#include "../../../vm/vm.h"
#include "../../../tools/compiler/compiler.h"

#include <SDL2/SDL.h>
#include <stdio.h>

#define MEMORY_SIZE 65536
#define CODE_SIZE 8192
#define STACK_SIZE 1024

u8 lmem[MEMORY_SIZE] = {0};
u8 lcode[CODE_SIZE] = {0};
u32 lstack[STACK_SIZE] = {0};
Frame lframes[STACK_SIZE] = {0};

void reset() {
  pc = 0;
  cp = 0;
  mp = 0;
  fp = 0;
  sp = 0;
  interrupt = 0;
  status = 0;
}

bool init_vm() {
  mem = lmem;
  code = lcode;
  stack = lstack;
  frames = lframes;
  reset();
  return true;
}

void error(const char* msg) {
  printf("%s", msg);
}

bool table_realloc(ScopeTable *table) {
  USED(table);
  // static so do nothing;
  return true;
}

u32 syscall(u32 id, u32 mem_ptr) {
  u32 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
}

i32 main() {
  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
    printf("SDL initialization failed: %s\n", SDL_GetError());
    return 1;
  }
  SDL_SetHint(SDL_HINT_TOUCH_MOUSE_EVENTS, "0");

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