package melonslise.runicinscription.common.entity;

import java.util.List;
import java.util.UUID;

import javax.annotation.Nullable;

import com.google.common.base.Optional;

import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.init.Blocks;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.datasync.DataParameter;
import net.minecraft.network.datasync.DataSerializers;
import net.minecraft.network.datasync.EntityDataManager;
import net.minecraft.util.EnumParticleTypes;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.RayTraceResult;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.World;

/**
 * @Author Melonslise
 */
public abstract class EntityProjectile extends Entity // TODO Rename to magic projectile (?)
{
    private static final DataParameter<Optional<UUID>> OWNER = EntityDataManager.<Optional<UUID>>createKey(EntityProjectile.class, DataSerializers.OPTIONAL_UNIQUE_ID);
    /** Speed is measured in blocks/tick or 20 blocks/second. */
    /** Used for removing the entity if it has been alive for too long. */
    private int ticksAlive; // TODO die after ticks

    public EntityProjectile(World worldIn) // TODO SET SIZE
    {
        super(worldIn); // TODO add player's motion
    }

    public EntityProjectile(World world, EntityLivingBase caster, double speed)
    {
        super(world);
        this.getDataManager().register(OWNER, Optional.of(caster.getUniqueID()));
        this.setPosition(caster.posX, caster.posY, caster.posZ);
        this.setSpeedFromEntity(caster, speed);
    }

    /**
     * Not sure what this is used for :confused:
     */
    @Override
    protected abstract void entityInit();

    /**
     * Sets the projectile's position in the world. Does the same thing as {@link #setPosition(double, double, double)}, but does not update the bounding box.
     */
    public void setLocation(double coordinateX, double coordinateY, double coordinateZ)
    {
        this.posX = coordinateX;
        this.posY = coordinateY;
        this.posZ = coordinateZ;
    }

    @Override
    public void onUpdate() // TODO COMBINE CODE WITH COLLISION CHECK (?)
    {
        super.onUpdate();

        // Effects
        if(this.shouldBurn())
        {
            this.setFire(1);
        }

        // Collision
        RayTraceResult result = this.checkCollision();
        if (result != null)
        {
            if (result.typeOfHit == RayTraceResult.Type.BLOCK && this.worldObj.getBlockState(result.getBlockPos()).getBlock() == Blocks.PORTAL)
            {
                this.setPortal(result.getBlockPos());
            }
            else
            {
                //if(!net.minecraftforge.common.ForgeHooks.onThrowableImpact(this, raytraceresult)) // TODO OWN HOOK
                this.onImpact(result);
            }
        }

        // Movement
        this.setLocation(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);

        // Water collision
        float multiplier = 1;
        float subtrahend = 0;
        if (this.isInWater())
        {
            if(this.diesInWater())
            {
                this.setDead(); // Longer death + sound
            }
            else
            {
                for (int j = 0; j < 4; ++j)
                {
                    this.worldObj.spawnParticle(EnumParticleTypes.WATER_BUBBLE, this.posX - this.motionX * 0.25D, this.posY - this.motionY * 0.25D, this.posZ - this.motionZ * 0.25D, this.motionX, this.motionY, this.motionZ, new int[0]);
                }
                multiplier = 0.9F;
                subtrahend = 0.2F;
            }
        }

        this.motionX *= (double) multiplier; // TODO Apply actual physics formulae (probably mg-pgV)
        this.motionZ *= (double) multiplier;
        this.motionY -= (double) subtrahend;
        // TODO set up hasnogravity and gravity velocity
        this.setPosition(this.posX, this.posY, this.posZ); // Not sure why this is needed, but I suspect it has something to do with it's aabb

        // Particle trail
        this.spawnParticleTrail();
    }

    protected RayTraceResult checkCollision()
    {
        Vec3d vector1 = new Vec3d(this.posX, this.posY, this.posZ);
        Vec3d vector2 = new Vec3d(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
        RayTraceResult result1 = this.worldObj.rayTraceBlocks(vector1, vector2);
        if (result1 != null)
        {
            vector2 = new Vec3d(result1.hitVec.xCoord, result1.hitVec.yCoord, result1.hitVec.zCoord);
        }

        Entity entity1 = null;
        List<Entity> entities = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, this.getEntityBoundingBox().addCoord(this.motionX, this.motionY, this.motionZ).expandXyz(1.0D)); // TODO FIGURE OUT WHY EXPAND BY 1
        double d0 = 0.0D;
        for (int a = 0; a < entities.size(); ++a)
        {
            Entity entity2 = (Entity)entities.get(a);
            if(entity2.canBeCollidedWith() && !entity2.getUniqueID().equals(this.getCasterUUID())) // Exclude entities here
            {
                AxisAlignedBB aabb = entity2.getEntityBoundingBox().expandXyz(0.30000001192092896D); // Why expand?
                RayTraceResult result2 = aabb.calculateIntercept(vector1, vector2);
                if (result2 != null)
                {
                    double d1 = vector1.squareDistanceTo(result2.hitVec);
                    if (d1 < d0 || d0 == 0.0D)
                    {
                        entity1 = entity2;
                        d0 = d1;
                    }
                }
            }
        }
        if (entity1 != null)
        {
            result1 = new RayTraceResult(entity1);
        }
        return result1;
    }

    /**
     * Called when the projectile collides with a block or entity.
     */
    protected abstract void onImpact(RayTraceResult result);

    /**
     * Spawns particles around the projectile. Called from {@link #onUpdate()}.
     */
    protected abstract void spawnParticleTrail();

    /**
     * Determines if the projectile will die after colliding with water.
     */
    public abstract boolean diesInWater();

    /**
     * Determines if the projectile should burn like a fireball.
     */
    public abstract boolean shouldBurn();

    /**
     * Sets the projectile's speed on the three axes.
     */
    public void setSpeed(double speedX, double speedY, double speedZ)
    {
        this.motionX = speedX;
        this.motionY = speedY;
        this.motionZ = speedZ;
    }

    /**
     * Sets the projectile's speed depending on the caster's facing.
     */
    public void setSpeedFromEntity(EntityLivingBase caster, double speed)
    {
        Vec3d vector = caster.getLookVec();
        this.setSpeed(vector.xCoord * speed, vector.yCoord * speed, vector.zCoord * speed);
    }

    @Override
    protected void readEntityFromNBT(NBTTagCompound nbt) // TODO
    {
        /**
        UUID uuid = nbt.getUniqueId("ownerUUID");
        if(uuid != null)
        {
            this.getDataManager().set(OWNER, Optional.of(uuid));
        }
        */
    }

    @Override
    protected void writeEntityToNBT(NBTTagCompound nbt) // TODO
    {
        /**
        Optional<UUID> uuid = this.getDataManager().get(OWNER);
        if(uuid.isPresent())
        {
            nbt.setUniqueId("ownerUUID", uuid.get());
        }
        */
    }

    /**
     * Returns the caster's UUID.
     */
    @Nullable
    public UUID getCasterUUID() // TODO
    {
        Optional<UUID> uuid = this.getDataManager().get(OWNER);
        return uuid.get();
    }

    @Nullable
    public EntityLivingBase getCaster() // TODO
    {
        return this.worldObj.getPlayerEntityByUUID(this.getCasterUUID());
    }

    /** *** OLD ***
    @Nullable
    public EntityLivingBase getCaster()
    {
        if (this.caster == null && this.casterName != null && !this.casterName.isEmpty())
        {
            this.caster = this.worldObj.getPlayerEntityByName(this.casterName);

            if (this.caster == null && this.worldObj instanceof WorldServer)
            {
                try
                {
                    Entity entity = ((WorldServer)this.worldObj).getEntityFromUuid(UUID.fromString(this.casterName));
                    if (entity instanceof EntityLivingBase)
                    {
                        this.caster = (EntityLivingBase)entity;
                    }
                }
                catch (Throwable error)
                {
                    this.caster = null;
                }
            }
        }
        return this.caster;
    }
    */
}