BloodMagic/src/main/java/WayofTime/bloodmagic/ritual/portal/LocationsHandler.java

package WayofTime.bloodmagic.ritual.portal;

import WayofTime.bloodmagic.BloodMagic;
import WayofTime.bloodmagic.teleport.PortalLocation;
import WayofTime.bloodmagic.util.BMLog;
import net.minecraftforge.common.DimensionManager;

import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;

public final class LocationsHandler implements Serializable {

    public static final long serialVersionUID = 10102001;
    private static final String fileName = String.valueOf(DimensionManager.getCurrentSaveRootDirectory()) + "/" + BloodMagic.MODID + "/PortalLocations.dat";
    private static HashMap<String, ArrayList<PortalLocation>> portals;
    private static boolean initialized = false;
    
    private LocationsHandler() {}

    public static boolean addLocation(String name, PortalLocation location) {
        ArrayList<PortalLocation> portalLocations = portals.get(name);
        if (portalLocations == null) {
            portals.put(name, new ArrayList<>());
            updateFile(fileName, portals);
        }
        portals.get(name).add(location);
        BMLog.DEBUG.info("Adding {}", name);
        updateFile(fileName, portals);
        return true;
    }

    public static boolean removeLocation(String name, PortalLocation location) {
        if (portals.get(name) != null && !portals.get(name).isEmpty()) {
            if (portals.get(name).remove(location)) {
                BMLog.DEBUG.info("Removing {}", name);
                updateFile(fileName, portals);
                return true;
            } else {
                BMLog.DEBUG.info("No location matching {}", name);
                updateFile(fileName, portals);
                return false;
            }
        }
        return false;
    }

    public static ArrayList<PortalLocation> getLinkedLocations(String name) {
        return portals.get(name);
    }

    public static void verifyIsInitialized() {
        if (!initialized) {            
            HashMap<String, ArrayList<PortalLocation>> map = loadFile();
            if(map == null) {
                portals = new HashMap<>();
            }
            initialized = true;
        }
    }

    private static HashMap<String, ArrayList<PortalLocation>> loadFile() {
        HashMap<String, ArrayList<PortalLocation>> map;
        File file = new File(fileName);
        try {
            if (!file.exists()) {
                if (file.getParentFile().mkdir()) {
                    if (file.createNewFile()) {
                        BMLog.DEBUG.info("Creating {} in {}", fileName, DimensionManager.getCurrentSaveRootDirectory());
                    }
                } else if (file.createNewFile()) {
                    BMLog.DEBUG.info("Creating {} in {}", fileName, DimensionManager.getCurrentSaveRootDirectory());
                }
            }
            FileInputStream fileIn = new FileInputStream(file);
            ObjectInputStream in = new ObjectInputStream(fileIn);
            map = (HashMap<String, ArrayList<PortalLocation>>) in.readObject();
            in.close();
            fileIn.close();
            return map;
        } catch (IOException e) {
            return null;
        } catch (ClassNotFoundException e) {
            BMLog.DEFAULT.error("{} was not found in {}", file, DimensionManager.getCurrentSaveRootDirectory());
            return null;
        }
    }

    private static void updateFile(String file, HashMap<String, ArrayList<PortalLocation>> object) {
        try {
            FileOutputStream fos = new FileOutputStream(file);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(object);
            oos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}