#include <mruby.h>
#include <mruby/class.h>
#include <mruby/string.h>
#include <mruby/istruct.h>

static mrb_value
istruct_test_initialize(mrb_state *mrb, mrb_value self)
{
  char *string = (char*)mrb_istruct_ptr(self);
  mrb_int size = mrb_istruct_size();
  mrb_value object = mrb_get_arg1(mrb);

  if (mrb_integer_p(object)) {
    strncpy(string, "fixnum", size-1);
  }
#ifndef MRB_NO_FLOAT
  else if (mrb_float_p(object)) {
    strncpy(string, "float", size-1);
  }
#endif
  else if (mrb_string_p(object)) {
    strncpy(string, "string", size-1);
  }
  else {
    strncpy(string, "anything", size-1);
  }

  string[size - 1] = 0; // force NULL at the end
  return self;
}

static mrb_value
istruct_test_to_s(mrb_state *mrb, mrb_value self)
{
  return mrb_str_new_cstr(mrb, (const char*)mrb_istruct_ptr(self));
}

static mrb_value
istruct_test_length(mrb_state *mrb, mrb_value self)
{
  return mrb_fixnum_value(mrb_istruct_size());
}

static mrb_value
istruct_test_test_receive(mrb_state *mrb, mrb_value self)
{
  mrb_value object = mrb_get_arg1(mrb);

  if (mrb_obj_class(mrb, object) != mrb_class_get(mrb, "InlineStructTest"))
  {
    mrb_raise(mrb, E_TYPE_ERROR, "Expected InlineStructTest");
  }
  return mrb_bool_value(((char*)mrb_istruct_ptr(object))[0] == 's');
}

static mrb_value
istruct_test_test_receive_direct(mrb_state *mrb, mrb_value self)
{
  mrb_value is = mrb_get_arg1(mrb);
  struct RClass *klass = mrb_class_get(mrb, "InlineStructTest");
  /* if you need to protect istruct retrieval from untrusted code,
     you need to care about class replacing.
     See mrbgem/mruby-random/src/random.c for detail */
  if (mrb_istruct_p(is) && mrb_obj_is_kind_of(mrb, is, klass)) {
    char *ptr = (char*)mrb_istruct_ptr(is);
    return mrb_bool_value(ptr[0] == 's');
  }
  mrb_raise(mrb, E_TYPE_ERROR, "InlineStructTest");
  return mrb_false_value();
}

static mrb_value
istruct_test_mutate(mrb_state *mrb, mrb_value self)
{
  char *ptr = (char*)mrb_istruct_ptr(self);
  memcpy(ptr, "mutate", 6);
  return mrb_nil_value();
}

void mrb_mruby_test_inline_struct_gem_test(mrb_state *mrb)
{
  struct RClass *cls;

  cls = mrb_define_class(mrb, "InlineStructTest", mrb->object_class);
  MRB_SET_INSTANCE_TT(cls, MRB_TT_ISTRUCT);
  mrb_define_method(mrb, cls, "initialize", istruct_test_initialize, MRB_ARGS_REQ(1));
  mrb_define_method(mrb, cls, "to_s", istruct_test_to_s, MRB_ARGS_NONE());
  mrb_define_method(mrb, cls, "mutate", istruct_test_mutate, MRB_ARGS_NONE());
  mrb_define_class_method(mrb, cls, "length", istruct_test_length, MRB_ARGS_NONE());
  mrb_define_class_method(mrb, cls, "test_receive", istruct_test_test_receive, MRB_ARGS_REQ(1));
  mrb_define_class_method(mrb, cls, "test_receive_direct", istruct_test_test_receive_direct, MRB_ARGS_REQ(1));
}