import com.mojang.authlib.GameProfile;
import com.mojang.authlib.properties.Property;
import lombok.Getter;
import net.minecraft.server.v1_8_R3.*;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.BlockFace;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftEntity;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer;
import org.bukkit.craftbukkit.v1_8_R3.util.CraftChatMessage;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.metadata.FixedMetadataValue;

import java.util.ArrayList;
import java.util.Collections;
import java.util.UUID;

/**
 * @author Lukas
 */
public class NPC extends ReflectUtils implements Listener {

    private static int currentEntityID = -100;

    private static int nextID() {
        currentEntityID--;
        return currentEntityID;
    }

    private Location location;
    @Getter
    private int entityID;
    private GameProfile gameProfile;
    private String displayName;

    private Look look;
    @Getter
    private Runnable runnable;


    public NPC(Location location) {
        Bukkit.getPluginManager().registerEvents(this, NPCPlugin.getPlugin());
        String value = "eyJ0aW1lc3RhbXAiOjE1MTgzNDE0MDU4ODAsInByb2ZpbGVJZCI6IjM2M2EyMjQ0MThmMTQxMjU5NGVjMDc4MzdmZjhmNjFmIiwicHJvZmlsZU5hbWUiOiJTaG9ydEJ5dGUiLCJzaWduYXR1cmVSZXF1aXJlZCI6dHJ1ZSwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlLzE2N2FlMWIxNmJmZjRjMmVkNDcxYzkwZDQ3Y2U1OTIwNzZkZTUwYzcwM2YxMmVkOTc1YjM1NWVjNGQ3MCJ9fX0=";
        String signature = "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";

        this.location = location;
        this.entityID = nextID();
        this.gameProfile = new GameProfile(UUID.randomUUID(), "ShortByte ยง8[");
        this.gameProfile.getProperties().put("textures", new Property("textures", value, signature));

        this.look = Look.INDIVIDUAL;

        this.displayName = "ShortByte ยง8[";

        this.runnable = () -> {
            for (Player p : Bukkit.getOnlinePlayers()) {
                boolean canSee = p.getWorld().equals(location.getWorld()) && p.getLocation().distanceSquared(location) < 7000;
                if (canSee && !p.hasMetadata("npc_" + this.entityID)) {
                    sendPacket(p, getSpawnPackets());
                    Bukkit.getScheduler().runTaskLater(NPCPlugin.getPlugin(), () -> {
                        sendPacket(p, rideEntity(NPCPlugin.getPlugin().getArmorStand().getEntityId()));
                    }, 2);
                    p.setMetadata("npc_" + this.entityID, new FixedMetadataValue(NPCPlugin.getPlugin(), true));
                } else if (!canSee && p.hasMetadata("npc_" + this.entityID)) {
                    sendPacket(p, getRemovePackets());
                    p.removeMetadata("npc_" + this.entityID, NPCPlugin.getPlugin());
                } else if (canSee) {
                    sendPacket(p, getLookPackets(p.getLocation()));
                    // location.add(0, 0, 0.1);
                    //  sendPacket(p, getMovePacket());
                }
            }
        };
    }

    @EventHandler
    public void onQuit(PlayerQuitEvent event) {
        if (event.getPlayer().hasMetadata("npc_" + this.entityID))
            event.getPlayer().removeMetadata("npc_" + this.entityID, NPCPlugin.getPlugin());
    }

    public Packet<?>[] getSpawnPackets() {
        PacketPlayOutPlayerInfo tablistPacket = new PacketPlayOutPlayerInfo();
        PacketPlayOutPlayerInfo tablistRemovePacket = new PacketPlayOutPlayerInfo();

        PacketPlayOutNamedEntitySpawn spawnPacket = new PacketPlayOutNamedEntitySpawn();

        try {
            PacketPlayOutPlayerInfo.PlayerInfoData playerInfoData = tablistPacket.new PlayerInfoData(gameProfile, 1, WorldSettings.EnumGamemode.NOT_SET, CraftChatMessage.fromString(displayName)[0]);
            setField(tablistPacket, "a", PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER);
            setField(tablistPacket, "b", Collections.singletonList(playerInfoData));

            PacketPlayOutPlayerInfo.PlayerInfoData playerInfoDataRemove = tablistRemovePacket.new PlayerInfoData(gameProfile, 1, WorldSettings.EnumGamemode.NOT_SET, CraftChatMessage.fromString(displayName)[0]);
            setField(tablistRemovePacket, "a", PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER);
            setField(tablistRemovePacket, "b", Collections.singletonList(playerInfoDataRemove));

            DataWatcher watcher = new DataWatcher(null);
            watcher.a(6, (float) 20);
            watcher.a(10, (byte) 127);

            setField(spawnPacket, "a", this.entityID);
            setField(spawnPacket, "b", this.gameProfile.getId());
            setField(spawnPacket, "c", MathHelper.floor(location.getX() * 32.0D));
            setField(spawnPacket, "d", MathHelper.floor(location.getY() * 32.0D));
            setField(spawnPacket, "e", MathHelper.floor(location.getZ() * 32.0D));
            setField(spawnPacket, "f", (byte) ((int) (location.getYaw() * 256.0F / 360.0F)));
            setField(spawnPacket, "g", (byte) ((int) (location.getPitch() * 256.0F / 360.0F)));
            setField(spawnPacket, "h", 0);

            setField(spawnPacket, "i", watcher);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return new Packet<?>[]{tablistPacket, spawnPacket};
    }

    public Packet<?>[] getRemovePackets() {
        PacketPlayOutEntityDestroy destroy = new PacketPlayOutEntityDestroy(entityID);
        return new Packet[]{destroy};
    }

    public Packet<?>[] getLookPackets(Location point) {
        Location clone = this.location.clone();
        final double xDiff = point.getX() - this.location.getX();
        final double yDiff = point.getY() - this.location.getY();
        final double zDiff = point.getZ() - this.location.getZ();

        final double DistanceXZ = Math.sqrt(xDiff * xDiff + zDiff * zDiff);
        final double DistanceY = Math.sqrt(DistanceXZ * DistanceXZ + yDiff * yDiff);

        double newYaw = Math.acos(xDiff / DistanceXZ) * 180 / Math.PI;
        final double newPitch = Math.acos(yDiff / DistanceY) * 180 / Math.PI - 90;

        if (zDiff < 0.0)
            newYaw = newYaw + Math.abs(180 - newYaw) * 2;
        float yy = ((float) (newYaw - 90));
        float pp = ((float) newPitch);
        if (yy != this.location.getYaw() || pp != this.location.getPitch()) {
            clone.setYaw(yy);
            clone.setPitch(pp);
        }

        PacketPlayOutEntity.PacketPlayOutEntityLook packet = new PacketPlayOutEntity.PacketPlayOutEntityLook(this.entityID, (byte) ((int) (clone.getYaw() * 256.0F / 360.0F)), (byte) ((int) (clone.getPitch() * 256.0F / 360.0F)), true);
        PacketPlayOutEntityHeadRotation headPacket = new PacketPlayOutEntityHeadRotation();
        try {
            setField(headPacket, "a", this.entityID);
            setField(headPacket, "b", (byte) ((int) (clone.getYaw() * 256.0F / 360.0F)));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return new Packet[]{packet, headPacket};
    }

    public Packet<?>[] rideEntity(int id) {
        PacketPlayOutAttachEntity packetPlayOutAttachEntity = new PacketPlayOutAttachEntity();

        try {
            setField(packetPlayOutAttachEntity, "a", 0);
            setField(packetPlayOutAttachEntity, "b", entityID);
            setField(packetPlayOutAttachEntity, "c", id);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return new Packet[]{packetPlayOutAttachEntity};
    }

    public Packet<?>[] getMovePacket() {
        boolean onGround = location.getBlock().getRelative(BlockFace.DOWN).getType() != Material.AIR;
        PacketPlayOutEntityTeleport packetPlayOutEntityTeleport = new PacketPlayOutEntityTeleport(entityID, MathHelper.floor(location.getX() * 32.0D), MathHelper.floor(location.getY() * 32.0D), MathHelper.floor(location.getZ() * 32.0D),
                (byte) ((int) (location.getYaw() * 256.0F / 360.0F)), (byte) ((int) (location.getYaw() * 256.0F / 360.0F)), onGround);

        return new Packet[]{packetPlayOutEntityTeleport};
    }

    public void sendPacket(Player player, Packet<?>[] packets) {
        for (Packet<?> packet : packets)
            ((CraftPlayer) player).getHandle().playerConnection.sendPacket(packet);
    }

    public void interact(Player player){}

    public enum Look {
        INDIVIDUAL,
        NONE,
        NEAREST;
    }
}