#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>

//---------------------------------------------------------------------------------------
//                  USER event description
//---------------------------------------------------------------------------------------


//---------------------------------------------------------------------------------------
//                  BUFFER description
//---------------------------------------------------------------------------------------
class LogBuffer {

public:

  int MAXEVT;
  char *log_buf;   //--  event buffer 
  int wr_p, rd_p, loop_flag, fill_level;
  
  LogBuffer(LogBuffer *buf, int size) {  printf("Logbuffer:: Constructor, size=%d\n",size); sleep(1);
    MAXEVT=size; wr_p=buf->wr_ptr; rd_p=buf->rd_ptr; loop_flag=buf->loop_ptr; fill_level=buf->level_ptr;
    //log_buf = new char [size];    
    log_buf = buf->buf;
  }
  
  ~LogBuffer() {   printf("Logbuffer:: Destructor\n"); 
    //delete log_buf; 
  }
  
  int write(char *text, int size) { 
    //if (wr_p==rd_p && loop_flag>0) { fill_level=MAXEVT*loop_flag+wr_p-rd_p; return 1; }
    printf("LogBuffer:write()::  1:: size=%d wr=%d\n",size,wr_p);
    for (int bc=0; bc<size; bc++) {
      log_buf[wr_p]=text[bc];  wr_p=(wr_p+1)%MAXEVT;
      if (wr_p==0) loop_flag++;
    }
    return 0;
  }
  
  int read(char *text, int size) { 
    //if (rd_p==wr_p && loop_flag==0) { fill_level=MAXEVT*loop_flag+wr_p-rd_p; return 1; }
    printf("LogBuffer:read()::  1:: size=%d wr=%d \n",size,wr_p);
    if (size>MAXEVT) size=MAXEVT;
    if (size<=wr_p) { rd_p=wr_p-size;  loop_flag=0;}
    else { rd_p=MAXEVT-(size-wr_p); loop_flag=1; }
    int ic=0;
    printf("LogBuffer:read()::  2:: size=%d  rd=%d  wr=%d \n",size,rd_p,wr_p );
    for (int bc=0; bc<size; bc++) {
      text[ic]=log_buf[rd_p];  rd_p=(rd_p+1)%MAXEVT;
      if (text[ic]>0) ic++;
      if (rd_p==0) loop_flag--;
    }
    return ic;
  }

  int level() { 
    return MAXEVT*loop_flag+wr_p-rd_p;
  }
  
};

//---------------------------------------------------------------------------------------