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

package engine.parsers.cache;

import engine.gameManager.ConfigManager;
import engine.gameManager.DbManager;
import engine.mbEnums;
import engine.objects.AbstractGameObject;
import engine.objects.BaseClass;
import engine.parsers.objects.RuneTemplate;
import org.pmw.tinylog.Logger;

import java.util.LinkedHashMap;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;

// Dev-only check that compares DB-built objects with the cache JSON before a loader is switched.
// Enabled by the optional env var MB_PARITY_CHECK; not in the ConfigManager enum, which requires every entry.

public class ParityCheck {

    private static final String FLAG_NAME = "MB_PARITY_CHECK";
    private static final LinkedHashMap<String, Consumer<ParityCheck>> comparators = new LinkedHashMap<>();

    private final String table;
    private int comparedCount = 0;
    private int differenceCount = 0;
    private int missingCount = 0;

    static {
        register("static_rune_baseclass", ParityCheck::compareBaseClasses);
    }

    private ParityCheck(String table) {
        this.table = table;
    }

    public static boolean isEnabled() {
        return ConfigManager.configMap.getOrDefault(FLAG_NAME, "false").equalsIgnoreCase("true");
    }

    public static void register(String table, Consumer<ParityCheck> comparator) {
        comparators.put(table, comparator);
    }

    public static void run() {

        ParityCheck check;

        for (String table : comparators.keySet()) {
            check = new ParityCheck(table);

            try {
                comparators.get(table).accept(check);
            } catch (Exception e) {
                Logger.error("Parity: " + table + ": comparator failed: " + e);
            }

            Logger.info("Parity: " + table + ": " + check.comparedCount + " compared, "
                    + check.differenceCount + " differences, " + check.missingCount + " missing in json");
        }
    }

    // Returns false when the row has no JSON counterpart, so the comparator can skip its fields.

    public boolean compareRow(int id, Object jsonObject) {

        comparedCount++;

        if (jsonObject == null) {
            missingCount++;
            Logger.warn("Parity: " + table + "/" + id + ": missing in json");
            return false;
        }

        return true;
    }

    public void compareField(int id, String field, Object dbValue, Object jsonValue) {

        if (Objects.equals(dbValue, jsonValue))
            return;

        differenceCount++;
        Logger.warn("Parity: " + table + "/" + id + "/" + field + ": db=" + dbValue + " json=" + jsonValue);
    }

    private static void compareBaseClasses(ParityCheck check) {

        ConcurrentHashMap<Integer, AbstractGameObject> cache;
        BaseClass baseClass;
        RuneTemplate rune;

        cache = DbManager.getMap(mbEnums.GameObjectType.BaseClass);

        if (cache == null) {
            Logger.warn("Parity: static_rune_baseclass: no BaseClass objects loaded");
            return;
        }

        for (AbstractGameObject cached : cache.values()) {
            baseClass = (BaseClass) cached;
            rune = RuneTemplate._runes.get(baseClass.getObjectUUID());

            if (!check.compareRow(baseClass.getObjectUUID(), rune))
                continue;

            check.compareField(baseClass.getObjectUUID(), "name", baseClass.getName(), rune.obj_name);
        }
    }
}