// 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 "xfa/fxfa/cxfa_textprovider.h"

#include <algorithm>
#include <memory>
#include <vector>

#include "core/fxcrt/xml/cfx_xmlelement.h"
#include "core/fxcrt/xml/cfx_xmlnode.h"
#include "fxjs/cfxjse_engine.h"
#include "fxjs/cfxjse_value.h"
#include "fxjs/xfa/cjx_object.h"
#include "xfa/fde/cfde_textout.h"
#include "xfa/fxfa/cxfa_eventparam.h"
#include "xfa/fxfa/cxfa_ffapp.h"
#include "xfa/fxfa/cxfa_ffcheckbutton.h"
#include "xfa/fxfa/cxfa_ffdoc.h"
#include "xfa/fxfa/cxfa_ffdocview.h"
#include "xfa/fxfa/cxfa_fffield.h"
#include "xfa/fxfa/cxfa_ffpageview.h"
#include "xfa/fxfa/cxfa_ffwidget.h"
#include "xfa/fxfa/cxfa_fontmgr.h"
#include "xfa/fxfa/cxfa_fwladapterwidgetmgr.h"
#include "xfa/fxfa/parser/cxfa_caption.h"
#include "xfa/fxfa/parser/cxfa_font.h"
#include "xfa/fxfa/parser/cxfa_items.h"
#include "xfa/fxfa/parser/cxfa_layoutprocessor.h"
#include "xfa/fxfa/parser/cxfa_localevalue.h"
#include "xfa/fxfa/parser/cxfa_node.h"
#include "xfa/fxfa/parser/cxfa_para.h"
#include "xfa/fxfa/parser/cxfa_value.h"
#include "xfa/fxfa/parser/xfa_resolvenode_rs.h"
#include "xfa/fxfa/parser/xfa_utils.h"

CXFA_Node* CXFA_TextProvider::GetTextNode(bool& bRichText) {
  bRichText = false;

  if (m_eType == XFA_TEXTPROVIDERTYPE_Text) {
    CXFA_Value* pValueNode =
        m_pNode->GetChild<CXFA_Value>(0, XFA_Element::Value, false);
    if (!pValueNode)
      return nullptr;

    CXFA_Node* pChildNode = pValueNode->GetFirstChild();
    if (pChildNode && pChildNode->GetElementType() == XFA_Element::ExData) {
      Optional<WideString> contentType = pChildNode->JSObject()->TryAttribute(
          XFA_Attribute::ContentType, false);
      if (contentType.has_value() &&
          contentType.value().EqualsASCII("text/html")) {
        bRichText = true;
      }
    }
    return pChildNode;
  }

  if (m_eType == XFA_TEXTPROVIDERTYPE_Datasets) {
    CXFA_Node* pBind = m_pNode->GetBindData();
    CFX_XMLNode* pXMLNode = pBind->GetXMLMappingNode();
    for (CFX_XMLNode* pXMLChild = pXMLNode->GetFirstChild(); pXMLChild;
         pXMLChild = pXMLChild->GetNextSibling()) {
      CFX_XMLElement* pElement = ToXMLElement(pXMLChild);
      if (pElement && XFA_RecognizeRichText(pElement)) {
        bRichText = true;
        break;
      }
    }
    return pBind;
  }

  if (m_eType == XFA_TEXTPROVIDERTYPE_Caption) {
    CXFA_Caption* pCaptionNode =
        m_pNode->GetChild<CXFA_Caption>(0, XFA_Element::Caption, false);
    if (!pCaptionNode)
      return nullptr;

    CXFA_Value* pValueNode =
        pCaptionNode->GetChild<CXFA_Value>(0, XFA_Element::Value, false);
    if (!pValueNode)
      return nullptr;

    CXFA_Node* pChildNode = pValueNode->GetFirstChild();
    if (pChildNode && pChildNode->GetElementType() == XFA_Element::ExData) {
      Optional<WideString> contentType = pChildNode->JSObject()->TryAttribute(
          XFA_Attribute::ContentType, false);
      if (contentType.has_value() &&
          contentType.value().EqualsASCII("text/html")) {
        bRichText = true;
      }
    }
    return pChildNode;
  }

  CXFA_Items* pItemNode =
      m_pNode->GetChild<CXFA_Items>(0, XFA_Element::Items, false);
  if (!pItemNode)
    return nullptr;

  CXFA_Node* pNode = pItemNode->GetFirstChild();
  while (pNode) {
    WideString wsName = pNode->JSObject()->GetCData(XFA_Attribute::Name);
    if (m_eType == XFA_TEXTPROVIDERTYPE_Rollover &&
        wsName.EqualsASCII("rollover")) {
      return pNode;
    }
    if (m_eType == XFA_TEXTPROVIDERTYPE_Down && wsName.EqualsASCII("down"))
      return pNode;

    pNode = pNode->GetNextSibling();
  }
  return nullptr;
}

CXFA_Para* CXFA_TextProvider::GetParaIfExists() {
  if (m_eType == XFA_TEXTPROVIDERTYPE_Text)
    return m_pNode->GetParaIfExists();

  CXFA_Caption* pNode =
      m_pNode->GetChild<CXFA_Caption>(0, XFA_Element::Caption, false);
  return pNode->GetChild<CXFA_Para>(0, XFA_Element::Para, false);
}

CXFA_Font* CXFA_TextProvider::GetFontIfExists() {
  if (m_eType == XFA_TEXTPROVIDERTYPE_Text)
    return m_pNode->GetFontIfExists();

  CXFA_Caption* pNode =
      m_pNode->GetChild<CXFA_Caption>(0, XFA_Element::Caption, false);
  CXFA_Font* font = pNode->GetChild<CXFA_Font>(0, XFA_Element::Font, false);
  return font ? font : m_pNode->GetFontIfExists();
}

bool CXFA_TextProvider::IsCheckButtonAndAutoWidth() const {
  if (m_pNode->GetFFWidgetType() != XFA_FFWidgetType::kCheckButton)
    return false;
  return !m_pNode->TryWidth();
}

Optional<WideString> CXFA_TextProvider::GetEmbeddedObj(
    const WideString& wsAttr) const {
  if (m_eType != XFA_TEXTPROVIDERTYPE_Text)
    return {};

  CXFA_Node* pParent = m_pNode->GetParent();
  CXFA_Document* pDocument = m_pNode->GetDocument();
  CXFA_Node* pIDNode = nullptr;
  if (pParent)
    pIDNode = pDocument->GetNodeByID(pParent, wsAttr.AsStringView());

  if (!pIDNode) {
    pIDNode = pDocument->GetNodeByID(
        ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Form)),
        wsAttr.AsStringView());
  }
  if (!pIDNode || !pIDNode->IsWidgetReady())
    return {};

  return pIDNode->GetValue(XFA_VALUEPICTURE_Display);
}