#ifndef _PRCALC_H
#define _PRCALC_H
#include <stdint.h>
#include <math.h>
#include <stdlib.h>

#define STACK_SIZE 1024

#define CARRY 1
#define NEGATIVE 2
#define OVERFLOW 4
#define UNSIGNED 8

typedef enum BOOL {FALSE, TRUE} _PRC_BOOL;

/*
 * A -> general purpose register
 * B -> general purpose register
 * SP -> stack pointer. index where the stack is positioned
 * FLAGS -> 8 bit operation result flags (LSB)
 *  1 -> Carry bit
 *  2 -> Negative
 *  4 -> Overflow
 *  8 -> Unsigned
 *  16 -> 
 *  32 -> 
 *  64 -> 
 *  128 -> 
*/
typedef struct prc_registers {
    uint64_t A;
    uint64_t B;
    uint16_t SP;
    uint8_t FLAGS; 
} __prc_registers;

typedef uint64_t __prc_stack[STACK_SIZE];

typedef struct prc_context {
    __prc_registers registers;
    __prc_stack stack;
} prc_context;

typedef enum PRC_ERROR {OK, STACK_OVERFLOW, STACK_EMPTY, STATE_UNDEFINED} PRC_ERROR;

typedef enum PRC_OPERATION {ADD, SUB, MUL, DIV} __PRC_OPERATION;

PRC_ERROR prc_init_context(prc_context *ctx);
PRC_ERROR prc_push(prc_context *ctx, uint64_t val);
PRC_ERROR prc_pop(prc_context *ctx, uint64_t *val);
PRC_ERROR prc_set_a(prc_context *ctx, uint64_t val);
PRC_ERROR prc_set_b(prc_context *ctx, uint64_t val);
PRC_ERROR prc_swap(prc_context *ctx);
PRC_ERROR prc_add_stack (prc_context *ctx);
PRC_ERROR prc_mul_stack (prc_context *ctx);



#endif //_PRCALC_H