/**********************************************************************

  Audacity: A Digital Audio Editor

  Internat.cpp

  Markus Meyer
  Dominic Mazzoni (Mac OS X code)

*******************************************************************//*!

\class Internat
\brief Internationalisation support.

This class is used to help internationalisation and in general
compatibility with different locales and character sets.
It deals mostly with converting numbers, but also has important
functions to convert to/from UTF-8, which is used in XML files
and on Mac OS X for the filesystem.

*//*******************************************************************/

#include "Internat.h"

#include "Experimental.h"
#include "MemoryX.h"

#include <wx/log.h>
#include <wx/intl.h>
#include <wx/filename.h>

#include <locale.h>
#include <math.h> // for pow()

#include "../include/audacity/ComponentInterface.h"

// in order for the static member variables to exist, they must appear here
// (_outside_) the class definition, in order to be allocated some storage.
// Otherwise, you get link errors.

wxChar Internat::mDecimalSeparator = wxT('.'); // default
wxArrayString Internat::exclude;

// DA: Use tweaked translation mechanism to replace 'Audacity' by 'DarkAudacity'.
#ifdef EXPERIMENTAL_DA
// This function allows us to replace Audacity by DarkAudacity without peppering 
// the source code with changes.  We split out this step, the customisation, as 
// it is used on its own (without translation) in the wxTS macro.
AUDACITY_DLL_API const wxString& GetCustomSubstitution(const wxString& str2)
{
   // If contains 'DarkAudacity, already converted.
   if( str2.Contains( "DarkAudacity" ))
      return str2;
   // If does not contain 'Audacity', nothing to do.
   if( !str2.Contains( "Audacity" ))
      return str2;
   wxString str3 = str2;
   str3.Replace( "Audacity", "DarkAudacity" );
   str3.Replace( " an DarkAudacity", " a DarkAudacity" );
   // DA also renames sync-lock(ed) as time-lock(ed).
   str3.Replace( "Sync-Lock", "Time-Lock" );
   str3.Replace( "Sync-&Lock", "Time-&Lock" );
   str3.Replace( "Sync Lock", "Time Lock" );
   return wxTranslations::GetUntranslatedString(str3);
}
#else 
AUDACITY_DLL_API const wxString& GetCustomSubstitution(const wxString& str1)
{
   return str1 ;
}
#endif

// In any translated string, we can replace the name 'Audacity' by 'DarkAudacity'
// without requiring translators to see extra strings for the two versions.
AUDACITY_DLL_API const wxString& GetCustomTranslation(const wxString& str1)
{
   const wxString& str2 = wxGetTranslation( str1 );
   return GetCustomSubstitution( str2 );
}


void Internat::Init()
{
   // Save decimal point character
   struct lconv * localeInfo = localeconv();
   if (localeInfo)
      mDecimalSeparator = wxString(wxSafeConvertMB2WX(localeInfo->decimal_point)).GetChar(0);

//   wxLogDebug(wxT("Decimal separator set to '%c'"), mDecimalSeparator);

   // Setup list of characters that aren't allowed in file names
   // Hey!  The default wxPATH_NATIVE does not do as it should.
#if defined(__WXMAC__)
   wxPathFormat format = wxPATH_MAC;
#elif defined(__WXGTK__)
   wxPathFormat format = wxPATH_UNIX;
#elif defined(__WXMSW__)
   wxPathFormat format = wxPATH_WIN;
#endif

   // This is supposed to return characters not permitted in paths to files
   // or to directories
   auto forbid = wxFileName::GetForbiddenChars(format);

   for(auto cc: forbid)
      exclude.push_back(wxString{ cc });

   // The path separators may not be forbidden, so add them
   auto separators = wxFileName::GetPathSeparators(format);

   for(auto cc: separators) {
      if (forbid.Find(cc) == wxNOT_FOUND)
         exclude.push_back(wxString{ cc });
   }
}

wxChar Internat::GetDecimalSeparator()
{
   return mDecimalSeparator;
}

bool Internat::CompatibleToDouble(const wxString& stringToConvert, double* result)
{
   // Regardless of the locale, always respect comma _and_ point
   wxString s = stringToConvert;
   s.Replace(wxT(","), wxString(GetDecimalSeparator()));
   s.Replace(wxT("."), wxString(GetDecimalSeparator()));
   return s.ToDouble(result);
}

double Internat::CompatibleToDouble(const wxString& stringToConvert)
{
   double result = 0;
   Internat::CompatibleToDouble(stringToConvert, &result);
   return result;
}

wxString Internat::ToString(double numberToConvert,
                     int digitsAfterDecimalPoint /* = -1 */)
{
   wxString result = ToDisplayString(
      numberToConvert, digitsAfterDecimalPoint);

   result.Replace(wxString(GetDecimalSeparator()), wxT("."));

   return result;
}

wxString Internat::ToDisplayString(double numberToConvert,
                                    int digitsAfterDecimalPoint /* = -1 */)
{
   wxString decSep = wxString(GetDecimalSeparator());
   wxString result;

   if (digitsAfterDecimalPoint == -1)
   {
      result.Printf(wxT("%f"), numberToConvert);

      // Not all libcs respect the decimal separator, so always convert
      // any dots found to the decimal separator.
      result.Replace(wxT("."), decSep);

      if (result.Find(decSep) != -1)
      {
         // Strip trailing zeros, but leave one, and decimal separator.
         int pos = result.length() - 1;
         while ((pos > 1) &&
                  (result.GetChar(pos) == wxT('0')) &&
                  (result.GetChar(pos - 1) != decSep))
            pos--;
         // (Previous code removed all of them and decimal separator.)
         //    if (result.GetChar(pos) == decSep)
         //       pos--; // strip point before empty fractional part
         result = result.Left(pos+1);
      }
   }
   else
   {
      wxString format;
      format.Printf(wxT("%%.%if"), digitsAfterDecimalPoint);
      result.Printf(format, numberToConvert);

      // Not all libcs respect the decimal separator, so always convert
      // any dots found to the decimal separator
      result.Replace(wxT("."), decSep);
   }

   return result;
}

wxString Internat::FormatSize(wxLongLong size)
{
   /* wxLongLong contains no built-in conversion to double */
   double dSize = size.GetHi() * pow(2.0, 32);  // 2 ^ 32
   dSize += size.GetLo();

   return FormatSize(dSize);
}

wxString Internat::FormatSize(double size)
{
   wxString sizeStr;

   if (size == -1)
      sizeStr = _("Unable to determine");
   else {
      /* make it look nice, by formatting into k, MB, etc */
      if (size < 1024.0)
         sizeStr = ToDisplayString(size) + wxT(" ") + _("bytes");
      else if (size < 1024.0 * 1024.0) {
         /* i18n-hint: Abbreviation for Kilo bytes */
         sizeStr = ToDisplayString(size / 1024.0, 1) + wxT(" ") + _("KB");
      }
      else if (size < 1024.0 * 1024.0 * 1024.0) {
         /* i18n-hint: Abbreviation for Mega bytes */
         sizeStr = ToDisplayString(size / (1024.0 * 1024.0), 1) + wxT(" ") + _("MB");
      }
      else {
         /* i18n-hint: Abbreviation for Giga bytes */
         sizeStr = ToDisplayString(size / (1024.0 * 1024.0 * 1024.0), 1) + wxT(" ") + _("GB");
      }
   }

   return sizeStr;
}

bool Internat::SanitiseFilename(wxString &name, const wxString &sub)
{
   bool result = false;
   for(const auto &item : exclude)
   {
      if(name.Contains(item))
      {
         name.Replace(item, sub);
         result = true;
      }
   }

#ifdef __WXMAC__
   // Special Mac stuff
   // '/' is permitted in file names as seen in dialogs, even though it is
   // the path separator.  The "real" filename as seen in the terminal has ':'.
   // Do NOT return true if this is the only substitution.
   name.Replace(wxT("/"), wxT(":"));
#endif

   return result;
}

wxString Internat::StripAccelerators(const wxString &s)
{
   wxString result;
   result.reserve(s.length());
   for(size_t i = 0; i < s.length(); i++) {
      if (s[i] == '\t')
         break;
      if (s[i] != '&' && s[i] != '.')
         result += s[i];
   }
   return result;
}

TranslatableStrings Msgids(
   const EnumValueSymbol strings[], size_t nStrings)
{
   return transform_range<TranslatableStrings>(
      strings, strings + nStrings,
      std::mem_fn( &EnumValueSymbol::Msgid )
   );
}

TranslatableStrings Msgids( const std::vector<EnumValueSymbol> &strings )
{
   return Msgids( strings.data(), strings.size() );
}

// Find a better place for this?
#include "audacity/Types.h"
Identifier::Identifier(
                       std::initializer_list<Identifier> components, wxChar separator )
{
   if( components.size() < 2 )
   {
      wxASSERT( false );
      return;
   }
   auto iter = components.begin(), end = components.end();
   value = (*iter++).value;
   while (iter != end)
      value += separator + (*iter++).value;
}

std::vector< Identifier > Identifier::split( wxChar separator ) const
{
   auto strings = ::wxSplit( value, separator );
   return { strings.begin(), strings.end() };
}

const wxChar *const TranslatableString::NullContextName = wxT("*");

const TranslatableString::Formatter
TranslatableString::NullContextFormatter {
   [](const wxString & str, TranslatableString::Request request) -> wxString {
      switch ( request ) {
         case Request::Context:
            return NullContextName;
         case Request::Format:
         case Request::DebugFormat:
         default:
            return str;
      }
   }
};

bool TranslatableString::IsVerbatim() const
{
   return DoGetContext( mFormatter ) == NullContextName;
}

TranslatableString &TranslatableString::Strip( unsigned codes ) &
{
   auto prevFormatter = mFormatter;
   mFormatter = [prevFormatter, codes]
   ( const wxString & str, TranslatableString::Request request ) -> wxString {
      switch ( request ) {
         case Request::Context:
            return TranslatableString::DoGetContext( prevFormatter );
         case Request::Format:
         case Request::DebugFormat:
         default: {
            bool debug = request == Request::DebugFormat;
            auto result =
               TranslatableString::DoSubstitute( prevFormatter, str, debug );
            if ( codes & MenuCodes )
               result = wxStripMenuCodes( result );
            if ( codes & Ellipses ) {
               if (result.EndsWith(wxT("...")))
                  result = result.Left( result.length() - 3 );
               // Also check for the single-character Unicode ellipsis
               else if (result.EndsWith(wxT("\u2026")))
                  result = result.Left( result.length() - 1 );
            }
            return result;
         }
      }
   };
   
   return *this;
}

wxString TranslatableString::DoGetContext( const Formatter &formatter )
{
   return formatter ? formatter( {}, Request::Context ) : wxString{};
}

wxString TranslatableString::DoSubstitute(
   const Formatter &formatter, const wxString &format, bool debug )
{
   return formatter
      ? formatter( format, debug ? Request::DebugFormat : Request::Format )
      : // come here for most translatable strings, which have no formatting
         ( debug ? format : wxGetTranslation( format ) );
}

wxString TranslatableString::DoChooseFormat(
   const Formatter &formatter,
   const wxString &singular, const wxString &plural, unsigned nn, bool debug )
{
   // come here for translatable strings that choose among forms by number;
   // if not debugging, then two keys are passed to an overload of
   // wxGetTranslation, and also a number.
   // Some languages might choose among more or fewer than two forms
   // (e.g. Arabic has duals and Russian has complicated declension rules)
   wxString context;
   return ( debug || NullContextName == (context = DoGetContext(formatter)) )
      ? ( nn == 1 ? singular : plural )
      : wxGetTranslation(
            singular, plural, nn
            // , wxString{}
            // , context
         );
}

TranslatableString &TranslatableString::Join(
   const TranslatableString arg, const wxString &separator ) &
{
   auto prevFormatter = mFormatter;
   mFormatter =
   [prevFormatter,
    arg /* = std::move( arg ) */,
    separator](const wxString &str, Request request)
      -> wxString {
      switch ( request ) {
         case Request::Context:
            return TranslatableString::DoGetContext( prevFormatter );
         case Request::Format:
         case Request::DebugFormat:
         default: {
            bool debug = request == Request::DebugFormat;
            return
               TranslatableString::DoSubstitute( prevFormatter, str, debug )
                  + separator
                  + arg.DoFormat( debug );
         }
      }
   };
   return *this;
}

const TranslatableString TranslatableString::Inaudible{ wxT("\a") };
