// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "fxjs/cjs_app.h"

#include <stdint.h>

#include <algorithm>
#include <utility>

#include "core/fxcrt/fixed_zeroed_data_vector.h"
#include "core/fxcrt/stl_util.h"
#include "fpdfsdk/cpdfsdk_formfillenvironment.h"
#include "fpdfsdk/cpdfsdk_interactiveform.h"
#include "fxjs/cjs_document.h"
#include "fxjs/cjs_timerobj.h"
#include "fxjs/global_timer.h"
#include "fxjs/ijs_event_context.h"
#include "fxjs/js_resources.h"
#include "third_party/base/containers/span.h"
#include "v8/include/v8-container.h"

namespace {

constexpr wchar_t kStrViewerType[] = L"pdfium";
constexpr wchar_t kStrViewerVariation[] = L"Full";
constexpr wchar_t kStrPlatform[] = L"WIN";
constexpr wchar_t kStrLanguage[] = L"ENU";
constexpr int kNumViewerVersion = 8;
constexpr int kNumViewerVersionXfa = 11;
constexpr int kNumFormsVersion = 7;

}  // namespace

const JSPropertySpec CJS_App::PropertySpecs[] = {
    {"activeDocs", get_active_docs_static, set_active_docs_static},
    {"calculate", get_calculate_static, set_calculate_static},
    {"formsVersion", get_forms_version_static, set_forms_version_static},
    {"fs", get_fs_static, set_fs_static},
    {"fullscreen", get_fullscreen_static, set_fullscreen_static},
    {"language", get_language_static, set_language_static},
    {"media", get_media_static, set_media_static},
    {"platform", get_platform_static, set_platform_static},
    {"runtimeHighlight", get_runtime_highlight_static,
     set_runtime_highlight_static},
    {"viewerType", get_viewer_type_static, set_viewer_type_static},
    {"viewerVariation", get_viewer_variation_static,
     set_viewer_variation_static},
    {"viewerVersion", get_viewer_version_static, set_viewer_version_static}};

const JSMethodSpec CJS_App::MethodSpecs[] = {
    {"alert", alert_static},
    {"beep", beep_static},
    {"browseForDoc", browseForDoc_static},
    {"clearInterval", clearInterval_static},
    {"clearTimeOut", clearTimeOut_static},
    {"execDialog", execDialog_static},
    {"execMenuItem", execMenuItem_static},
    {"findComponent", findComponent_static},
    {"goBack", goBack_static},
    {"goForward", goForward_static},
    {"launchURL", launchURL_static},
    {"mailMsg", mailMsg_static},
    {"newFDF", newFDF_static},
    {"newDoc", newDoc_static},
    {"openDoc", openDoc_static},
    {"openFDF", openFDF_static},
    {"popUpMenuEx", popUpMenuEx_static},
    {"popUpMenu", popUpMenu_static},
    {"response", response_static},
    {"setInterval", setInterval_static},
    {"setTimeOut", setTimeOut_static}};

uint32_t CJS_App::ObjDefnID = 0;

const char CJS_App::kName[] = "app";

// static
uint32_t CJS_App::GetObjDefnID() {
  return ObjDefnID;
}

// static
void CJS_App::DefineJSObjects(CFXJS_Engine* pEngine) {
  ObjDefnID = pEngine->DefineObj(CJS_App::kName, FXJSOBJTYPE_STATIC,
                                 JSConstructor<CJS_App>, JSDestructor);
  DefineProps(pEngine, ObjDefnID, PropertySpecs);
  DefineMethods(pEngine, ObjDefnID, MethodSpecs);
}

CJS_App::CJS_App(v8::Local<v8::Object> pObject, CJS_Runtime* pRuntime)
    : CJS_Object(pObject, pRuntime) {}

CJS_App::~CJS_App() = default;

CJS_Result CJS_App::get_active_docs(CJS_Runtime* pRuntime) {
  v8::Local<v8::Object> pObj = pRuntime->GetThisObj();
  auto pJSDocument = JSGetObject<CJS_Document>(pRuntime->GetIsolate(), pObj);
  if (!pJSDocument)
    return CJS_Result::Failure(JSMessage::kObjectTypeError);
  v8::Local<v8::Array> aDocs = pRuntime->NewArray();
  pRuntime->PutArrayElement(aDocs, 0, pJSDocument->ToV8Object());
  if (pRuntime->GetArrayLength(aDocs) > 0)
    return CJS_Result::Success(aDocs);

  return CJS_Result::Success(pRuntime->NewUndefined());
}

CJS_Result CJS_App::set_active_docs(CJS_Runtime* pRuntime,
                                    v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_calculate(CJS_Runtime* pRuntime) {
  return CJS_Result::Success(pRuntime->NewBoolean(m_bCalculate));
}

CJS_Result CJS_App::set_calculate(CJS_Runtime* pRuntime,
                                  v8::Local<v8::Value> vp) {
  m_bCalculate = pRuntime->ToBoolean(vp);
  pRuntime->GetFormFillEnv()->GetInteractiveForm()->EnableCalculate(
      m_bCalculate);
  return CJS_Result::Success();
}

CJS_Result CJS_App::get_forms_version(CJS_Runtime* pRuntime) {
  return CJS_Result::Success(pRuntime->NewNumber(kNumFormsVersion));
}

CJS_Result CJS_App::set_forms_version(CJS_Runtime* pRuntime,
                                      v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_viewer_type(CJS_Runtime* pRuntime) {
  return CJS_Result::Success(pRuntime->NewString(kStrViewerType));
}

CJS_Result CJS_App::set_viewer_type(CJS_Runtime* pRuntime,
                                    v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_viewer_variation(CJS_Runtime* pRuntime) {
  return CJS_Result::Success(pRuntime->NewString(kStrViewerVariation));
}

CJS_Result CJS_App::set_viewer_variation(CJS_Runtime* pRuntime,
                                         v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_viewer_version(CJS_Runtime* pRuntime) {
  CPDF_Document::Extension* pContext =
      pRuntime->GetFormFillEnv()->GetDocExtension();
  int version = pContext && pContext->ContainsExtensionForm()
                    ? kNumViewerVersionXfa
                    : kNumViewerVersion;
  return CJS_Result::Success(pRuntime->NewNumber(version));
}

CJS_Result CJS_App::set_viewer_version(CJS_Runtime* pRuntime,
                                       v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_platform(CJS_Runtime* pRuntime) {
  CPDFSDK_FormFillEnvironment* pFormFillEnv = pRuntime->GetFormFillEnv();
  if (pFormFillEnv) {
    WideString platform = pFormFillEnv->GetPlatform();
    if (!platform.IsEmpty())
      return CJS_Result::Success(pRuntime->NewString(platform.AsStringView()));
  }
  return CJS_Result::Success(pRuntime->NewString(kStrPlatform));
}

CJS_Result CJS_App::set_platform(CJS_Runtime* pRuntime,
                                 v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_language(CJS_Runtime* pRuntime) {
  CPDFSDK_FormFillEnvironment* pFormFillEnv = pRuntime->GetFormFillEnv();
  if (pFormFillEnv) {
    WideString language = pFormFillEnv->GetLanguage();
    if (!language.IsEmpty())
      return CJS_Result::Success(pRuntime->NewString(language.AsStringView()));
  }
  return CJS_Result::Success(pRuntime->NewString(kStrLanguage));
}

CJS_Result CJS_App::set_language(CJS_Runtime* pRuntime,
                                 v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

// creates a new fdf object that contains no data
// comment: need reader support
// note:
// CFDF_Document * CPDFSDK_FormFillEnvironment::NewFDF();
CJS_Result CJS_App::newFDF(CJS_Runtime* pRuntime,
                           pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Success();
}

// opens a specified pdf document and returns its document object
// comment:need reader support
// note: as defined in js reference, the proto of this function's fourth
// parmeters, how old an fdf document while do not show it.
// CFDF_Document * CPDFSDK_FormFillEnvironment::OpenFDF(string strPath,bool
// bUserConv);

CJS_Result CJS_App::openFDF(CJS_Runtime* pRuntime,
                            pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Success();
}

CJS_Result CJS_App::alert(CJS_Runtime* pRuntime,
                          pdfium::span<v8::Local<v8::Value>> params) {
  v8::LocalVector<v8::Value> newParams = ExpandKeywordParams(
      pRuntime, params, 4, "cMsg", "nIcon", "nType", "cTitle");

  if (!IsExpandedParamKnown(newParams[0]))
    return CJS_Result::Failure(JSMessage::kParamError);

  CPDFSDK_FormFillEnvironment* pFormFillEnv = pRuntime->GetFormFillEnv();
  if (!pFormFillEnv)
    return CJS_Result::Success(pRuntime->NewNumber(0));

  WideString swMsg;
  if (newParams[0]->IsArray()) {
    v8::Local<v8::Array> carray = pRuntime->ToArray(newParams[0]);
    swMsg = L"[";
    for (size_t i = 0; i < pRuntime->GetArrayLength(carray); ++i) {
      if (i)
        swMsg += L", ";

      swMsg += pRuntime->ToWideString(pRuntime->GetArrayElement(carray, i));
    }
    swMsg += L"]";
  } else {
    swMsg = pRuntime->ToWideString(newParams[0]);
  }

  int iIcon = JSPLATFORM_ALERT_ICON_DEFAULT;
  if (IsExpandedParamKnown(newParams[1]))
    iIcon = pRuntime->ToInt32(newParams[1]);

  int iType = JSPLATFORM_ALERT_BUTTON_DEFAULT;
  if (IsExpandedParamKnown(newParams[2]))
    iType = pRuntime->ToInt32(newParams[2]);

  WideString swTitle;
  if (IsExpandedParamKnown(newParams[3]))
    swTitle = pRuntime->ToWideString(newParams[3]);
  else
    swTitle = JSGetStringFromID(JSMessage::kAlert);

  pRuntime->BeginBlock();
  pFormFillEnv->KillFocusAnnot({});
  v8::Local<v8::Value> ret = pRuntime->NewNumber(
      pFormFillEnv->JS_appAlert(swMsg, swTitle, iType, iIcon));
  pRuntime->EndBlock();

  return CJS_Result::Success(ret);
}

CJS_Result CJS_App::beep(CJS_Runtime* pRuntime,
                         pdfium::span<v8::Local<v8::Value>> params) {
  if (params.size() != 1)
    return CJS_Result::Failure(JSMessage::kParamError);

  int type = JSPLATFORM_BEEP_DEFAULT;
  if (IsExpandedParamKnown(params[0]))
    type = pRuntime->ToInt32(params[0]);

  pRuntime->GetFormFillEnv()->JS_appBeep(type);
  return CJS_Result::Success();
}

CJS_Result CJS_App::findComponent(CJS_Runtime* pRuntime,
                                  pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Success();
}

CJS_Result CJS_App::popUpMenuEx(CJS_Runtime* pRuntime,
                                pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::get_fs(CJS_Runtime* pRuntime) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::set_fs(CJS_Runtime* pRuntime, v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::setInterval(CJS_Runtime* pRuntime,
                                pdfium::span<v8::Local<v8::Value>> params) {
  if (params.size() == 0 || params.size() > 2)
    return CJS_Result::Failure(JSMessage::kParamError);

  WideString script = pRuntime->ToWideString(params[0]);
  if (script.IsEmpty())
    return CJS_Result::Failure(JSMessage::kInvalidInputError);

  uint32_t dwInterval = params.size() > 1 ? pRuntime->ToInt32(params[1]) : 1000;
  auto timerRef = std::make_unique<GlobalTimer>(
      this, pRuntime, GlobalTimer::Type::kRepeating, script, dwInterval, 0);
  GlobalTimer* pTimerRef = timerRef.get();
  m_Timers.insert(std::move(timerRef));

  v8::Local<v8::Object> pRetObj = pRuntime->NewFXJSBoundObject(
      CJS_TimerObj::GetObjDefnID(), FXJSOBJTYPE_DYNAMIC);
  if (pRetObj.IsEmpty())
    return CJS_Result::Failure(JSMessage::kBadObjectError);

  auto* pJS_TimerObj = static_cast<CJS_TimerObj*>(
      CFXJS_Engine::GetObjectPrivate(pRuntime->GetIsolate(), pRetObj));

  pJS_TimerObj->SetTimer(pTimerRef);
  return CJS_Result::Success(pRetObj);
}

CJS_Result CJS_App::setTimeOut(CJS_Runtime* pRuntime,
                               pdfium::span<v8::Local<v8::Value>> params) {
  if (params.size() == 0 || params.size() > 2)
    return CJS_Result::Failure(JSMessage::kParamError);

  WideString script = pRuntime->ToWideString(params[0]);
  if (script.IsEmpty())
    return CJS_Result::Failure(JSMessage::kInvalidInputError);

  uint32_t dwTimeOut = params.size() > 1 ? pRuntime->ToInt32(params[1]) : 1000;
  auto timerRef =
      std::make_unique<GlobalTimer>(this, pRuntime, GlobalTimer::Type::kOneShot,
                                    script, dwTimeOut, dwTimeOut);
  GlobalTimer* pTimerRef = timerRef.get();
  m_Timers.insert(std::move(timerRef));

  v8::Local<v8::Object> pRetObj = pRuntime->NewFXJSBoundObject(
      CJS_TimerObj::GetObjDefnID(), FXJSOBJTYPE_DYNAMIC);
  if (pRetObj.IsEmpty())
    return CJS_Result::Failure(JSMessage::kBadObjectError);

  auto* pJS_TimerObj = static_cast<CJS_TimerObj*>(
      CFXJS_Engine::GetObjectPrivate(pRuntime->GetIsolate(), pRetObj));

  pJS_TimerObj->SetTimer(pTimerRef);
  return CJS_Result::Success(pRetObj);
}

CJS_Result CJS_App::clearTimeOut(CJS_Runtime* pRuntime,
                                 pdfium::span<v8::Local<v8::Value>> params) {
  if (params.size() != 1)
    return CJS_Result::Failure(JSMessage::kParamError);

  CJS_App::ClearTimerCommon(pRuntime, params[0]);
  return CJS_Result::Success();
}

CJS_Result CJS_App::clearInterval(CJS_Runtime* pRuntime,
                                  pdfium::span<v8::Local<v8::Value>> params) {
  if (params.size() != 1)
    return CJS_Result::Failure(JSMessage::kParamError);

  CJS_App::ClearTimerCommon(pRuntime, params[0]);
  return CJS_Result::Success();
}

void CJS_App::ClearTimerCommon(CJS_Runtime* pRuntime,
                               v8::Local<v8::Value> param) {
  if (!param->IsObject())
    return;

  v8::Local<v8::Object> pObj = pRuntime->ToObject(param);
  auto pTimer = JSGetObject<CJS_TimerObj>(pRuntime->GetIsolate(), pObj);
  if (!pTimer)
    return;

  GlobalTimer::Cancel(pTimer->GetTimerID());
}

CJS_Result CJS_App::execMenuItem(CJS_Runtime* pRuntime,
                                 pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

void CJS_App::TimerProc(GlobalTimer* pTimer) {
  CJS_Runtime* pRuntime = pTimer->GetRuntime();
  if (pRuntime && (!pTimer->IsOneShot() || pTimer->GetTimeOut() > 0))
    RunJsScript(pRuntime, pTimer->GetJScript());
}

void CJS_App::CancelProc(GlobalTimer* pTimer) {
  m_Timers.erase(fxcrt::MakeFakeUniquePtr(pTimer));
}

void CJS_App::RunJsScript(CJS_Runtime* pRuntime, const WideString& wsScript) {
  if (pRuntime->IsBlocking())
    return;

  IJS_Runtime::ScopedEventContext pContext(pRuntime);
  pContext->OnExternal_Exec();
  pContext->RunScript(wsScript);
}

CJS_Result CJS_App::goBack(CJS_Runtime* pRuntime,
                           pdfium::span<v8::Local<v8::Value>> params) {
  // Not supported, but do not return error.
  return CJS_Result::Success();
}

CJS_Result CJS_App::goForward(CJS_Runtime* pRuntime,
                              pdfium::span<v8::Local<v8::Value>> params) {
  // Not supported, but do not return error.
  return CJS_Result::Success();
}

CJS_Result CJS_App::mailMsg(CJS_Runtime* pRuntime,
                            pdfium::span<v8::Local<v8::Value>> params) {
  v8::LocalVector<v8::Value> newParams = ExpandKeywordParams(
      pRuntime, params, 6, "bUI", "cTo", "cCc", "cBcc", "cSubject", "cMsg");

  if (!IsExpandedParamKnown(newParams[0]))
    return CJS_Result::Failure(JSMessage::kParamError);

  bool bUI = pRuntime->ToBoolean(newParams[0]);
  WideString cTo;
  if (IsExpandedParamKnown(newParams[1])) {
    cTo = pRuntime->ToWideString(newParams[1]);
  } else {
    // cTo parameter required when UI not invoked.
    if (!bUI)
      return CJS_Result::Failure(JSMessage::kParamError);
  }

  WideString cCc;
  if (IsExpandedParamKnown(newParams[2]))
    cCc = pRuntime->ToWideString(newParams[2]);

  WideString cBcc;
  if (IsExpandedParamKnown(newParams[3]))
    cBcc = pRuntime->ToWideString(newParams[3]);

  WideString cSubject;
  if (IsExpandedParamKnown(newParams[4]))
    cSubject = pRuntime->ToWideString(newParams[4]);

  WideString cMsg;
  if (IsExpandedParamKnown(newParams[5]))
    cMsg = pRuntime->ToWideString(newParams[5]);

  pRuntime->BeginBlock();
  pRuntime->GetFormFillEnv()->JS_docmailForm(pdfium::span<const uint8_t>(), bUI,
                                             cTo, cSubject, cCc, cBcc, cMsg);
  pRuntime->EndBlock();
  return CJS_Result::Success();
}

CJS_Result CJS_App::launchURL(CJS_Runtime* pRuntime,
                              pdfium::span<v8::Local<v8::Value>> params) {
  // Unsafe, not supported, but do not return error.
  return CJS_Result::Success();
}

CJS_Result CJS_App::get_runtime_highlight(CJS_Runtime* pRuntime) {
  return CJS_Result::Success(pRuntime->NewBoolean(m_bRuntimeHighLight));
}

CJS_Result CJS_App::set_runtime_highlight(CJS_Runtime* pRuntime,
                                          v8::Local<v8::Value> vp) {
  m_bRuntimeHighLight = pRuntime->ToBoolean(vp);
  return CJS_Result::Success();
}

CJS_Result CJS_App::get_fullscreen(CJS_Runtime* pRuntime) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::set_fullscreen(CJS_Runtime* pRuntime,
                                   v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::popUpMenu(CJS_Runtime* pRuntime,
                              pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::browseForDoc(CJS_Runtime* pRuntime,
                                 pdfium::span<v8::Local<v8::Value>> params) {
  // Unsafe, not supported, but do not return an error.
  return CJS_Result::Success();
}

WideString CJS_App::SysPathToPDFPath(const WideString& sOldPath) {
  WideString sRet = L"/";
  for (const wchar_t& c : sOldPath) {
    if (c != L':')
      sRet += (c == L'\\') ? L'/' : c;
  }
  return sRet;
}

CJS_Result CJS_App::newDoc(CJS_Runtime* pRuntime,
                           pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::openDoc(CJS_Runtime* pRuntime,
                            pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::response(CJS_Runtime* pRuntime,
                             pdfium::span<v8::Local<v8::Value>> params) {
  v8::LocalVector<v8::Value> newParams =
      ExpandKeywordParams(pRuntime, params, 5, "cQuestion", "cTitle",
                          "cDefault", "bPassword", "cLabel");

  if (!IsExpandedParamKnown(newParams[0]))
    return CJS_Result::Failure(JSMessage::kParamError);

  WideString swQuestion = pRuntime->ToWideString(newParams[0]);
  WideString swTitle = L"PDF";
  if (IsExpandedParamKnown(newParams[1]))
    swTitle = pRuntime->ToWideString(newParams[1]);

  WideString swDefault;
  if (IsExpandedParamKnown(newParams[2]))
    swDefault = pRuntime->ToWideString(newParams[2]);

  bool bPassword = false;
  if (IsExpandedParamKnown(newParams[3]))
    bPassword = pRuntime->ToBoolean(newParams[3]);

  WideString swLabel;
  if (IsExpandedParamKnown(newParams[4]))
    swLabel = pRuntime->ToWideString(newParams[4]);

  constexpr int kMaxWideChars = 1024;
  constexpr int kMaxBytes = kMaxWideChars * sizeof(uint16_t);
  FixedZeroedDataVector<uint16_t> buffer(kMaxWideChars);
  pdfium::span<uint16_t> buffer_span = buffer.writable_span();
  int byte_length = pRuntime->GetFormFillEnv()->JS_appResponse(
      swQuestion, swTitle, swDefault, swLabel, bPassword,
      pdfium::as_writable_bytes(buffer_span));
  if (byte_length < 0 || byte_length > kMaxBytes)
    return CJS_Result::Failure(JSMessage::kParamTooLongError);

  buffer_span = buffer_span.first(
      std::min<size_t>(kMaxWideChars, byte_length / sizeof(uint16_t)));
  return CJS_Result::Success(pRuntime->NewString(
      WideString::FromUTF16LE(buffer_span.data(), buffer_span.size())
          .AsStringView()));
}

CJS_Result CJS_App::get_media(CJS_Runtime* pRuntime) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::set_media(CJS_Runtime* pRuntime, v8::Local<v8::Value> vp) {
  return CJS_Result::Failure(JSMessage::kNotSupportedError);
}

CJS_Result CJS_App::execDialog(CJS_Runtime* pRuntime,
                               pdfium::span<v8::Local<v8::Value>> params) {
  return CJS_Result::Success();
}