package com.comphenix.protocol.utility;

import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.TreeMap;

/**
 * A lookup of the associated protocol version of a given Minecraft server.
 *
 * @author Kristian
 */
public final class MinecraftProtocolVersion {

	private static final NavigableMap<MinecraftVersion, Integer> LOOKUP = createLookup();

	private static NavigableMap<MinecraftVersion, Integer> createLookup() {
		TreeMap<MinecraftVersion, Integer> map = new TreeMap<>();

		// Source: http://wiki.vg/Protocol_version_numbers
		// Doesn't include pre-releases
		map.put(new MinecraftVersion(1, 0, 0), 22);
		map.put(new MinecraftVersion(1, 1, 0), 23);
		map.put(new MinecraftVersion(1, 2, 2), 28);
		map.put(new MinecraftVersion(1, 2, 4), 29);
		map.put(new MinecraftVersion(1, 3, 1), 39);
		map.put(new MinecraftVersion(1, 4, 2), 47);
		map.put(new MinecraftVersion(1, 4, 3), 48);
		map.put(new MinecraftVersion(1, 4, 4), 49);
		map.put(new MinecraftVersion(1, 4, 6), 51);
		map.put(new MinecraftVersion(1, 5, 0), 60);
		map.put(new MinecraftVersion(1, 5, 2), 61);
		map.put(new MinecraftVersion(1, 6, 0), 72);
		map.put(new MinecraftVersion(1, 6, 1), 73);
		map.put(new MinecraftVersion(1, 6, 2), 74);
		map.put(new MinecraftVersion(1, 6, 4), 78);

		// After Netty
		map.put(new MinecraftVersion(1, 7, 1), 4);
		map.put(new MinecraftVersion(1, 7, 6), 5);

		map.put(new MinecraftVersion(1, 8, 0), 47);

		map.put(new MinecraftVersion(1, 9, 0), 107);
		map.put(new MinecraftVersion(1, 9, 2), 109);
		map.put(new MinecraftVersion(1, 9, 4), 110);

		map.put(new MinecraftVersion(1, 10, 0), 210);

		map.put(new MinecraftVersion(1, 11, 0), 315);
		map.put(new MinecraftVersion(1, 11, 1), 316);

		map.put(new MinecraftVersion(1, 12, 0), 335);
		map.put(new MinecraftVersion(1, 12, 1), 338);
		map.put(new MinecraftVersion(1, 12, 2), 340);

		map.put(new MinecraftVersion(1, 13, 0), 393);
		map.put(new MinecraftVersion(1, 13, 1), 401);
		map.put(new MinecraftVersion(1, 13, 2), 404);

		map.put(new MinecraftVersion(1, 14, 0), 477);
		map.put(new MinecraftVersion(1, 14, 1), 480);
		map.put(new MinecraftVersion(1, 14, 2), 485);
		map.put(new MinecraftVersion(1, 14, 3), 490);
		map.put(new MinecraftVersion(1, 14, 4), 498);

		map.put(new MinecraftVersion(1, 15, 0), 573);
		map.put(new MinecraftVersion(1, 15, 1), 575);
		map.put(new MinecraftVersion(1, 15, 2), 578);

		map.put(new MinecraftVersion(1, 16, 0), 735);
		map.put(new MinecraftVersion(1, 16, 1), 736);
		map.put(new MinecraftVersion(1, 16, 2), 751);
		map.put(new MinecraftVersion(1, 16, 3), 753);
		map.put(new MinecraftVersion(1, 16, 4), 754);
		map.put(new MinecraftVersion(1, 16, 5), 754);

		map.put(new MinecraftVersion(1, 17, 0), 755);
		map.put(new MinecraftVersion(1, 17, 1), 756);

		map.put(new MinecraftVersion(1, 18, 0), 757);
		map.put(new MinecraftVersion(1, 18, 1), 757);
		map.put(new MinecraftVersion(1, 18, 2), 758);

		map.put(new MinecraftVersion(1, 19, 0), 759);
		map.put(new MinecraftVersion(1, 19, 1), 760);

		return map;
	}

	/**
	 * Retrieve the version of the Minecraft protocol for the current version of Minecraft.
	 *
	 * @return The version number.
	 */
	public static int getCurrentVersion() {
		return getVersion(MinecraftVersion.getCurrentVersion());
	}

	/**
	 * Retrieve the version of the Minecraft protocol for this version of Minecraft.
	 *
	 * @param version - the version.
	 * @return The version number.
	 */
	public static int getVersion(MinecraftVersion version) {
		Entry<MinecraftVersion, Integer> result = LOOKUP.floorEntry(version);
		return result != null ? result.getValue() : Integer.MIN_VALUE;
	}
}