// Copyright 2017 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/cxfa_xmllocale.h"

#include <utility>

#include "core/fxcrt/cfx_read_only_span_stream.h"
#include "core/fxcrt/fx_codepage.h"
#include "core/fxcrt/xml/cfx_xmldocument.h"
#include "core/fxcrt/xml/cfx_xmlelement.h"
#include "core/fxcrt/xml/cfx_xmlparser.h"
#include "third_party/base/check.h"
#include "xfa/fxfa/parser/cxfa_document.h"
#include "xfa/fxfa/parser/cxfa_localemgr.h"
#include "xfa/fxfa/parser/cxfa_nodelocale.h"
#include "xfa/fxfa/parser/cxfa_timezoneprovider.h"
#include "xfa/fxfa/parser/xfa_utils.h"

namespace {

constexpr wchar_t kNumberSymbols[] = L"numberSymbols";
constexpr wchar_t kNumberSymbol[] = L"numberSymbol";
constexpr wchar_t kCurrencySymbols[] = L"currencySymbols";
constexpr wchar_t kCurrencySymbol[] = L"currencySymbol";

}  // namespace

// static
CXFA_XMLLocale* CXFA_XMLLocale::Create(cppgc::Heap* heap,
                                       pdfium::span<uint8_t> data) {
  auto stream = pdfium::MakeRetain<CFX_ReadOnlySpanStream>(data);
  CFX_XMLParser parser(stream);
  auto doc = parser.Parse();
  if (!doc)
    return nullptr;

  for (auto* child = doc->GetRoot()->GetFirstChild(); child;
       child = child->GetNextSibling()) {
    CFX_XMLElement* elem = ToXMLElement(child);
    if (elem && elem->GetName().EqualsASCII("locale")) {
      return cppgc::MakeGarbageCollected<CXFA_XMLLocale>(
          heap->GetAllocationHandle(), std::move(doc), elem);
    }
  }
  return nullptr;
}

CXFA_XMLLocale::CXFA_XMLLocale(std::unique_ptr<CFX_XMLDocument> doc,
                               const CFX_XMLElement* locale)
    : xml_doc_(std::move(doc)), locale_(locale) {
  DCHECK(xml_doc_);
  DCHECK(locale_);
}

CXFA_XMLLocale::~CXFA_XMLLocale() = default;

void CXFA_XMLLocale::Trace(cppgc::Visitor* visitor) const {}

WideString CXFA_XMLLocale::GetName() const {
  return locale_->GetAttribute(L"name");
}

WideString CXFA_XMLLocale::GetDecimalSymbol() const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(kNumberSymbols);
  return patterns ? GetPattern(patterns, kNumberSymbol, L"decimal")
                  : WideString();
}

WideString CXFA_XMLLocale::GetGroupingSymbol() const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(kNumberSymbols);
  return patterns ? GetPattern(patterns, kNumberSymbol, L"grouping")
                  : WideString();
}

WideString CXFA_XMLLocale::GetPercentSymbol() const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(kNumberSymbols);
  return patterns ? GetPattern(patterns, kNumberSymbol, L"percent")
                  : WideString();
}

WideString CXFA_XMLLocale::GetMinusSymbol() const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(kNumberSymbols);
  return patterns ? GetPattern(patterns, kNumberSymbol, L"minus")
                  : WideString();
}

WideString CXFA_XMLLocale::GetCurrencySymbol() const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(kCurrencySymbols);
  return patterns ? GetPattern(patterns, kCurrencySymbol, L"symbol")
                  : WideString();
}

WideString CXFA_XMLLocale::GetDateTimeSymbols() const {
  CFX_XMLElement* symbols = locale_->GetFirstChildNamed(L"dateTimeSymbols");
  return symbols ? symbols->GetTextData() : WideString();
}

WideString CXFA_XMLLocale::GetMonthName(int32_t nMonth, bool bAbbr) const {
  return GetCalendarSymbol(L"month", nMonth, bAbbr);
}

WideString CXFA_XMLLocale::GetDayName(int32_t nWeek, bool bAbbr) const {
  return GetCalendarSymbol(L"day", nWeek, bAbbr);
}

WideString CXFA_XMLLocale::GetMeridiemName(bool bAM) const {
  return GetCalendarSymbol(L"meridiem", bAM ? 0 : 1, false);
}

int CXFA_XMLLocale::GetTimeZoneInMinutes() const {
  return CXFA_TimeZoneProvider().GetTimeZoneInMinutes();
}

WideString CXFA_XMLLocale::GetEraName(bool bAD) const {
  return GetCalendarSymbol(L"era", bAD ? 1 : 0, false);
}

WideString CXFA_XMLLocale::GetCalendarSymbol(WideStringView symbol,
                                             size_t index,
                                             bool bAbbr) const {
  CFX_XMLElement* child = locale_->GetFirstChildNamed(L"calendarSymbols");
  if (!child)
    return WideString();

  WideString pstrSymbolNames = symbol + L"Names";
  CFX_XMLElement* name_child = nullptr;
  for (auto* name = child->GetFirstChild(); name;
       name = name->GetNextSibling()) {
    CFX_XMLElement* elem = ToXMLElement(name);
    if (!elem || elem->GetName() != pstrSymbolNames)
      continue;

    WideString abbr = elem->GetAttribute(L"abbr");
    bool abbr_value = false;
    if (!abbr.IsEmpty())
      abbr_value = abbr.EqualsASCII("1");
    if (abbr_value != bAbbr)
      continue;

    name_child = elem;
    break;
  }
  if (!name_child)
    return WideString();

  CFX_XMLElement* sym_element = name_child->GetNthChildNamed(symbol, index);
  return sym_element ? sym_element->GetTextData() : WideString();
}

WideString CXFA_XMLLocale::GetDatePattern(DateTimeSubcategory eType) const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(L"datePatterns");
  if (!patterns)
    return WideString();

  WideString wsName;
  switch (eType) {
    case DateTimeSubcategory::kShort:
      wsName = L"short";
      break;
    case DateTimeSubcategory::kDefault:
    case DateTimeSubcategory::kMedium:
      wsName = L"med";
      break;
    case DateTimeSubcategory::kFull:
      wsName = L"full";
      break;
    case DateTimeSubcategory::kLong:
      wsName = L"long";
      break;
  }
  return GetPattern(patterns, L"datePattern", wsName.AsStringView());
}

WideString CXFA_XMLLocale::GetTimePattern(DateTimeSubcategory eType) const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(L"timePatterns");
  if (!patterns)
    return WideString();

  WideString wsName;
  switch (eType) {
    case DateTimeSubcategory::kShort:
      wsName = L"short";
      break;
    case DateTimeSubcategory::kDefault:
    case DateTimeSubcategory::kMedium:
      wsName = L"med";
      break;
    case DateTimeSubcategory::kFull:
      wsName = L"full";
      break;
    case DateTimeSubcategory::kLong:
      wsName = L"long";
      break;
  }
  return GetPattern(patterns, L"timePattern", wsName.AsStringView());
}

WideString CXFA_XMLLocale::GetNumPattern(NumSubcategory eType) const {
  CFX_XMLElement* patterns = locale_->GetFirstChildNamed(L"numberPatterns");
  return patterns ? XFA_PatternToString(eType) : WideString();
}

WideString CXFA_XMLLocale::GetPattern(CFX_XMLElement* patterns,
                                      WideStringView bsTag,
                                      WideStringView wsName) const {
  for (auto* child = patterns->GetFirstChild(); child;
       child = child->GetNextSibling()) {
    CFX_XMLElement* pattern = ToXMLElement(child);
    if (pattern && pattern->GetName() == bsTag &&
        pattern->GetAttribute(L"name") == wsName) {
      return pattern->GetTextData();
    }
  }
  return WideString();
}