/* 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 "chamber/chamber.h"
#include "chamber/common.h"
#include "chamber/invent.h"
#include "chamber/script.h"
#include "chamber/cga.h"
#include "chamber/cursor.h"
#include "chamber/input.h"
#include "chamber/sound.h"

namespace Chamber {

/*inventory box cells*/
#define INVENTORY_SPOTS_MAX (4 * 4)

struct {
	byte   sx;
	byte   ex;
	byte   sy;
	byte   ey;
	byte   name;
	byte   unkn5;
	uint16  command;
	byte   itemidx;
	byte   unkn9;
} inventory_spots[] = {
	{58, 62,  56,  72, 0, 0, 0, 0, 0},
	{62, 66,  56,  72, 0, 0, 0, 0, 0},
	{66, 70,  56,  72, 0, 0, 0, 0, 0},
	{70, 74,  56,  72, 0, 0, 0, 0, 0},
	{58, 62,  72,  88, 0, 0, 0, 0, 0},
	{62, 66,  72,  88, 0, 0, 0, 0, 0},
	{66, 70,  72,  88, 0, 0, 0, 0, 0},
	{70, 74,  72,  88, 0, 0, 0, 0, 0},
	{58, 62,  88, 104, 0, 0, 0, 0, 0},
	{62, 66,  88, 104, 0, 0, 0, 0, 0},
	{66, 70,  88, 104, 0, 0, 0, 0, 0},
	{70, 74,  88, 104, 0, 0, 0, 0, 0},
	{58, 62, 104, 120, 0, 0, 0, 0, 0},
	{62, 66, 104, 120, 0, 0, 0, 0, 0},
	{66, 70, 104, 120, 0, 0, 0, 0, 0},
	{70, 74, 104, 120, 0, 0, 0, 0, 0}
};


byte inv_count = 0;    /*TODO: pass this as param?*/
byte inv_bgcolor = 0;  /*TODO: pass this as param?*/

/*
Filter items and put them inventory box, then draw it if non-empty
filtermask/filtervalue specify area (in high 8 bits) and flags (in lower 8 bits)
*/
void drawInventoryBox(uint16 filtermask, uint16 filtervalue) {
	int16 i;
	byte count = 0;
	for (i = 0; i < MAX_INV_ITEMS; i++) {
		uint16 flags = (inventory_items[i].area << 8) | inventory_items[i].flags;
		if ((flags & filtermask) != filtervalue)
			continue;
		if (count == 0) {
			/*once first valid item found, draw the box*/
			cga_FillAndWait(inv_bgcolor, 64 / 4, 64, CGA_SCREENBUFFER, CalcXY_p(232 / 4, 56));
			playSound(20);
		}
		inventory_spots[count].name = inventory_items[i].name;
		inventory_spots[count].command = inventory_items[i].command;
		inventory_spots[count].itemidx = i + 1;
		drawSpriteN(inventory_items[i].sprite, inventory_spots[count].sx, inventory_spots[count].sy, CGA_SCREENBUFFER);
		count++;
	}
	inv_count = count;
}

void checkInventoryItemHover(byte count) {
	int16 i;
	for (i = 0; i < count; i++) {
		if (isCursorInRect((rect_t *)&inventory_spots[i])) {
			the_command = inventory_spots[i].command;
			command_hint = inventory_spots[i].name;
			cursor_color = 0xAA;
			script_byte_vars.inv_item_index = inventory_spots[i].itemidx;
			script_vars[kScrPool3_CurrentItem] = &inventory_items[script_byte_vars.inv_item_index - 1];
			return;
		}
	}
	/*nothing found*/
	command_hint = 100;
	cursor_color = 0xFF;
	the_command = 0;
}

void openInventory(uint16 filtermask, uint16 filtervalue) {
	the_command = 0;
	cga_BackupImageReal(CalcXY_p(232 / 4, 56), 64 / 4, 64);
	drawInventoryBox(filtermask, filtervalue);
	if (inv_count != 0) {
		selectCursor(CURSOR_FINGER);
		processInput();
		do {
			pollInput();
			checkInventoryItemHover(inv_count);
			if (command_hint != last_command_hint)
				drawCommandHint();
			drawHintsAndCursor(frontbuffer);
		} while (buttons == 0);
		undrawCursor(frontbuffer);
	}
	cga_RestoreImage(scratch_mem2, frontbuffer);
	playSound(20);
	switch (((item_t *)script_vars[kScrPool3_CurrentItem])->name) {
	case 108:	/*DAGGER*/
	case 115:	/*SACRIFICIAL BLADE*/
	case 117:	/*CHOPPER*/
		script_byte_vars.bvar_63 = 1;
		break;
	default:
		script_byte_vars.bvar_63 = 0;
	}
}

} // End of namespace Chamber