#include <stdio.h>
#include <hls_stream.h>
#include <ap_axi_sdata.h>
#include<math.h>
#include <string.h>

using namespace std;

typedef ap_axis<32,0,0,0> pkt_t;
static int count_streams = 0;
static long long charIn=0;
static long long final_char=0;
int addNum=0;
static int decNum = 0;
static int decimalCounter = 0;
static int decimalOut = 0;
int lastDecimalVal;

long long convert(int n);
int convertBinInt(long long n);
void decrypt(int data);
void toAscii(char *c);
int getDecimal(int n);


void pixel(ap_int<32> &in_decimal,
        ap_int<32> selector,
		ap_int<32> position1,
		ap_int<32> position2,
		hls::stream< pkt_t > &din,
		hls::stream< pkt_t > &dout
) {
	#pragma HLS INTERFACE ap_ctrl_none port=return
    #pragma HLS INTERFACE s_axilite port=in_decimal
    #pragma HLS INTERFACE s_axilite port=selector
	#pragma HLS INTERFACE s_axilite port=position1
	#pragma HLS INTERFACE s_axilite port=position2
	#pragma HLS INTERFACE axis port=din
	#pragma HLS INTERFACE axis port=dout

    pkt_t pkt=din.read();
    // toAscii(key);
    switch(selector)
    {
        case 0:
            
            if (count_streams == 0){
                final_char=0;
                decNum = in_decimal;
            }
            //123456321
            if((count_streams >= (position1 - 1)) && (count_streams < position2)){
                // addNum=0;
                addNum=0;
                if(decimalCounter % 8 == 0){
                    lastDecimalVal = getDecimal(decNum);
                    decNum /= 100;
                    charIn=convert(lastDecimalVal);
                    
                }
                addNum=charIn%10;
		        charIn=(int)charIn/10;

                
                // if(decNum !=0 ){
                //     pkt.data += getDecimal(decNum);
		        //     decNum = decNum/1000;
                // }

                if(pkt.data % 2 == 0 && addNum == 1){
                    pkt.data += 1;
                    
                }else if(pkt.data % 2 != 0 && addNum == 0){
                    pkt.data -= 1;
                    
                }
                decimalCounter++;

            }

            break;

        case 1:
            if((count_streams >= (position1 - 1)) && (count_streams < position2)){
                
                
                decrypt(pkt.data);
                decimalCounter++;
                if(decimalCounter == 8){
                    decimalOut=decimalOut*100+convertBinInt(final_char);  
                    decimalCounter=0;
                    final_char=0;   
                }
            
                
            }
            break;

        default:
            break;
    }
	
	count_streams++;

	if (count_streams == position2-1){
		count_streams = 0;
        charIn=0;
        addNum=0;
        decimalCounter=0;
        if(selector == 1){
            final_char=0;
            in_decimal=decimalOut;
            decimalOut=0;
        }

	}

    dout.write(pkt);
}


long long convert(int n) {
    long long bin = 0;
    int rem, i = 1, step = 1;
    while (n != 0) {
        rem = n % 2;
        n /= 2;
        bin += rem * i;
        i *= 10;
    }
    return bin;
}

void decrypt(int data) {
int bit;
if(data % 2 == 0){
   bit = 0;
}else if(data % 2 != 0){
    bit=1;
}
final_char= final_char*10+bit;

}

int convertBinInt(long long n) {
int dec = 0, i = 7, b=0,rem=0;
    while (n != 0) {
        b=pow(10,i);
        rem = n / b;
        n =n % b;
        dec += rem * pow(2, 7-i);
        --i;
    }
    return dec;
}

int getDecimal(int n) {
    int num = 0;
    num = n % 100;
    return num;
    }