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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);

}