//
// Created by Nils on 29.10.2023.
//
#ifndef STACK
#define STACK

#include <stdio.h>
#include <stdlib.h>
#include "stackslot.c"

struct stack {
    int* size;
    int* current;
    StackSlot *stack;
};

typedef struct {
    unsigned int size;
    ObjRef *refs;
}ObjRefContainer;

void printStack(struct stack stack, int fp) {
    printf("Stack\nSize:\t\t%i\nCurrent:\t%i\n", *stack.size, *stack.current);
    for (int i = *stack.current -1; i >= 0; --i) {
        printf("%i\t",i);
        if(stack.stack[i].u.objRef == NULL) printf("|NULL|");
        else
        if(stack.stack[i].isObjRef){
          printf("|%p|", (void *)stack.stack[i].u.objRef);
          if(stack.stack[i].u.objRef->size == sizeof(int))
            printf("(%i)",*(int *)stack.stack[i].u.objRef->data);
        }else {
        printf("|%i|", getIntValfromStackSlot(stack.stack[i]));
      }
      if(fp == i) printf("<-\tFP\n");
      else if(*stack.current == i) printf("<-\tSP\n");
      else printf("\n");
    }
}

//ObjRefContainer getRefs(struct stack stack){
//  ObjRefContainer continer;
//  int counter = 0;
//  for (int i = 0; i <= *stack.current; i++) {
//    if(stack.stack[i].isObjRef == true) counter++;
//  }
//  continer.size = counter;
//  ObjRef *list = (ObjRef *)malloc(counter * sizeof(ObjRef));
//  for (int i = 0; i<= *stack.current; i++)
//    if(stack.stack[i].isObjRef == true)
//      list[counter--] = stack.stack[i].u.objRef;
//  continer.refs = list;
//  return continer;
//}

void push(struct stack s, StackSlot value) {
    if (*s.current >= *s.size) {
        printf("Stack Overflow\n");
        exit(EXIT_FAILURE);
    }
    s.stack[*s.current] = value;
    *s.current=*s.current + 1;
}

StackSlot pop(struct stack s) {
    if (*s.current == 0) {
        printf("Stack Underflow\n");
        exit(EXIT_FAILURE);
    }
    *s.current = *s.current -1;
    return s.stack[*s.current];
}

int peek(struct stack s, int steps) {
    if (*s.current - steps < 0) {
        printf("Stack Underflow\n");
        exit(EXIT_FAILURE);
    }
    return getIntValfromStackSlot(s.stack[*s.current - steps]);
}
#endif