package com.thebrokenrail.freshcoffee.util;

import com.thebrokenrail.freshcoffee.util.limit.LimitUtil;

public final class JavaVersionUtil {
    private static boolean isNewer(int[] one, int[] two) {
        int length = Math.min(one.length, two.length);
        for (int i = 0; i < length; i++) {
            if (one[i] > two[i]) {
                return true;
            }
        }
        return false;
    }

    private static int[] toIntArray(String versionStr) {
        String[] versionArr = versionStr.split("[.+]");

        boolean invalid = false;
        int[] version = new int[versionArr.length];
        for (int i = 0; i < versionArr.length; i++) {
            try {
                version[i] = Integer.parseInt(versionArr[i]);
            } catch (NumberFormatException e) {
                invalid = true;
                break;
            }
        }

        return invalid ? null : version;
    }

    public static String getNewest(String[] list) {
        String newest = null;
        for (String jdk : list) {
            int[] version = toIntArray(jdk);

            if (version != null) {
                boolean newer = true;
                if (version[0] < LimitUtil.getMinimumJavaVersion().getValue() || version[0] > LimitUtil.getMaximumJavaVersion().getValue() || (newest != null && !isNewer(toIntArray(newest), version))) {
                    newer = false;
                }

                if (newer) {
                    newest = jdk;
                }
            }
        }

        return newest;
    }
}