/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ags/engine/gui/my_listbox.h"
#include "ags/shared/ac/common.h"
#include "ags/engine/ac/game_setup.h"
#include "ags/shared/ac/keycode.h"
#include "ags/shared/font/fonts.h"
#include "ags/shared/gfx/bitmap.h"
#include "ags/engine/gui/gui_dialog.h"
#include "ags/engine/gui/gui_dialog_defines.h"

namespace AGS3 {

using namespace AGS::Shared;

MyListBox::MyListBox(int xx, int yy, int wii, int hii) {
	x = xx;
	y = yy;
	wid = wii;
	hit = hii;
	hit -= (hit - 4) % TEXT_HT; // resize to multiple of text height
	numonscreen = (hit - 4) / TEXT_HT;
	items = 0;
	topitem = 0;
	selected = -1;
	memset(itemnames, 0, sizeof(itemnames));
}

void MyListBox::clearlist() {
	for (int kk = 0; kk < items; kk++)
		free(itemnames[kk]);

	items = 0;
}

MyListBox::~MyListBox() {
	clearlist();
}

void MyListBox::draw(Bitmap *ds) {
	color_t draw_color = ds->GetCompatibleColor(_G(windowbackgroundcolor));
	ds->FillRect(Rect(x, y, x + wid, y + hit), draw_color);
	draw_color = ds->GetCompatibleColor(0);
	ds->DrawRect(Rect(x, y, x + wid, y + hit), draw_color);

	int widwas = wid;
	wid -= ARROWWIDTH;
	ds->DrawLine(Line(x + wid, y, x + wid, y + hit), draw_color);        // draw the up/down arrows
	ds->DrawLine(Line(x + wid, y + hit / 2, x + widwas, y + hit / 2), draw_color);

	int xmidd = x + wid + (widwas - wid) / 2;
	if (topitem < 1)
		draw_color = ds->GetCompatibleColor(7);

	ds->DrawLine(Line(xmidd, y + 2, xmidd, y + 10), draw_color); // up arrow
	ds->DrawLine(Line(xmidd - 1, y + 3, xmidd + 1, y + 3), draw_color);
	ds->DrawLine(Line(xmidd - 2, y + 4, xmidd + 2, y + 4), draw_color);
	draw_color = ds->GetCompatibleColor(0);
	if (topitem + numonscreen >= items)
		draw_color = ds->GetCompatibleColor(7);

	ds->DrawLine(Line(xmidd, y + hit - 10, xmidd, y + hit - 3), draw_color);     // down arrow
	ds->DrawLine(Line(xmidd - 1, y + hit - 4, xmidd + 1, y + hit - 4), draw_color);
	ds->DrawLine(Line(xmidd - 2, y + hit - 5, xmidd + 2, y + hit - 5), draw_color);
	draw_color = ds->GetCompatibleColor(0);

	for (int tt = 0; tt < numonscreen; tt++) {
		int inum = tt + topitem;
		if (inum >= items)
			break;

		int thisypos = y + 2 + tt * TEXT_HT;
		color_t text_color;
		if (inum == selected) {
			draw_color = ds->GetCompatibleColor(0);
			ds->FillRect(Rect(x, thisypos, x + wid, thisypos + TEXT_HT - 1), draw_color);
			text_color = ds->GetCompatibleColor(7);
		} else text_color = ds->GetCompatibleColor(0);

		wouttextxy(ds, x + 2, thisypos, _G(cbuttfont), text_color, itemnames[inum]);
	}
	wid = widwas;
}

int MyListBox::pressedon(int mousex, int mousey) {
	if (mousex > x + wid - ARROWWIDTH) {
		if ((mousey - y < hit / 2) && (topitem > 0))
			topitem--;
		else if ((mousey - y > hit / 2) && (topitem + numonscreen < items))
			topitem++;

	} else {
		selected = ((mousey - y) - 2) / TEXT_HT + topitem;
		if (selected >= items)
			selected = items - 1;

	}

	draw(get_gui_screen());
	_G(smcode) = CM_SELCHANGE;
	return 0;
}

void MyListBox::additem(char *texx) {
	if (items >= MAXLISTITEM)
		quit("!CSCIUSER16: Too many items added to listbox");
	size_t ln = strlen(texx) + 1;
	itemnames[items] = (char *)malloc(ln);
	Common::strcpy_s(itemnames[items], ln, texx);
	items++;
	needredraw = 1;
}

int MyListBox::processmessage(int mcode, int wParam, NumberPtr lParam) {
	if (mcode == CLB_ADDITEM) {
		additem((char *)lParam.ptr());
	} else if (mcode == CLB_CLEAR)
		clearlist();
	else if (mcode == CLB_GETCURSEL)
		return selected;
	else if (mcode == CLB_SETCURSEL) {
		selected = wParam;

		if ((selected < topitem) && (selected >= 0))
			topitem = selected;

		if (topitem + numonscreen <= selected)
			topitem = (selected + 1) - numonscreen;
	} else if (mcode == CLB_GETTEXT)
		Common::strcpy_s((char *)lParam.ptr(), 260, itemnames[wParam]);
	else if (mcode == CLB_SETTEXT) {
		if (wParam < items)
			free(itemnames[wParam]);

		char *newstri = (char *)lParam.ptr();
		size_t ln = strlen(newstri) + 2;
		itemnames[wParam] = (char *)malloc(ln);
		Common::strcpy_s(itemnames[wParam], ln, newstri);

	} else if (mcode == CTB_KEYPRESS) {
		if ((wParam == eAGSKeyCodeDownArrow) && (selected < items - 1))
			selected++;

		if ((wParam == eAGSKeyCodeUpArrow) && (selected > 0))
			selected--;

		if (wParam == eAGSKeyCodePageUp)
			selected -= (numonscreen - 1);

		if (wParam == eAGSKeyCodePageDown)
			selected += (numonscreen - 1);

		if ((selected < 0) && (items > 0))
			selected = 0;

		if (selected >= items)
			selected = items - 1;

		if ((selected < topitem) && (selected >= 0))
			topitem = selected;

		if (topitem + numonscreen <= selected)
			topitem = (selected + 1) - numonscreen;

		drawandmouse();
		_G(smcode) = CM_SELCHANGE;
	} else
		return -1;

	return 0;
}

} // namespace AGS3