/**
 * \file camera.c
 * \brief Defines the state transition table and implements the state transition function
 *
 * \Author Ferdi Franceschini February 2013
 *
 * Copyright: see file Copyright.txt
 */
#include <stdio.h>
#include <string.h>
#include "camera.h"

#define TR(a,b) #a,
#define TE(a,b) #a
char *event_names[] = { "0", CAMERA_CMDS_TABLE, CAMERA_MSGS_TABLE, CAM_MOD_EVENT_TABLE, DRIVER_EVENT_TABLE, CMD_EVENT_TABLE };
#undef TR
#undef TE

/* The signature array defines the identifying characters at the start of a reply. */
#define TR(a,b) b,
#define TE(a,b) b
char *event_signatures[] = { "0", CAMERA_CMDS_TABLE, CAMERA_MSGS_TABLE, CAM_MOD_EVENT_TABLE, DRIVER_EVENT_TABLE, CMD_EVENT_TABLE };
#undef TR
#undef TE

#define TR(a,b) #a,
#define TE(a,b) #a
char *SCL_NAMES[] = {"0", COMMAND_LATCH_STATE_TABLE};
char *SCM_NAMES[] = {"0", CAMERA_MODEL_STATE_TABLE};
char *SDR_NAMES[] = {"0", DRIVER_STATE_TABLE};
#undef TR
#undef TE

#define TR(a,b) b,
#define TE(a,b) b
char *COMMAND_LATCH_STATE_DESCRIPTION[] = {"0", COMMAND_LATCH_STATE_TABLE};
char *CAMERA_MODEL_STATE_DESCRIPTION[]  = {"0", CAMERA_MODEL_STATE_TABLE};
char *DRIVER_STATE_DESCRIPTION[]        = {"0", DRIVER_STATE_TABLE};
#undef TR
#undef TE

char state_str[SSLEN+1];
char event_str[ESLEN+1];
/* Clear event channel */
void EVclr(event_t *E) {
  E->ca=0;
  E->cm=0;
  E->cd=0;
  E->dr=0;
}

/* Set event channel */
void EVset(event_t *E, event_t Ev) {
  if (Ev.ca) E->ca = Ev.ca;
  if (Ev.cm) E->cm = Ev.cm;
  if (Ev.cd) E->cd = Ev.cd;
  if (Ev.dr) E->dr = Ev.dr;
}

/* Set system state */
void STset(state_t *Sc, state_t St) {
  if (St.cl) Sc->cl = St.cl;
  if (St.cm) Sc->cm = St.cm;
  if (St.dr) Sc->dr = St.dr;
}

enum event_codes camera_model(enum event_codes event) {
  switch (event) {
    case ECA_START:
    case ECA_OPEN_SHUTR:
    case ECA_ACQ_IMAGE:
      return ECM_ACQ;

    case ECA_CLOSE_SHUTR:
    case ECA_READ_IMAGE:
    case ECA_SEND_IMAGE:
      return ECM_PROC;

    case ECA_STOP:
      return ECM_STOP;
    case ECA_IDLE:
      return ECM_IDLE;
    case ECA_FAIL:
      return ECM_FAIL;
    default:
      return ECM_UNKNOWN;
  }
}

int cam_parse_status(char *msg, enum event_codes *ca_sym, int *time_rem, int *time_tot) {
  char *delim=" ,";
  char str[100], *tok;
  int ret = 1;

  strcpy(str,msg);
  tok=strtok(str,delim);
  ret = cam_rep2sym(tok);
  if (ret != -1) {
    *ca_sym = ret;
    if (ECA_IDLE == *ca_sym) {
      *time_rem = *time_tot = -1;
    } else {
      tok=strstr(msg, "Remaining");
      sscanf(tok, " Remaining= %d ms, Total Time= %d ms, ", time_rem, time_tot);
    }
  }
  return ret;
}

/* return -1 if message is unknown
 * NOTE: 0 has meaning in the transition table
 */
enum event_codes cam_rep2sym(char *msg) {
  int i;

  for (i = ECA_START; i <= ECA_STOP; i++) {
    if (0 == strcmp(msg, event_signatures[i])) {
      return i;
    }
  }
  return -1;
}

/* return 0 = no transition,
 * return 1 = transition
 */
int cam_trans_fn(state_t Sc, enum event_codes Ein, state_t *Sn, event_t *Eo) {
  trans_t tt;
  int i, ret=0;

  STset(Sn, Sc);
  EVclr(Eo);
  for (i=0; tt=TRANS_TABLE[i], tt.Sc.dr != END_TABLE; i++) {
    if ( Ein == tt.Ei && INSYS(Sc,tt.Sc)) {
      STset(Sn, tt.Sn);
      EVset(Eo, tt.Eo);
      ret = 1;
    }
  }
  return ret;
}

/* TODO Do we need Eo in self, should camsm_t be refactored to remove it? */
void camdriv_input(void *caller, camsm_t *self, enum event_codes event_sym) {
  state_t Sn;
  cam_trans_fn(self->Sc, event_sym, &Sn, &self->Eo);
  self->output_fn(caller, self->Eo);
  self->Sc = Sn;
}

char *strstate(state_t s) {
  char *cl, *cm, *dr;
  cm = SCM_NAMES[s.cm];
  cl = SCL_NAMES[s.cl];
  dr = SDR_NAMES[s.dr];
  snprintf(state_str, SSLEN, "%s,%s,%s", cm, cl, dr);
  return state_str;
}

char *strevent(event_t E) {
  char *ca, *cm, *cd, *dr;
  ca = event_names[E.ca];
  cm = event_names[E.cm];
  cd = event_names[E.cd];
  dr = event_names[E.dr];
  snprintf(event_str, ESLEN, "%s,%s,%s,%s", ca, cm, cd, dr);
  return event_str;
}

/* The transition table has four columns,
 * {current state}, input_event, {output events}, {next state}
 *
 * Each state is actually a 3-tuple (cl,cm,dr) where
 *    cl = command latch state
 *    cm = camera model state
 *    dr = driver state
 *
 * There is only one stream in the input event channel.
 *
 * The output event channel is a 4-tuple (ca,cm,cd,dr) where
 *    ca = camera event stream
 *    cm = cameram model event stream
 *    cd = command event stream
 *    dr = driver event stream
 *  
 * The next state is a 3-tuple as above.
 *
 * 0 = wildcard for components of current state.
 * 0 = no output for the output events.
 * 0 = no change for components of next state.
 */
trans_t TRANS_TABLE[] = {
 {{.cl=SCL_RDY, .dr=SDR_IDLE}, ECD_TK_SHOT, {.dr=0},           {.cl=SCL_TK_SHOT}},
 {{.cl=SCL_RDY, .dr=SDR_IDLE}, ECD_MLTI_ON, {.dr=0},           {.cl=SCL_TK_MLTI}},
 {{.cl=SCL_TK_SHOT},           ECM_IDLE,    {.ca=ECA_TK_SHOT}, {.cl=SCL_WT}},
 {{.cl=SCL_TK_MLTI},           ECD_MLTI_OFF,{.dr=0},           {.cl=SCL_RDY}},
 {{.cl=SCL_TK_MLTI},           ECM_IDLE,    {.ca=ECA_MLTI_ON}, {.cl=SCL_MLTI_ON}},
 {{.cl=SCL_MLTI_ON},           ECD_MLTI_OFF,{.ca=ECA_MLTI_OFF},{.cl=SCL_WT}},
 {{.cl=SCL_WT},                ECM_ACQ,     {.dr=0},           {.cl=SCL_RDY}},
 {{.cl=SCL_WT},                ECM_PROC,    {.dr=0},           {.cl=SCL_RDY}},
 {{.cl=SCL_WT},                ECM_STOP,    {.dr=0},           {.cl=SCL_RDY}},
 {{.cl=SCL_WT},                ECM_IDLE,    {.dr=0},           {.cl=SCL_RDY}},

 {{.cm=SCM_IDLE},              ECM_ACQ,     {.dr=0},           {.cm=SCM_ACQ}},
 {{.cm=SCM_IDLE},              ECM_PROC,    {.dr=0},           {.cm=SCM_PROC}},
 {{.cm=SCM_ACQ},               ECM_PROC,    {.dr=0},           {.cm=SCM_PROC}},
 {{.cm=SCM_ACQ},               ECM_STOP,    {.dr=0},           {.cm=SCM_IDLE}},
 {{.cm=SCM_PROC},              ECM_STOP,    {.dr=0},           {.cm=SCM_IDLE}},
 {{.cm=SCM_ACQ},               ECM_IDLE,    {.dr=0},           {.cm=SCM_IDLE}},
 {{.cm=SCM_PROC},              ECM_IDLE,    {.dr=0},           {.cm=SCM_IDLE}},

 {{.dr=SDR_IDLE},              ECD_TK_SHOT, {.dr=EDR_BUSY},    {.dr=SDR_BUSY}},
 {{.dr=SDR_IDLE},              ECD_MLTI_ON, {.dr=EDR_BUSY},    {.dr=SDR_BUSY}},
 {{.dr=SDR_BUSY, .cl=SCL_RDY}, ECM_PROC,    {.dr=EDR_IDLE},    {.dr=SDR_IDLE}},
 {{.dr=SDR_BUSY, .cl=SCL_RDY}, ECM_STOP,    {.dr=EDR_IDLE},    {.dr=SDR_IDLE}},
 {{.dr=SDR_BUSY, .cl=SCL_RDY}, ECM_IDLE,    {.dr=EDR_IDLE},    {.dr=SDR_IDLE}},
 {{.dr=END_TABLE},             END_TABLE,   {.dr=END_TABLE},   {.dr=END_TABLE}}
};