/*
 * This file is part of ViaRewind-Legacy-Support - https://github.com/ViaVersion/ViaRewind-Legacy-Support
 * Copyright (C) 2016-2023 ViaVersion and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.viaversion.viarewind.legacysupport.listener;

import com.viaversion.viaversion.api.Via;
import org.bukkit.Location;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.util.Vector;

public class ElytraListener implements Listener {

    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
    public void onPlayerMove(PlayerMoveEvent e) {
        Player p = e.getPlayer();
        if (!p.isGliding()) return;
        if (Via.getAPI().getPlayerVersion(p) > 76) return;

        Location loc = p.getLocation();
        Vector velocity = p.getVelocity();
        Vector direction = loc.getDirection();
        double motionX = velocity.getX();
        double motionY = velocity.getY();
        double motionZ = velocity.getZ();

        float pitch = loc.getPitch() * 0.017453292F;
        double directionH = Math.sqrt(direction.getX() * direction.getX() + direction.getZ() * direction.getZ());
        double speedH = Math.sqrt(motionX * motionX + motionZ * motionZ);
        float speedV = (float) Math.cos(pitch);
        speedV = (float) (speedV * speedV * Math.min(1.0D, direction.length() / 0.4D));
        motionY += -0.08D + speedV * 0.06D;
        if ((motionY < 0.0D) && (directionH > 0.0D)) {
            double d2 = motionY * -0.1D * speedV;
            motionY += d2;
            motionX += direction.getX() * d2 / directionH;
            motionZ += direction.getZ() * d2 / directionH;
        }
        if (pitch < 0.0F) {
            double speed = speedH * -Math.sin(pitch) * 0.04D;
            motionY += speed * 3.2D;
            motionX -= direction.getX() * speed / directionH;
            motionZ -= direction.getZ() * speed / directionH;
        }
        if (directionH > 0.0D) {
            motionX += (direction.getX() / directionH * speedH - motionX) * 0.1D;
            motionZ += (direction.getZ() / directionH * speedH - motionZ) * 0.1D;
        }
        motionX *= 0.9900000095367432D;
        motionY *= 0.9800000190734863D;
        motionZ *= 0.9900000095367432D;
        velocity.setX(motionX);
        velocity.setY(motionY);
        velocity.setZ(motionZ);

        p.setVelocity(velocity);
    }
}