package de.blablubbabc.test2;

import java.text.DecimalFormat;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.entity.Villager;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.EquipmentSlot;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitRunnable;

public class Test extends JavaPlugin implements Listener {

	private Entity entity = null;

	@Override
	public void onEnable() {
		Bukkit.getPluginManager().registerEvents(this, this);
	}

	@Override
	public void onDisable() {
	}

	@EventHandler(priority = EventPriority.MONITOR)
	void onBlockClicked(PlayerInteractEvent event) {
		if (event.getHand() != EquipmentSlot.HAND) return;
		Block block = event.getClickedBlock();
		if (block == null || event.getAction() == Action.LEFT_CLICK_BLOCK
				|| (event.getItem() != null && event.getItem().getType() != Material.AIR)) return;
		if (entity != null) {
			// cleanup prev entity:
			entity.remove();
			entity = null;
		}

		// spawning slightly above ground, to make sure this is not due to an edge case:
		Location spawnPos = block.getRelative(event.getBlockFace()).getLocation().add(0.5D, 0.1D, 0.5D);
		entity = block.getWorld().spawn(spawnPos, Villager.class, (e) -> {
			e.setAI(false); // no gravity by default
		});
		DecimalFormat df = new DecimalFormat("0.##");
		Player player = event.getPlayer();
		player.sendMessage("Start in 1 sec");
		new BukkitRunnable() {

			int counter = 0;
			boolean end = false;

			@Override
			public void run() {
				if (!player.isValid() || !entity.isValid()) {
					this.cancel();
					return;
				}
				counter++;
				Location cur = entity.getLocation();
				if (cur.getBlock().getRelative(BlockFace.DOWN).getType() == Material.AIR) {
					// teleport 1 block down:
					Location target = cur.add(0.0D, -1.0D, 0.0D);
					entity.teleport(target);
					player.sendMessage("Teleport to height: " + df.format(target.getY()));
				} else if (!end) {
					player.sendMessage("Last height: " + df.format(cur.getY()));
					end = true;
				}
				if (entity.getLocation().getBlock().getType() != Material.AIR) {
					// this is never reached in this experiment, the entity is only visually inside the block
					player.sendMessage("The entity is inside a block!");
				}
				// remove again after 5 sec or when we hit the ground
				if (counter > 100) {
					entity.remove();
					this.cancel();
				}
			}
		}.runTaskTimer(this, 20L, 1L);
	}
}