// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ppapi/tests/test_var.h"

#include <string.h>

#include <limits>

#include "ppapi/c/pp_var.h"
#include "ppapi/c/ppb_var.h"
#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/var.h"
#include "ppapi/tests/testing_instance.h"

namespace {

uint32_t kInvalidLength = static_cast<uint32_t>(-1);

}  // namespace

REGISTER_TEST_CASE(Var);

bool TestVar::Init() {
  var_interface_ = static_cast<const PPB_Var*>(
      pp::Module::Get()->GetBrowserInterface(PPB_VAR_INTERFACE));
  return var_interface_ && CheckTestingInterface();
}

void TestVar::RunTests(const std::string& filter) {
  RUN_TEST(BasicString, filter);
  RUN_TEST(InvalidAndEmpty, filter);
  RUN_TEST(InvalidUtf8, filter);
  RUN_TEST(NullInputInUtf8Conversion, filter);
  RUN_TEST(ValidUtf8, filter);
  RUN_TEST(Utf8WithEmbeddedNulls, filter);
  RUN_TEST(VarToUtf8ForWrongType, filter);
}

std::string TestVar::TestBasicString() {
  uint32_t before_object = testing_interface_->GetLiveObjectsForInstance(
      instance_->pp_instance());
  {
    const char kStr[] = "Hello";
    const uint32_t kStrLen(sizeof(kStr) - 1);
    PP_Var str = var_interface_->VarFromUtf8(kStr, kStrLen);
    ASSERT_EQ(PP_VARTYPE_STRING, str.type);

    // Reading back the string should work.
    uint32_t len = 0;
    const char* result = var_interface_->VarToUtf8(str, &len);
    ASSERT_EQ(kStrLen, len);
    ASSERT_EQ(0, strncmp(kStr, result, kStrLen));

    // Destroy the string, readback should now fail.
    var_interface_->Release(str);
    result = var_interface_->VarToUtf8(str, &len);
    ASSERT_EQ(0, len);
    ASSERT_EQ(NULL, result);
  }

  // Make sure we can assign a C++ object to itself and it stays alive.
  {
    pp::Var a("test");
    a = a;
    ASSERT_TRUE(a.AsString() == "test");
  }

  // Make sure nothing leaked.
  ASSERT_TRUE(testing_interface_->GetLiveObjectsForInstance(
      instance_->pp_instance()) == before_object);

  PASS();
}

std::string TestVar::TestInvalidAndEmpty() {
  PP_Var invalid_string;
  invalid_string.type = PP_VARTYPE_STRING;
  invalid_string.value.as_id = 31415926;

  // Invalid strings should give NULL as the return value.
  uint32_t len = std::numeric_limits<uint32_t>::max();
  const char* result = var_interface_->VarToUtf8(invalid_string, &len);
  ASSERT_EQ(0, len);
  ASSERT_EQ(NULL, result);

  // Same with vars that are not strings.
  len = std::numeric_limits<uint32_t>::max();
  pp::Var int_var(42);
  result = var_interface_->VarToUtf8(int_var.pp_var(), &len);
  ASSERT_EQ(0, len);
  ASSERT_EQ(NULL, result);

  // Empty strings should return non-NULL.
  pp::Var empty_string("");
  len = std::numeric_limits<uint32_t>::max();
  result = var_interface_->VarToUtf8(empty_string.pp_var(), &len);
  ASSERT_EQ(0, len);
  ASSERT_NE(NULL, result);

  PASS();
}

std::string TestVar::TestInvalidUtf8() {
  // utf8じゃない (japanese for "is not utf8") in shift-jis encoding.
  static const char kSjisString[] = "utf8\x82\xb6\x82\xe1\x82\xc8\x82\xa2";
  pp::Var sjis(kSjisString);
  if (!sjis.is_null())
    return "Non-UTF8 string was permitted erroneously.";

  PASS();
}

std::string TestVar::TestNullInputInUtf8Conversion() {
  // This test talks directly to the C interface to access edge cases that
  // cannot be exercised via the C++ interface.
  PP_Var converted_string;

  // 0-length string should not dereference input string, and should produce
  // an empty string.
  converted_string = var_interface_->VarFromUtf8(NULL, 0);
  if (converted_string.type != PP_VARTYPE_STRING) {
    return "Expected 0 length to return empty string.";
  }

  // Now convert it back.
  uint32_t length = kInvalidLength;
  const char* result = NULL;
  result = var_interface_->VarToUtf8(converted_string, &length);
  if (length != 0) {
    return "Expected 0 length string on conversion.";
  }
  if (result == NULL) {
    return "Expected a non-null result for 0-lengthed string from VarToUtf8.";
  }
  var_interface_->Release(converted_string);

  // Should not crash, and make an empty string.
  const char* null_string = NULL;
  pp::Var null_var(null_string);
  if (!null_var.is_string() || null_var.AsString() != "") {
    return "Expected NULL input to make an empty string Var.";
  }

  PASS();
}

std::string TestVar::TestValidUtf8() {
  // From UTF8 string -> PP_Var.
  // Chinese for "I am utf8."
  static const char kValidUtf8[] = "\xe6\x88\x91\xe6\x98\xafutf8.";
  pp::Var converted_string(kValidUtf8);

  if (converted_string.is_null())
    return "Unable to convert valid utf8 to var.";

  // Since we're already here, test PP_Var back to UTF8 string.
  std::string returned_string = converted_string.AsString();

  // We need to check against 1 less than sizeof because the resulting string
  // is technically not NULL terminated by API design.
  if (returned_string.size() != sizeof(kValidUtf8) - 1) {
    return "Unable to convert utf8 string back from var.";
  }
  if (returned_string != kValidUtf8) {
    return "String mismatches on conversion back from PP_Var.";
  }

  PASS();
}

std::string TestVar::TestUtf8WithEmbeddedNulls() {
  // From UTF8 string with embedded nulls -> PP_Var.
  // Chinese for "also utf8."
  static const char kUtf8WithEmbededNull[] = "\xe6\xb9\x9f\xe6\x98\xaf\0utf8.";
  std::string orig_string(kUtf8WithEmbededNull,
                          sizeof(kUtf8WithEmbededNull) -1);
  pp::Var converted_string(orig_string);

  if (converted_string.is_null())
    return "Unable to convert utf8 with embedded nulls to var.";

  // Since we're already here, test PP_Var back to UTF8 string.
  std::string returned_string = converted_string.AsString();

  if (returned_string.size() != orig_string.size()) {
    return "Unable to convert utf8 with embedded nulls back from var.";
  }
  if (returned_string != orig_string) {
    return "String mismatches on conversion back from PP_Var.";
  }

  PASS();
}

std::string TestVar::TestVarToUtf8ForWrongType() {
  uint32_t length = kInvalidLength;
  const char* result = NULL;
  result = var_interface_->VarToUtf8(PP_MakeUndefined(), &length);
  if (length != 0) {
    return "Expected 0 on string conversion from Void var.";
  }
  if (result != NULL) {
    return "Expected NULL on string conversion from Void var.";
  }

  length = kInvalidLength;
  result = NULL;
  result = var_interface_->VarToUtf8(PP_MakeNull(), &length);
  if (length != 0) {
    return "Expected 0 on string conversion from Null var.";
  }
  if (result != NULL) {
    return "Expected NULL on string conversion from Null var.";
  }

  length = kInvalidLength;
  result = NULL;
  result = var_interface_->VarToUtf8(PP_MakeBool(PP_TRUE), &length);
  if (length != 0) {
    return "Expected 0 on string conversion from Bool var.";
  }
  if (result != NULL) {
    return "Expected NULL on string conversion from Bool var.";
  }

  length = kInvalidLength;
  result = NULL;
  result = var_interface_->VarToUtf8(PP_MakeInt32(1), &length);
  if (length != 0) {
    return "Expected 0 on string conversion from Int32 var.";
  }
  if (result != NULL) {
    return "Expected NULL on string conversion from Int32 var.";
  }

  length = kInvalidLength;
  result = NULL;
  result = var_interface_->VarToUtf8(PP_MakeDouble(1.0), &length);
  if (length != 0) {
    return "Expected 0 on string conversion from Double var.";
  }
  if (result != NULL) {
    return "Expected NULL on string conversion from Double var.";
  }

  PASS();
}