/*
  Copyright (c) 2023 Alex Diener
  
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.
  
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
  
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
  
  Alex Diener alex@ludobloom.com
*/

#include "tileset/TilesetAdjacencyBlendMap.h"
#include "utilities/IOUtilities.h"
#include <assert.h>
#include <limits.h>

TilesetAdjacencyBlendMap * TilesetAdjacencyBlendMap_create(TilesetAdjacencyBlendMapID identifier, const char * name, unsigned int pairCount, TileAdjacencyPair * pairs) {
	TilesetAdjacencyBlendMap * blendMap = malloc(sizeof(*blendMap));
	blendMap->identifier = identifier;
	blendMap->name = strdup_nullSafe(name);
	blendMap->pairCount = pairCount;
	blendMap->pairs = memdup(pairs, pairCount * sizeof(*pairs));
	return blendMap;
}

TilesetAdjacencyBlendMap * TilesetAdjacencyBlendMap_copy(TilesetAdjacencyBlendMap * blendMap) {
	return TilesetAdjacencyBlendMap_create(blendMap->identifier, blendMap->name, blendMap->pairCount, blendMap->pairs);
}

void TilesetAdjacencyBlendMap_dispose(TilesetAdjacencyBlendMap * blendMap) {
	free(blendMap->name);
	free(blendMap);
}

void TilesetAdjacencyBlendMap_serializeMinimal(TilesetAdjacencyBlendMap * blendMap, compat_type(SerializationContext *) serializationContext) {
	SerializationContext * context = serializationContext;
	call_virtual(writeUInt32, context, "id", blendMap->identifier);
	call_virtual(writeString, context, "name", blendMap->name);
	call_virtual(beginArray, context, "pairs");
	for (unsigned int pairIndex = 0; pairIndex < blendMap->pairCount; pairIndex++) {
		call_virtual(beginStructure, context, NULL);
		call_virtual(writeUInt32, context, "tile_1", blendMap->pairs[pairIndex].tileID1);
		call_virtual(writeUInt32, context, "tile_2", blendMap->pairs[pairIndex].tileID2);
		call_virtual(writeUInt32, context, "image_id", blendMap->pairs[pairIndex].sliceImageID);
		call_virtual(endStructure, context);
	}
	call_virtual(endArray, context);
}

void TilesetAdjacencyBlendMap_serialize(TilesetAdjacencyBlendMap * blendMap, compat_type(SerializationContext *) serializationContext) {
	serialize_implementation_v2(TilesetAdjacencyBlendMap, blendMap, TILESET_ADJACENCY_BLEND_MAP);
}

TilesetAdjacencyBlendMap * TilesetAdjacencyBlendMap_deserializeMinimal(compat_type(DeserializationContext *) deserializationContext, uint16_t formatVersion) {
	DeserializationContext * context = deserializationContext;
	if (context->status != SERIALIZATION_ERROR_OK || formatVersion > TILESET_ADJACENCY_BLEND_MAP_FORMAT_VERSION) {
		return NULL;
	}
	TilesetAdjacencyBlendMap * blendMap = TilesetAdjacencyBlendMap_create(0, NULL, 0, NULL);
	blendMap->identifier = call_virtual(readUInt32, context, "id");
	blendMap->name = strdup_nullSafe(call_virtual(readString, context, "name"));
	blendMap->pairCount = call_virtual(beginArray, context, "pairs");
	if (blendMap->pairCount > 0) {
		if (blendMap->pairCount > TILESET_ADJACENCY_BLEND_MAP_PAIR_COUNT_MAX) {
			blendMap->pairCount = 0;
			TilesetAdjacencyBlendMap_dispose(blendMap);
			return NULL;
		}
		blendMap->pairs = malloc(blendMap->pairCount * sizeof(*blendMap->pairs));
		for (unsigned int pairIndex = 0; pairIndex < blendMap->pairCount; pairIndex++) {
			call_virtual(beginStructure, context, NULL);
			blendMap->pairs[pairIndex].tileID1 = call_virtual(readUInt32, context, "tile_1");
			blendMap->pairs[pairIndex].tileID2 = call_virtual(readUInt32, context, "tile_2");
			blendMap->pairs[pairIndex].sliceImageID = call_virtual(readUInt32, context, "image_id");
			call_virtual(endStructure, context);
		}
	}
	call_virtual(endArray, context);
	if (context->status != SERIALIZATION_ERROR_OK) {
		TilesetAdjacencyBlendMap_dispose(blendMap);
		return NULL;
	}
	return blendMap;
}

TilesetAdjacencyBlendMap * TilesetAdjacencyBlendMap_deserialize(compat_type(DeserializationContext *) deserializationContext) {
	deserialize_implementation_v2(TilesetAdjacencyBlendMap, TILESET_ADJACENCY_BLEND_MAP);
}

void TilesetAdjacencyBlendMap_addTileAdjacencyPair(TilesetAdjacencyBlendMap * blendMap, TileAdjacencyPair adjacency) {
	TilesetAdjacencyBlendMap_insertTileAdjacencyPair(blendMap, blendMap->pairCount, adjacency);
}

void TilesetAdjacencyBlendMap_insertTileAdjacencyPair(TilesetAdjacencyBlendMap * blendMap, unsigned int pairIndex, TileAdjacencyPair adjacency) {
	assert(pairIndex <= blendMap->pairCount);
	blendMap->pairs = realloc(blendMap->pairs, (blendMap->pairCount + 1) * sizeof(*blendMap->pairs));
	for (unsigned int pairIndex2 = blendMap->pairCount; pairIndex2 > pairIndex; pairIndex2--) {
		blendMap->pairs[pairIndex2] = blendMap->pairs[pairIndex2 - 1];
	}
	blendMap->pairs[pairIndex] = adjacency;
	blendMap->pairCount++;
}

TileAdjacencyPair * TilesetAdjacencyBlendMap_getTileAdjacencyPair(TilesetAdjacencyBlendMap * blendMap, TileID tileID1, TileID tileID2, unsigned int * outPairIndex) {
	for (unsigned int pairIndex = 0; pairIndex < blendMap->pairCount; pairIndex++) {
		if ((blendMap->pairs[pairIndex].tileID1 == tileID1 && blendMap->pairs[pairIndex].tileID2 == tileID2) ||
		    (blendMap->pairs[pairIndex].tileID1 == tileID2 && blendMap->pairs[pairIndex].tileID2 == tileID1)) {
			if (outPairIndex != NULL) {
				*outPairIndex = pairIndex;
			}
			return &blendMap->pairs[pairIndex];
		}
	}
	if (outPairIndex != NULL) {
		*outPairIndex = UINT_MAX;
	}
	return NULL;
}

void TilesetAdjacencyBlendMap_removeTileAdjacencyPairAtIndex(TilesetAdjacencyBlendMap * blendMap, unsigned int pairIndex) {
	if (pairIndex < blendMap->pairCount) {
		blendMap->pairCount--;
		for (; pairIndex < blendMap->pairCount; pairIndex++) {
			blendMap->pairs[pairIndex] = blendMap->pairs[pairIndex + 1];
		}
	}
}

void TilesetAdjacencyBlendMap_reorderTileAdjacencyPair(TilesetAdjacencyBlendMap * blendMap, unsigned int fromPairIndex, unsigned int toPairIndex) {
	assert(fromPairIndex < blendMap->pairCount);
	assert(toPairIndex < blendMap->pairCount);
	TileAdjacencyPair swap = blendMap->pairs[fromPairIndex];
	int direction = (toPairIndex > fromPairIndex) * 2 - 1;
	for (unsigned int swapIndex = fromPairIndex; swapIndex != toPairIndex; swapIndex += direction) {
		blendMap->pairs[swapIndex] = blendMap->pairs[swapIndex + direction];
	}
	blendMap->pairs[toPairIndex] = swap;
}