package com.thebrokenrail.freshcoffee.util;

import com.thebrokenrail.freshcoffee.config.HardcodedConfig;
import net.fabricmc.loader.api.FabricLoader;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.File;

public final class Util {
    public static final int JAVA_VERSION;

    static {
        String version = System.getProperty("java.version");
        if (version.startsWith("1.")) {
            version = version.substring(2, 3);
        } else {
            int dot = version.indexOf('.');
            if (dot != -1) {
                version = version.substring(0, dot);
            }
        }
        JAVA_VERSION = Integer.parseInt(version);
    }

    public static File getJavaDir(String version) {
        return new File(HardcodedConfig.INSTALL_DIR, version);
    }

    public static void deleteDirectory(File directoryToBeDeleted) {
        File[] allContents = directoryToBeDeleted.listFiles();
        if (allContents != null) {
            for (File file : allContents) {
                deleteDirectory(file);
            }
        }
        getLogger().debug("Deleting: " + directoryToBeDeleted.getAbsolutePath());
        //noinspection ResultOfMethodCallIgnored
        directoryToBeDeleted.delete();
    }

    public static Logger getLogger() {
        return LogManager.getLogger(HardcodedConfig.TITLE);
    }

    static String getMainClass() {
        switch (FabricLoader.getInstance().getEnvironmentType()) {
            case CLIENT: {
                return "net.fabricmc.loader.launch.knot.KnotClient";
            }
            case SERVER: {
                return "net.fabricmc.loader.launch.knot.KnotServer";
            }
            default: {
                throw new UnsupportedOperationException();
            }
        }
    }

    public static String humanReadableByteCount(long bytes, boolean si) {
        int unit = si ? 1000 : 1024;
        if (bytes < unit) {
            return bytes + " B";
        }
        int exp = (int) (Math.log(bytes) / Math.log(unit));
        String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
    }
}