package tokarotik.giftapi.inventory;

import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import tokarotik.giftapi.cache.CacheManager;
import tokarotik.giftapi.NBT.pages.PagesManager;
import tokarotik.giftapi.inventory.inventoryitems.InventoryItems;

public class InventoryUtil
{
    private final CacheManager cacheManager;
    private final InventoryItems inventoryItems;
    private final String nameGUI;
    private final String nameArrowRight;
    private final String nameArrowLeft;
    private final String nameExit;
    private final int inventory_slots;

    public InventoryUtil(CacheManager cacheManager, String nameGUI, String nameArrowRight, String nameArrowLeft, String nameExit, int inventory_slots)
    {
        this.cacheManager = cacheManager;
        this.nameGUI = nameGUI;
        this.nameArrowRight = nameArrowRight;
        this.nameArrowLeft = nameArrowLeft;
        this.nameExit = nameExit;
        this.inventory_slots = inventory_slots;
        this.inventoryItems = new InventoryItems(inventory_slots);
    }

    public void onInventoryClick(InventoryClickEvent event)
    {
        Inventory inventory = event.getInventory();

        if (inventory.getTitle().equals(this.nameGUI)) {
            event.setCancelled(true);

            ItemStack currentItem = event.getCurrentItem();

            if (currentItem == null) { return; }
            String nameCurrentItem = null;
            if (currentItem.hasItemMeta()) {
                if (currentItem.getItemMeta().hasDisplayName()) {
                    nameCurrentItem = currentItem.getItemMeta().getDisplayName();
                }
            }

            Player player = (Player) event.getWhoClicked();

            if (!nameCurrentItem.isEmpty())
            {
                if (nameCurrentItem.equals(this.nameArrowRight)) {
                    PagesManager pagesManager = this.cacheManager.load(player);

                    if (pagesManager.getCountPages() > pagesManager.getCurrentPage())
                    {
                        pagesManager.nextPage();
                        updateInventory(inventory, player);
                    }
                }

                if (nameCurrentItem.equals(this.nameArrowLeft)) {
                    PagesManager pagesManager = this.cacheManager.load(player);

                    if (0 < pagesManager.getCurrentPage())
                    {
                        pagesManager.backPage();
                        updateInventory(inventory, player);
                    }
                }

                if (nameCurrentItem.equals(this.nameExit)) {
                    player.closeInventory();
                }
            }
        }
    }

    public synchronized void updateInventory(Inventory inventory, Player player)
    {
        PagesManager pagesManager = this.cacheManager.load(player);

        setUI(inventory, pagesManager);
        this.inventoryItems.renderPage(pagesManager, inventory);
    }

    private synchronized void setUI(Inventory inventory, PagesManager pagesManager)
    {
        int height =  (this.inventory_slots / 9) + 1;

        // exit
        setItem(inventory, Material.REDSTONE, this.nameExit, 4, height);
        if (pagesManager.getCountPages() == 0) { return; }

        if (pagesManager.getCurrentPage() != pagesManager.getCountPages())
        {
            // arrow right
            setArrow(inventory, this.nameArrowRight, 8, height);
        }

        if (pagesManager.getCurrentPage() != 0)
        {
            // arrow left
            setArrow(inventory, this.nameArrowLeft, 0, height);
        }


    }

    private synchronized void setItem(Inventory inventory, Material material, String name, int x, int y)
    {
        ItemStack item = new ItemStack(material, 1);
        ItemMeta meta_item = item.getItemMeta();

        meta_item.setDisplayName(name);
        item.setItemMeta(meta_item);

        inventory.setItem(
                getCordinates(x, y),
                item
        );
    }

    private  synchronized void setArrow(Inventory inventory, String name, int x, int y)
    {
        setItem(inventory, Material.ARROW, name, x, y);
    }

    public synchronized int getCordinates(int x, int y)
    {
        if (y == 0) {y++;}
        return ((y - 1) * 9 + x) % (this.inventory_slots + 9);
    }
}