/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

/** @file animated_tile_sl.cpp Code handling saving and loading of animated tiles. */

#include "../stdafx.h"

#include "saveload.h"
#include "compat/animated_tile_sl_compat.h"

#include "../tile_type.h"

#include "../safeguards.h"

extern std::vector<TileIndex> _animated_tiles;

static const SaveLoad _animated_tile_desc[] = {
	 SLEG_VECTOR("tiles", _animated_tiles, VarTypes::U32),
};

struct ANITChunkHandler : ChunkHandler {
	ANITChunkHandler() : ChunkHandler('ANIT', ChunkType::Table) {}

	void Save() const override
	{
		SlTableHeader(_animated_tile_desc);

		SlSetArrayIndex(0);
		SlGlobList(_animated_tile_desc);
	}

	void Load() const override
	{
		/* Before version 80 we did NOT have a variable length animated tile table */
		if (IsSavegameVersionBefore(SaveLoadVersion::NewGRFMoreAnimation)) {
			/* In pre version 6, we has 16bit per tile, now we have 32bit per tile, convert it ;) */
			TileIndex anim_list[256];
			SlCopy(anim_list, 256, IsSavegameVersionBefore(SaveLoadVersion::MultipleRoadStops) ? (VarFileType::U16 | VarMemType::U32) : VarTypes::U32);

			for (int i = 0; i < 256; i++) {
				if (anim_list[i] == 0) break;
				_animated_tiles.push_back(anim_list[i]);
			}
			return;
		}

		if (IsSavegameVersionBefore(SaveLoadVersion::RiffToArray)) {
			size_t count = SlGetFieldLength() / sizeof(_animated_tiles.front());
			_animated_tiles.clear();
			_animated_tiles.resize(_animated_tiles.size() + count);
			SlCopy(_animated_tiles.data(), count, VarTypes::U32);
			return;
		}

		const std::vector<SaveLoad> slt = SlCompatTableHeader(_animated_tile_desc, _animated_tile_sl_compat);

		if (SlIterateArray() == -1) return;
		SlGlobList(slt);
		if (SlIterateArray() != -1) SlErrorCorrupt("Too many ANIT entries");
	}
};


static const ANITChunkHandler ANIT;
static const ChunkHandlerRef animated_tile_chunk_handlers[] = {
	ANIT,
};

extern const ChunkHandlerTable _animated_tile_chunk_handlers(animated_tile_chunk_handlers);