DeathCounter/src/main/java/me/firephoenix/deathcounter/DeathCounter.java

package me.firephoenix.deathcounter;

import me.clip.placeholderapi.PlaceholderAPI;
import me.firephoenix.deathcounter.commands.DeathsCommand;
import me.firephoenix.deathcounter.listener.DeathListener;
import org.bukkit.Bukkit;
import org.bukkit.plugin.java.JavaPlugin;

import java.sql.*;
import java.util.HashMap;
import java.util.UUID;
import java.util.logging.Level;

public final class DeathCounter extends JavaPlugin {
    public String dataBaseURL;
    public HashMap<UUID, Integer> playerDeaths = new HashMap<>();

    public HashMap<UUID, Integer> getPlayerDeaths() {
        return playerDeaths;
    }

    public String getDataBaseURL() {
        return dataBaseURL;
    }

    @Override
    public void onEnable() {
        // Plugin startup logic
        this.saveDefaultConfig();

        Bukkit.getServer().getPluginManager().registerEvents(new DeathListener(this), this);

        dataBaseURL = "jdbc:sqlite:" + this.getDataPath() + "/deaths.db";

        createSqLiteDatabase();

        if (Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI")) {
            new DeathPlaceholderExpansion(this).register();
        }

        getCommand("deaths").setExecutor(new DeathsCommand(this));
    }

    private void createSqLiteDatabase() {
        try (var conn = DriverManager.getConnection(dataBaseURL)) {
            if (conn != null) {
                String sql = "CREATE TABLE IF NOT EXISTS deaths_counts ("
                        + " id BIGINT auto_increment,"
                        + " uuid VARCHAR(36) NOT NULL UNIQUE,"
                        + " deaths BIGINT NOT NULL,"
                        + " primary key (id));";

                Statement statement = conn.createStatement();
                statement.execute(sql);
            }
        } catch (SQLException e) {
            Bukkit.getLogger().log(Level.WARNING, e.getMessage());
        }
    }

    public int requestDeathCountForPlayer(UUID uuid) {
        //Search our cache first
        if (getPlayerDeaths().containsKey(uuid)) {
            return getPlayerDeaths().get(uuid);
        } else {
            int deaths = 0;
            try (var conn = DriverManager.getConnection(this.getDataBaseURL())) {
                if (conn != null) {
                    String getSQL = "SELECT deaths FROM deaths_counts WHERE uuid = " + "'" + uuid + "'" + ";";

                    Statement statement = conn.createStatement();
                    ResultSet resultSet = statement.executeQuery(getSQL);

                    if (resultSet.next()) {
                        deaths = resultSet.getInt(1);
                    }
                }
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }

            getPlayerDeaths().put(uuid, deaths);

            return deaths;
        }
    }

    @Override
    public void onDisable() {
        // Plugin shutdown logic
    }
}