/*
Copyright (C) 2000 The Exult Team

This program 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; either version 2
of the License, or (at your option) any later version.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#ifndef ALPHA_LINUX_CXX
#  include <cstring>
#endif

#include "gamewin.h"
#include "Text_gump.h"

#ifndef UNDER_CE
using std::strchr;
using std::strcpy;
using std::strlen;
#endif

/*
 *	Add to the text, starting a newline.
 */

void Text_gump::add_text
	(
	const char *str
	)
{
	int slen = strlen(str);		// Length of new text.
					// Allocate new space.
	char *newtext = new char[textlen + (textlen != 0) + slen + 1];
	if (textlen)			// Copy over old.
		{
		strcpy(newtext, text);
		// Add new line if not starting a new page and if first char of new string is
		// not a new line
		if (newtext[textlen-1] != '*') newtext[textlen++] = '~';
		}
	strcpy(newtext + textlen, str);	// Append new.
	delete [] text;
	text = newtext;
	textlen += slen;
}

/*
 *	Paint a page and find where its text ends.
 *
 *	Output:	Index past end of displayed page.
 */

int Text_gump::paint_page
	(
	Rectangle box,			// Display box rel. to gump.
	int start			// Starting offset into text.
	)
{
	const int font = serpentine?8:4;	// Black.
	const int vlead = 1;		// Extra inter-line spacing.
	int ypos = 0;
	int textheight = sman->get_text_height(font) + vlead;
	char *str = text + start;
	while (*str && *str != '*' && ypos + textheight <= box.h)
	{
		if (*str == '~')	// Empty paragraph?
		{
			ypos += textheight;
			str++;
			continue;
		}
					// Look for page break.
		char *epage = strchr(str, '*');
					// Look for line break.
		char *eol = strchr(str, '~');
		if (epage && (!eol || eol > epage))
			eol = epage;
		if (!eol)		// No end found?
			eol = text + textlen;
		char eolchr = *eol;	// Save char. at EOL.
		*eol = 0;
		int endoff = sman->paint_text_box(font, str, x + box.x,
				y + box.y + ypos, box.w, box.h - ypos, vlead);
		*eol = eolchr;		// Restore char.
		if (endoff > 0)		// All painted?
		{		// Value returned is height.
			str = eol + (eolchr == '~');
			ypos += endoff;
		}
		else			// Out of room.
		{
			str += -endoff;
			break;
		}
	}
	if (*str == '*')		// Saw end of page?
		str++;
	gwin->set_painted();		// Force blit.
	return (str - text);		// Return offset past end.
}

/*
 *	Show next page(s) of book or scroll.
 *
 *	Output:	0 if already at end.
 */

int Text_gump::show_next_page
	(
	)
{
	if (curend >= textlen)
		return (0);		// That's all, folks.
	curtop = curend;		// Start next page or pair of pages.
	paint();			// Paint.  This updates curend.
	return (1);
}