// 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 "xfa/fxfa/parser/xfa_document_datamerger_imp.h"

#include "xfa/fxfa/parser/cxfa_document.h"
#include "xfa/fxfa/parser/cxfa_node.h"

bool XFA_DataMerge_NeedGenerateForm(CXFA_Node* pTemplateChild,
                                    bool bUseInstanceManager) {
  XFA_Element eType = pTemplateChild->GetElementType();
  if (eType == XFA_Element::Variables) {
    return true;
  }
  if (pTemplateChild->IsContainerNode()) {
    return false;
  }
  if (eType == XFA_Element::Proto ||
      (bUseInstanceManager && eType == XFA_Element::Occur)) {
    return false;
  }
  return true;
}

CXFA_Node* XFA_DataMerge_FindFormDOMInstance(CXFA_Document* document,
                                             XFA_Element eType,
                                             uint32_t dwNameHash,
                                             CXFA_Node* pFormParent) {
  CXFA_Node* pFormChild = pFormParent->GetFirstChild();
  for (; pFormChild; pFormChild = pFormChild->GetNextSibling()) {
    if (pFormChild->GetElementType() == eType &&
        pFormChild->GetNameHash() == dwNameHash && pFormChild->IsUnusedNode()) {
      return pFormChild;
    }
  }
  return nullptr;
}

CXFA_Node* XFA_NodeMerge_CloneOrMergeContainer(
    CXFA_Document* document,
    CXFA_Node* pFormParent,
    CXFA_Node* pTemplateNode,
    bool bRecursive,
    std::vector<CXFA_Node*>* pSubformArray) {
  if (pTemplateNode->GetPacketType() != XFA_PacketType::Template) {
    return nullptr;
  }
  CXFA_Node* pExistingNode = nullptr;
  if (!pSubformArray) {
    pExistingNode = XFA_DataMerge_FindFormDOMInstance(
        document, pTemplateNode->GetElementType(), pTemplateNode->GetNameHash(),
        pFormParent);
  } else if (!pSubformArray->empty()) {
    pExistingNode = pSubformArray->front();
    pSubformArray->erase(pSubformArray->begin());
  }
  if (pExistingNode) {
    if (pSubformArray) {
      pFormParent->InsertChildAndNotify(pExistingNode, nullptr);
    } else if (pExistingNode->IsContainerNode()) {
      pFormParent->RemoveChildAndNotify(pExistingNode, true);
      pFormParent->InsertChildAndNotify(pExistingNode, nullptr);
    }
    pExistingNode->ClearFlag(XFA_NodeFlag::kUnusedNode);
    pExistingNode->SetTemplateNode(pTemplateNode);
    if (bRecursive && pExistingNode->GetElementType() != XFA_Element::Items) {
      for (CXFA_Node* pTemplateChild = pTemplateNode->GetFirstChild();
           pTemplateChild; pTemplateChild = pTemplateChild->GetNextSibling()) {
        if (XFA_DataMerge_NeedGenerateForm(pTemplateChild, true)) {
          XFA_NodeMerge_CloneOrMergeContainer(
              document, pExistingNode, pTemplateChild, bRecursive, nullptr);
        }
      }
    }
    pExistingNode->SetInitializedFlagAndNotify();
    return pExistingNode;
  }

  CXFA_Node* pNewNode = pTemplateNode->CloneTemplateToForm(false);
  if (!pNewNode) {
    return nullptr;
  }

  pFormParent->InsertChildAndNotify(pNewNode, nullptr);

  if (!bRecursive) {
    return pNewNode;
  }

  for (CXFA_Node* pTemplateChild = pTemplateNode->GetFirstChild();
       pTemplateChild; pTemplateChild = pTemplateChild->GetNextSibling()) {
    if (pTemplateChild->GetPacketType() == XFA_PacketType::Template &&
        XFA_DataMerge_NeedGenerateForm(pTemplateChild, true)) {
      CXFA_Node* pNewChild = pTemplateChild->CloneTemplateToForm(true);
      if (pNewChild) {
        pNewNode->InsertChildAndNotify(pNewChild, nullptr);
      }
    }
  }
  return pNewNode;
}

CXFA_Node* XFA_DataMerge_FindDataScope(CXFA_Node* pParentFormNode) {
  if (!pParentFormNode) {
    return nullptr;
  }

  for (CXFA_Node* pRootBoundNode = pParentFormNode;
       pRootBoundNode && pRootBoundNode->IsContainerNode();
       pRootBoundNode = pRootBoundNode->GetParent()) {
    CXFA_Node* pDataScope = pRootBoundNode->GetBindData();
    if (pDataScope) {
      return pDataScope;
    }
  }
  return ToNode(
      pParentFormNode->GetDocument()->GetXFAObject(XFA_HASHCODE_Data));
}