package com.alttd.easter.gui;

import com.alttd.easter.config.Config;
import com.alttd.easter.config.Messages;
import com.alttd.easter.data.DataManager;
import com.alttd.easter.egg.EggType;
import com.alttd.easter.util.ItemUtils;
import lombok.extern.slf4j.Slf4j;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.JoinConfiguration;
import net.kyori.adventure.text.minimessage.MiniMessage;
import net.kyori.adventure.text.minimessage.tag.resolver.Placeholder;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;

import java.util.*;

@Slf4j
public class TurnInGuiManager implements Listener {

    private final DataManager dataManager;
    private final Map<UUID, Inventory> openInventories = new HashMap<>();

    public TurnInGuiManager(DataManager dataManager) {
        this.dataManager = dataManager;
    }

    private Component title() {
        return MiniMessage.miniMessage().deserialize(Messages.RABBIT.GUI_TITLE);
    }

    public void open(Player player) {
        Inventory inv = Bukkit.createInventory(player, 27, title());
        openInventories.put(player.getUniqueId(), inv);
        player.openInventory(inv);
    }

    @EventHandler
    public void onClick(InventoryClickEvent event) {
        if (!(event.getWhoClicked() instanceof Player player)) {
            return;
        }
        Inventory top = openInventories.get(player.getUniqueId());
        if (top == null) {
            return;
        }
        if (!event.getView().getTopInventory().equals(top)) {
            return;
        }

        // If clicking in player inventory with shift-click, prevent moving non-egg items into GUI
        if (event.isShiftClick() && event.getClickedInventory() != null && event.getClickedInventory().equals(player.getInventory())) {
            ItemStack stack = event.getCurrentItem();
            if (stack != null && !stack.getType().isAir() && !ItemUtils.isEggItem(stack)) {
                event.setCancelled(true);
                return;
            }
        }

        // If placing an item into the GUI (cursor over top inventory), only allow egg items
        boolean inTop = event.getRawSlot() < top.getSize() && event.getRawSlot() >= 0;
        if (inTop) {
            ItemStack cursor = event.getCursor();
            if (!cursor.getType().isAir() && !ItemUtils.isEggItem(cursor)) {
                event.setCancelled(true);
            }
        }
    }

    @EventHandler
    public void onClose(InventoryCloseEvent event) {
        Player player = (Player) event.getPlayer();
        Inventory top = openInventories.get(player.getUniqueId());
        if (top == null) {
            return;
        }
        if (!event.getView().getTopInventory().equals(top)) {
            return;
        }

        openInventories.remove(player.getUniqueId());

        // collect egg items for submission and then clear GUI so eggs don't drop
        Set<EggType> submitted = new HashSet<>();
        for (ItemStack item : top.getContents()) {
            if (ItemUtils.isEggItem(item)) {
                EggType type = ItemUtils.getEggType(item);
                if (type != null) {
                    submitted.add(type);
                }
            }
        }
        top.clear();
        if (submitted.isEmpty()) {
            player.sendRichMessage(Messages.RABBIT.NO_EGGS);
            return;
        }
        // determine how many new unique egg types were added so we can award correct number of prizes
        int prevTotal = dataManager.getPlayerEggs(player.getUniqueId()).size();
        int newlyAdded = dataManager.addEggs(player.getUniqueId(), submitted);
        dataManager.save();
        // Dialog formatting for submission summary
        List<Component> eggComponents = new ArrayList<>();
        for (EggType type : submitted) {
            eggComponents.add(Component.text(ItemUtils.colorName(type)));
        }
        if (eggComponents.size() == 1) {
            player.sendRichMessage(Messages.RABBIT.ONE_EGG,
                                   Placeholder.parsed("player", player.getName()),
                                   Placeholder.component("egg1", eggComponents.getFirst())
                                  );
        } else {
            Component eggsJoined;
            if (eggComponents.size() == 2) {
                eggsJoined = Component.join(
                        JoinConfiguration.builder()
                                .lastSeparator(Component.text(" and "))
                                .build(),
                        eggComponents
                );
            } else {
                eggsJoined = Component.join(
                        JoinConfiguration.builder()
                                .separator(Component.text(", "))
                                .lastSeparator(Component.text(", and "))
                                .build(),
                        eggComponents
                );
            }
            player.sendRichMessage(Messages.RABBIT.MULTI_EGGS,
                                   Placeholder.parsed("player", player.getName()),
                                   Placeholder.component("eggs", eggsJoined)
                                  );
        }
        int newTotal = prevTotal + newlyAdded;
        int prevMilestones = prevTotal / 4;
        int newMilestones = newTotal / 4;
        int prizesToGive = Math.max(0, newMilestones - prevMilestones);
        List<ItemStack> prizeList = Config.PRIZES.LIST;
        for (int i = 0; i < prizesToGive; i++) {
            int intendedIndex = prevMilestones + i;
            if (prizeList.isEmpty()) {
                log.warn("No prizes configured. Tried to give prize for intended index {}. Staff should configure prizes using /easter setprize.", intendedIndex);
            } else {
                int wrappedIndex = intendedIndex % prizeList.size();
                if (intendedIndex >= prizeList.size() || intendedIndex < 0) {
                    log.warn("Prize index overflow: intended index {} -> wrapped to {} (prize list size {}).", intendedIndex, wrappedIndex, prizeList.size());
                }
                ItemStack prize = prizeList.get(wrappedIndex).clone();
                player.getInventory().addItem(prize);
            }
            player.sendRichMessage(Messages.RABBIT.REWARD);
        }
    }
}