Server/src/engine/db/handlers/dbStaticWorldHandler.java

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//      Magicbane Emulator Project © 2013 - 2026
//                https://www.magicbane.com

package engine.db.handlers;

import engine.gameManager.DbManager;
import org.pmw.tinylog.Logger;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.TreeMap;

public class dbStaticWorldHandler extends dbHandlerBase {

    public dbStaticWorldHandler() {

    }

    // Table and column come from StaticManifest's fixed list, never from input. -1 means "none" and is skipped.
    public HashMap<Integer, Integer> GET_NEGATIVE_REFERENCES(String table, String column) {

        HashMap<Integer, Integer> rowsByValue = new HashMap<>();

        try (Connection connection = DbManager.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement("SELECT `" + column + "` AS `value`, COUNT(*) AS `rows` FROM `"
                     + table + "` WHERE `" + column + "` < -1 GROUP BY `" + column + "`;")) {

            ResultSet rs = preparedStatement.executeQuery();

            while (rs.next())
                rowsByValue.put(rs.getInt("value"), rs.getInt("rows"));

        } catch (SQLException e) {
            Logger.error(table + "." + column + ": " + e);
            return null;
        }

        return rowsByValue;
    }

    // Every DB guild name by UID, for the NPC guild switch check (World Boot Plan 2.8); null on error.
    public TreeMap<Integer, String> GET_GUILD_NAMES() {

        TreeMap<Integer, String> namesByUID = new TreeMap<>();

        try (Connection connection = DbManager.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement("SELECT `UID`, `name` FROM `obj_guild`;")) {

            ResultSet rs = preparedStatement.executeQuery();

            while (rs.next())
                namesByUID.put(rs.getInt("UID"), rs.getString("name"));

        } catch (SQLException e) {
            Logger.error(e);
            return null;
        }

        return namesByUID;
    }

    // obj_zone rows built by the import procedures; 0 once the 2.4 migration has run, -1 on error.
    public int COUNT_STATIC_ZONE_ROWS() {

        try (Connection connection = DbManager.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement("SELECT COUNT(*) AS `zones` FROM `obj_zone` WHERE `template` <> 0;")) {

            ResultSet rs = preparedStatement.executeQuery();

            if (rs.next())
                return rs.getInt("zones");

        } catch (SQLException e) {
            Logger.error(e);
        }

        return -1;
    }

    // NPC cities still in obj_city; 0 once the 2.5 migration has run, -1 on error.
    public int COUNT_NPC_CITY_ROWS() {

        try (Connection connection = DbManager.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement("SELECT COUNT(*) AS `cities` FROM `obj_city` WHERE `isNpc` = 1;")) {

            ResultSet rs = preparedStatement.executeQuery();

            if (rs.next())
                return rs.getInt("cities");

        } catch (SQLException e) {
            Logger.error(e);
        }

        return -1;
    }

    // "<parent>/<name>" of every obj_npc row, to tell whether the 3.2 trainer migration has run; null on error.
    public HashSet<String> GET_NPC_ZONE_NAMES() {

        HashSet<String> zoneNames = new HashSet<>();

        try (Connection connection = DbManager.getConnection();
             PreparedStatement preparedStatement = connection.prepareStatement("SELECT `object`.`parent`, `obj_npc`.`npc_name` FROM `object` "
                     + "INNER JOIN `obj_npc` ON `obj_npc`.`UID` = `object`.`UID`;")) {

            ResultSet rs = preparedStatement.executeQuery();

            while (rs.next())
                zoneNames.add(rs.getInt("parent") + "/" + rs.getString("npc_name"));

        } catch (SQLException e) {
            Logger.error(e);
            return null;
        }

        return zoneNames;
    }
}