package tc.oc.pgm.tracker.trackers;

import java.lang.ref.WeakReference;

import org.bukkit.entity.LivingEntity;
import org.bukkit.entity.Player;
import org.bukkit.entity.Slime;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.block.BlockDispenseEntityEvent;
import org.bukkit.event.entity.CreatureSpawnEvent;
import org.bukkit.event.entity.SlimeSplitEvent;
import org.bukkit.event.player.PlayerSpawnEntityEvent;
import tc.oc.pgm.match.ParticipantState;
import tc.oc.pgm.projectile.EntityLaunchEvent;
import tc.oc.pgm.tracker.damage.MobInfo;

/**
 * Updates the state of owned mobs with info about the owner.
 */
public class OwnedMobTracker extends AbstractTracker<MobInfo> {

    private WeakReference<Slime> splitter = new WeakReference<>(null);

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onMobSpawn(PlayerSpawnEntityEvent event) {
        ParticipantState owner = match.getParticipantState(event.getPlayer());
        if(event.getEntity() instanceof LivingEntity && owner != null) {
            LivingEntity mob = (LivingEntity) event.getEntity();
            entities().trackEntity(event.getEntity(), new MobInfo(mob, owner));
        }
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onMobDispense(BlockDispenseEntityEvent event) {
        if(event.getEntity() instanceof LivingEntity) {
            ParticipantState owner = blocks().getOwner(event.getBlock());
            if(owner != null) {
                entities().trackEntity(event.getEntity(), new MobInfo((LivingEntity) event.getEntity(), owner));
            }
        }
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onMobLaunch(EntityLaunchEvent event) {
        if(event.getEntity() instanceof LivingEntity && event.getSource() instanceof Player) {
            ParticipantState shooter = match.getParticipantState((Player) event.getSource());
            if(shooter != null) {
                entities().trackEntity(event.getEntity(), new MobInfo((LivingEntity) event.getEntity(), shooter));
            }
        }
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onSlimeSplit(CreatureSpawnEvent event) {
        switch(event.getSpawnReason()) {
            case SLIME_SPLIT:
                Slime parent = splitter.get();
                if(parent != null) {
                    MobInfo info = resolveEntity(parent);
                    if(info != null) {
                        entities().trackEntity(event.getEntity(), info);
                    }
                }
                break;
        }
    }

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onSlimeSplit(SlimeSplitEvent event) {
        if(event.getCount() > 0 && resolveEntity(event.getEntity()) != null) {
            splitter = new WeakReference<>(event.getEntity());
        }
    }
}