package nl.iobyte.themepark.menu;

import com.google.common.collect.Iterables;
import nl.iobyte.menuapi.components.Types;
import nl.iobyte.menuapi.item.MenuItem;
import nl.iobyte.menuapi.multi.MenuPage;
import nl.iobyte.menuapi.multi.MultiMenu;
import nl.iobyte.themepark.ThemeParkPlugin;
import nl.iobyte.themepark.api.API;
import nl.iobyte.themepark.api.attraction.Attraction;
import nl.iobyte.themepark.api.attraction.Region;
import nl.iobyte.themepark.api.attraction.manager.StatusManager;
import nl.iobyte.themepark.api.utils.ItemBuilder;
import nl.iobyte.themepark.menu.actions.PageAction;
import nl.iobyte.themepark.menu.actions.TPAction;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;

public class AttractionMenu {

    private static MultiMenu menu;
    private static HashMap<String, Integer> reg_slots = new HashMap<>();
    private static HashMap<String, Integer> att_slots = new HashMap<>();

    public static void load() {
        LinkedHashMap<Integer, Region> regions = new LinkedHashMap<>();
        LinkedHashMap<Integer, List<Attraction>> attractions = new LinkedHashMap<>();
        for(Region region : API.getRegions().values()) {
            if(region.getAttractions().isEmpty()) {
                regions.put(regions.size(), region);
                continue;
            }

            Iterable<List<Attraction>> iterable = Iterables.partition(region.getAttractions().values(), 8);
            for(List<Attraction> list : iterable) {
                regions.put(regions.size(), region);
                attractions.put(attractions.size(), list);
            }
        }

        int region_size = regions.size();
        loadMenu(region_size);
        for(int i = 0; i < region_size; i++) {
            int start_index = i * 9;
            if(region_size > 6)
                start_index += (i / 5) * 9;

            int j = 1;
            List<Attraction> list = attractions.get(i);
            Region region = regions.get(i);
            if(region == null)
                continue;

            reg_slots.put(region.getId(), start_index);
            menu.setItem(start_index, new MenuItem(getRegion(region), true));
            if(list == null)
                continue;

            for(Attraction attraction : list) {
                MenuItem item = new MenuItem(getAttraction(attraction), true);
                item.addActions(Types.NORMAL.getTypesList(), new TPAction(attraction));

                int slot = start_index + j;
                att_slots.put(attraction.getId(), slot);
                menu.setItem(slot, item);
                j++;
            }
        }

        if(region_size > 6) {
            int page_size = menu.getPageSizes().size();
            for (int i = 0; i < page_size; i++) {
                MenuPage page = menu.getPage(i + 1);
                int size = page.getSize();
                if (i > 0)
                    page.setItem(size - 6, getPrevious(i));

                if (i < (page_size - 1))
                    page.setItem(size - 4, getNext(i));

                ItemBuilder builder = new ItemBuilder(Material.MINECART);
                builder.setName("&6Page: &f"+(i + 1));
                page.setItem(size - 5, new MenuItem(builder.getItem(), true));
            }
        }

        menu.build();
    }

    public static void updateRegion(Region region) {
        if(region == null)
            return;

        if(!reg_slots.containsKey(region.getId()))
            return;

        int slot = reg_slots.get(region.getId());
        menu.setItem(slot, getRegion(region));
        menu.updateItem(slot);
    }

    public static void updateAttraction(Attraction attraction) {
        if(attraction == null)
            return;

        if(!att_slots.containsKey(attraction.getId()))
            return;

        int slot = att_slots.get(attraction.getId());
        menu.setItem(slot, getAttraction(attraction));
        menu.updateItem(slot);
    }

    public static void open(Player player) {
        open(player, 1);
    }

    public static void open(Player player, int page) {
        menu.open(player, page);
    }

    private static void loadMenu(int regions) {
        ArrayList<Integer> page_sizes = new ArrayList<>();
        if(regions <= 6) {
            page_sizes.add(regions * 9);
        } else {
            int pages = regions / 5;
            for (int i = 0; i < pages; i++)
                page_sizes.add(54);

            pages = regions % 5;
            if (pages > 0)
                page_sizes.add(pages * 9 + 9);
        }

        menu = new MultiMenu(ThemeParkPlugin.getInstance().getSettings().getConfig().getString("menu-title"), page_sizes);
    }

    private static ItemStack getRegion(Region region) {
        ItemBuilder builder = new ItemBuilder(region.getMaterial(), 1, region.getData());
        builder.setName(region.getName()).setLore(region.getLore());
        return builder.getItem();
    }

    private static ItemStack getAttraction(Attraction attraction) {
        ItemBuilder builder = new ItemBuilder(StatusManager.getMaterial(attraction.getStatus()), 1, StatusManager.getData(attraction.getStatus()));
        builder.setName(attraction.getName()).setLore(StatusManager.getName(attraction.getStatus()));
        return builder.getItem();
    }

    private static MenuItem getNext(int page) {
        return getPage("&6&LNext \u23F5", page + 1);
    }

    private static MenuItem getPrevious(int page) {
        return getPage("&6&L\u23F4 Previous", page - 1);
    }

    private static MenuItem getPage(String text, int page) {
        ItemBuilder builder = new ItemBuilder(Material.ARROW);
        builder.setName(text);

        MenuItem item = new MenuItem(builder.getItem(), true);
        item.addActions(new PageAction(page + 1));
        return item;
    }

}