// Copyright 2015 PDFium 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 "testing/embedder_test.h"

#include <limits.h>

#include <list>
#include <string>
#include <utility>
#include <vector>

#include "core/fdrm/crypto/fx_crypt.h"
#include "public/fpdf_dataavail.h"
#include "public/fpdf_edit.h"
#include "public/fpdf_text.h"
#include "public/fpdfview.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/test_support.h"
#include "testing/utils/path_service.h"

#ifdef PDF_ENABLE_V8
#include "v8/include/v8-platform.h"
#include "v8/include/v8.h"
#endif  // PDF_ENABLE_V8

namespace {

const char* g_exe_path = nullptr;

#ifdef PDF_ENABLE_V8
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
v8::StartupData* g_v8_natives = nullptr;
v8::StartupData* g_v8_snapshot = nullptr;
#endif  // V8_USE_EXTERNAL_STARTUP_DATA
#endif  // PDF_ENABLE_V8

FPDF_BOOL Is_Data_Avail(FX_FILEAVAIL* pThis, size_t offset, size_t size) {
  return true;
}

void Add_Segment(FX_DOWNLOADHINTS* pThis, size_t offset, size_t size) {}

std::string CRYPT_ToBase16(const uint8_t* digest) {
  static char const zEncode[] = "0123456789abcdef";
  std::string ret;
  ret.resize(32);
  for (int i = 0, j = 0; i < 16; i++, j += 2) {
    uint8_t a = digest[i];
    ret[j] = zEncode[(a >> 4) & 0xf];
    ret[j + 1] = zEncode[a & 0xf];
  }
  return ret;
}

}  // namespace

EmbedderTest::EmbedderTest()
    : default_delegate_(new EmbedderTest::Delegate()),
      document_(nullptr),
      form_handle_(nullptr),
      avail_(nullptr),
      external_isolate_(nullptr),
      loader_(nullptr),
      file_length_(0),
      file_contents_(nullptr) {
  memset(&hints_, 0, sizeof(hints_));
  memset(&file_access_, 0, sizeof(file_access_));
  memset(&file_avail_, 0, sizeof(file_avail_));
  delegate_ = default_delegate_.get();

#ifdef PDF_ENABLE_V8
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
  if (g_v8_natives && g_v8_snapshot) {
    InitializeV8ForPDFium(g_exe_path, std::string(), nullptr, nullptr,
                          &platform_);
  } else {
    g_v8_natives = new v8::StartupData;
    g_v8_snapshot = new v8::StartupData;
    InitializeV8ForPDFium(g_exe_path, std::string(), g_v8_natives,
                          g_v8_snapshot, &platform_);
  }
#else
  InitializeV8ForPDFium(g_exe_path, &platform_);
#endif  // V8_USE_EXTERNAL_STARTUP_DATA
#endif  // FPDF_ENABLE_V8
}

EmbedderTest::~EmbedderTest() {
#ifdef PDF_ENABLE_V8
  v8::V8::ShutdownPlatform();
  delete platform_;
#endif  // PDF_ENABLE_V8
}

void EmbedderTest::SetUp() {
  FPDF_LIBRARY_CONFIG config;
  config.version = 2;
  config.m_pUserFontPaths = nullptr;
  config.m_v8EmbedderSlot = 0;
  config.m_pIsolate = external_isolate_;
  FPDF_InitLibraryWithConfig(&config);

  UNSUPPORT_INFO* info = static_cast<UNSUPPORT_INFO*>(this);
  memset(info, 0, sizeof(UNSUPPORT_INFO));
  info->version = 1;
  info->FSDK_UnSupport_Handler = UnsupportedHandlerTrampoline;
  FSDK_SetUnSpObjProcessHandler(info);
}

void EmbedderTest::TearDown() {
  if (document_) {
    FORM_DoDocumentAAction(form_handle_, FPDFDOC_AACTION_WC);
    FPDFDOC_ExitFormFillEnvironment(form_handle_);
    FPDF_CloseDocument(document_);
  }

  FPDFAvail_Destroy(avail_);
  FPDF_DestroyLibrary();

  delete loader_;
}

bool EmbedderTest::CreateEmptyDocument() {
  document_ = FPDF_CreateNewDocument();
  if (!document_)
    return false;

  SetupFormFillEnvironment();
  return true;
}

bool EmbedderTest::OpenDocument(const std::string& filename,
                                const char* password,
                                bool must_linearize) {
  std::string file_path;
  if (!PathService::GetTestFilePath(filename, &file_path))
    return false;
  file_contents_ = GetFileContents(file_path.c_str(), &file_length_);
  if (!file_contents_)
    return false;

  EXPECT_TRUE(!loader_);
  loader_ = new TestLoader(file_contents_.get(), file_length_);
  file_access_.m_FileLen = static_cast<unsigned long>(file_length_);
  file_access_.m_GetBlock = TestLoader::GetBlock;
  file_access_.m_Param = loader_;

  file_avail_.version = 1;
  file_avail_.IsDataAvail = Is_Data_Avail;

  hints_.version = 1;
  hints_.AddSegment = Add_Segment;

  avail_ = FPDFAvail_Create(&file_avail_, &file_access_);

  if (FPDFAvail_IsLinearized(avail_) == PDF_LINEARIZED) {
    document_ = FPDFAvail_GetDocument(avail_, password);
    if (!document_) {
      return false;
    }
    int32_t nRet = PDF_DATA_NOTAVAIL;
    while (nRet == PDF_DATA_NOTAVAIL) {
      nRet = FPDFAvail_IsDocAvail(avail_, &hints_);
    }
    if (nRet == PDF_DATA_ERROR) {
      return false;
    }
    nRet = FPDFAvail_IsFormAvail(avail_, &hints_);
    if (nRet == PDF_FORM_ERROR || nRet == PDF_FORM_NOTAVAIL) {
      return false;
    }
    int page_count = FPDF_GetPageCount(document_);
    for (int i = 0; i < page_count; ++i) {
      nRet = PDF_DATA_NOTAVAIL;
      while (nRet == PDF_DATA_NOTAVAIL) {
        nRet = FPDFAvail_IsPageAvail(avail_, i, &hints_);
      }
      if (nRet == PDF_DATA_ERROR) {
        return false;
      }
    }
  } else {
    if (must_linearize) {
      return false;
    }
    document_ = FPDF_LoadCustomDocument(&file_access_, password);
    if (!document_) {
      return false;
    }
  }

#ifdef PDF_ENABLE_XFA
  int docType = DOCTYPE_PDF;
  if (FPDF_HasXFAField(document_, &docType)) {
    if (docType != DOCTYPE_PDF)
      (void)FPDF_LoadXFA(document_);
  }
#endif  // PDF_ENABLE_XFA

  (void)FPDF_GetDocPermissions(document_);
  SetupFormFillEnvironment();
  return true;
}

void EmbedderTest::SetupFormFillEnvironment() {
  IPDF_JSPLATFORM* platform = static_cast<IPDF_JSPLATFORM*>(this);
  memset(platform, 0, sizeof(IPDF_JSPLATFORM));
  platform->version = 2;
  platform->app_alert = AlertTrampoline;

  FPDF_FORMFILLINFO* formfillinfo = static_cast<FPDF_FORMFILLINFO*>(this);
  memset(formfillinfo, 0, sizeof(FPDF_FORMFILLINFO));
#ifdef PDF_ENABLE_XFA
  formfillinfo->version = 2;
#else   // PDF_ENABLE_XFA
  formfillinfo->version = 1;
#endif  // PDF_ENABLE_XFA
  formfillinfo->FFI_SetTimer = SetTimerTrampoline;
  formfillinfo->FFI_KillTimer = KillTimerTrampoline;
  formfillinfo->FFI_GetPage = GetPageTrampoline;
  formfillinfo->m_pJsPlatform = platform;

  form_handle_ = FPDFDOC_InitFormFillEnvironment(document_, formfillinfo);
  FPDF_SetFormFieldHighlightColor(form_handle_, 0, 0xFFE4DD);
  FPDF_SetFormFieldHighlightAlpha(form_handle_, 100);
}

void EmbedderTest::DoOpenActions() {
  FORM_DoDocumentJSAction(form_handle_);
  FORM_DoDocumentOpenAction(form_handle_);
}

int EmbedderTest::GetFirstPageNum() {
  int first_page = FPDFAvail_GetFirstPageNum(document_);
  (void)FPDFAvail_IsPageAvail(avail_, first_page, &hints_);
  return first_page;
}

int EmbedderTest::GetPageCount() {
  int page_count = FPDF_GetPageCount(document_);
  for (int i = 0; i < page_count; ++i) {
    (void)FPDFAvail_IsPageAvail(avail_, i, &hints_);
  }
  return page_count;
}

FPDF_PAGE EmbedderTest::LoadPage(int page_number) {
  // First check whether it is loaded already.
  auto it = page_map_.find(page_number);
  if (it != page_map_.end())
    return it->second;

  FPDF_PAGE page = FPDF_LoadPage(document_, page_number);
  if (!page) {
    return nullptr;
  }
  FORM_OnAfterLoadPage(page, form_handle_);
  FORM_DoPageAAction(page, form_handle_, FPDFPAGE_AACTION_OPEN);
  // Cache the page.
  page_map_[page_number] = page;
  page_reverse_map_[page] = page_number;
  return page;
}

FPDF_BITMAP EmbedderTest::RenderPage(FPDF_PAGE page) {
  int width = static_cast<int>(FPDF_GetPageWidth(page));
  int height = static_cast<int>(FPDF_GetPageHeight(page));
  int alpha = FPDFPage_HasTransparency(page) ? 1 : 0;
  FPDF_BITMAP bitmap = FPDFBitmap_Create(width, height, alpha);
  FPDF_DWORD fill_color = alpha ? 0x00000000 : 0xFFFFFFFF;
  FPDFBitmap_FillRect(bitmap, 0, 0, width, height, fill_color);
  FPDF_RenderPageBitmap(bitmap, page, 0, 0, width, height, 0, 0);
  FPDF_FFLDraw(form_handle_, bitmap, page, 0, 0, width, height, 0, 0);
  return bitmap;
}

void EmbedderTest::UnloadPage(FPDF_PAGE page) {
  FORM_DoPageAAction(page, form_handle_, FPDFPAGE_AACTION_CLOSE);
  FORM_OnBeforeClosePage(page, form_handle_);
  FPDF_ClosePage(page);

  auto it = page_reverse_map_.find(page);
  if (it == page_reverse_map_.end())
    return;

  page_map_.erase(it->second);
  page_reverse_map_.erase(it);
}

FPDF_PAGE EmbedderTest::Delegate::GetPage(FPDF_FORMFILLINFO* info,
                                          FPDF_DOCUMENT document,
                                          int page_index) {
  EmbedderTest* test = static_cast<EmbedderTest*>(info);
  auto it = test->page_map_.find(page_index);
  return it != test->page_map_.end() ? it->second : nullptr;
}

// static
void EmbedderTest::UnsupportedHandlerTrampoline(UNSUPPORT_INFO* info,
                                                int type) {
  EmbedderTest* test = static_cast<EmbedderTest*>(info);
  test->delegate_->UnsupportedHandler(type);
}

// static
int EmbedderTest::AlertTrampoline(IPDF_JSPLATFORM* platform,
                                  FPDF_WIDESTRING message,
                                  FPDF_WIDESTRING title,
                                  int type,
                                  int icon) {
  EmbedderTest* test = static_cast<EmbedderTest*>(platform);
  return test->delegate_->Alert(message, title, type, icon);
}

// static
int EmbedderTest::SetTimerTrampoline(FPDF_FORMFILLINFO* info,
                                     int msecs,
                                     TimerCallback fn) {
  EmbedderTest* test = static_cast<EmbedderTest*>(info);
  return test->delegate_->SetTimer(msecs, fn);
}

// static
void EmbedderTest::KillTimerTrampoline(FPDF_FORMFILLINFO* info, int id) {
  EmbedderTest* test = static_cast<EmbedderTest*>(info);
  return test->delegate_->KillTimer(id);
}

// static
FPDF_PAGE EmbedderTest::GetPageTrampoline(FPDF_FORMFILLINFO* info,
                                          FPDF_DOCUMENT document,
                                          int page_index) {
  return static_cast<EmbedderTest*>(info)->delegate_->GetPage(info, document,
                                                              page_index);
}

// static
void EmbedderTest::CompareBitmap(FPDF_BITMAP bitmap,
                                 int expected_width,
                                 int expected_height,
                                 const char* expected_md5sum) {
  ASSERT_EQ(expected_width, FPDFBitmap_GetWidth(bitmap));
  ASSERT_EQ(expected_height, FPDFBitmap_GetHeight(bitmap));
  const int expected_stride = expected_width * 4;
  ASSERT_EQ(expected_stride, FPDFBitmap_GetStride(bitmap));

  if (!expected_md5sum)
    return;

  uint8_t digest[16];
  CRYPT_MD5Generate(static_cast<uint8_t*>(FPDFBitmap_GetBuffer(bitmap)),
                    expected_stride * expected_height, digest);
  EXPECT_EQ(expected_md5sum, CRYPT_ToBase16(digest));
}

// Can't use gtest-provided main since we need to stash the path to the
// executable in order to find the external V8 binary data files.
int main(int argc, char** argv) {
  g_exe_path = argv[0];
  testing::InitGoogleTest(&argc, argv);
  testing::InitGoogleMock(&argc, argv);
  int ret_val = RUN_ALL_TESTS();

#ifdef PDF_ENABLE_V8
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
  if (g_v8_natives)
    free(const_cast<char*>(g_v8_natives->data));
  if (g_v8_snapshot)
    free(const_cast<char*>(g_v8_snapshot->data));
#endif  // V8_USE_EXTERNAL_STARTUP_DATA
#endif  // PDF_ENABLE_V8

  return ret_val;
}