package tc.oc.pgm.mutation.types.kit;

import com.google.common.collect.ImmutableMap;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.entity.AbstractHorse;
import org.bukkit.entity.Entity;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Horse;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.player.PlayerSpawnEntityEvent;
import org.bukkit.inventory.HorseInventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.SpawnEggMeta;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;
import tc.oc.commons.core.random.ImmutableWeightedRandomChooser;
import tc.oc.commons.core.random.WeightedRandomChooser;
import tc.oc.pgm.events.MatchPlayerDeathEvent;
import tc.oc.pgm.events.PlayerChangePartyEvent;
import tc.oc.pgm.kits.FreeItemKit;
import tc.oc.pgm.kits.Kit;
import tc.oc.pgm.match.Match;
import tc.oc.pgm.match.MatchPlayer;
import tc.oc.pgm.mutation.types.KitMutation;

import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;

public class EquestrianMutation extends KitMutation {

    final static ImmutableMap<EntityType, Integer> TYPE_MAP = new ImmutableMap.Builder<EntityType, Integer>()
            .put(EntityType.HORSE,          100)
            // FIXME: Saddle do not work on these horses
            //.put(EntityType.SKELETON_HORSE, 5)
            //.put(EntityType.ZOMBIE_HORSE,   5)
            //.put(EntityType.LLAMA,          1)
            .build();

    final static ImmutableMap<Material, Integer> ARMOR_MAP = new ImmutableMap.Builder<Material, Integer>()
            .put(Material.SADDLE,          25)
            .put(Material.GOLD_BARDING,    10)
            .put(Material.IRON_BARDING,    5)
            .put(Material.DIAMOND_BARDING, 1)
            .build();

    final static WeightedRandomChooser<EntityType, Integer> TYPES = new ImmutableWeightedRandomChooser<>(TYPE_MAP);
    final static WeightedRandomChooser<Material, Integer> ARMOR = new ImmutableWeightedRandomChooser<>(ARMOR_MAP);

    final Map<MatchPlayer, AbstractHorse> horses;

    public EquestrianMutation(Match match) {
        super(match, false);
        this.horses = new WeakHashMap<>();
    }

    @Override
    public void disable() {
        super.disable();
        match.participants().forEach(this::remove);
        horses.clear();
    }

    @Override
    public void kits(MatchPlayer player, List<Kit> kits) {
        super.kits(player, kits);
        Location location = player.getLocation();
        // If there is not enough room to spawn a horse, give the player
        // an egg so they can spawn it later
        if(!spawnable(location)) {
            ItemStack item = item(Material.MONSTER_EGG);
            SpawnEggMeta egg = (SpawnEggMeta) item.getItemMeta();
            egg.setSpawnedType(TYPES.choose(entropy));
            item.setItemMeta(egg);
            kits.add(new FreeItemKit(item));
        }
    }

    @Override
    public void apply(MatchPlayer player) {
        super.apply(player);
        Location location = player.getLocation();
        if(spawnable(location)) {
            setup(player, spawn(location, (Class<? extends AbstractHorse>) TYPES.choose(match.entropyForTick()).getEntityClass()));
        }
    }

    @Override
    public void remove(MatchPlayer player) {
        super.remove(player);
        AbstractHorse horse = horses.remove(player);
        if(horse != null) {
            horse.ejectAll();
            horse.remove();
        }
    }

    public void setup(MatchPlayer player, AbstractHorse horse) {
        horses.put(player, horse);
        horse.setAdult();
        horse.setJumpStrength(2 * entropy.randomDouble());
        horse.setDomestication(1);
        horse.setMaxDomestication(1);
        horse.setTamed(true);
        horse.addPotionEffect(new PotionEffect(PotionEffectType.REGENERATION, Integer.MAX_VALUE, 0));
        horse.setOwner(player.getBukkit());
        horse.setPassenger(player.getBukkit());
        if(horse instanceof Horse) {
            Horse horsey = (Horse) horse;
            horsey.setStyle(entropy.randomElement(Horse.Style.values()));
            horsey.setColor(entropy.randomElement(Horse.Color.values()));
            HorseInventory inventory = horsey.getInventory();
            inventory.setSaddle(item(Material.SADDLE));
            inventory.setArmor(item(ARMOR.choose(entropy)));
        }
    }

    public boolean spawnable(Location location) {
        // Allow at least 4 blocks of air from the feet of the player
        // to allow a horse to be spawned
        for(int i = 0; i <= 4; i++) {
            if(!location.clone().add(0, i, 0).getBlock().isEmpty()) {
                return false;
            }
        }
        return true;
    }

    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
    public void onEntitySpawn(PlayerSpawnEntityEvent event) {
        Entity entity = event.getEntity();
        if(TYPE_MAP.containsKey(entity.getType())) {
            match.participant(event.getPlayer())
                 .ifPresent(player -> setup(player, (AbstractHorse) event.getEntity()));
        }
    }

    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
    public void onPlayerDeath(MatchPlayerDeathEvent event) {
        remove(event.getVictim());
    }

    @EventHandler(ignoreCancelled = true, priority = EventPriority.HIGHEST)
    public void onPartyChange(PlayerChangePartyEvent event) {
        remove(event.getPlayer());
    }

}