001package net.minecraft.block;
002
003import cpw.mods.fml.relauncher.Side;
004import cpw.mods.fml.relauncher.SideOnly;
005import java.util.List;
006import java.util.Random;
007import net.minecraft.client.renderer.texture.IconRegister;
008import net.minecraft.command.IEntitySelector;
009import net.minecraft.entity.Entity;
010import net.minecraft.entity.item.EntityMinecart;
011import net.minecraft.inventory.Container;
012import net.minecraft.inventory.IInventory;
013import net.minecraft.util.AxisAlignedBB;
014import net.minecraft.util.Icon;
015import net.minecraft.world.IBlockAccess;
016import net.minecraft.world.World;
017
018public class BlockDetectorRail extends BlockRailBase
019{
020    @SideOnly(Side.CLIENT)
021    private Icon[] iconArray;
022
023    public BlockDetectorRail(int par1)
024    {
025        super(par1, true);
026        this.setTickRandomly(true);
027    }
028
029    /**
030     * How many world ticks before ticking
031     */
032    public int tickRate(World par1World)
033    {
034        return 20;
035    }
036
037    /**
038     * Can this block provide power. Only wire currently seems to have this change based on its state.
039     */
040    public boolean canProvidePower()
041    {
042        return true;
043    }
044
045    /**
046     * Triggered whenever an entity collides with this block (enters into the block). Args: world, x, y, z, entity
047     */
048    public void onEntityCollidedWithBlock(World par1World, int par2, int par3, int par4, Entity par5Entity)
049    {
050        if (!par1World.isRemote)
051        {
052            int l = par1World.getBlockMetadata(par2, par3, par4);
053
054            if ((l & 8) == 0)
055            {
056                this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, l);
057            }
058        }
059    }
060
061    /**
062     * Ticks the block if it's been scheduled
063     */
064    public void updateTick(World par1World, int par2, int par3, int par4, Random par5Random)
065    {
066        if (!par1World.isRemote)
067        {
068            int l = par1World.getBlockMetadata(par2, par3, par4);
069
070            if ((l & 8) != 0)
071            {
072                this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, l);
073            }
074        }
075    }
076
077    /**
078     * Returns true if the block is emitting indirect/weak redstone power on the specified side. If isBlockNormalCube
079     * returns true, standard redstone propagation rules will apply instead and this will not be called. Args: World, X,
080     * Y, Z, side. Note that the side is reversed - eg it is 1 (up) when checking the bottom of the block.
081     */
082    public int isProvidingWeakPower(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
083    {
084        return (par1IBlockAccess.getBlockMetadata(par2, par3, par4) & 8) != 0 ? 15 : 0;
085    }
086
087    /**
088     * Returns true if the block is emitting direct/strong redstone power on the specified side. Args: World, X, Y, Z,
089     * side. Note that the side is reversed - eg it is 1 (up) when checking the bottom of the block.
090     */
091    public int isProvidingStrongPower(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
092    {
093        return (par1IBlockAccess.getBlockMetadata(par2, par3, par4) & 8) == 0 ? 0 : (par5 == 1 ? 15 : 0);
094    }
095
096    /**
097     * Update the detector rail power state if a minecart enter, stays or leave the block.
098     */
099    private void setStateIfMinecartInteractsWithRail(World par1World, int par2, int par3, int par4, int par5)
100    {
101        boolean flag = (par5 & 8) != 0;
102        boolean flag1 = false;
103        float f = 0.125F;
104        List list = par1World.getEntitiesWithinAABB(EntityMinecart.class, AxisAlignedBB.getAABBPool().getAABB((double)((float)par2 + f), (double)par3, (double)((float)par4 + f), (double)((float)(par2 + 1) - f), (double)((float)(par3 + 1) - f), (double)((float)(par4 + 1) - f)));
105
106        if (!list.isEmpty())
107        {
108            flag1 = true;
109        }
110
111        if (flag1 && !flag)
112        {
113            par1World.setBlockMetadataWithNotify(par2, par3, par4, par5 | 8, 3);
114            par1World.notifyBlocksOfNeighborChange(par2, par3, par4, this.blockID);
115            par1World.notifyBlocksOfNeighborChange(par2, par3 - 1, par4, this.blockID);
116            par1World.markBlockRangeForRenderUpdate(par2, par3, par4, par2, par3, par4);
117        }
118
119        if (!flag1 && flag)
120        {
121            par1World.setBlockMetadataWithNotify(par2, par3, par4, par5 & 7, 3);
122            par1World.notifyBlocksOfNeighborChange(par2, par3, par4, this.blockID);
123            par1World.notifyBlocksOfNeighborChange(par2, par3 - 1, par4, this.blockID);
124            par1World.markBlockRangeForRenderUpdate(par2, par3, par4, par2, par3, par4);
125        }
126
127        if (flag1)
128        {
129            par1World.scheduleBlockUpdate(par2, par3, par4, this.blockID, this.tickRate(par1World));
130        }
131
132        par1World.func_96440_m(par2, par3, par4, this.blockID);
133    }
134
135    /**
136     * Called whenever the block is added into the world. Args: world, x, y, z
137     */
138    public void onBlockAdded(World par1World, int par2, int par3, int par4)
139    {
140        super.onBlockAdded(par1World, par2, par3, par4);
141        this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, par1World.getBlockMetadata(par2, par3, par4));
142    }
143
144    /**
145     * If this returns true, then comparators facing away from this block will use the value from
146     * getComparatorInputOverride instead of the actual redstone signal strength.
147     */
148    public boolean hasComparatorInputOverride()
149    {
150        return true;
151    }
152
153    /**
154     * If hasComparatorInputOverride returns true, the return value from this is used instead of the redstone signal
155     * strength when this block inputs to a comparator.
156     */
157    public int getComparatorInputOverride(World par1World, int par2, int par3, int par4, int par5)
158    {
159        if ((par1World.getBlockMetadata(par2, par3, par4) & 8) > 0)
160        {
161            float f = 0.125F;
162            List list = par1World.selectEntitiesWithinAABB(EntityMinecart.class, AxisAlignedBB.getAABBPool().getAABB((double)((float)par2 + f), (double)par3, (double)((float)par4 + f), (double)((float)(par2 + 1) - f), (double)((float)(par3 + 1) - f), (double)((float)(par4 + 1) - f)), IEntitySelector.field_96566_b);
163
164            if (list.size() > 0)
165            {
166                return Container.func_94526_b((IInventory)list.get(0));
167            }
168        }
169
170        return 0;
171    }
172
173    @SideOnly(Side.CLIENT)
174
175    /**
176     * When this method is called, your block should register all the icons it needs with the given IconRegister. This
177     * is the only chance you get to register icons.
178     */
179    public void registerIcons(IconRegister par1IconRegister)
180    {
181        this.iconArray = new Icon[2];
182        this.iconArray[0] = par1IconRegister.registerIcon("detectorRail");
183        this.iconArray[1] = par1IconRegister.registerIcon("detectorRail_on");
184    }
185
186    @SideOnly(Side.CLIENT)
187
188    /**
189     * From the specified side and block metadata retrieves the blocks texture. Args: side, metadata
190     */
191    public Icon getBlockTextureFromSideAndMetadata(int par1, int par2)
192    {
193        return (par2 & 8) != 0 ? this.iconArray[1] : this.iconArray[0];
194    }
195}