//
//
// UTF-8 test program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//

#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Scroll.H>
#include <FL/Fl_Choice.H>
#include <FL/Fl_Input.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Hold_Browser.H>
#include <FL/Fl_Value_Output.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Check_Button.H>
#include <FL/Fl_Output.H>
#include <FL/fl_draw.H>
#include <FL/fl_utf8.h>

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

//
// Font chooser widget for the Fast Light Tool Kit(FLTK).
//

/********************************************************************************************/
#define DEF_SIZE 16 // default value for the font size picker

/********************************************************************************************/
static Fl_Double_Window *fnt_chooser_win;
static Fl_Hold_Browser *fontobj;
static Fl_Hold_Browser *sizeobj;

static Fl_Value_Output *fnt_cnt;
static Fl_Button *refresh_btn;
static Fl_Button *choose_btn;
static Fl_Output *fix_prop;
static Fl_Check_Button *own_face;

static int  **sizes = NULL;
static int  *numsizes = NULL;
static int  pickedsize = DEF_SIZE;
static char label[1000];

static Fl_Double_Window *main_win;
static Fl_Scroll *thescroll;
static Fl_Font extra_font;

static int font_count = 0;
static int first_free = 0;

/********************************************************************************************/
class FontDisplay : public Fl_Widget
{
	void draw(void);

public:
	int  font, size;

	int test_fixed_pitch(void);

	FontDisplay(Fl_Boxtype B, int X, int Y, int W, int H, const char *L = 0) : Fl_Widget(X, Y, W, H, L)
	{
		box(B);
		font = 0;
		size = DEF_SIZE;
	}
};

/********************************************************************************************/
void FontDisplay::draw(void)
{
	draw_box();
	fl_font((Fl_Font)font, size);
	fl_color(FL_BLACK);
	fl_draw(label(), x() + 3, y() + 3, w() - 6, h() - 6, align());
}
/********************************************************************************************/
int FontDisplay::test_fixed_pitch(void)
{
	int w1, w2;
	int h1, h2;

	w1 = w2 = 0;
	h1 = h2 = 0;

	fl_font((Fl_Font)font, size);

	fl_measure("MHMHWWMHMHMHM###WWX__--HUW", w1, h1, 0);
	fl_measure("iiiiiiiiiiiiiiiiiiiiiiiiii", w2, h2, 0);

	if (w1 == w2) return 1; // exact match - fixed pitch

	// Is the font "nearly" fixed pitch? If it is within 5%, say it is...
	double f1 = (double)w1;
	double f2 = (double)w2;
	double delta = fabs(f1 - f2) * 5.0;
	if (delta <= f1) return 2; // nearly fixed pitch...

	return 0; // NOT fixed pitch
}

/********************************************************************************************/
static FontDisplay *textobj;

/********************************************************************************************/
static void size_cb(Fl_Widget *, long)
{
	int size_idx = sizeobj->value();

	if (!size_idx) return;

	const char *c = sizeobj->text(size_idx);

	while (*c < '0' || *c > '9') c++; // find the first numeric char
	pickedsize = atoi(c);             // convert the number string to a value

	// Now set the font view to the selected size and redraw it.
	textobj->size = pickedsize;
	textobj->redraw();
}
/********************************************************************************************/
static void font_cb(Fl_Widget *, long)
{
	int font_idx = fontobj->value() + first_free;

	if (!font_idx) return;
	font_idx--;

	textobj->font = font_idx;
	sizeobj->clear();

	int  size_count = numsizes[font_idx-first_free];
	int *size_array = sizes[font_idx-first_free];
	if (!size_count)
	{
		// no preferred sizes - probably TT fonts etc...
	}
	else if (size_array[0] == 0)
	{
		// many sizes, probably a scaleable font with preferred sizes
		int j = 1;
		for (int i = 1; i <= 64 || i < size_array[size_count - 1]; i++)
		{
			char buf[16];
			if (j < size_count && i == size_array[j])
			{
				sprintf(buf, "@b%d", i);
				j++;
			}
			else
				sprintf(buf, "%d", i);
			sizeobj->add(buf);
		}
		sizeobj->value(pickedsize);
	}
	else
	{
		// some sizes, probably a font with a few fixed sizes available
		int w = 0;
		for (int i = 0; i < size_count; i++)
		{
			// find the nearest available size to the current picked size
			if (size_array[i] <= pickedsize) w = i;

			char buf[16];
			sprintf(buf, "@b%d", size_array[i]);
			sizeobj->add(buf);
		}
		sizeobj->value(w + 1);
	}
	size_cb(sizeobj, 0); // force selection of nearest valid size, then redraw

	// Now check to see if the font looks like a fixed pitch font or not...
	int looks_fixed = textobj->test_fixed_pitch();
	if(looks_fixed)
	{
		if (looks_fixed > 1)
			fix_prop->value("near");
		else
			fix_prop->value("fixed");
	}
	else
	{
		fix_prop->value("prop");
	}
}

/********************************************************************************************/
static void choose_cb(Fl_Widget *, long)
{
	int font_idx = fontobj->value() + first_free;
	if (!font_idx)
	{
		puts("No font chosen");
	}
	else
	{
		int font_type;
		font_idx -= 1;
		const char *name = Fl::get_font_name((Fl_Font)font_idx, &font_type);
		printf("idx %d\nUser name :%s:\n", font_idx, name);
		printf("FLTK name :%s:\n", Fl::get_font((Fl_Font)font_idx));

		Fl::set_font(extra_font, (Fl_Font)font_idx);
//		Fl::set_font(extra_font, Fl::get_font((Fl_Font)font_idx));
	}

	int size_idx = sizeobj->value();
	if (!size_idx)
	{
		puts("No size selected");
	}
	else
	{
		const char *c = sizeobj->text(size_idx);
		while (*c < '0' || *c > '9') c++; // find the first numeric char
		int pickedsize = atoi(c);         // convert the number string to a value

		printf("size %d\n\n", pickedsize);
	}

	fflush(stdout);
	main_win->redraw();
}
/********************************************************************************************/
static void refresh_cb(Fl_Widget *, long)
{
	main_win->redraw();
}

/********************************************************************************************/
static void own_face_cb(Fl_Widget *, void *)
{
	int font_idx;
	int cursor_restore = 0;
	static int i_was = -1; // used to keep track of where we were in the list...

	if (i_was < 0) { // not been here before
		i_was = 1;
	} else {
		i_was = fontobj->topline(); // record which was the topmost visible line
		fontobj->clear();
		// Populating the font widget can be slower than an old dog with three legs 
		// on a bad day, show a wait cursor
		fnt_chooser_win->cursor(FL_CURSOR_WAIT);
		cursor_restore = 1;
	}


	// Populate the font list with the names of the fonts found
	for (font_idx = first_free; font_idx < font_count; font_idx++)
	{
		int font_type;
		const char *name = Fl::get_font_name((Fl_Font)font_idx, &font_type);
		char buffer[128];

		if(own_face->value() == 0) {
			char *p = buffer;
			if (font_type & FL_BOLD) { // if the font is BOLD, set the bold attribute in the list
				*p++ = '@';
				*p++ = 'b';
			}
			if (font_type & FL_ITALIC) { //  ditto for italic fonts
				*p++ = '@';
				*p++ = 'i';
			}
			// Suppress subsequent formatting - some MS fonts have '@' in their name
			*p++ = '@';
			*p++ = '.';
			strcpy(p, name);
		} else { // Show font in its own face
			/* this is neat, but really slow on some systems: uses each font to display its own name */
			sprintf (buffer, "@F%d@.%s", font_idx, name);
		}
		fontobj->add(buffer);
	}
	// now put the browser position back the way it was... more or less
	fontobj->topline(i_was);
	// restore the cursor
	if(cursor_restore) fnt_chooser_win->cursor(FL_CURSOR_DEFAULT);
}

/********************************************************************************************/
static void create_font_widget()
{
	fnt_chooser_win = new Fl_Double_Window(380, 420, "Font Selector");

	strcpy(label, "Font Sample\n");
	int i = 12; // strlen(label);
	int n = 0;
	ulong c;
	for (c = ' '+1; c < 127; c++) {
		if (!(c&0x1f)) label[i++]='\n';
		if (c=='@') label[i++]=c;
		label[i++]=c;
	}
	label[i++] = '\n';
	for (c = 0xA1; c < 0x600; c += 9) {if (!(++n&(0x1f))) label[i++]='\n';
						  i += fl_utf8encode((unsigned int)c, label + i);}
	label[i] = 0;

	textobj = new FontDisplay(FL_FRAME_BOX, 10, 10, 360, 90, label);
	textobj->align(FL_ALIGN_TOP | FL_ALIGN_LEFT | FL_ALIGN_INSIDE | FL_ALIGN_CLIP);
	textobj->color(53, 3);

	fontobj = new Fl_Hold_Browser(10, 110, 290, 270);
	fontobj->box(FL_FRAME_BOX);
	fontobj->color(53, 3);
	fontobj->callback(font_cb);
	fnt_chooser_win->resizable(fontobj);

	sizeobj = new Fl_Hold_Browser(310, 110, 60, 270);
	sizeobj->box(FL_FRAME_BOX);
	sizeobj->color(53, 3);
	sizeobj->callback(size_cb);

// Create the status bar
	Fl_Group * stat_bar = new Fl_Group (10, 385, 380, 30);
	stat_bar->begin();

	fnt_cnt = new Fl_Value_Output(10, 390, 40, 20);
	fnt_cnt->label("fonts");
	fnt_cnt->align(FL_ALIGN_RIGHT);

 	fix_prop = new Fl_Output(100, 390, 40, 20);
	fix_prop->color(FL_BACKGROUND_COLOR);
	fix_prop->value("prop");
	fix_prop->clear_visible_focus();

	own_face = new Fl_Check_Button(150, 390, 40, 20, "Self");
	own_face->value(0);
	own_face->type(FL_TOGGLE_BUTTON);
	own_face->clear_visible_focus();
	own_face->callback(own_face_cb);
	own_face->tooltip("Display font names in their own face");

	Fl_Box * dummy = new Fl_Box(220, 390, 1, 1);

	choose_btn = new Fl_Button(240, 385, 60, 30);
	choose_btn->label("Select");
	choose_btn->callback(choose_cb);

	refresh_btn = new Fl_Button(310, 385, 60, 30);
	refresh_btn->label("Refresh");
	refresh_btn->callback(refresh_cb);

	stat_bar->end();
	stat_bar->resizable (dummy);

	fnt_chooser_win->end();
}

/********************************************************************************************/
int make_font_chooser(void)
{
	int font_idx;

	// create the widget frame
	create_font_widget();

	// Load the systems available fonts - ask for everything
//	font_count = Fl::set_fonts("*");
#ifdef WIN32
	font_count = Fl::set_fonts("*");
#elif __APPLE__
	font_count = Fl::set_fonts("*");
#else
	// Load the systems available fonts - ask for everything that claims to be iso10646 compatible
    font_count = Fl::set_fonts("-*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1");
#endif
	
	// allocate space for the sizes and numsizes array, now we know how many entries it needs
	sizes = new int*[font_count];
	numsizes = new int[font_count];

	// Populate the font list with the names of the fonts found
	first_free = FL_FREE_FONT;
	for (font_idx = first_free; font_idx < font_count; font_idx++)
	{
		// Find out how many sizes are supported for each font face
		int *size_array;
		int size_count = Fl::get_font_sizes((Fl_Font)font_idx, size_array);
		numsizes[font_idx-first_free] = size_count;
		if (size_count) // if the font has multiple sizes, populate the 2-D sizes array
		{
			sizes[font_idx-first_free] = new int[size_count];
			for (int j = 0; j < size_count; j++)
				sizes[font_idx-first_free][j] = size_array[j];
		}
	} // end of font list filling loop

	// Call this once to get the font browser loaded up
	own_face_cb(NULL, 0);

	fontobj->value(1);
//	fontobj->textfont(261); // optional hard-coded font for testing - do not use!

	font_cb(fontobj, 0);

	fnt_cnt->value(font_count);

	return font_count;

} // make_font_chooser

/* End of Font Chooser Widget code */
/********************************************************************************************/
/* Unicode Font display widget */

void box_cb(Fl_Widget* o, void*) {
  thescroll->box(((Fl_Button*)o)->value() ? FL_DOWN_FRAME : FL_NO_BOX);
  thescroll->redraw();
}

class right_left_input : public Fl_Input
{
public:
	right_left_input (int x, int y, int w, int h) : Fl_Input(x, y, w, h) {};
	void draw() {
		if (type() == FL_HIDDEN_INPUT) return;
		 Fl_Boxtype b = box();
		if (damage() & FL_DAMAGE_ALL) draw_box(b, color());
		drawtext(x()+Fl::box_dx(b)+3, y()+Fl::box_dy(b),
			w()-Fl::box_dw(b)-6, h()-Fl::box_dh(b));
	}
	void drawtext(int X, int Y, int W, int H) {
		fl_color(textcolor());
		fl_font(textfont(), textsize());
		fl_rtl_draw(value(), strlen(value()),
			X + W, Y + fl_height() -fl_descent());
	}
};


void i7_cb(Fl_Widget *w, void *d)
{
  int i = 0;
  char nb[] = "01234567";
  Fl_Input *i7 = (Fl_Input*)w;
  Fl_Input *i8 = (Fl_Input*)d;
  static char buf[1024];
  const char *ptr = i7->value();
  while (ptr && *ptr) {
     if (*ptr < ' ' || *ptr > 126) {
       buf[i++] = '\\';
       buf[i++] = nb[((*ptr >> 6) & 0x3)];
       buf[i++] = nb[((*ptr >> 3) & 0x7)];
       buf[i++] = nb[(*ptr & 0x7)];
     } else {
       if (*ptr == '\\') buf[i++] = '\\';
       buf[i++] = *ptr;
     }
     ptr++;
  }
  buf[i] = 0;
  i8->value(buf);
}

class UCharDropBox : public Fl_Output {
public:
  UCharDropBox(int x, int y, int w, int h, const char *label=0) :
    Fl_Output(x, y, w, h, label) { }
  int handle(int event) {
    switch (event) {
      case FL_DND_ENTER: return 1;
      case FL_DND_DRAG: return 1;
      case FL_DND_RELEASE: return 1;
      case FL_PASTE:
        {
          static const char lut[] = "0123456789abcdef";
          const char *t = Fl::event_text();
          int i, n;
          unsigned int ucode = fl_utf8decode(t, t+Fl::event_length(), &n);
          if (n==0) {
            value("");
            return 1;
          }
          char buffer[200], *d = buffer;
          for (i=0; i<n; i++) *d++ = t[i];
          *d++ = ' ';
          for (i=0; i<n; i++) {
            *d++ = '\\'; *d++ = 'x';
            *d++ = lut[(t[i]>>4)&0x0f]; *d++ = lut[t[i]&0x0f];
          }
          *d++ = ' ';
          *d++ = '0';
          *d++ = 'x';
          *d++ = lut[(ucode>>20)&0x0f]; *d++ = lut[(ucode>>16)&0x0f];
          *d++ = lut[(ucode>>12)&0x0f]; *d++ = lut[(ucode>>8)&0x0f];
          *d++ = lut[(ucode>>4)&0x0f]; *d++ = lut[ucode&0x0f];
          *d++ = 0;
          value(buffer);
        }
        return 1;
    }
    return Fl_Output::handle(event);
  }
};

/********************************************************************************************/
int main(int argc, char** argv)
{
	int l;
/* If this file is saved as a UTF-8, the latin1 text in the comment 
 * below doesn't look right any more! 
 * Store the specific latin-1 byte values here... this should be equivalent to:
 *	char *latin1 = "ABCabcàèéïâîöüã123"; */
	const char *latin1 = "\x41\x42\x43\x61\x62\x63\xe0\xe8\xe9\xef\xe2\xee\xf6\xfc\xe3\x31\x32\x33";
	char *utf8 = (char*) malloc(strlen(latin1) * 5 + 1);
	l = 0;
//	l = fl_latin12utf((const unsigned char*)latin1, strlen(latin1), utf8);
	l = fl_utf8froma(utf8, (strlen(latin1) * 5 + 1), latin1, strlen(latin1));

	make_font_chooser();
	extra_font = FL_TIMES_BOLD_ITALIC;

  /* setup the extra font */
  Fl::set_font(extra_font,
#ifdef WIN32
	" Arial Unicode MS"
#elif __APPLE__
	"Monaco"
#else
	"-*-*-*-*-*-*-*-*-*-*-*-*-iso10646-1"
#endif
  );

	main_win = new Fl_Double_Window (200 + 5*75, 400, "Unicode Display Test");
	main_win->begin();

	Fl_Input i1(5, 5, 190, 25);
	utf8[l] = '\0';
	i1.value(utf8);
	Fl_Scroll scroll(200,0,5 * 75,400);

  int off = 2;
  if (argc > 1) {
	off = (int)strtoul(argv[1], NULL, 0);
	off /= 16;
  }
  argc = 1;
  for (long y=off; y< 0x10000 / 16; y++) {
    int o = 0;
    char bu[25];
    char buf[16*6];
    int i = 16 * y;
    for (int x=0; x<16; x++) {
	  int l;
	  l = fl_utf8encode(i, buf + o);
	  if (l < 1) l = 1;
	  o += l;
	  i++;
    }
    buf[o] = '\0';
    sprintf(bu, "0x%04lX", y * 16);
    Fl_Input* b = new Fl_Input(200,(y-off)*25,60,25);
    b->value(strdup(bu));
    b = new Fl_Input(260,(y-off)*25,400,25);
    b->textfont(extra_font);
    b->value(strdup(buf));
  }
  main_win->resizable(scroll);
  scroll.end();

  thescroll = &scroll;

  char *utf8l = (char*) malloc(strlen(utf8) * 3 + 1);
  Fl_Input i2(5, 35, 190, 25);
  l = fl_utf_tolower((const unsigned char*)utf8, l, utf8l);
  utf8l[l] = '\0';
  i2.value(utf8l);

  char *utf8u = (char*) malloc(strlen(utf8l) * 3 + 1);
  Fl_Input i3(5, 65, 190, 25);
  l = fl_utf_toupper((const unsigned char*)utf8l, l, utf8u);
  utf8u[l] = '\0';
  i3.value(utf8u);

  const char *ltr_txt = "\\->e\xCC\x82=\xC3\xAA";
  Fl_Input i4(5, 90, 190, 25);
  i4.value(ltr_txt);
  i4.textfont(extra_font);

  wchar_t r_to_l_txt[] ={/*8238,*/ 1610, 1608, 1606, 1604, 1603, 1608, 1583, 0};

  char abuf[40];
//  l = fl_unicode2utf(r_to_l_txt, 8, abuf);
  l = fl_utf8fromwc(abuf, 40, r_to_l_txt, 8);
  abuf[l] = 0;

  right_left_input i5(5, 115, 190, 50);
  i5.textfont(extra_font);
  i5.textsize(30);
  i5.value(abuf);

  Fl_Input i7(5, 230, 190, 25);
  Fl_Input i8(5, 260, 190, 25);
  i7.callback(i7_cb, &i8);
  i7.textsize(20);
  i7.value(abuf);
  i7.when(FL_WHEN_CHANGED);

  wchar_t r_to_l_txt1[] ={/*8238,*/ 1610, 0x20, 1608, 0x20, 1606, 0x20,  1604, 0x20, 1603, 0x20, 1608, 0x20, 1583, 0};

//  l = fl_unicode2utf(r_to_l_txt1, 14, abuf);
  l = fl_utf8fromwc(abuf, 40, r_to_l_txt1, 14);
  abuf[l] = 0;
  right_left_input i6(5, 175, 190, 50);
  i6.textfont(extra_font);
  i6.textsize(30);
  i6.value(abuf);
  
  // Now try Greg Ercolano's Japanese test sequence
  // SOME JAPANESE UTF8 TEXT
  const char *utfstr = "\xe4\xbd\x95\xe3\x82\x82\xe8\xa1"
                 "\x8c\xe3\x82\x8b\xe3\x80\x82"; // 何も行る。

  UCharDropBox db(5, 300, 190, 30);
  db.textsize(16);
  db.value("unichar drop box");
		 
  Fl_Output o9(5, 330, 190, 45);
  o9.textfont(extra_font);
  o9.textsize(30);
  o9.value(utfstr);


  main_win->end();
  fl_set_status(0, 370, 100, 30);

  main_win->show(argc,argv);

  fnt_chooser_win->show();

  int ret = Fl::run();

  // Free up the sizes arrays we allocated
  if(numsizes) {delete [] numsizes;}
  if(sizes) {delete [] sizes;}

  return ret;
}

/* end of file */