package net.rustnotmc.client;

import net.rustnotmc.loader.Log;

/**
 * Temporary diagnostics, added to work out why jumping and flight misbehave.
 *
 * Static analysis kept producing confident and wrong answers about this path, so
 * the state is measured instead. Delete this file and its patch entry once the
 * movement bugs are closed.
 */
public final class RsxDebug {

    private static int ticks;

    private RsxDebug() {
    }

    /** One-off trace for the empty sound registry. */
    public static void sound(String message) {
        Log.info("DBG snd " + message);
    }

    /** Called from EntityPlayerSP.onLivingUpdate, once a second. */
    public static void movement(Object self) {
        if (++ticks % 20 != 0) {
            return;
        }
        Log.info("DBG sp onGround=" + read(self, "onGround")
                + " inJump=" + read(self, "movementInput")
                + " isJumping=" + read(self, "isJumping")
                + " riding=" + read(self, "isRiding")
                + " srvWorld=" + read(self, "isServerWorld")
                + " allowFly=" + read(self, "allowFlying")
                + " flying=" + read(self, "isFlying")
                + " mY=" + read(self, "motionY")
                + " y=" + read(self, "posY"));
    }

    /**
     * Reads a field by name.
     *
     * Deliberately reflective and deliberately forgiving: a diagnostic that
     * throws when a field is renamed is worse than one that prints null.
     */
    private static String read(Object target, String field) {
        if (target == null) {
            return "?";
        }
        try {
            java.lang.reflect.Field f = findField(target.getClass(), field);
            if (f == null) {
                return "?";
            }
            f.setAccessible(true);
            return String.valueOf(f.get(target));
        } catch (Throwable t) {
            return "!";
        }
    }

    private static java.lang.reflect.Field findField(Class<?> type, String name) {
        while (type != null) {
            try {
                return type.getDeclaredField(name);
            } catch (NoSuchFieldException e) {
                type = type.getSuperclass();
            }
        }
        return null;
    }
}