1 files changed, 41 insertions, 0 deletions
diff --git a/src/net/minecraft/VersionManager.java b/src/net/minecraft/VersionManager.java
new file mode 100644
index 0000000..1c7a114
--- /dev/null
+++ b/src/net/minecraft/VersionManager.java
@@ -0,0 +1,41 @@
+package net.minecraft;
+
+import java.io.IOException;
+import java.net.URL;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Scanner;
+
+public class VersionManager {
+	public final List<GameVersion> versions = new ArrayList<>();
+
+	public VersionManager() {
+		try {
+			downloadVersionList();
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	public GameVersion getVersionForInstant(Instant instant) {
+		return versions.stream()
+				.filter(v -> !v.isPreleaseOrDemo())
+				.filter(v -> v.releasedOn.isBefore(instant))
+				.max(Comparator.comparing((GameVersion a) -> a.releasedOn))
+				.orElse(null);
+	}
+
+	private void downloadVersionList() throws IOException {
+		URL versionListURL = new URL("http://files.betacraft.uk/launcher/assets/version_list.txt");
+		Scanner scanner = new Scanner(versionListURL.openStream(), "UTF-8");
+		while (scanner.hasNextLine()) {
+			String[] versionInfo = scanner.nextLine().split("`");
+			long compileTimestamp = Long.parseLong(versionInfo[2]);
+			long releaseTimestamp = Long.parseLong(versionInfo[3]);
+			GameVersion version = new GameVersion(versionInfo[0], versionInfo[1], compileTimestamp, releaseTimestamp);
+			versions.add(version);
+		}
+	}
+}