// Copyright 2014 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 "../../include/fpdfdoc/fpdf_doc.h"

CPDF_LinkList::~CPDF_LinkList() {
  FX_POSITION pos = m_PageMap.GetStartPosition();
  while (pos) {
    void* key;
    void* value;
    m_PageMap.GetNextAssoc(pos, key, value);
    delete (CFX_PtrArray*)value;
  }
}
CFX_PtrArray* CPDF_LinkList::GetPageLinks(CPDF_Page* pPage) {
  FX_DWORD objnum = pPage->m_pFormDict->GetObjNum();
  if (objnum == 0) {
    return NULL;
  }
  CFX_PtrArray* pPageLinkList = NULL;
  if (!m_PageMap.Lookup((void*)(uintptr_t)objnum, (void*&)pPageLinkList)) {
    pPageLinkList = new CFX_PtrArray;
    m_PageMap.SetAt((void*)(uintptr_t)objnum, pPageLinkList);
    LoadPageLinks(pPage, pPageLinkList);
  }
  return pPageLinkList;
}
int CPDF_LinkList::CountLinks(CPDF_Page* pPage) {
  CFX_PtrArray* pPageLinkList = GetPageLinks(pPage);
  if (pPageLinkList == NULL) {
    return 0;
  }
  return pPageLinkList->GetSize();
}
CPDF_Link CPDF_LinkList::GetLink(CPDF_Page* pPage, int index) {
  CFX_PtrArray* pPageLinkList = GetPageLinks(pPage);
  if (!pPageLinkList) {
    return CPDF_Link();
  }
  return CPDF_Link((CPDF_Dictionary*)pPageLinkList->GetAt(index));
}
CPDF_Link CPDF_LinkList::GetLinkAtPoint(CPDF_Page* pPage,
                                        FX_FLOAT pdf_x,
                                        FX_FLOAT pdf_y) {
  CFX_PtrArray* pPageLinkList = GetPageLinks(pPage);
  if (!pPageLinkList) {
    return CPDF_Link();
  }
  int size = pPageLinkList->GetSize();
  for (int i = size - 1; i >= 0; --i) {
    CPDF_Link link((CPDF_Dictionary*)pPageLinkList->GetAt(i));
    CPDF_Rect rect = link.GetRect();
    if (rect.Contains(pdf_x, pdf_y)) {
      return link;
    }
  }
  return CPDF_Link();
}
void CPDF_LinkList::LoadPageLinks(CPDF_Page* pPage, CFX_PtrArray* pList) {
  CPDF_Array* pAnnotList = pPage->m_pFormDict->GetArray("Annots");
  if (pAnnotList == NULL) {
    return;
  }
  for (FX_DWORD i = 0; i < pAnnotList->GetCount(); i++) {
    CPDF_Dictionary* pAnnot = pAnnotList->GetDict(i);
    if (pAnnot == NULL) {
      continue;
    }
    if (pAnnot->GetString("Subtype") != "Link") {
      continue;
    }
    pList->Add(pAnnot);
  }
}
CPDF_Rect CPDF_Link::GetRect() {
  return m_pDict->GetRect("Rect");
}
CPDF_Dest CPDF_Link::GetDest(CPDF_Document* pDoc) {
  CPDF_Object* pDest = m_pDict->GetElementValue("Dest");
  if (pDest == NULL) {
    return CPDF_Dest();
  }
  if (pDest->GetType() == PDFOBJ_STRING || pDest->GetType() == PDFOBJ_NAME) {
    CPDF_NameTree name_tree(pDoc, FX_BSTRC("Dests"));
    CFX_ByteStringC name = pDest->GetString();
    return CPDF_Dest(name_tree.LookupNamedDest(pDoc, name));
  }
  if (pDest->GetType() == PDFOBJ_ARRAY) {
    return CPDF_Dest((CPDF_Array*)pDest);
  }
  return CPDF_Dest();
}
CPDF_Action CPDF_Link::GetAction() {
  return CPDF_Action(m_pDict->GetDict("A"));
}