in]: a rejection code
  - int [out]: an error code
 */
int ti89_send_SKP_h(CalcHandle* handle, uint8_t rej_code)
{
  uint8_t buffer[5] = { 0 };

  buffer[0] = rej_code;

  TRYF(dbus_send(handle, PC_TI9X, CMD_SKP, 3, buffer));
  ticalcs_info(" PC->TI: SKP (rejection code = %i)", rej_code);

  return 0;
}

int ti89_send_ACK_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: ACK");
  TRYF(dbus_send(handle, PC_TI9X, CMD_ACK, 2, NULL));

  return 0;
}

int ti89_send_ERR_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: ERR");
  TRYF(dbus_send(handle, PC_TI9X, CMD_ERR, 2, NULL));

  return 0;
}

int ti89_send_RDY_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: RDY?");
  TRYF(dbus_send(handle, PC_TI9X, CMD_RDY, 2, NULL));

  return 0;
}

int ti89_send_SCR_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: SCR");
  TRYF(dbus_send(handle, PC_TI9X, CMD_SCR, 2, NULL));

  return 0;
}

int ti89_send_CNT_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: CNT");
  TRYF(dbus_send(handle, PC_TI9X, CMD_CNT, 2, NULL));

  return 0;
}

int ti89_send_KEY_h(CalcHandle* handle, uint16_t scancode)
{
	uint8_t buf[5];

	buf[0] = PC_TI9X;
	buf[1] = CMD_KEY;
	buf[2] = LSB(scancode);
	buf[3] = MSB(scancode);

	ticalcs_info(" PC->TI: KEY");
	TRYF(ticables_cable_send(handle->cable, buf, 4));

	return 0;
}

int ti89_send_EOT_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: EOT");
  TRYF(dbus_send(handle, PC_TI9X, CMD_EOT, 2, NULL));

  return 0;
}

int ti89_send_REQ_h(CalcHandle* handle, uint32_t varsize, uint8_t vartype, char *varname)
{
  uint8_t buffer[32] = { 0 };
  uint16_t len;

  buffer[0] = LSB(LSW(varsize));
  buffer[1] = MSB(LSW(varsize));
  buffer[2] = LSB(MSW(varsize));
  buffer[3] = MSB(MSW(varsize));
  buffer[4] = vartype;
  buffer[5] = strlen(varname);
  memcpy(buffer + 6, varname, strlen(varname));
  buffer[6 + strlen(varname)] = 0x00;

  len = 6 + strlen(varname) + 1;
  if (vartype != TI89_CLK)
    len--;

  ticalcs_info(" PC->TI: REQ (size=0x%08X=%i, id=%02X, name=%s)",
	  varsize, varsize, vartype, varname);
  TRYF(dbus_send(handle, PC_TI9X, CMD_REQ, len, buffer));

  return 0;
}

int ti89_send_RTS_h(CalcHandle* handle, uint32_t varsize, uint8_t vartype, char *varname)
{
  uint8_t buffer[32] = { 0 };
  uint16_t len;

  buffer[0] = LSB(LSW(varsize));
  buffer[1] = MSB(LSW(varsize));
  buffer[2] = LSB(MSW(varsize));
  buffer[3] = MSB(MSW(varsize));
  buffer[4] = vartype;
  buffer[5] = strlen(varname);
  memcpy(buffer + 6, varname, strlen(varname));
  buffer[6 + strlen(varname)] = 0x00;

  len = 6 + strlen(varname) + 1;
  // used by AMS <= 2.09 ?
  //if ((vartype == TI89_AMS) || (vartype == TI89_APPL)) len--;

  ticalcs_info(" PC->TI: RTS (size=0x%08X=%i, id=%02X, name=%s)",
	  varsize, varsize, vartype, varname);
  TRYF(dbus_send(handle, PC_TI9X, CMD_RTS, len, buffer));

  return 0;
}

int ti89_send_RTS2_h(CalcHandle* handle, uint32_t varsize, uint8_t vartype, uint8_t hw_id)
{
  uint8_t buffer[32] = { 0 };
  uint16_t len;

  buffer[0] = LSB(LSW(varsize));
  buffer[1] = MSB(LSW(varsize));
  buffer[2] = LSB(MSW(varsize));
  buffer[3] = MSB(MSW(varsize));
  buffer[4] = vartype;
  buffer[5] = 0x00;
  buffer[6] = 0x08;
  buffer[7] = 0x00;
  buffer[8] = hw_id;	// 0x08 -> V200, 0x09 -> Titanium (Hardware ID)
  len = 9;

  ticalcs_info(" PC->TI: RTS (size=0x%08X=%i, id=%02X, hw_id=%02x)",
	  varsize, varsize, vartype, hw_id);
  TRYF(dbus_send(handle, PC_TI9X, CMD_RTS, len, buffer));

  return 0;
}

int ti89_send_VER_h(CalcHandle* handle)
{
  ticalcs_info(" PC->TI: VER");
  TRYF(dbus_send(handle, PC_TI9X, CMD_VER, 2, NULL));

  return 0;
}

int ti89_send_DEL_h(CalcHandle* handle, uint32_t varsize, uint8_t vartype, char *varname)
{
  uint8_t buffer[32] = { 0 };
  uint16_t len;

  buffer[0] = 0;
  buffer[1] = 0;
  buffer[2] = 0;
  buffer[3] = 0;
  buffer[4] = 0;
  buffer[5] = strlen(varname);
  memcpy(buffer + 6, varname, strlen(varname));

  len = 6 + strlen(varname);

  ticalcs_info(" PC->TI: DEL (size=0x%08X=%i, id=%02X, name=%s)",
	  varsize, varsize, vartype, varname);
  TRYF(dbus_send(handle, PC_TI9X, CMD_DEL, len, buffer));

  return 0;
}

/* Variable (std var header: variable length) */
int ti89_recv_VAR_h(CalcHandle* handle, uint32_t * varsize, uint8_t * vartype, char *varname)
{
  uint8_t host, cmd;
  uint8_t *buffer = (uint8_t *)handle->priv2;
  uint16_t length;
  uint8_t strl;
  uint8_t flag;

  TRYF(dbus_recv(handle, &host, &cmd, &length, buffer));

  if (cmd == CMD_EOT)
    return ERR_EOT;		// not really an error

  if (cmd == CMD_SKP)
    return ERR_CALC_ERROR1 + err_code(buffer);

  if (cmd != CMD_VAR)
    return ERR_INVALID_CMD;

  *varsize = buffer[0] | (buffer[1] << 8) |
      (buffer[2] << 16) | (buffer[3] << 24);
  *vartype = buffer[4];
  strl = buffer[5];
  memcpy(varname, buffer + 6, strl);
  varname[strl] = '\0';
  flag = buffer[6 + strl];

  if ((length != (6 + strlen(varname))) &&
      (length != (7 + strlen(varname))))
    return ERR_INVALID_PACKET;

  ticalcs_info(" TI->PC: VAR (size=0x%08X=%i, id=%02X, name=%s, flag=%i)",
	  *varsize, *varsize, *vartype, varname, flag);

  return 0;
}

int ti89_recv_CTS_h(CalcHandle* handle)
{
  uint8_t host, cmd;
  uint16_t length;
  uint8_t *buffer = (uint8_t *)handle->priv2;

  TRYF(dbus_recv(handle, &host, &cmd, &length, buffer));

  if (cmd == CMD_SKP)
    return ERR_CALC_ERROR1 + err_code(buffer);

  if (cmd != CMD_CTS)
    return ERR_INVALID_CMD;

  if (length != 0x0000)
    return ERR_CTS_ERROR;

  ticalcs_info(" TI->PC: CTS");

  return 0;
}

int ti89_recv_SKP_h(CalcHandle* handle, uint8_t * rej_code)
{
  uint8_t host, cmd;
  uint16_t length;
  uint8_t *buffer = (uint8_t *)handle->priv2;
  *rej_code = 0;

  TRYF(dbus_recv(handle, &host, &cmd, &length, buffer));

  if (cmd == CMD_CTS) 
  {
    ticalcs_info("CTS");
    return 0;
  }

  if (cmd != CMD_SKP)
    return ERR_INVALID_CMD;

  ticalcs_info(" TI->PC: SKP (rejection code = %i)", *rej_code = buffer[0]);

  return 0;
}

int ti89_recv_XDP_h(CalcHandle* handle, uint32_t * length, uint8_t * data)
{
  uint8_t host, cmd = CMD_XDP;
  int err;
  uint16_t len;

  err = dbus_recv(handle, &host, &cmd, &len, data);
  *length = len;

  if (cmd != CMD_XDP)
    return ERR_INVALID_CMD;

  TRYF(err);

  ticalcs_info(" TI->PC: XDP (%04X=%i bytes)", *length, *length);

  return 0;
}

/*
  Receive acknowledge
  - status [in/out]: if NULL is passed, the function checks that 00 00 has
  been received. Otherwise, it put in status the received value.
  - int [out]: an error code
*/
int ti89_recv_ACK_h(CalcHandle* handle, uint16_t * status)
{
  uint8_t host, cmd;
  uint16_t length;
  uint8_t *buffer = (uint8_t *)handle->priv2;

  TRYF(dbus_recv(handle, &host, &cmd, &length, buffer));

  if (cmd == CMD_SKP)
    return ERR_CALC_ERROR1 + err_code(buffer);

  if (status != NULL)
    *status = length;
  else if (length != 0x0000)
    return ERR_NACK;

  if (cmd != CMD_ACK)
    return ERR_INVALID_CMD;

  ticalcs_info(" TI->PC: ACK");

  return 0;
}

int ti89_recv_CNT_h(CalcHandle* handle)
{
  uint8_t host, cmd;
  uint16_t sts;

  TRYF(dbus_recv(handle, &host, &cmd, &sts, NULL));

  if (cmd == CMD_EOT)
    return ERR_EOT;		// not really an error

  if (cmd != CMD_CNT)
    return ERR_INVALID_CMD;

  ticalcs_info(" TI->PC: CNT");

  return 0;
}

int ti89_recv_EOT_h(CalcHandle* handle)
{
  uint8_t host, cmd;
  uint16_t length;

  TRYF(dbus_recv(handle, &host, &cmd, &length, NULL));

  if (cmd != CMD_EOT)
    return ERR_INVALID_CMD;

  ticalcs_info(" TI->PC: EOT");

  return 0;
}

int ti89_recv_RTS_h(CalcHandle* handle, uint32_t * varsize, uint8_t * vartype, char *varname)
{
  uint8_t host, cmd;
  uint8_t *buffer = (uint8_t *)handle->priv2;
  uint16_t length;
  uint8_t strl;

  TRYF(dbus_recv(handle, &host, &cmd, &length, buffer));

  if (cmd == CMD_EOT)
    return ERR_EOT;		// not really an error

  if (cmd == CMD_SKP)
    return ERR_CALC_ERROR1 + err_code(buffer);

  if (cmd != CMD_VAR)
    return ERR_INVALID_CMD;

  *varsize = buffer[0] | (buffer[1] << 8) |
      (buffer[2] << 16) | (buffer[3] << 24);
  *vartype = buffer[4];
  strl = buffer[5];
  memcpy(varname, buffer + 6, strl);
  varname[strl] = '\0';

  if (length != (6 + strlen(varname)))
    return ERR_INVALID_PACKET;

  ticalcs_info(" TI->PC: RTS (size=0x%08X=%i, id=%02X, name=%s)",
	  *varsize, *varsize, *vartype, varname);

  return 0;
}