/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.client.render;


import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.item.ItemStack;

import appeng.api.storage.data.IAEItemStack;
import appeng.core.AEConfig;
import appeng.core.localization.GuiText;
import appeng.util.ISlimReadableNumberConverter;
import appeng.util.IWideReadableNumberConverter;
import appeng.util.ReadableNumberConverter;


/**
 * @author AlgorithmX2
 * @author thatsIch
 * @version rv2
 * @since rv0
 */
public class StackSizeRenderer
{
	private static final ISlimReadableNumberConverter SLIM_CONVERTER = ReadableNumberConverter.INSTANCE;
	private static final IWideReadableNumberConverter WIDE_CONVERTER = ReadableNumberConverter.INSTANCE;

	public void renderStackSize( FontRenderer fontRenderer, IAEItemStack aeStack, ItemStack is, int xPos, int yPos )
	{
		if( is != null )
		{
			final float scaleFactor = AEConfig.instance().useTerminalUseLargeFont() ? 0.85f : 0.5f;
			final float inverseScaleFactor = 1.0f / scaleFactor;
			final int offset = AEConfig.instance().useTerminalUseLargeFont() ? 0 : -1;

			final boolean unicodeFlag = fontRenderer.getUnicodeFlag();
			fontRenderer.setUnicodeFlag( false );

			if( is.stackSize == 0 )
			{
				final String craftLabelText = AEConfig.instance().useTerminalUseLargeFont() ? GuiText.LargeFontCraft.getLocal() : GuiText.SmallFontCraft.getLocal();
				GlStateManager.disableLighting();
				GlStateManager.disableDepth();
				GlStateManager.disableBlend();
				GlStateManager.pushMatrix();
				GlStateManager.scale( scaleFactor, scaleFactor, scaleFactor );
				final int X = (int) ( ( (float) xPos + offset + 16.0f - fontRenderer.getStringWidth( craftLabelText ) * scaleFactor ) * inverseScaleFactor );
				final int Y = (int) ( ( (float) yPos + offset + 16.0f - 7.0f * scaleFactor ) * inverseScaleFactor );
				fontRenderer.drawStringWithShadow( craftLabelText, X, Y, 16777215 );
				GlStateManager.popMatrix();
				GlStateManager.enableLighting();
				GlStateManager.enableDepth();
				GlStateManager.enableBlend();
			}

			final long amount = aeStack != null ? aeStack.getStackSize() : is.stackSize;
			if( amount != 0 )
			{
				final String stackSize = this.getToBeRenderedStackSize( amount );

				GlStateManager.disableLighting();
				GlStateManager.disableDepth();
				GlStateManager.disableBlend();
				GlStateManager.pushMatrix();
				GlStateManager.scale( scaleFactor, scaleFactor, scaleFactor );
				final int X = (int) ( ( (float) xPos + offset + 16.0f - fontRenderer.getStringWidth( stackSize ) * scaleFactor ) * inverseScaleFactor );
				final int Y = (int) ( ( (float) yPos + offset + 16.0f - 7.0f * scaleFactor ) * inverseScaleFactor );
				fontRenderer.drawStringWithShadow( stackSize, X, Y, 16777215 );
				GlStateManager.popMatrix();
				GlStateManager.enableLighting();
				GlStateManager.enableDepth();
				GlStateManager.enableBlend();
			}

			fontRenderer.setUnicodeFlag( unicodeFlag );
		}
	}

	private String getToBeRenderedStackSize( final long originalSize )
	{
		if( AEConfig.instance().useTerminalUseLargeFont() )
		{
			return SLIM_CONVERTER.toSlimReadableForm( originalSize );
		}
		else
		{
			return WIDE_CONVERTER.toWideReadableForm( originalSize );
		}
	}

}