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Library for easy creation of GUIs for Bukkit plugins.
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/**
 * MIT License
 *
 * Copyright (c) 2021 TriumphTeam
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package dev.triumphteam.gui.components.util;

import com.google.common.primitives.Ints;
import dev.triumphteam.gui.components.exception.GuiException;
import org.bukkit.Bukkit;
import org.bukkit.OfflinePlayer;
import org.bukkit.inventory.meta.ItemMeta;
import org.jetbrains.annotations.NotNull;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Class for detecting server version for legacy support :(
 */
public final class VersionHelper {

    private static final String CRAFTBUKKIT_PACKAGE = Bukkit.getServer().getClass().getPackage().getName();

    // Unbreakable change
    private static final int V1_11 = 1110;
    // Material and components on items change
    private static final int V1_13 = 1130;
    // PDC and customModelData
    private static final int V1_14 = 1140;
    // Paper adventure changes
    private static final int V1_16_5 = 1165;
    // SkullMeta#setOwningPlayer was added
    private static final int V1_12_1 = 1121;
    // PlayerProfile API
    private static final int V1_20_1 = 1201;
    private static final int V1_20_5 = 1205;

    private static final int CURRENT_VERSION = getCurrentVersion();
    /**
     * Checks if the version supports Components or not
     * Spigot always false
     */
    public static final boolean IS_COMPONENT_LEGACY = CURRENT_VERSION < V1_16_5;
    /**
     * Checks if the version is lower than 1.13 due to the item changes
     */
    public static final boolean IS_ITEM_LEGACY = CURRENT_VERSION < V1_13;
    /**
     * Checks if the version supports the {@link org.bukkit.inventory.meta.ItemMeta#setUnbreakable(boolean)} method
     */
    public static final boolean IS_UNBREAKABLE_LEGACY = CURRENT_VERSION < V1_11;
    /**
     * Checks if the version supports {@link org.bukkit.persistence.PersistentDataContainer}
     */
    public static final boolean IS_PDC_VERSION = CURRENT_VERSION >= V1_14;
    /**
     * Checks if the version doesn't have {@link org.bukkit.inventory.meta.SkullMeta#setOwningPlayer(OfflinePlayer)} and
     * {@link org.bukkit.inventory.meta.SkullMeta#setOwner(String)} should be used instead
     */
    public static final boolean IS_SKULL_OWNER_LEGACY = CURRENT_VERSION < V1_12_1;
    /**
     * Checks if the version has {@link org.bukkit.inventory.meta.ItemMeta#setCustomModelData(Integer)}
     */
    public static final boolean IS_CUSTOM_MODEL_DATA = CURRENT_VERSION >= V1_14;
    /**
     * Checks if the version has {@link org.bukkit.profile.PlayerProfile}
     */
    public static final boolean IS_PLAYER_PROFILE_API = CURRENT_VERSION >= V1_20_1;
    /**
     * Starting with version 1.20.5 the internal field referenced by {@link ItemMeta#getDisplayName()} is no longer a string
     */
    public static final boolean IS_ITEM_NAME_COMPONENT = CURRENT_VERSION >= V1_20_5;
    private static final boolean IS_PAPER = checkPaper();
    public static final boolean IS_FOLIA = checkFolia();

    /**
     * Check if the server has access to the Paper API
     * Taken from PaperLib
     *
     * @return True if on Paper server (or forks), false anything else
     */
    private static boolean checkPaper() {
        try {
            Class.forName("com.destroystokyo.paper.PaperConfig");
            return true;
        } catch (ClassNotFoundException ignored) {
            return false;
        }
    }

    /**
     * Check if the server has access to the Folia API
     * Taken from Folia
     *
     * @return True if on Folia server (or forks), false anything else
     */
    private static boolean checkFolia() {
        try {
            Class.forName("io.papermc.paper.threadedregions.RegionizedServer");
            return true;
        } catch (ClassNotFoundException ignored) {
            return false;
        }
    }

    /**
     * Gets the current server version
     *
     * @return A protocol like number representing the version, for example, 1.16.5 -> 1165
     */
    private static int getCurrentVersion() {
        // No need to cache since will only run once
        final Matcher matcher = Pattern.compile("(?\\d+\\.\\d+)(?\\.\\d+)?").matcher(Bukkit.getBukkitVersion());

        final StringBuilder stringBuilder = new StringBuilder();
        if (matcher.find()) {
            stringBuilder.append(matcher.group("version").replace(".", ""));
            final String patch = matcher.group("patch");
            if (patch == null) stringBuilder.append("0");
            else stringBuilder.append(patch.replace(".", ""));
        }

        //noinspection UnstableApiUsage
        final Integer version = Ints.tryParse(stringBuilder.toString());

        // Should never fail
        if (version == null) throw new GuiException("Could not retrieve server version!");

        return version;
    }

    public static Class craftClass(@NotNull final String name) throws ClassNotFoundException {
        return Class.forName(CRAFTBUKKIT_PACKAGE + "." + name);
    }

}