/* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "sherlock/inventory.h"
#include "sherlock/sherlock.h"

namespace Sherlock {

Inventory::Inventory(SherlockEngine *vm) : Common::Array<InventoryItem>(), _vm(vm) {
	Common::fill(&_invShapes[0], &_invShapes[MAX_VISIBLE_INVENTORY], (ImageFile *)nullptr);
	_invGraphicsLoaded = false;
	_invIndex = 0;
	_holdings = 0;
}

Inventory::~Inventory() {
	freeGraphics();
}

void Inventory::freeInventory() {
	freeGraphics();

	_names.clear();
	_invGraphicsLoaded = false;
}

/**
 * Free any loaded inventory graphics
 */
void Inventory::freeGraphics() {
	for (uint idx = 0; idx < MAX_VISIBLE_INVENTORY; ++idx)
		delete _invShapes[idx];
	
	Common::fill(&_invShapes[0], &_invShapes[MAX_VISIBLE_INVENTORY], (ImageFile *)nullptr);
	_invGraphicsLoaded = false;
}

/** Load the list of names the inventory items correspond to.
 */
void Inventory::loadInv() {
	// Exit if the inventory names are already loaded
	if (_names.size() > 0)
		return;

	// Load the inventory names
	Common::SeekableReadStream *stream = _vm->_res->load("invent.txt");
	_names.clear();

	while (stream->pos() < stream->size()) {
		Common::String name;
		char c;
		while ((c = stream->readByte()) != 0)
			name += c;

		_names.push_back(name);
	}
	
	delete stream;
}

/**
 * Load the list of names of graphics for the inventory
 */
void Inventory::loadGraphics() {
	if (_invGraphicsLoaded)
		return;

	// Default all inventory slots to empty
	Common::fill(&_invShapes[0], &_invShapes[MAX_VISIBLE_INVENTORY], (ImageFile *)nullptr);

	for (int idx = _invIndex; (idx < _holdings) && (idx - _invIndex) < 6; ++idx) {
		// Get the name of the item to be dispalyed, figure out it's accompanying
		// .VGS file with it's picture, and then load it
		int invNum = findInv((*this)[idx]._name);
		Common::String fName = Common::String::format("item%02d.vgs", invNum);

		_invShapes[idx] = new ImageFile(fName);
	}

	_invGraphicsLoaded = true;
}

/**
 * Searches through the list of names that correspond to the inventory items
 * and returns the numer that matches the passed name
 */
int Inventory::findInv(const Common::String &name) {
	int result = -1;

	for (int idx = 0; (idx < _holdings) && result == -1; ++idx) {
		if (scumm_stricmp(name.c_str(), _names[idx].c_str()) == 0)
			result = idx;
	}

	if (result == -1)
		result = 1;
	return result;
}

} // End of namespace Sherlock