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#include <stdlib.h>
#include <tracer.h>

void *StartTracerBuffer; // Buffer Start 0
void *EndTracerBuffer; // Buffer End 4
void *LastBeforeEndTracerBuffer; //8
void *CurrentTracerBuffer; //The Actual Write Point For The Next Event 12
void *FirstTracerBuffer; //The First Valid Event 16


int TracerActive = 0; //20
int TracerOutputType = TRACER_NO_OUTPUT; //24
unsigned long long TracerEventsRecorded; //28
unsigned int TracerEventsPresent; //36

extern unsigned int clk_per_msec;

#define TRACER_DEBUG

/* Initialize the tracer
 *
 * Return 0 => Success
 * Return 1 => Fail
 */
int tracer_initialize(int MemorySize)
{

  SYS_FLAGS f;

  f = ll_fsave();

  StartTracerBuffer = malloc(MemorySize);
  if (!StartTracerBuffer) {
    ll_frestore(f);
    return 1;
  }

  EndTracerBuffer = StartTracerBuffer + MemorySize - 1;
  CurrentTracerBuffer = StartTracerBuffer;
  FirstTracerBuffer = StartTracerBuffer;
  LastBeforeEndTracerBuffer = EndTracerBuffer;

  TracerActive = 0;
  TracerEventsRecorded = 0;
  TracerEventsPresent = 0;

  ll_frestore(f);
  return 0;

}

void tracer_enable() {
 
  SYS_FLAGS f;

  f = ll_fsave();

  TracerActive = 1;

  ll_frestore(f);

}

void tracer_disable() {
                                                                                                                             
  SYS_FLAGS f;
                                                                                                                             
  f = ll_fsave();
                                                                                                                             
  TracerActive = 0;
                                                                                                                             
  ll_frestore(f);
                                                                                                                             
}

int send_udp_event(void *p, int size);
void send_remaining_udp_buffer();

/* Send NumberOfEvents out of the system
 * If NumberOfEvents = -1 all the events will be sent */
int tracer_send_logged_events(int NumberOfEvents) {

  void *p;
  int s,err;
 
  SYS_FLAGS f;

  f = ll_fsave();

  if (NumberOfEvents == 0 || TracerEventsPresent == 0) {
    ll_frestore(f);
    return 0;
  }

  p = FirstTracerBuffer;
  s = 0;
  while(((p == CurrentTracerBuffer && s == 0) || p != CurrentTracerBuffer) &&
          s != NumberOfEvents &&
          TracerEventsPresent != 0) {

    switch (TracerOutputType) {
      case TRACER_NO_OUTPUT:
          #ifdef TRACER_DEBUG
            cprintf("Event Type %02x Sent To NULL\n",*(BYTE *)(p));
          #endif
        break;
      case TRACER_UDP_OUTPUT:
          err = send_udp_event(p,*(BYTE *)(p + 9));
          if (err != 0) {
            ll_frestore(f);
            return s;
          }
        break;
      default:
          #ifdef TRACER_DEBUG
            cprintf("Error: Tracer Output Not Defined\n");
          #endif
          ll_frestore(f);
          return -1;
        break;
    }

    p += *(BYTE *)(p + 9);
    if (p >= LastBeforeEndTracerBuffer) p = StartTracerBuffer;

    FirstTracerBuffer = p;
    TracerEventsPresent--;

    s++;

  }

  ll_frestore(f);
  return s;

}

//Flush the events that are ready to send
void tracer_flush_sent_events() {

  switch (TracerOutputType) {
    case TRACER_UDP_OUTPUT:
        send_remaining_udp_buffer();
      break;
  }

}

void tracer_print_statistics() {

  SYS_FLAGS f;
  void *p;
  int i,t,s;
 
  f = ll_fsave();

  cprintf("\nStart Tracer Buffer:           %08x\n",(int)StartTracerBuffer);
  cprintf("End Tracer Buffer:             %08x\n",(int)EndTracerBuffer);
  cprintf("Current Tracer Buffer:         %08x\n",(int)CurrentTracerBuffer);
  cprintf("First Tracer Buffer:           %08x\n",(int)FirstTracerBuffer);
  cprintf("Last Before End Tracer Buffer: %08x\n\n",(int)LastBeforeEndTracerBuffer);

  cprintf("Events Logged:  %d\n",(int)TracerEventsRecorded);
  cprintf("Events Present: %d\n",TracerEventsPresent);

  if (TracerEventsPresent == 0) {
    ll_frestore(f);
    return;
  }

  for (i=0; i<0xFF; i++) {
    p = FirstTracerBuffer;
    t = 0;
    s = 0;
    while((p == CurrentTracerBuffer && s == 0) || p != CurrentTracerBuffer) {
      s++;
      if (*(BYTE *)p == i) t++;
      p += *(BYTE *)(p + 9);
      if (p >= LastBeforeEndTracerBuffer) p = StartTracerBuffer;
    }
    if (t != 0)
      cprintf("Event type %02x => %d\n",i,t);
  }

  ll_frestore(f);

}