/*
 * 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.gui.widgets;


import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.gui.GuiTextField;
import net.minecraft.client.renderer.BufferBuilder;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.client.renderer.vertex.DefaultVertexFormats;


/**
 * A modified version of the Minecraft text field.
 * You can initialize it over the full element span.
 * The mouse click area is increased to the full element
 * subtracted with the defined padding.
 *
 * The rendering does pay attention to the size of the '_' caret.
 */
public class MEGuiTextField extends GuiTextField
{
	private static final int PADDING = 2;

	private final int _xPos;
	private final int _yPos;
	private final int _width;
	private final int _height;
	private int selectionColor = 0xFF00FF00;

	/**
	 * Uses the values to instantiate a padded version of a text field.
	 * Pays attention to the '_' caret.
	 *
	 * @param fontRenderer renderer for the strings
	 * @param xPos absolute left position
	 * @param yPos absolute top position
	 * @param width absolute width
	 * @param height absolute height
	 */
	public MEGuiTextField( final FontRenderer fontRenderer, final int xPos, final int yPos, final int width, final int height )
	{
		super( 0, fontRenderer, xPos + PADDING, yPos + PADDING, width - 2 * PADDING - fontRenderer.getCharWidth( '_' ), height - 2 * PADDING );

		this._xPos = xPos;
		this._yPos = yPos;
		this._width = width;
		this._height = height;
	}

	@Override
	public boolean mouseClicked( final int xPos, final int yPos, final int button )
	{
		super.mouseClicked( xPos, yPos, button );

		final boolean requiresFocus = this.isMouseIn( xPos, yPos );
		if( !this.isFocused() )
		{
			this.setFocused( requiresFocus );
		}

		return true;
	}

	/**
	 * Checks if the mouse is within the element
	 *
	 * @param xCoord current x coord of the mouse
	 * @param yCoord current y coord of the mouse
	 *
	 * @return true if mouse position is within the text field area
	 */
	public boolean isMouseIn( final int xCoord, final int yCoord )
	{
		final boolean withinXRange = this._xPos <= xCoord && xCoord < this._xPos + this._width;
		final boolean withinYRange = this._yPos <= yCoord && yCoord < this._yPos + this._height;

		return withinXRange && withinYRange;
	}

	public void selectAll()
	{
		this.setCursorPosition( 0 );
		this.setSelectionPos( this.getMaxStringLength() );
	}

	public void setSelectionColor( int color )
	{
		this.selectionColor = color;
	}

	@Override
	public void drawSelectionBox( int startX, int startY, int endX, int endY )
	{
		if( startX < endX )
		{
			int i = startX;
			startX = endX;
			endX = i;
		}

		startX += 1;
		endX -= 1;

		if( startY < endY )
		{
			int j = startY;
			startY = endY;
			endY = j;
		}

		startY -= PADDING;

		if( endX > this.x + this.width )
		{
			endX = this.x + this.width;
		}

		if( startX > this.x + this.width )
		{
			startX = this.x + this.width;
		}

		Tessellator tessellator = Tessellator.getInstance();
		BufferBuilder bufferbuilder = tessellator.getBuffer();

		float red = (float) ( this.selectionColor >> 16 & 255 ) / 255.0F;
		float blue = (float) ( this.selectionColor >> 8 & 255 ) / 255.0F;
		float green = (float) ( this.selectionColor & 255 ) / 255.0F;
		float alpha = (float) ( this.selectionColor >> 24 & 255 ) / 255.0F;

		GlStateManager.color( red, green, blue, alpha );
		GlStateManager.disableTexture2D();
		GlStateManager.enableColorLogic();
		GlStateManager.colorLogicOp( GlStateManager.LogicOp.OR_REVERSE );
		bufferbuilder.begin( 7, DefaultVertexFormats.POSITION );
		bufferbuilder.pos( (double) startX, (double) endY, 0.0D ).endVertex();
		bufferbuilder.pos( (double) endX, (double) endY, 0.0D ).endVertex();
		bufferbuilder.pos( (double) endX, (double) startY, 0.0D ).endVertex();
		bufferbuilder.pos( (double) startX, (double) startY, 0.0D ).endVertex();
		tessellator.draw();
		GlStateManager.disableColorLogic();
		GlStateManager.enableTexture2D();
	}
}