// Copyright 2016 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.

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

#include "core/fpdfdoc/cpdf_action.h"

#include "constants/stream_dict_common.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfdoc/cpdf_filespec.h"
#include "third_party/base/cxx17_backports.h"

namespace {

const char* const kActionTypeStrings[] = {
    "GoTo",       "GoToR",     "GoToE",      "Launch",     "Thread",
    "URI",        "Sound",     "Movie",      "Hide",       "Named",
    "SubmitForm", "ResetForm", "ImportData", "JavaScript", "SetOCGState",
    "Rendition",  "Trans",     "GoTo3DView"};

}  // namespace

CPDF_Action::CPDF_Action(const CPDF_Dictionary* pDict) : m_pDict(pDict) {}

CPDF_Action::CPDF_Action(const CPDF_Action& that) = default;

CPDF_Action::~CPDF_Action() = default;

CPDF_Action::Type CPDF_Action::GetType() const {
  if (!m_pDict)
    return Type::kUnknown;

  // Validate |m_pDict|. Type is optional, but must be valid if present.
  const CPDF_Object* pType = m_pDict->GetObjectFor("Type");
  if (pType) {
    const CPDF_Name* pName = pType->AsName();
    if (!pName || pName->GetString() != "Action")
      return Type::kUnknown;
  }

  ByteString csType = m_pDict->GetNameFor("S");
  if (csType.IsEmpty())
    return Type::kUnknown;

  static_assert(
      pdfium::size(kActionTypeStrings) == static_cast<size_t>(Type::kLast),
      "Type mismatch");
  for (size_t i = 0; i < pdfium::size(kActionTypeStrings); ++i) {
    if (csType == kActionTypeStrings[i])
      return static_cast<Type>(i + 1);
  }
  return Type::kUnknown;
}

CPDF_Dest CPDF_Action::GetDest(CPDF_Document* pDoc) const {
  Type type = GetType();
  if (type != Type::kGoTo && type != Type::kGoToR && type != Type::kGoToE) {
    return CPDF_Dest(nullptr);
  }
  return CPDF_Dest::Create(pDoc, m_pDict->GetDirectObjectFor("D"));
}

WideString CPDF_Action::GetFilePath() const {
  Type type = GetType();
  if (type != Type::kGoToR && type != Type::kGoToE && type != Type::kLaunch &&
      type != Type::kSubmitForm && type != Type::kImportData) {
    return WideString();
  }

  const CPDF_Object* pFile = m_pDict->GetDirectObjectFor(pdfium::stream::kF);
  if (pFile)
    return CPDF_FileSpec(pFile).GetFileName();

  if (type != Type::kLaunch)
    return WideString();

  const CPDF_Dictionary* pWinDict = m_pDict->GetDictFor("Win");
  if (!pWinDict)
    return WideString();

  return WideString::FromDefANSI(
      pWinDict->GetStringFor(pdfium::stream::kF).AsStringView());
}

ByteString CPDF_Action::GetURI(const CPDF_Document* pDoc) const {
  if (GetType() != Type::kURI)
    return ByteString();

  ByteString csURI = m_pDict->GetStringFor("URI");
  const CPDF_Dictionary* pRoot = pDoc->GetRoot();
  const CPDF_Dictionary* pURI = pRoot->GetDictFor("URI");
  if (pURI) {
    auto result = csURI.Find(":");
    if (!result.has_value() || result.value() == 0) {
      auto* pBase = pURI->GetDirectObjectFor("Base");
      if (pBase && (pBase->IsString() || pBase->IsStream()))
        csURI = pBase->GetString() + csURI;
    }
  }
  return csURI;
}

bool CPDF_Action::GetHideStatus() const {
  return m_pDict->GetBooleanFor("H", true);
}

ByteString CPDF_Action::GetNamedAction() const {
  return m_pDict->GetStringFor("N");
}

uint32_t CPDF_Action::GetFlags() const {
  return m_pDict->GetIntegerFor("Flags");
}

std::vector<const CPDF_Object*> CPDF_Action::GetAllFields() const {
  std::vector<const CPDF_Object*> result;
  if (!m_pDict)
    return result;

  ByteString csType = m_pDict->GetStringFor("S");
  const CPDF_Object* pFields = csType == "Hide"
                                   ? m_pDict->GetDirectObjectFor("T")
                                   : m_pDict->GetArrayFor("Fields");
  if (!pFields)
    return result;

  if (pFields->IsDictionary() || pFields->IsString()) {
    result.push_back(pFields);
  } else if (const CPDF_Array* pArray = pFields->AsArray()) {
    for (size_t i = 0; i < pArray->size(); ++i) {
      const CPDF_Object* pObj = pArray->GetDirectObjectAt(i);
      if (pObj)
        result.push_back(pObj);
    }
  }
  return result;
}

absl::optional<WideString> CPDF_Action::MaybeGetJavaScript() const {
  const CPDF_Object* pObject = GetJavaScriptObject();
  if (!pObject)
    return absl::nullopt;
  return pObject->GetUnicodeText();
}

WideString CPDF_Action::GetJavaScript() const {
  const CPDF_Object* pObject = GetJavaScriptObject();
  return pObject ? pObject->GetUnicodeText() : WideString();
}

size_t CPDF_Action::GetSubActionsCount() const {
  if (!m_pDict || !m_pDict->KeyExist("Next"))
    return 0;

  const CPDF_Object* pNext = m_pDict->GetDirectObjectFor("Next");
  if (!pNext)
    return 0;
  if (pNext->IsDictionary())
    return 1;
  const CPDF_Array* pArray = pNext->AsArray();
  return pArray ? pArray->size() : 0;
}

CPDF_Action CPDF_Action::GetSubAction(size_t iIndex) const {
  if (!m_pDict || !m_pDict->KeyExist("Next"))
    return CPDF_Action(nullptr);

  const CPDF_Object* pNext = m_pDict->GetDirectObjectFor("Next");
  if (const CPDF_Array* pArray = ToArray(pNext))
    return CPDF_Action(pArray->GetDictAt(iIndex));
  if (const CPDF_Dictionary* pDict = ToDictionary(pNext)) {
    if (iIndex == 0)
      return CPDF_Action(pDict);
  }
  return CPDF_Action(nullptr);
}

const CPDF_Object* CPDF_Action::GetJavaScriptObject() const {
  if (!m_pDict)
    return nullptr;

  const CPDF_Object* pJS = m_pDict->GetDirectObjectFor("JS");
  return (pJS && (pJS->IsString() || pJS->IsStream())) ? pJS : nullptr;
}