/*
 * MapViewCache.cpp, part of VCMI engine
 *
 * Authors: listed in file AUTHORS in main folder
 *
 * License: GNU General Public License v2.0 or later
 * Full text of license available in license.txt file, in main folder
 *
 */

#include "StdInc.h"
#include "MapViewCache.h"

#include "MapRenderer.h"
#include "MapViewModel.h"

#include "../render/CAnimation.h"
#include "../render/Canvas.h"
#include "../render/IImage.h"

#include "../../lib/mapObjects/CObjectHandler.h"

MapViewCache::~MapViewCache() = default;

MapViewCache::MapViewCache(const std::shared_ptr<MapViewModel> & model)
	: model(model)
	, mapRenderer(new MapRenderer())
	, iconsStorage(new CAnimation("VwSymbol"))
	, intermediate(new Canvas(Point(32, 32)))
	, terrain(new Canvas(model->getCacheDimensionsPixels()))
{
	iconsStorage->preload();
	for(size_t i = 0; i < iconsStorage->size(); ++i)
		iconsStorage->getImage(i)->setBlitMode(EImageBlitMode::COLORKEY);
}

Canvas MapViewCache::getTile(const int3 & coordinates)
{
	return Canvas(*terrain, model->getCacheTileArea(coordinates));
}

std::shared_ptr<IImage> MapViewCache::getOverlayImageForTile(const std::shared_ptr<MapRendererContext> & context, const int3 & coordinates)
{
	size_t imageIndex = context->overlayImageIndex(coordinates);

	if(imageIndex < iconsStorage->size())
		return iconsStorage->getImage(imageIndex);
	return nullptr;
}

void MapViewCache::updateTile(const std::shared_ptr<MapRendererContext> & context, const int3 & coordinates)
{
	Canvas target = getTile(coordinates);

	if(model->getSingleTileSize() == Point(32, 32))
	{
		mapRenderer->renderTile(*context, target, coordinates);
	}
	else
	{
		mapRenderer->renderTile(*context, *intermediate, coordinates);
		target.drawScaled(*intermediate, Point(0, 0), model->getSingleTileSize());
	}
}

void MapViewCache::update(const std::shared_ptr<MapRendererContext> & context)
{
	Rect dimensions = model->getTilesTotalRect();

	for(int y = dimensions.top(); y < dimensions.bottom(); ++y)
		for(int x = dimensions.left(); x < dimensions.right(); ++x)
			updateTile(context, {x, y, model->getLevel()});
}

void MapViewCache::render(const std::shared_ptr<MapRendererContext> & context, Canvas & target)
{
	Rect dimensions = model->getTilesTotalRect();

	for(int y = dimensions.top(); y < dimensions.bottom(); ++y)
	{
		for(int x = dimensions.left(); x < dimensions.right(); ++x)
		{
			int3 tile(x, y, model->getLevel());
			Canvas source = getTile(tile);
			Rect targetRect = model->getTargetTileArea(tile);
			target.draw(source, targetRect.topLeft());
		}
	}

	if (context->showOverlay())
	{
		for(int y = dimensions.top(); y < dimensions.bottom(); ++y)
		{
			for(int x = dimensions.left(); x < dimensions.right(); ++x)
			{
				int3 tile(x, y, model->getLevel());
				Rect targetRect = model->getTargetTileArea(tile);
				auto overlay = getOverlayImageForTile(context, tile);

				if (overlay)
				{
					Point position = targetRect.center() - overlay->dimensions() / 2;
					target.draw(overlay, position);
				}
			}
		}
	}
}