#include <vm/fzl_vm.h>
#include <vm/internals/opcode.h>

int op_cmp_eq(fzl_vm_t *vm)
{
  if (vm->dtop < 2)
  {
    snprintf(last_err, sizeof(last_err),
             "runtime error - expected two values in data stack");
    print_err_data(vm);
    return -1;
  }

  fzl_value_t req = vm->dstack[--vm->dtop];
  fzl_value_t leq = vm->dstack[--vm->dtop];
  vm->dstack[vm->dtop++] =
      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = leq.as.u == req.as.u};
  return 0;
}

int op_cmp_neq(fzl_vm_t *vm)
{
  if (vm->dtop < 2)
  {
    snprintf(last_err, sizeof(last_err),
             "runtime error - expected two values in data stack");
    print_err_data(vm);
    return -1;
  }

  fzl_value_t rneq = vm->dstack[--vm->dtop];
  fzl_value_t lneq = vm->dstack[--vm->dtop];
  vm->dstack[vm->dtop++] =
      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = lneq.as.u != rneq.as.u};
  return 0;
}

int op_cmp_lt(fzl_vm_t *vm)
{
  if (vm->dtop < 2)
  {
    snprintf(last_err, sizeof(last_err),
             "runtime error - expected two values in data stack");
    print_err_data(vm);
    return -1;
  }

  fzl_value_t rlt = vm->dstack[--vm->dtop];
  fzl_value_t llt = vm->dstack[--vm->dtop];
  vm->dstack[vm->dtop++] =
      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = llt.as.u < rlt.as.u};
  return 0;
}

int op_cmp_lteq(fzl_vm_t *vm)
{
  if (vm->dtop < 2)
  {
    snprintf(last_err, sizeof(last_err),
             "runtime error - expected two values in data stack");
    print_err_data(vm);
    return -1;
  }

  fzl_value_t rlteq = vm->dstack[--vm->dtop];
  fzl_value_t llteq = vm->dstack[--vm->dtop];
  vm->dstack[vm->dtop++] =
      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = llteq.as.u <= rlteq.as.u};
  return 0;
}

int op_cmp_gt(fzl_vm_t *vm)
{
  if (vm->dtop < 2)
  {
    snprintf(last_err, sizeof(last_err),
             "runtime error - expected two values in data stack");
    print_err_data(vm);
    return -1;
  }

  fzl_value_t rgt = vm->dstack[--vm->dtop];
  fzl_value_t lgt = vm->dstack[--vm->dtop];
  vm->dstack[vm->dtop++] =
      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = lgt.as.u > rgt.as.u};
  return 0;
}

int op_cmp_gteq(fzl_vm_t *vm)
{
  if (vm->dtop < 2)
  {
    snprintf(last_err, sizeof(last_err),
             "runtime error - expected two values in data stack");
    print_err_data(vm);
    return -1;
  }

  fzl_value_t rgteq = vm->dstack[--vm->dtop];
  fzl_value_t lgteq = vm->dstack[--vm->dtop];
  vm->dstack[vm->dtop++] =
      (fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = lgteq.as.u >= rgteq.as.u};
  return 0;
}