#include "../../../vm/vm.h"
#include <stdio.h>

#define CODE_SIZE 8192
#define MEMORY_SIZE 65536
u8 lmem[MEMORY_SIZE] = {0};
u8 lcode[CODE_SIZE] = {0};

bool init_vm() {
  mem = lmem;
  code = lcode;
  lc = 0;
  mp = 0;
  cp = 0;
  pc = 0;
  interrupt = 0;
  status = 0;
  return true;
}

u32 syscall(u32 id, u32 size, u32 mem_ptr) {
  USED(size);
  switch(id) {
    case SYSCALL_CONSOLE_WRITE: {
      u32 size = *(u32*)&mem[mem_ptr];
      u8 *ptr = &mem[mem_ptr + 4];
      for (u32 i = 0; i < size; i++) {
        putchar(*(ptr++));
      }
      return 0;
    }
    case SYSCALL_CONSOLE_READ: {
      u8 *ptr = &mem[mp];
      mcpy(ptr, &size, sizeof(u32));
      ptr += 4;
      for (u32 i = 0; i < size; i++) {
        u8 ch = getchar();
        if (ch == '\0')
          break;
        if (ch == '\n')
          break;
        *(ptr++) = ch;
      }
      ptr[size] = '\0';
      mp += 4 + size + 1;
    }
  }

  return 1; // generic error
}

void test_add_two_num() {
  code[cp++] = OP_GET;
  code[cp++] = OP_GET;
  code[cp++] = OP_GET;
  code[cp++] = OP_CALL;
  code[cp++] = OP_INT_TO_STR;
  code[cp++] = OP_SYSCALL;
  code[cp++] = OP_HALT;
  /* add */
  code[cp++] = OP_ADD_INT;
  code[cp++] = OP_RETURN;
}

i32 main() {
  init_vm();

  test_add_two_num();

  while(step_vm()) {
    // do stuff
  }
  return 0;
}