package app.utils;

import app.entities.other.SteamID;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

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

//https://github.com/SteamRun/SteamIDConverter/blob/master/SteamIDConverter.html
public class SteamIDConverter {
    private static final String SID64_1 = "7656";
    private static final long SID64_S = Long.valueOf("1197960265728");

    private static final Pattern PatternSteam3ID = Pattern.compile("^\\[([Ug]):([0-9]):([0-9]+)\\]$");
    private static final Pattern PatternSteamID32 = Pattern.compile("^STEAM_([0-9]):([0-9]):([0-9]+)$");
    private static final Pattern PatternSteamID64 = Pattern.compile("7656([0-9]{12,14})");
    private final Pattern PatternCustomUrl = Pattern.compile("steamcommunity\\.com\\/id\\/([A-Za-z0-9-_]{2,32})");
    private final Pattern PatternMaybeCustomUrl = Pattern.compile("^([A-Za-z0-9-_]{2,32})$");

    public static SteamID getSteamID(Object obj){
        return getSteamID((String) obj);
    }

    public static SteamID getSteamID(String text){
        boolean isSteamID = false;

        String steam3;
        String steam2;
        String steam64;

        String S3ID_1;
        long S3ID_2 = 0;
        long S3ID_3 = 0;

        long SID32_1 = 0;
        long SID32_2 = 0;
        long SID32_3 = 0;

        long SID64_2 = 0;

        Matcher result;

        if((result = PatternSteam3ID.matcher(text)).find()){
            //Matcher result = PatternSteam3ID.matcher(text);
            S3ID_1 = result.group(1);
            S3ID_2 = Long.parseLong(result.group(2));
            S3ID_3 = Long.parseLong(result.group(3));

            if(Math.abs(S3ID_3 % 2) == 1){
                SID32_2 = 1;
            } else {
                SID32_2 = 0;
            }

            SID32_3 = (S3ID_3 - SID32_2) / 2;
            SID64_2 = S3ID_3 + SID64_S;
            isSteamID = true;
        } else if ((result = PatternSteamID32.matcher(text)).find()){
            //Matcher result = PatternSteamID32.matcher(text);
            SID32_1 = Long.parseLong(result.group(1));
            SID32_2 = Long.parseLong(result.group(2));
            SID32_3 = Long.parseLong(result.group(3));
            S3ID_3 = SID32_3 * 2 + SID32_2;
            SID64_2 = S3ID_3 + SID64_S;
            isSteamID = true;
        } else if ((result = PatternSteamID64.matcher(text)).find()) {
            //Matcher result = PatternSteamID64.matcher(text);
            SID64_2 = Long.parseLong(result.group(1));
            S3ID_3 = SID64_2 - SID64_S;

            if(Math.abs(S3ID_3 % 2) == 1){
                SID32_2 = 1;
            } else {
                SID32_2 = 0;
            }

            SID32_3 = (S3ID_3 - SID32_2) / 2;
            isSteamID = true;
        }

        if(!isSteamID) return null;

        steam3 = String.format("[U:1:%s]",S3ID_3);
        steam2 = String.format("STEAM_0:%s:%s", SID32_2, SID32_3);
        steam64 = String.format("%s%s", SID64_1, SID64_2);
        return new SteamID(steam3, steam2, steam64, S3ID_3);
    }
}