/* vim:expandtab:ts=2 sw=2:
*/
/*  Grafx2 - The Ultimate 256-color bitmap paint program

    Copyright 2018 Thomas Bernard
    Copyright 2014 Sergii Pylypenko
    Copyright 2008 Yves Rizoud
    Copyright 2007 Adrien Destugues
    Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)

    Grafx2 is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; version 2
    of the License.

    Grafx2 is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Grafx2; if not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file readline.c
 * Text input GUI widget
 */

#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "const.h"
#include "struct.h"
#include "global.h"
#include "misc.h"
#include "errors.h"
#include "const.h"
#include "screen.h"
#include "readline.h"
#include "windows.h"
#include "input.h"
#include "engine.h"
#include "unicode.h"
#include "keycodes.h"

#ifdef WIN32
#include <windows.h>

#elif defined __HAIKU__
#include "haiku.h"
#elif defined(__AROS__)
#include <proto/iffparse.h>
#include <datatypes/textclass.h>
#endif
#if defined(__ANDROID__)
#include <SDL_screenkeyboard.h>
#endif

#ifdef _MSC_VER
#include <stdio.h>
#define strdup _strdup
#if _MSC_VER < 1900
#define snprintf _snprintf
#endif
#endif

#if defined(USE_X11)
#include <X11/Xlib.h>
extern Display * X11_display;
extern Window X11_window;
#elif defined(__macosx__)
const char * get_paste_board(void);
#endif

// Virtual keyboard is ON by default on these platforms:
#if defined(__GP2X__) || defined(__WIZ__) || defined(__CAANOO__) || defined(GCWZERO)
  #define VIRT_KEY_DEFAULT_ON 1
#else
  #define VIRT_KEY_DEFAULT_ON 0
#endif

#define TEXT_COLOR         MC_Black
#define BACKGROUND_COLOR          MC_Light
#define CURSOR_COLOR MC_Black
#define CURSOR_BACKGROUND_COLOR  MC_Dark

//! remove a character from a string
static void Remove_character(char * str, int position)
{
  for (;str[position]!='\0';position++)
    str[position]=str[position+1];
}

//! remove a character from a unicode string
static void Remove_character_unicode(word * str, int position)
{
  for (;str[position]!='\0';position++)
    str[position]=str[position+1];
}


//! Insert a character in string at position
static void Insert_character(char * str, char letter, int position)
{
  char temp_char;

  for (;letter!='\0';position++)
  {
    // On mémorise le caractère qui se trouve en "position"
    temp_char=str[position];
    // On splotch la lettre à insérer
    str[position]=letter;
    // On place le caractère mémorisé dans "letter" comme nouvelle lettre à insérer
    letter=temp_char;
  }
  // On termine la chaine
  str[position]='\0';
}

//! Insert a character in unicode string at position
static void Insert_character_unicode(word * str, word c, int position)
{
  for (;;)
  {
    word temp = str[position];
    str[position++] = c;
    if (c == 0)
      return; // we just have written the NULL terminator
    c = temp;
  }
}

//! Insert a string at the start of another. Up to MAX characters only.
//! @return actual number of chars inserted
static int Prepend_string(char* dest, const char* src, int max)
{
  // Insert src before dest
  int sized = strlen(dest);
  int sizes = strlen(src);

  if (sized + sizes >= max)
  {
    sizes = max - sized;
  }

  memmove(dest+sizes, dest, sized+1);
  memcpy(dest, src, sizes);
  return sizes;
}

//! Insert a unicode string at the start of another. Up to MAX characters only.
//! @return actual number of chars inserted
static int Prepend_string_unicode(word* dest, const word* src, int max)
{
  // Insert src before dest
  int sized = Unicode_strlen(dest);
  int sizes = Unicode_strlen(src);

  if (sized + sizes >= max)
  {
    sizes = max - sized;
  }

  memmove(dest+sizes, dest, 2*(sized+1));
  memcpy(dest, src, sizes*2);
  return sizes;
}

//! Check validy of character depending on input_type
//! @returns 0 = Not allowed
//! @returns 1 = Allowed
//! @returns 2 = Allowed only once at start of string (for - sign in numbers)
static int Valid_character(word c, enum INPUT_TYPE input_type)
{
  // On va regarder si l'utilisateur le droit de se servir de cette touche
  switch(input_type)
  {
    case INPUT_TYPE_STRING :
      if ((c>=' ' && c<= 255) || c=='\n')
        return 1;
      break;
    case INPUT_TYPE_INTEGER :
      if ( (c>='0') && (c<='9') )
        return 1;
      break;
    case INPUT_TYPE_DECIMAL:
      if ( (c>='0') && (c<='9') )
        return 1;
      else if (c=='-')
        return 2;
      else if (c=='.')
        return 1;
      break;
    case INPUT_TYPE_FILENAME:
    {
      // On regarde si la touche est autorisée
      // Sous Linux: Seul le / est strictement interdit, mais beaucoup
      // d'autres poseront des problèmes au shell, alors on évite.
      // Sous Windows : c'est moins grave car le fopen() échouerait de toutes façons.
      // AmigaOS4: Pas de ':' car utilisé pour les volumes.
#if defined(WIN32)
      char forbidden_char[] = {'/', '|', '?', '*', '<', '>', ':', '\\'};
#elif defined (__amigaos4__) || defined(__AROS__)
      char forbidden_char[] = {'/', '|', '?', '*', '<', '>', ':'};
#else
      char forbidden_char[] = {'/', '|', '?', '*', '<', '>'};
#endif
      int position;

      if (c < ' ')
        return 0;

      for (position=0; position<(long)sizeof(forbidden_char); position++)
        if (c == forbidden_char[position])
          return 0;
      return 1;
    }
    case INPUT_TYPE_HEXA:
      if ( (c>='0') && (c<='9') )
        return 1;
      else if ( (c>='A') && (c<='F') )
        return 1;
      else if ( (c>='a') && (c<='f') )
        return 1;
      break;
  } // End du "switch(input_type)"
  return 0;
}

//! remove invalid characters
static void Cleanup_string(char* str, int input_type)
{
  int i,j=0;

  for(i=0; str[i]!='\0'; i++)
  {
    if (Valid_character((unsigned char)(str[i]), input_type))
    {
      str[j]=str[i];
      j++;
    }
  }
  str[j] = '\0';
}

//! remove invalid characters
static void Cleanup_string_unicode(word* str, int input_type)
{
  int i,j=0;

  for(i=0; str[i]!=0; i++)
  {
    if (Valid_character(str[i], input_type))
    {
      str[j]=str[i];
      j++;
    }
  }
  str[j] = 0;
}

//! Prints the string and the cursor on screen
//! @param x_pos, y_pos position on screen
//! @param str the string to display
//! @param position the cursor position
static void Display_whole_string(word x_pos,word y_pos,const char * str,byte position)
{
  char cursor[2];
  Print_general(x_pos,y_pos,str,TEXT_COLOR,BACKGROUND_COLOR);

  cursor[0]=str[position] ? str[position] : ' ';
  cursor[1]='\0';
  Print_general(x_pos+(position<<3)*Menu_factor_X,y_pos,cursor,CURSOR_COLOR,CURSOR_BACKGROUND_COLOR);
}

//! Prints the unicode string and the cursor on screen
//! @param x_pos, y_pos position on screen
//! @param str_unicode the string to display
//! @param position the cursor position
static void Display_whole_string_unicode(word x_pos,word y_pos, const word * str_unicode,byte position)
{
  word cursor[2];
  Print_general_unicode(x_pos,y_pos,str_unicode,TEXT_COLOR,BACKGROUND_COLOR);

  cursor[0]=str_unicode[position] ? str_unicode[position] : ' ';
  cursor[1]=0;
  Print_general_unicode(x_pos+(position<<3)*Menu_factor_X,y_pos,cursor,CURSOR_COLOR,CURSOR_BACKGROUND_COLOR);
}

//! Initializes and displays the visual keyboard
void Init_virtual_keyboard(word y_pos, word keyboard_width, word keyboard_height)
{
  int h_pos;
  int v_pos;
  int parent_window_x=Window_pos_X+2;

  h_pos= Window_pos_X+(keyboard_width-Window_width)*Menu_factor_X/-2;
  if (h_pos<0)
    h_pos=0;
  else if (h_pos+keyboard_width*Menu_factor_X>Screen_width)
    h_pos=Screen_width-keyboard_width*Menu_factor_X;
  v_pos=Window_pos_Y+(y_pos+9)*Menu_factor_Y;
  if (v_pos+(keyboard_height*Menu_factor_Y)>Screen_height)
    v_pos=Window_pos_Y+(y_pos-keyboard_height-4)*Menu_factor_Y;

  Hide_cursor();
  Open_popup(h_pos,v_pos,keyboard_width,keyboard_height);
  Window_rectangle(1,0,Window_width-1, Window_height-1, MC_Light);
  Window_rectangle(0,0,1,Window_height-2, MC_White);
  // white border on top left angle, when it exceeds border.
  if (parent_window_x>Window_pos_X)
    Window_rectangle(0,0,(parent_window_x-Window_pos_X)/Menu_factor_X, 1, MC_White);
  Window_rectangle(2,Window_height-2,Window_width-2, 2, MC_Black);
  if(keyboard_width<320)
  {
    Window_rectangle(Window_width-2,2,2,Window_height-2, MC_Black);
  }
}


//! Get clipboard text content.
//! Inspired from http://www.libsdl.org/projects/scrap/
//! @param unicode NULL for pure ANSI working, or a pointer to get Unicode text data
//! that should be free()'d by the caller
//! @return a ANSI C string that should be free()'d by the caller
static char* getClipboard(word * * unicode)
{
#ifdef WIN32
    char* dst = NULL;
    if (OpenClipboard(GFX2_Get_Window_Handle()))
      {
        HANDLE hMem;
        if ( IsClipboardFormatAvailable(CF_TEXT) )
        {
          char *src;

          hMem = GetClipboardData(CF_TEXT);
          if ( hMem != NULL )
          {
            src = (char *)GlobalLock(hMem);
            dst = strdup(src);
            GlobalUnlock(hMem);
          }
        }
        if (unicode != NULL && IsClipboardFormatAvailable(CF_UNICODETEXT) )
        {
          word * src;
          hMem = GetClipboardData(CF_UNICODETEXT);
          if ( hMem != NULL )
          {
            src = (word *)GlobalLock(hMem);
            *unicode = Unicode_strdup(src);
            GlobalUnlock(hMem);
          }
        }
        CloseClipboard();
      }    
    return dst;
  #elif defined(__AROS__)

    struct IFFHandle *iff = NULL;
    struct ContextNode *cn;
    long error=0, unitnumber=0;
    char *dst = NULL;

    if (!(iff = AllocIFF ()))
    {
      goto bye;
    }

    if (!(iff->iff_Stream = (IPTR) OpenClipboard (unitnumber)))
    {
      goto bye;
    }

    InitIFFasClip (iff);

    if ((error = OpenIFF (iff, IFFF_READ)) != 0)
    {
      goto bye;
    }

    if ((error = StopChunk(iff, ID_FTXT, ID_CHRS)) != 0)
    {
      goto bye;
    }

    while(1)
    {
      error = ParseIFF(iff,IFFPARSE_SCAN);
      if (error) break; // we're reading only the 1st chunk

      cn = CurrentChunk(iff);

      if (cn && (cn->cn_Type == ID_FTXT) && (cn->cn_ID == ID_CHRS))
      {
        if ((dst = malloc(cn->cn_Size + 1)) != NULL)
        {
          dst[0] = '\0';
          if ((ReadChunkBytes(iff,dst,cn->cn_Size)) > 0)
          {
            dst[cn->cn_Size] = '\0';
          }
        }
      }
    }

bye:
    if (iff)
    {
      CloseIFF (iff);

      if (iff->iff_Stream)
        CloseClipboard ((struct ClipboardHandle *)iff->iff_Stream);
      FreeIFF (iff);
    }

    return dst;

  #elif defined __HAIKU__
  if (unicode)
    *unicode = NULL;
  return haiku_get_clipboard();
  #elif defined(USE_X11) || defined(__macosx__) || defined(USE_SDL2) || (defined(USE_SDL) && defined(SDL_VIDEO_DRIVER_X11) && !defined(NO_X11))
  if (unicode)
    *unicode = NULL;
    #if defined(USE_SDL2)
  if (!SDL_HasClipboardText())
  {
    return NULL;
  }
  else
  {
    char * utf8_str = SDL_GetClipboardText();
    if (utf8_str != NULL)
    {
    #elif defined(USE_X11) || (defined(USE_SDL) && defined(SDL_VIDEO_DRIVER_X11) && !defined(NO_X11))
  {
    int i;
    Atom selection;
    Window selection_owner;
#if defined(SDL_VIDEO_DRIVER_X11)
    Display * X11_display;
    Window X11_window;
    int old_wmevent_state;

    if (!GFX2_Get_X11_Display_Window(&X11_display, &X11_window))
    {
      GFX2_Log(GFX2_ERROR, "Failed to get X11 display and window\n");
      return NULL;
    }
    if (X11_display == NULL)
    {
      char video_driver_name[32];
      GFX2_Log(GFX2_WARNING, "X11 display is NULL. X11 is needed for Copy/Paste. SDL video driver is currently %s\n", SDL_VideoDriverName(video_driver_name, sizeof(video_driver_name)));
      return NULL;
    }
#endif
    selection = XInternAtom(X11_display, "CLIPBOARD", False);
    selection_owner = XGetSelectionOwner(X11_display, selection);

    if (selection_owner == None)
    {
      selection = XInternAtom(X11_display, "PRIMARY", False);
      selection_owner = XGetSelectionOwner(X11_display, selection);
    }
    if (selection_owner == None)
      return NULL;
#if defined(USE_SDL)
    old_wmevent_state = SDL_EventState(SDL_SYSWMEVENT, SDL_QUERY);
    SDL_EventState(SDL_SYSWMEVENT, SDL_ENABLE);
#endif

    XConvertSelection(X11_display, selection, XInternAtom(X11_display, "UTF8_STRING", False),
                      XInternAtom(X11_display, "GFX2_CLIP", False), /* Property */
                      X11_window, CurrentTime);
    // wait for the event to be received
    for(i = 0; X11_clipboard == NULL && i < 10; i++)
    {
      Get_input(20);
    }
#if defined(USE_SDL)
    SDL_EventState(SDL_SYSWMEVENT, old_wmevent_state);
#endif
    if (X11_clipboard != NULL)
    {
      char * utf8_str = X11_clipboard;
      X11_clipboard = NULL;
      X11_clipboard_size = 0;
  #else
  {
    // mac OS without X11
    const char * utf8_str = get_paste_board();
    if (utf8_str != NULL)
    {
  #endif
      // UTF8 -> UTF16 and UTF8 -> ANSI conversions
#if defined(ENABLE_FILENAMES_ICONV)
      if (unicode != NULL)
      {
        char * input = (char *)utf8_str;
        size_t inbytesleft = strlen(utf8_str);
        char * output;
        size_t outbytesleft;
        size_t r;
        *unicode = (word *)malloc(2 * inbytesleft + 2);
        if (*unicode != NULL)
        {
          output = (char *)*unicode;
          outbytesleft = 2 * inbytesleft;
          r = iconv(cd_utf16, &input, &inbytesleft, &output, &outbytesleft);
          if (r != (size_t)-1)
          {
            output[1] = output[0] = '\0';
          }
          else
          {
            Warning("Unicode conversion of clipboard text failed");
            free(*unicode);
            *unicode = NULL;
          }
        }
      }
      {
        char * ansi_str;
        char * input = (char *)utf8_str;
        size_t inbytesleft = strlen(utf8_str);
        char * output;
        size_t outbytesleft;
        size_t r;
        ansi_str = (char *)malloc(inbytesleft + 1);
        if (ansi_str != NULL)
        {
          output = ansi_str;
          outbytesleft = inbytesleft;
          r = iconv(cd, &input, &inbytesleft, &output, &outbytesleft);
          if (r != (size_t)-1)
          {
            *output = '\0';
#if defined(USE_X11)
            free(utf8_str);
#elif defined(USE_SDL2)
            SDL_free(utf8_str);
#endif
            return ansi_str;
          }
          else
          {
            Warning("ANSI conversion of clipboard text failed");
            free(ansi_str);
          }
        }
      }
#endif
      // we can get there if the charset conversions failed
      // return the uf8_string, that's better than nothing
#if defined(USE_X11)
      return utf8_str;
#elif defined(USE_SDL2)
      {
        char * return_str = strdup(utf8_str);
        SDL_free(utf8_str);
        return return_str;
      }
#else
      // mac OS without X11
      return strdup(utf8_str);
#endif
    }
  }
  return NULL;
  #else
  // Not implemented (no standard) on Linux systems. Maybe someday...
  if (unicode)
    *unicode = NULL;
  return NULL;
  #endif
}


/****************************************************************************
 *           Enhanced super scanf deluxe pro plus giga mieux :-)             *
 ****************************************************************************/
byte Readline(word x_pos, word y_pos, char * str, byte visible_size, enum INPUT_TYPE input_type)
// Paramètres:
//   x_pos, y_pos : Coordonnées de la saisie dans la fenêtre
//   str       : Chaîne recevant la saisie (et contenant éventuellement une valeur initiale)
//   max_size  : Nombre de caractères logeant dans la zone de saisie
//   input_type  : 0=Chaîne, 1=Nombre, 2=Nom de fichier
// Sortie:
//   0: Sortie par annulation (Esc.) / 1: sortie par acceptation (Return)
{
  byte max_size;
  // Grosse astuce pour les noms de fichiers: La taille affichée est différente
  // de la taille maximum gérée.
  if (input_type == INPUT_TYPE_FILENAME)
    max_size = 255;
  else
    max_size = visible_size;
  return Readline_ex(x_pos,y_pos,str,visible_size,max_size,input_type,0);
}

/****************************************************************************
*           Enhanced super scanf deluxe pro plus giga mieux :-)             *
****************************************************************************/
byte Readline_ex(word x_pos,word y_pos,char * str,byte visible_size,byte max_size,
                 enum INPUT_TYPE input_type, byte decimal_places)
{
  return Readline_ex_unicode(x_pos, y_pos, str, NULL, visible_size, max_size, input_type, decimal_places);
}

byte Readline_ex_unicode(word x_pos, word y_pos, char * str, word * str_unicode,
                         byte visible_size, byte max_size,
                         enum INPUT_TYPE input_type, byte decimal_places)
// Paramètres:
//   x_pos, y_pos : Coordonnées de la saisie dans la fenêtre
//   str       : Chaîne recevant la saisie (et contenant éventuellement une valeur initiale)
//   max_size  : Nombre de caractères logeant dans la zone de saisie
//   input_type  : 0=String, 1=Unsigned int, 2=Filename 3=Signed Double
//   decimal_places: Number of decimal places for a double
// Sortie:
//   0: Sortie par annulation (Esc.) / 1: sortie par acceptation (Return)
{
  char initial_string[256];
  char display_string[256];
  word initial_string_unicode[256];
  word display_string_unicode[256];
  byte position;
  size_t size;
  word input_char=0;
  word input_key=0;
  word window_x=Window_pos_X;
  word window_y=Window_pos_Y;
  byte offset=0; // index du premier caractère affiché
  
  // Virtual keyboard
  byte use_virtual_keyboard=0;
  static byte caps_lock=0;
  static const word keymapping[] =
  {
    KEY_CLEAR,KEY_BACKSPACE,KEY_RETURN,KEY_ESC,
    '0','1','2','3','4','5','6','7','8','9','.',',',
    'Q','W','E','R','T','Y','U','I','O','P',
    'A','S','D','F','G','H','J','K','L',
    KEY_CAPSLOCK,'Z','X','C','V','B','N','M',' ',
    '-','+','*','/','|','\\',
    '(',')','{','}','[',']',
    '_','=','<','>','%','@',
    ':',';','`','\'','"','~',
    '!','?','^','&','#','$'
  };

  // Si on a commencé à editer par un clic-droit, on vide la chaine.
  if (Mouse_K==RIGHT_SIDE)
    str[0]='\0';
  else if (input_type==INPUT_TYPE_INTEGER && str[0]!='\0')
    snprintf(str,10,"%d",atoi(str)); // On tasse la chaine à gauche
  else if (input_type==INPUT_TYPE_DECIMAL)
  {
    //  Nothing. The caller should have used Sprint_double, with min_positions
    //  at zero, so there's no spaces on the left and no useless 0s on the right.
  }
  else if (input_type==INPUT_TYPE_HEXA)
  {
    //  Nothing. The caller should have initialized a valid hexa number.
  }
  
#if defined(__ANDROID__)
	SDL_ANDROID_GetScreenKeyboardTextInput(str, max_size);
	input_key = KEY_RETURN;
#else
  // Virtual keyboards
  if (Config.Use_virtual_keyboard==1 ||
    (VIRT_KEY_DEFAULT_ON && Config.Use_virtual_keyboard==0))
  {
    if (input_type == INPUT_TYPE_STRING || input_type == INPUT_TYPE_FILENAME )
    {
      int x,y;
  
      Init_virtual_keyboard(y_pos, 320, 87);
      
      use_virtual_keyboard=1;
      
      // The order is important, see the array
      
      Window_set_normal_button(  7,67,43,15,"Clr", 0,1,KEY_NONE);
      Window_set_normal_button( 51,67,43,15,"Del", 0,1,KEY_NONE);
      Window_set_normal_button( 95,67,43,15,"OK",  0,1,KEY_NONE);
      Window_set_normal_button(139,67,43,15,"Esc", 0,1,KEY_NONE);
      Window_display_frame_in(5,65,179,19);
  
      Window_set_normal_button(193,63,17,19,"0", 0,1,KEY_NONE);
      Window_set_normal_button(193,43,17,19,"1", 0,1,KEY_NONE);
      Window_set_normal_button(211,43,17,19,"2", 0,1,KEY_NONE);
      Window_set_normal_button(229,43,17,19,"3", 0,1,KEY_NONE);
      Window_set_normal_button(193,23,17,19,"4", 0,1,KEY_NONE);
      Window_set_normal_button(211,23,17,19,"5", 0,1,KEY_NONE);
      Window_set_normal_button(229,23,17,19,"6", 0,1,KEY_NONE);
      Window_set_normal_button(193, 3,17,19,"7", 0,1,KEY_NONE);
      Window_set_normal_button(211, 3,17,19,"8", 0,1,KEY_NONE);
      Window_set_normal_button(229, 3,17,19,"9", 0,1,KEY_NONE);
      Window_set_normal_button(211,63,17,19,".", 0,1,KEY_NONE);
      Window_set_normal_button(229,63,17,19,",", 0,1,KEY_NONE);
   
      Window_set_normal_button(  3, 3,18,19,"Q", 0,1,KEY_NONE);
      Window_set_normal_button( 22, 3,18,19,"W", 0,1,KEY_NONE);
      Window_set_normal_button( 41, 3,18,19,"E", 0,1,KEY_NONE);
      Window_set_normal_button( 60, 3,18,19,"R", 0,1,KEY_NONE);
      Window_set_normal_button( 79, 3,18,19,"T", 0,1,KEY_NONE);
      Window_set_normal_button( 98, 3,18,19,"Y", 0,1,KEY_NONE);
      Window_set_normal_button(117, 3,18,19,"U", 0,1,KEY_NONE);
      Window_set_normal_button(136, 3,18,19,"I", 0,1,KEY_NONE);
      Window_set_normal_button(155, 3,18,19,"O", 0,1,KEY_NONE);
      Window_set_normal_button(174, 3,18,19,"P", 0,1,KEY_NONE);
  
      Window_set_normal_button( 12,23,18,19,"A", 0,1,KEY_NONE);
      Window_set_normal_button( 31,23,18,19,"S", 0,1,KEY_NONE);
      Window_set_normal_button( 50,23,18,19,"D", 0,1,KEY_NONE);
      Window_set_normal_button( 69,23,18,19,"F", 0,1,KEY_NONE);
      Window_set_normal_button( 88,23,18,19,"G", 0,1,KEY_NONE);
      Window_set_normal_button(107,23,18,19,"H", 0,1,KEY_NONE);
      Window_set_normal_button(126,23,18,19,"J", 0,1,KEY_NONE);
      Window_set_normal_button(145,23,18,19,"K", 0,1,KEY_NONE);
      Window_set_normal_button(164,23,18,19,"L", 0,1,KEY_NONE);
      
      Window_set_normal_button(  3,43,18,19,caps_lock?"\036":"\037", 0,1,KEY_NONE);
      Window_set_normal_button( 22,43,18,19,"Z", 0,1,KEY_NONE);
      Window_set_normal_button( 41,43,18,19,"X", 0,1,KEY_NONE);
      Window_set_normal_button( 60,43,18,19,"C", 0,1,KEY_NONE);
      Window_set_normal_button( 79,43,18,19,"V", 0,1,KEY_NONE);
      Window_set_normal_button( 98,43,18,19,"B", 0,1,KEY_NONE);
      Window_set_normal_button(117,43,18,19,"N", 0,1,KEY_NONE);
      Window_set_normal_button(136,43,18,19,"M", 0,1,KEY_NONE);
      Window_set_normal_button(155,43,18,19," ", 0,1,KEY_NONE);
  
      for (y=0; y<5; y++)
      {
        for (x=0; x<6; x++)
        {
          char label[2]=" ";
          label[0]=keymapping[x+y*6+44];        
          Window_set_normal_button(247+x*12, 3+y*16,11,15,label, 0,1,KEY_NONE);
        }
      }
  
      Update_window_area(0,0,Window_width, Window_height);
      Display_cursor();
    }
    else if (input_type == INPUT_TYPE_INTEGER || input_type == INPUT_TYPE_DECIMAL )
    {
      Init_virtual_keyboard(y_pos, 215, 47);
      
      use_virtual_keyboard=1;
      
      // The order is important, see the array
      
      Window_set_normal_button(  7,27,43,15,"Clr", 0,1,KEY_NONE);
      Window_set_normal_button( 51,27,43,15,"Del", 0,1,KEY_NONE);
      Window_set_normal_button( 95,27,43,15,"OK",  0,1,KEY_NONE);
      Window_set_normal_button(139,27,43,15,"Esc", 0,1,KEY_NONE);
      Window_display_frame_in(5,25,179,19);
  
      Window_set_normal_button(174, 3,18,19,"0", 0,1,KEY_NONE);
      Window_set_normal_button(  3, 3,18,19,"1", 0,1,KEY_NONE);
      Window_set_normal_button( 22, 3,18,19,"2", 0,1,KEY_NONE);
      Window_set_normal_button( 41, 3,18,19,"3", 0,1,KEY_NONE);
      Window_set_normal_button( 60, 3,18,19,"4", 0,1,KEY_NONE);
      Window_set_normal_button( 79, 3,18,19,"5", 0,1,KEY_NONE);
      Window_set_normal_button( 98, 3,18,19,"6", 0,1,KEY_NONE);
      Window_set_normal_button(117, 3,18,19,"7", 0,1,KEY_NONE);
      Window_set_normal_button(136, 3,18,19,"8", 0,1,KEY_NONE);
      Window_set_normal_button(155, 3,18,19,"9", 0,1,KEY_NONE);
      Window_set_normal_button(193, 3,18,19,".", 0,1,KEY_NONE);
  
      Update_window_area(0,0,Window_width, Window_height);
      Display_cursor();
    }
  }
#ifdef GCWZERO //we cannot enter text into a field without using the virtual mouse otherwise so no saving etc
  Keyboard_click_allowed = 1;
#else
  Keyboard_click_allowed = 0;
#endif
  Hide_cursor();

  // Effacement de la chaîne
  Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
  Update_window_area(x_pos,y_pos,visible_size<<3,8);

  // Mise à jour des variables se rapportant à la chaîne en fonction de la chaîne initiale
  strcpy(initial_string,str);
  if (str_unicode != NULL)
  {
    size = Unicode_strlen(str_unicode);
    if (size > 255) size = 255;
    memcpy(initial_string_unicode, str_unicode, 2*(size+1));
    position  =(byte)((size<max_size) ? size : size-1);
    if (position-offset>=visible_size)
      offset=position-visible_size+1;
    // copy only part of the string if it is too long
    Unicode_strlcpy(display_string_unicode, str_unicode+offset, visible_size);
    if (offset>0)
      display_string_unicode[0] = (byte)LEFT_TRIANGLE_CHARACTER;
    if ((size_t)visible_size + offset + 1 < size )
      display_string_unicode[visible_size-1] = (byte)RIGHT_TRIANGLE_CHARACTER;

    Display_whole_string_unicode(window_x+(x_pos*Menu_factor_X),window_y+(y_pos*Menu_factor_Y),display_string_unicode,position - offset);
  }
  else
  {
    size=strlen(str);
    if (size > 255) size = 255;
    position = (byte)((size<max_size) ? size : size-1);
    if (position-offset>=visible_size)
      offset=position-visible_size+1;
    // copy only part of the string if it is too long
    strncpy(display_string, str + offset, visible_size);
    display_string[visible_size]='\0';
    if (offset>0)
      display_string[0]=LEFT_TRIANGLE_CHARACTER;
    if ((size_t)visible_size + offset + 1 < size )
      display_string[visible_size-1]=RIGHT_TRIANGLE_CHARACTER;
  
    Display_whole_string(window_x+(x_pos*Menu_factor_X),window_y+(y_pos*Menu_factor_Y),display_string,position - offset);
  }
  Update_window_area(x_pos,y_pos,visible_size<<3,8);
  Flush_update();
  if (Mouse_K)
  {
    Display_cursor();
    Wait_end_of_click();
    Hide_cursor();
  }

  while ((input_key!=KEY_RETURN) && (input_key!=KEY_ESC))
  {
    Display_cursor();
    if (use_virtual_keyboard)
    {
      int clicked_button;

      clicked_button=Window_clicked_button();
      input_char=0;

      if (clicked_button==-1)
        input_key=KEY_RETURN;
      else if (clicked_button>0)
      {
        input_key=keymapping[clicked_button-1];
        if (input_key==KEY_CAPSLOCK)
        {
          // toggle uppercase
          caps_lock=!caps_lock;
          Hide_cursor();
          Print_in_window(8, 49,caps_lock?"\036":"\037", MC_Black,MC_Light);
          Display_cursor();
        }
        else if (input_key==KEY_BACKSPACE)
        {
          // A little hack: the button for backspace will:
          // - backspace if the cursor is at end of string
          // - delete otherwise
          // It's needed for those input boxes that are completely full.
          if (position<size)
            input_key = KEY_DELETE;
        }
        else if (input_key>='A' && input_key<='Z' && !caps_lock)
        {
          input_char = input_key + 'a' - 'A';
        }
        else if (input_key >= ' ')  // this is a printable char
        {
          input_char = input_key;
        }
      }
    }
    else
    {
      do
      {
        Get_input(20);
        input_char = (str_unicode == NULL) ? Key_ANSI : Key_UNICODE;
        input_key = Key;
        if (Mouse_K)
          input_key=KEY_RETURN;

        // Handle paste request on CTRL+v
        if (input_key == SHORTCUT_PASTE)
        {
          int nb_added = 0;
          if (str_unicode != NULL)
          {
            word * data_unicode = NULL;
            char * data = getClipboard(&data_unicode);
            if (data_unicode != NULL)
            {
              // ignore ANSI data, use Unicode
              Cleanup_string_unicode(data_unicode, input_type);
              nb_added = Prepend_string_unicode(str_unicode + position, data_unicode, max_size - position);
              free(data_unicode);
            }
            else
            {
              word tmp_unicode[256];
              if (data == NULL)
                continue;
              Cleanup_string(data, input_type);
              Unicode_char_strlcpy(tmp_unicode, data, sizeof(tmp_unicode)/sizeof(word)); // convert ANSI to unicode
              nb_added = Prepend_string_unicode(str_unicode + position, tmp_unicode, max_size - position);
            }
            free(data);
          }
          else
          {
            char* data = getClipboard(NULL);
            if (data == NULL)
              continue; // No clipboard data
            Cleanup_string(data, input_type);
            // Insert it at the cursor position
            nb_added = Prepend_string(str + position, data, max_size - position);
            free(data);
          }
          while (nb_added > 0)
          {
            size++;
            if (size<max_size)
            {
              position++;
              if (str_unicode != NULL)
              {
                if (display_string_unicode[position-offset]==(byte)RIGHT_TRIANGLE_CHARACTER || position-offset>=visible_size)
                  offset++;
              }
              else
              {
                if (display_string[position-offset]==RIGHT_TRIANGLE_CHARACTER || position-offset>=visible_size)
                  offset++;
              }
            }
            nb_added--;
          }
          Hide_cursor();
          goto affichage;
        }
        
      } while(input_char==0 && input_key == 0
#if defined(USE_SDL2)
              && Key_Text[0] == '\0'
#endif
              );
    }
    Hide_cursor();

#if defined(USE_SDL2)
    if (Key_Text[0] != 0)
    {
      word unicode_text[32];
      int i;
#if defined(ENABLE_FILENAMES_ICONV)
      char * input = Key_Text;
      size_t inbytesleft = strlen(Key_Text);
      char * output = (char *)unicode_text;
      size_t outbytesleft = sizeof(unicode_text) - 2;
      size_t r = iconv(cd_utf16, &input, &inbytesleft, &output, &outbytesleft);
      if (r != (size_t)-1)
      {
        output[1] = output[0] = '\0';
      }
      else
      {
        Warning("Unicode conversion of input text failed");
        unicode_text[0] = 0;
      }
#else
      int j;
      for (i = 0, j = 0; i < sizeof(Key_Text) && Key_Text[i] != '\0'; i++)
        if (Key_Text[i] < 128) unicode_text[j++] = Key_Text[i];
      unicode_text[j++] = 0;
#endif
      for (i = 0; unicode_text[i] != 0 && size < max_size; i++)
      {
        // Si la touche était autorisée...
        byte is_authorized = Valid_character(unicode_text[i], input_type);
        if (is_authorized == 1 || (is_authorized == 2 && position == 0 && str[position] != '-'))
        {
          // ... alors on l'insère ...
          if (str_unicode != NULL)
            Insert_character_unicode(str_unicode,unicode_text[i],position/*,size*/);
          else
            Insert_character(str,unicode_text[i],position/*,size*/);
          // ce qui augmente la taille de la chaine
          size++;
          // et qui risque de déplacer le curseur vers la droite
          if (size<max_size)
          {
            position++;
            if (position-offset>=visible_size)
              offset++;
            else if (str_unicode != NULL)
            {
              if (display_string_unicode[position-offset]==RIGHT_TRIANGLE_CHARACTER)
                offset++;
            }
            else
            {
              if (display_string[position-offset]==RIGHT_TRIANGLE_CHARACTER)
                offset++;
            }
          }
        }
      }
      // Enfin, on raffiche la chaine
      goto affichage;
    }
    else
#endif
    switch (input_key)
    {
      case KEY_DELETE : // Suppr.
            if (position<size)
            {
              if (str_unicode != NULL)
                Remove_character_unicode(str_unicode,position);
              else
                Remove_character(str,position);
              size--;
              
              // Effacement de la chaîne
              Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
              goto affichage;
            }
      break;
      case KEY_LEFT : // Gauche
            if (position>0)
            {
              // Effacement de la chaîne
              if (position==size)
                Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
              position--;
              if (offset > 0 && (position == 0 || position < (offset + 1)))
                offset--;
              goto affichage;
            }
      break;
      case KEY_RIGHT : // Droite
            if ((position<size) && (position<max_size-1))
            {
              position++;
              //if (position > visible_size + offset - 2)
              //if (offset + visible_size < max_size && (position == size || (position > visible_size + offset - 2)))
              if (str_unicode != NULL)
              {
                if (display_string_unicode[position-offset]==(byte)RIGHT_TRIANGLE_CHARACTER || position-offset>=visible_size)
                  offset++;
              }
              else
              {
                if (display_string[position-offset]==RIGHT_TRIANGLE_CHARACTER || position-offset>=visible_size)
                  offset++;
              }
              goto affichage;
            }
      break;
      case KEY_HOME : // Home
            if (position)
            {
              // Effacement de la chaîne
              if (position==size)
                Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
              position = 0;
              offset = 0;
              goto affichage;
            }
      break;
      case KEY_END : // End
            if ((position<size) && (position<max_size-1))
            {
              position = (byte)((size<max_size) ? size : size-1);
              if (position-offset>=visible_size)
                offset=position-visible_size+1;
              goto affichage;
            }
      break;
      case  KEY_BACKSPACE : // Backspace : combinaison de gauche + suppr

        if (position > 0)
        {       
          position--;
          if (offset > 0 && (position == 0 || position < (offset + 1)))
            offset--;
          if (str_unicode != NULL)
            Remove_character_unicode(str_unicode,position);
          else
            Remove_character(str,position);
          size--;
          // Effacement de la chaîne
          Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
          goto affichage;
        }
        break;
      case  KEY_CLEAR : // Clear
        str[0]='\0';
        if (str_unicode != NULL)
          str_unicode[0] = 0;
        position=offset=0;
        // Effacement de la chaîne
        Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
        goto affichage;
      case KEY_RETURN :
        break;
        
      case KEY_ESC :
        // On restaure la chaine initiale
        strcpy(str,initial_string);
        size=strlen(str);
        if (size > 255) size = 255;
        if (str_unicode != NULL)
        {
          Unicode_strlcpy(str_unicode, initial_string_unicode, 256);
          size = Unicode_strlen(str_unicode);
        }
        break;
      default :
#if !defined(USE_SDL2)
        if (size<max_size && input_char != 0)
        {
          // Si la touche était autorisée...
          byte is_authorized = Valid_character(input_char, input_type);
          if (is_authorized == 1 || (is_authorized == 2 && position == 0 && str[position] != '-'))
          {
            // ... alors on l'insère ...
            if (str_unicode != NULL)
              Insert_character_unicode(str_unicode,input_char,position/*,size*/);
            else
              Insert_character(str,input_char,position/*,size*/);
            // ce qui augmente la taille de la chaine
            size++;
            // et qui risque de déplacer le curseur vers la droite
            if (size<max_size)
            {
              position++;
              if (position-offset>=visible_size)
                offset++;
              else if (str_unicode != NULL)
              {
                if (display_string_unicode[position-offset]==RIGHT_TRIANGLE_CHARACTER)
                  offset++;
              }
              else
              {
                if (display_string[position-offset]==RIGHT_TRIANGLE_CHARACTER)
                  offset++;
              }
            }
            // Enfin, on raffiche la chaine
            goto affichage;
          } // End du test d'autorisation de touche
        } // End du test de place libre
#endif
        break;
      
affichage:
        if (str_unicode != NULL)
        {
          size=Unicode_strlen(str_unicode);
          if (size > 255) size = 255;
          // only show part of the string if too long
          Unicode_strlcpy(display_string_unicode, str_unicode + offset, visible_size);
          if (offset>0)
            display_string_unicode[0] = (byte)LEFT_TRIANGLE_CHARACTER;
          if ((size_t)visible_size + offset + 0 < size )
            display_string_unicode[visible_size-1] = (byte)RIGHT_TRIANGLE_CHARACTER;

          Display_whole_string_unicode(window_x+(x_pos*Menu_factor_X),window_y+(y_pos*Menu_factor_Y),display_string_unicode,position - offset);
        }
        else
        {
          size=strlen(str);
          if (size > 255) size = 255;
          // only show part of the string if too long
          strncpy(display_string, str + offset, visible_size);
          display_string[visible_size]='\0';
          if (offset>0)
            display_string[0]=LEFT_TRIANGLE_CHARACTER;
          if ((size_t)visible_size + offset + 0 < size )
            display_string[visible_size-1]=RIGHT_TRIANGLE_CHARACTER;

          Display_whole_string(window_x+(x_pos*Menu_factor_X),window_y+(y_pos*Menu_factor_Y),display_string,position - offset);
        }
        Update_rect(window_x+(x_pos*Menu_factor_X),window_y+(y_pos*Menu_factor_Y),
        visible_size*(Menu_factor_X<<3),(Menu_factor_Y<<3));
    } // End du "switch(input_key)"
    Flush_update();

  } // End du "while"
  Keyboard_click_allowed = 1;
  if (use_virtual_keyboard)
  {
    byte old_mouse_k = Mouse_K;
    Close_popup();
    Mouse_K=old_mouse_k;
    Input_sticky_control=0;
  }
#endif // defined(__ANDROID__)  
  // Effacement de la chaîne
  Window_rectangle(x_pos,y_pos,visible_size<<3,8,BACKGROUND_COLOR);
  // On raffiche la chaine correctement
  if (input_type==INPUT_TYPE_INTEGER)
  {
    if (str[0]=='\0')
    {
      strcpy(str,"0");
      size=1;
    }
    Print_in_window(x_pos+(((short)max_size-(short)size)<<3),y_pos,str,TEXT_COLOR,BACKGROUND_COLOR);
  }
  else if (input_type==INPUT_TYPE_DECIMAL)
  {
    double value;
    // Discard extra digits
    value = Fround(atof(str), decimal_places);
    Sprint_double(str,value,decimal_places,visible_size);
    // Recompute updated size
    size = strlen(str);
    if (size > 255) size = 255;
    
    if (size<=visible_size)
      Print_in_window(x_pos+(((short)visible_size-(short)size)<<3),y_pos,str,TEXT_COLOR,BACKGROUND_COLOR);
    else
      Print_in_window_limited(x_pos,y_pos,str,visible_size,TEXT_COLOR,BACKGROUND_COLOR);
  }
  else
  {
    Print_in_window_limited(x_pos,y_pos,str,visible_size,TEXT_COLOR,BACKGROUND_COLOR);
  }
  Update_window_area(x_pos,y_pos,visible_size<<3,8);
  
  return (input_key==KEY_RETURN);
}

void Sprint_double(char *str, double value, byte decimal_places, byte min_positions)
{
  int i;
  int length;
  
  sprintf(str,"%.*f",decimal_places, value);
  length=strlen(str);

  for (i=0; i<length; i++)
  {
    if (str[i]=='.')
    {
      // Remove extraneous zeroes
      char * decimals = str+i+1;
      int j;
      
      for (j=strlen(decimals)-1; j >= 0 && decimals[j]=='0'; j--)
      {
          decimals[j] = '\0';
      }
      // If all decimals were removed, remove the dot too
      if (str[i+1]=='\0')
        str[i]='\0';
      
      // Update string length
      length=strlen(str);
      
      // Ends the parent loop
      break; 
    }
  }
  
  // Now try add spaces at beginning
  if (length<min_positions)
  {
    int offset = min_positions - length;
    
    // Move the string to the right
    for (i=0; i<=length; i++)
    {
      str[length+offset-i] = str[length-i];
    }
    // Replace the N first characters by spaces
    for (i=0; i<offset; i++)
    {
      str[i] = ' ';
    }
  }
}
