/*
 * Copyright (c) 2001 Tommy Bohlin <tommy@gatespace.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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */
/* commclt.c
 */

#include <irda.h>
#include <comm.h>

/**********************************************************************
 * Constants
 **********************************************************************/

static const char id_client[]="comm client";

/**********************************************************************
 * Data structures
 **********************************************************************/

typedef struct Port {
  int id;
  int lsap;
  int st;
  int pt;
} Port;

typedef struct COMMClientPrivate {
  COMMClient comm;
  LAP* lap;
  int state;
#define STATE_GET_LSAPS               1
#define STATE_GET_PARAMETERS          2
#define STATE_LIVE                    3
#define STATE_CLOSED                  0
  IASClient* ias;
  Connection* con;
  int stMask;
  int ptMask;
#define NPORTS                        10
  Port ports[NPORTS];

  /* Communication state */
  int serviceType;
  bool isDCE;
  int dce;
  int dte;

} COMMClientPrivate;

/**********************************************************************
 * Internal functions
 **********************************************************************/

static int parseControl(COMMClientPrivate* commp, const u_char* buf, int len)
{
  int i,len1;

  if(len<1) return 0;
  len1=buf[0]+1;
  if(len1>len) return -1;
  i=1;
  while(i+1<len1) {
    int pi=buf[i];
    int pl=buf[i+1];
    int pv=pl<=4 ? getBEVariable(buf+i+2,pl) : 0;
    if(i+2+pl>len1) return -1;

    switch(pi) {
    case PI_SERVICE_TYPE:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("service type %x\n",pv);
      break;
    case PI_PORT_TYPE:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("port type %x\n",pv);
      break;
    case PI_FIXED_PORT_NAME:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("fixed port name %.*s\n",pl,buf+i+2);
      break;
    case PI_DATA_RATE:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("data rate %d\n",pv);
      break;
    case PI_DATA_FORMAT:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("data format %x\n",pv);
      break;
    case PI_FLOW_CONTROL:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("flow control %x\n",pv);
      break;
    case PI_XON_XOFF:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("xon/xoff %x\n",pv);
      break;
    case PI_ENQ_ACK:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("enq/ack %x\n",pv);
      break;
    case PI_DTE:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("DTE %x\n",pv);
      commp->dte=pv&(COMM_DTR|COMM_RTS);
      break;
    case PI_DCE:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("DCE %x\n",pv);
      commp->dce&=pv&(COMM_CTS|COMM_DSR|COMM_RI|COMM_CD);
      break;
    case PI_POLL_LINE_SETTINGS:
      birda_log("poll line settings is NYI\n");
    default:
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("pi=%x pl=%d\n",pi,pl);
      break;
    }

    i+=2+pl;
  }
  if(i!=len1) return -1;
  return len1;
}

static void checkParameters(COMMClientPrivate* commp)
{
  for(;;) {
    int i,id,type=iasCltResType(commp->ias);

    if(type==IAS_NONE) break;
    if(type!=IAS_OCTETS) continue;

    id=iasCltResId(commp->ias);
    
    for(i=0;i<NPORTS;i++) {
      if(commp->ports[i].id==id) {
	u_char* p=iasCltResPtr(commp->ias);
	int n=iasCltResLength(commp->ias);
	commp->ports[i].st=getBEParameter(PI_SERVICE_TYPE,0,p,n);
	commp->ports[i].pt=getBEParameter(PI_PORT_TYPE,COMM_PT_SERIAL|COMM_PT_PARALLEL,p,n);
	break;
      }
    }
    iasCltResNext(commp->ias);
  }
}

static void checkLsaps(COMMClientPrivate* commp)
{
  int i=0;

  while(i<NPORTS) {
    int type=iasCltResType(commp->ias);

    if(type==IAS_NONE) break;
    if(type!=IAS_INT) continue;

    commp->ports[i].id=iasCltResId(commp->ias);
    commp->ports[i].lsap=iasCltResInt(commp->ias);

    i++;
    iasCltResNext(commp->ias);
  }
  while(i<NPORTS) commp->ports[i++].lsap=0;
}

static void connData(Connection* con, void* buf0, int len)
{
  u_char* buf=(u_char*)buf0;
  COMMClientPrivate* commp=(COMMClientPrivate*)con->handle;
  COMMClient* comm=&commp->comm;
  int len1=parseControl(commp,buf,len);

  if(len1>=0 && len1<len && comm->data) comm->data(comm,buf+len1,len-len1);
}

static void connStatus(Connection* con, int event, void* buf, int len)
{
  COMMClient* comm=(COMMClient*)con->handle;
  switch(event) {
  case CONN_OPENED:
    if(comm->status) comm->status(comm,COMM_CONNECTED);
    if(len>0) connData(con,buf,len);
    break;
  case CONN_CLOSED:
    if(comm->status) comm->status(comm,COMM_DISCONNECTED);
    break;
  }
}

static void choosePort(COMMClientPrivate* commp)
{
  u_char buf[32];
  int i,len;

  for(i=0;i<NPORTS;i++) {
    int lsap=commp->ports[i].lsap;
    int pt=commp->ports[i].pt&commp->ptMask;
    int st=commp->ports[i].st&commp->stMask;

    if(!lsap || !pt || !st) continue;

    if (st&COMM_ST_CENTRONICS) {
      birda_log("centronics protocol is NYI\n");
    } else if(st&COMM_ST_9WIRE) {
      if(commp->comm.debug&COMM_DEBUG_INFO) birda_log("using 9 wire protocol\n");

      commp->serviceType=COMM_ST_9WIRE;

      buf[0]=9;
      buf[1]=PI_SERVICE_TYPE;
      buf[2]=1;
      buf[3]=COMM_ST_9WIRE;
      buf[4]=PI_FLOW_CONTROL;
      buf[5]=1;
      buf[6]=0;
      buf[7]=commp->isDCE ? PI_DCE : PI_DTE;
      buf[8]=1;
      buf[9]=commp->isDCE ? commp->dce : commp->dte;
      len=10;

      /* Send later: PI_DATA_RATE, PI_DATA_FORMAT
       * Ignore: PI_XON_XOFF, PI_ENQ_ACK
       */
    } else if(st&COMM_ST_3WIRE) {
      birda_log("3 wire protocol is NYI\n");
      /* Send: PI_SERVICE_TYPE, PI_FLOW_CONTROL, PI_XON_XOFF, PI_ENQ_ACK */
    } else if(st&COMM_ST_3WIRE_RAW) {
      birda_log("3 wire raw protocol is NYI\n");
    }

    commp->state=STATE_LIVE;
    commp->con=lapNewConnection(commp->lap,lsap,LM_TINY_TP,buf,len);
    commp->con->handle=commp;
    commp->con->status=connStatus;
    commp->con->data=connData;
    return;
  }

  birda_log("failed to match ports, NYI\n");
}

static void iasStatus(IASClient* ic, int event)
{
  COMMClientPrivate* commp=(COMMClientPrivate*)ic->handle;
  
  switch(event) {
  case IAS_QUERY_COMPLETE:
    switch(commp->state) {
    case STATE_GET_LSAPS:
      checkLsaps(commp);
      if(!iasCltGetValueByClass(commp->ias,"IrDA:IrCOMM","Parameters")) {
	birda_log("fail2\n");
      }
      commp->state=STATE_GET_PARAMETERS;
      break;
    case STATE_GET_PARAMETERS:
      checkParameters(commp);
      iasCltClose(commp->ias);
      commp->ias=0;
      choosePort(commp);
      break;
    }
    break;
  case IAS_QUERY_FAILED:
    birda_log("ias query failed is NYI\n");
    break;
  }
}

/**********************************************************************
 * External functions
 **********************************************************************/

void commCltWrite(COMMClient* comm, const void* buf0, int len)
{
  u_char* buf=(u_char*)buf0;
  COMMClientPrivate* commp=(COMMClientPrivate*)comm;
  int k=connGetSendDataSize(commp->con);
  int n,i=0;
  u_char cbuf[1];

  cbuf[0]=0;

  while((n=len-i)>0) {
    if(commp->serviceType!=COMM_ST_3WIRE_RAW) {
      if(n>=k) n=k-1;
      connWrite2(commp->con,cbuf,1,buf+i,n);
    } else {
      if(n>k) n=k;
      connWrite(commp->con,buf+i,n);
    }
    i+=n;
  }
}

void commCltSetParams(COMMClient* comm, int dataRate, int dataFormat)
{
  COMMClientPrivate* commp=(COMMClientPrivate*)comm;

  if(commp->serviceType!=COMM_ST_3WIRE_RAW) {
    u_char cbuf[10];

    cbuf[0]=9;
    cbuf[1]=PI_DATA_RATE;
    cbuf[2]=4;
    putBELong(cbuf+3,dataRate);
    cbuf[7]=PI_DATA_FORMAT;
    cbuf[8]=1;
    cbuf[9]=dataFormat;

    connWrite(commp->con,cbuf,10);
  }
}

void commCltSetDTE(COMMClient* comm, int dte)
{
  COMMClientPrivate* commp=(COMMClientPrivate*)comm;
  int delta;

  dte&=COMM_DTR|COMM_RTS;
  delta=(commp->dte^dte)>>2;

  if(commp->serviceType!=COMM_ST_3WIRE_RAW && delta) {
    u_char cbuf[4];

    cbuf[0]=3;
    cbuf[1]=PI_DTE;
    cbuf[2]=1;
    cbuf[3]=delta|dte;
    connWrite(commp->con,cbuf,4);

    commp->dte=dte;
  }
}

void commCltSetDCE(COMMClient* comm, int dce)
{
  COMMClientPrivate* commp=(COMMClientPrivate*)comm;
  int delta;

  dce&=COMM_CTS|COMM_DSR|COMM_RI|COMM_CD;
  delta=(commp->dce^dce)>>4;

  if(commp->serviceType!=COMM_ST_3WIRE_RAW && delta) {
    u_char cbuf[4];

    cbuf[0]=3;
    cbuf[1]=PI_DCE;
    cbuf[2]=1;
    cbuf[3]=delta|dce;
    connWrite(commp->con,cbuf,4);

    commp->dce=dce;
  }
}

void commCltClose(COMMClient* comm)
{
  COMMClientPrivate* commp=(COMMClientPrivate*)comm;

  if(commp->ias) iasCltClose(commp->ias);
  if(commp->con) connClose(commp->con);
  freeMem(commp);
}

COMMClient* createCOMMClient(LAP* lap, int serviceMask, int portMask, bool isDCE)
{
  COMMClientPrivate* commp;
  IASClient* ias=createIASClient(lap);
  if(!ias) return 0;

  commp=allocMem(id_client,sizeof(COMMClientPrivate));
  commp->comm.handle=0;
  commp->comm.status=0;
  commp->lap=lap;
  commp->stMask=serviceMask;
  commp->ptMask=portMask;
  commp->state=STATE_GET_LSAPS;
  commp->ias=ias;
  commp->ias->handle=commp;
  commp->ias->status=iasStatus;
  commp->con=0;
  commp->isDCE=isDCE;
  commp->dce=COMM_CTS|COMM_DSR|COMM_RI|COMM_CD;
  commp->dte=COMM_DTR|COMM_RTS;

  iasCltGetValueByClass(commp->ias,"IrDA:IrCOMM","IrDA:TinyTP:LsapSel");

  return &commp->comm;
}