package net.apunch.blacksmith;

import net.apunch.blacksmith.util.Settings.Setting;
import net.citizensnpcs.api.npc.NPC;
import net.citizensnpcs.api.trait.Trait;
import net.citizensnpcs.api.util.DataKey;
import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.NamespacedKey;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.entity.LivingEntity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.Damageable;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Random;

public class BlacksmithTrait extends Trait {
    private static final String[] enchantments = new String[Enchantment.values().length];

    private final BlacksmithPlugin plugin;
    private final List<Material> reforgeAbleItems = new ArrayList<>();
    private final Map<String, Calendar> coolDowns = new HashMap<>();
    private ReforgeSession session;

    // Defaults
    private String busyWithPlayerMsg = Setting.BUSY_WITH_PLAYER_MESSAGE.asString();
    private String busyReforgingMsg = Setting.BUSY_WITH_REFORGE_MESSAGE.asString();
    private String costMsg = Setting.COST_MESSAGE.asString();
    private String invalidItemMsg = Setting.INVALID_ITEM_MESSAGE.asString();
    private String startReforgeMsg = Setting.START_REFORGE_MESSAGE.asString();
    private String successMsg = Setting.SUCCESS_MESSAGE.asString();
    private String failMsg = Setting.FAIL_MESSAGE.asString();
    private String insufficientFundsMsg = Setting.INSUFFICIENT_FUNDS_MESSAGE.asString();
    private String coolDownUnexpiredMessage = Setting.COOLDOWN_UNEXPIRED_MESSAGE.asString();
    private String itemChangedMsg = Setting.ITEM_UNEXPECTEDLY_CHANGED_MESSAGE.asString();
    private int minReforgeDelay = Setting.MIN_REFORGE_DELAY.asInt();
    private int maxReforgeDelay = Setting.MAX_REFORGE_DELAY.asInt();
    private int reforgeCoolDown = Setting.REFORGE_COOLDOWN.asInt();
    private int failChance = Setting.FAIL_CHANCE.asInt();
    private int extraEnchantmentChance = Setting.EXTRA_ENCHANTMENT_CHANCE.asInt();
    private int maxEnchantments = Setting.MAX_ENCHANTMENTS.asInt();
    private boolean dropItem = Setting.DROP_ITEM.asBoolean();
    private boolean disableCoolDown = Setting.DISABLE_COOLDOWN.asBoolean();
    private boolean disableDelay = Setting.DISABLE_DELAY.asBoolean();

    public BlacksmithTrait() {
        super("blacksmith");
        plugin = (BlacksmithPlugin) Bukkit.getServer().getPluginManager().getPlugin("Blacksmith");
        int i = 0;
        for (Enchantment enchantment : Enchantment.values()) {
            enchantments[i++] = enchantment.getKey().asString();
        }
    }

    @Override
    public void load(DataKey key) {
        for (DataKey sub : key.getRelative("reforgeable-items").getIntegerSubKeys()) {
            if (Material.getMaterial(sub.getString("").toUpperCase().replace('-', '_')) != null) {
                reforgeAbleItems.add(Material.getMaterial(sub.getString("").toUpperCase().replace('-', '_')));
            }
        }

        // Override defaults if they exist
        if (key.keyExists("messages.busy-with-player")) {
            busyWithPlayerMsg = key.getString("messages.busy-with-player");
        }
        if (key.keyExists("messages.busy-with-reforge")) {
            busyReforgingMsg = key.getString("messages.busy-with-reforge");
        }
        if (key.keyExists("messages.cost")) {
            costMsg = key.getString("messages.cost");
        }
        if (key.keyExists("messages.invalid-item")) {
            invalidItemMsg = key.getString("messages.invalid-item");
        }
        if (key.keyExists("messages.start-reforge")) {
            startReforgeMsg = key.getString("messages.start-reforge");
        }
        if (key.keyExists("messages.successful-reforge")) {
            successMsg = key.getString("messages.successful-reforge");
        }
        if (key.keyExists("messages.fail-reforge")) {
            failMsg = key.getString("messages.fail-reforge");
        }
        if (key.keyExists("messages.insufficient-funds")) {
            insufficientFundsMsg = key.getString("messages.insufficient-funds");
        }
        if (key.keyExists("messages.cooldown-not-expired")) {
            coolDownUnexpiredMessage = key.getString("messages.cooldown-not-expired");
        }
        if (key.keyExists("messages.item-changed-during-reforge")) {
            itemChangedMsg = key.getString("messages.item-changed-during-reforge");
        }
        if (key.keyExists("delays-in-seconds.minimum")) {
            minReforgeDelay = key.getInt("delays-in-seconds.minimum");
        }
        if (key.keyExists("delays-in-seconds.maximum")) {
            maxReforgeDelay = key.getInt("delays-in-seconds.maximum");
        }
        if (key.keyExists("delays-in-seconds.reforge-cooldown")) {
            reforgeCoolDown = key.getInt("delays-in-seconds.reforge-cooldown");
        }
        if (key.keyExists("percent-chance-to-fail-reforge")) {
            failChance = key.getInt("percent-chance-to-fail-reforge");
        }
        if (key.keyExists("maximum-enchantments")) {
            maxEnchantments = key.getInt("maximum-enchantments");
        }
        if (key.keyExists("extra-enchantments-chance")) {
            extraEnchantmentChance = key.getInt("extra-enchantment-chance");
        }
        if (key.keyExists("dropitem")) {
            dropItem = key.getBoolean("dropitem");
        }
        if (key.keyExists("disable-cooldown")) {
            disableCoolDown = key.getBoolean("disable-cooldown");
        }
        if (key.keyExists("disable-delay")) {
            disableDelay = key.getBoolean("disable-delay");
        }
    }

    @EventHandler
    public void onRightClick(net.citizensnpcs.api.event.NPCRightClickEvent event) {
        if (this.npc != event.getNPC()) {
            return;
        }

        Player player = event.getClicker();
        if ((disableCoolDown & (coolDowns.get(player.getName()) != (null)))) {
            coolDowns.remove(player.getName());
        }
        if (!player.hasPermission("blacksmith.reforge")) {
            return;
        }

        if (coolDowns.get(player.getName()) != null) {
            if (!Calendar.getInstance().after(coolDowns.get(player.getName()))) {
                player.sendMessage(coolDownUnexpiredMessage);
                return;
            }
            coolDowns.remove(player.getName());
        }


        ItemStack hand = player.getInventory().getItemInMainHand();

        if (session != null) {
            //timeout
            if (System.currentTimeMillis() > _sessionstart + 10 * 1000 || this.npc.getEntity().getLocation().distance(session.player.getLocation()) > 20) {
                session = null;
            }
        }


        if (session != null) {
            if (!session.isInSession(player)) {

                player.sendMessage(busyWithPlayerMsg);
                return;

            }

            if (session.isRunning()) {
                player.sendMessage(busyReforgingMsg);
                return;
            }
            if (session.handleClick()) {
                session = null;
            } else {
                reforge(npc, player);
            }
        } else {
            if ((!plugin.isTool(hand) && !plugin.isArmor(hand))
                    || (!reforgeAbleItems.isEmpty() && !reforgeAbleItems.contains(hand.getType()))) {
                player.sendMessage(invalidItemMsg);
                return;
            }

            String cost = plugin.formatCost(player);

            _sessionstart = System.currentTimeMillis();
            session = new ReforgeSession(player, npc);
            player.sendMessage(costMsg.replace("<price>", cost).replace("<item>",
                    hand.getType().name().toLowerCase().replace('_', ' ')));

        }
    }

    private long _sessionstart = System.currentTimeMillis();

    @Override
    public void save(DataKey key) {
        for (int i = 0; i < reforgeAbleItems.size(); i++) {
            key.getRelative("reforgeable-items").setString(String.valueOf(i),
                    reforgeAbleItems.get(i).name().toLowerCase().replace('_', '-'));
        }

        key.setString("messages.busy-with-player", busyWithPlayerMsg);
        key.setString("messages.busy-with-reforge", busyReforgingMsg);
        key.setString("messages.cost", costMsg);
        key.setString("messages.invalid-item", invalidItemMsg);
        key.setString("messages.start-reforge", startReforgeMsg);
        key.setString("messages.successful-reforge", successMsg);
        key.setString("messages.fail-reforge", failMsg);
        key.setString("messages.insufficient-funds", insufficientFundsMsg);
        key.setString("messages.cooldown-not-expired", coolDownUnexpiredMessage);
        key.setString("messages.item-changed-during-reforge", itemChangedMsg);
        key.setInt("delays-in-seconds.minimum", minReforgeDelay);
        key.setInt("delays-in-seconds.maximum", maxReforgeDelay);
        key.setInt("delays-in-seconds.reforge-cooldown", reforgeCoolDown);
        key.setInt("percent-chance-to-fail-reforge", failChance);
        key.setInt("percent-chance-for-extra-enchantment", extraEnchantmentChance);
        key.setInt("maximum-enchantments", maxEnchantments);
        key.setBoolean("drop-item", dropItem);
        key.setBoolean("disable-delay", disableDelay);
        key.setBoolean("disable-cooldown", disableCoolDown);
    }

    private void reforge(NPC npc, Player player) {
        player.sendMessage(startReforgeMsg);

        //plugin.deposit(npc, player); // CitiTrader dependency outdated and broken

        plugin.withdraw(player);
        session.beginReforge();
        if (npc.getEntity() instanceof Player) {
            ((Player) npc.getEntity()).getInventory().setItemInMainHand(player.getInventory().getItemInMainHand());
        } else {
            Objects.requireNonNull(((LivingEntity) npc.getEntity()).getEquipment()).setItemInMainHand(player.getInventory().getItemInMainHand());
        }
        player.getInventory().setItemInMainHand(null);
    }

    private class ReforgeSession implements Runnable {
        private final Player player;
        private final NPC npc;
        private final ItemStack reforge;
        private int taskId;

        private ReforgeSession(Player player, NPC npc) {
            this.player = player;
            this.npc = npc;
            reforge = player.getInventory().getItemInMainHand();
        }

        @Override
        public void run() {
            player.sendMessage(reforgeItemInHand() ? successMsg : failMsg);
            if (npc.getEntity() instanceof Player) {
                ((Player) npc.getEntity()).getInventory().setItemInMainHand(null);
            } else {
                Objects.requireNonNull(((LivingEntity) npc.getEntity()).getEquipment()).setItemInMainHand(null);
            }
            if (!disableDelay) {
                if (dropItem) {
                    player.getWorld().dropItemNaturally(npc.getEntity().getLocation(), reforge);
                } else {
                    player.getInventory().addItem(reforge);
                }
            } else {
                player.getInventory().setItemInMainHand(reforge);
            }
            session = null;
            // Start cooldown
            Calendar wait = Calendar.getInstance();
            wait.add(Calendar.SECOND, reforgeCoolDown);
            coolDowns.put(player.getName(), wait);
        }

        private boolean reforgeItemInHand() {
            Random random = new Random();
            if (random.nextInt(100) < failChance) {
                for (Enchantment enchantment : reforge.getEnchantments().keySet()) {
                    // Remove or downgrade enchantments
                    if (random.nextBoolean()) {
                        reforge.removeEnchantment(enchantment);
                    } else {
                        if (reforge.getEnchantmentLevel(enchantment) > 1) {
                            reforge.removeEnchantment(enchantment);
                            reforge.addEnchantment(enchantment, 1);
                        }
                    }
                }
                // Damage the item
                short durability = (short) (((Damageable) reforge).getDamage() + ((Damageable) reforge).getDamage() *
                        random.nextInt(8));
                short maxDurability = reforge.getType().getMaxDurability();
                if (durability <= 0) {
                    durability = (short) (maxDurability / 3);
                } else if (((Damageable) reforge).getDamage() + durability > maxDurability) {
                    durability = (short) (maxDurability - random.nextInt(maxDurability - 25));
                }
                ((Damageable) reforge).setDamage(durability);
                return false;
            }

            ((Damageable) reforge).setDamage((short) 0);

            // Add random enchantments


            // If durability is full, chance is multiplied by 4. Seems unbalanced, so disabled for now.
			/*if (reforge.getDurability() == 0)
            	chance *= 4;
            else */

            int roll = random.nextInt(100);
            if (roll < extraEnchantmentChance && reforge.getEnchantments().keySet().size() < maxEnchantments) {

                Enchantment enchantment = Enchantment.getByKey(NamespacedKey.fromString(enchantments[random.nextInt(enchantments.length)]));
                if (Objects.requireNonNull(enchantment).canEnchantItem(reforge)) {
                    reforge.addEnchantment(enchantment, random.nextInt(enchantment.getMaxLevel() - enchantment.getStartLevel()) + enchantment.getStartLevel());
                }

            }

            return true;
        }

        // Return if the session should end
        private boolean handleClick() {
            // Prevent player from switching items during session
            if (!reforge.equals(player.getInventory().getItemInMainHand())) {
                player.sendMessage(itemChangedMsg);
                return true;
            }
            if (!plugin.doesPlayerHaveEnough(player)) {
                player.sendMessage(insufficientFundsMsg);
                return true;
            }
            return false;
        }

        private boolean isRunning() {
            return plugin.getServer().getScheduler().isQueued(taskId);
        }

        private boolean isInSession(Player other) {
            return player.getName().equals(other.getName());
        }

        private void beginReforge() {
            if (!disableCoolDown) {
                taskId = plugin
                        .getServer()
                        .getScheduler()
                        .scheduleSyncDelayedTask(plugin, this,
                                (new Random().nextInt(maxReforgeDelay) + minReforgeDelay) * 20L);
            } else {
                taskId = plugin
                        .getServer()
                        .getScheduler()
                        .scheduleSyncDelayedTask(plugin, this, 0);
            }
        }
    }
}