HolographicDisplays/core/src/main/java/me/filoghost/holographicdisplays/core/NMSVersion.java

/*
 * Copyright (C) filoghost and contributors
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */
package me.filoghost.holographicdisplays.core;

import me.filoghost.fcommons.logging.ErrorCollector;
import me.filoghost.holographicdisplays.nms.common.NMSManager;
import org.bukkit.Bukkit;

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

/**
 * The package name used by version-dependent Bukkit classes and NMS classes (before 1.17), for example "v1_13_R2".
 * Different versions usually imply internal changes that require multiple implementations.
 */
public enum NMSVersion {

    // Not using shorter method reference syntax here because it initializes the class, causing a ClassNotFoundException

    /* 1.8 - 1.8.2     */ v1_8_R1(NMSManagerFactory.outdatedVersion("1.8.4")),
    /* 1.8.3           */ v1_8_R2(NMSManagerFactory.outdatedVersion("1.8.4")),
    /* 1.8.4 - 1.8.9   */ v1_8_R3(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_8_R3.VersionNMSManager(errorCollector)),
    /* 1.9 - 1.9.3     */ v1_9_R1(NMSManagerFactory.outdatedVersion("1.9.4")),
    /* 1.9.4           */ v1_9_R2(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_9_R2.VersionNMSManager(errorCollector)),
    /* 1.10 - 1.10.2   */ v1_10_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_10_R1.VersionNMSManager(errorCollector)),
    /* 1.11 - 1.11.2   */ v1_11_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_11_R1.VersionNMSManager(errorCollector)),
    /* 1.12 - 1.12.2   */ v1_12_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_12_R1.VersionNMSManager(errorCollector)),
    /* 1.13            */ v1_13_R1(NMSManagerFactory.outdatedVersion("1.13.1")),
    /* 1.13.1 - 1.13.2 */ v1_13_R2(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_13_R2.VersionNMSManager(errorCollector)),
    /* 1.14 - 1.14.4   */ v1_14_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_14_R1.VersionNMSManager(errorCollector)),
    /* 1.15 - 1.15.2   */ v1_15_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_15_R1.VersionNMSManager(errorCollector)),
    /* 1.16 - 1.16.1   */ v1_16_R1(NMSManagerFactory.outdatedVersion("1.16.4")),
    /* 1.16.2 - 1.16.3 */ v1_16_R2(NMSManagerFactory.outdatedVersion("1.16.4")),
    /* 1.16.4 - 1.16.5 */ v1_16_R3(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_16_R3.VersionNMSManager(errorCollector)),
    /* 1.17            */ v1_17_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_17_R1.VersionNMSManager(errorCollector)),
    /* 1.18 - 1.18.1   */ v1_18_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_18_R1.VersionNMSManager(errorCollector)),
    /* 1.18.2          */ v1_18_R2(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_18_R2.VersionNMSManager(errorCollector)),
    /* 1.19 - 1.19.2   */ v1_19_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_19_R1.VersionNMSManager(errorCollector)),
    /* 1.19.3          */ v1_19_R2(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_19_R2.VersionNMSManager(errorCollector)),
    /* 1.19.4          */ v1_19_R3(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_19_R3.VersionNMSManager(errorCollector)),
    /* 1.20 - 1.20.1   */ v1_20_R1(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_20_R1.VersionNMSManager(errorCollector)),
    /* 1.20.2          */ v1_20_R2(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_20_R2.VersionNMSManager(errorCollector)),
    /* 1.20.3 - 1.20.4 */ v1_20_R3(errorCollector -> new me.filoghost.holographicdisplays.nms.v1_20_R3.VersionNMSManager(errorCollector)),
    /* Other versions  */ UNKNOWN(NMSManagerFactory.unknownVersion());

    private static final NMSVersion CURRENT_VERSION = detectCurrentVersion();

    private final NMSManagerFactory nmsManagerFactory;

    NMSVersion(NMSManagerFactory nmsManagerFactory) {
        this.nmsManagerFactory = nmsManagerFactory;
    }

    public NMSManager createNMSManager(ErrorCollector errorCollector) throws OutdatedVersionException, UnknownVersionException {
        return nmsManagerFactory.create(errorCollector);
    }

    public static NMSVersion getCurrent() {
        return CURRENT_VERSION;
    }

    private static NMSVersion detectCurrentVersion() {
        Matcher matcher = Pattern.compile("v\\d+_\\d+_R\\d+").matcher(Bukkit.getServer().getClass().getPackage().getName());
        if (!matcher.find()) {
            return UNKNOWN;
        }

        String nmsVersionName = matcher.group();
        try {
            return valueOf(nmsVersionName);
        } catch (IllegalArgumentException e) {
            return UNKNOWN;
        }
    }


    @FunctionalInterface
    private interface NMSManagerFactory {

        NMSManager create(ErrorCollector errorCollector) throws UnknownVersionException, OutdatedVersionException;

        static NMSManagerFactory unknownVersion() {
            return errorCollector -> {
                throw new UnknownVersionException();
            };
        }

        static NMSManagerFactory outdatedVersion(String minimumSupportedVersion) {
            return errorCollector -> {
                throw new OutdatedVersionException(minimumSupportedVersion);
            };
        }

    }

    public static class UnknownVersionException extends Exception {}

    public static class OutdatedVersionException extends Exception {

        private final String minimumSupportedVersion;

        public OutdatedVersionException(String minimumSupportedVersion) {
            this.minimumSupportedVersion = minimumSupportedVersion;
        }

        public String getMinimumSupportedVersion() {
            return minimumSupportedVersion;
        }

    }

}