// Original code dervied from:
// https://github.com/thelinuxlich/starwarrior_CSharp/blob/master/StarWarrior/StarWarrior/Systems/MovementSystem.cs

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="MovementSystem.cs" company="GAMADU.COM">
//     Copyright © 2013 GAMADU.COM. All rights reserved.
//
//     Redistribution and use in source and binary forms, with or without modification, are
//     permitted provided that the following conditions are met:
//
//        1. Redistributions of source code must retain the above copyright notice, this list of
//           conditions and the following disclaimer.
//
//        2. Redistributions in binary form must reproduce the above copyright notice, this list
//           of conditions and the following disclaimer in the documentation and/or other materials
//           provided with the distribution.
//
//     THIS SOFTWARE IS PROVIDED BY GAMADU.COM 'AS IS' AND ANY EXPRESS OR IMPLIED
//     WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
//     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GAMADU.COM OR
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//     The views and conclusions contained in the software and documentation are those of the
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// </copyright>
// <summary>
//   The movement system.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;
using Microsoft.Xna.Framework;
using MonoGame.Extended;
using MonoGame.Extended.Entities;
using MonoGame.Extended.Entities.Systems;
using StarWarrior.Components;

namespace StarWarrior.Systems
{
    public class MovementSystem : EntityProcessingSystem
    {
        public MovementSystem() 
            : base(Aspect.All(typeof(Transform2), typeof(PhysicsComponent)))
        {
        }

        public override void Initialize(IComponentMapperService mapperService)
        {
        }

        public override void Process(GameTime gameTime, int entityId)
        {
            var entity = GetEntity(entityId);
            var transform = entity.Get<Transform2>();
            var physics = entity.Get<PhysicsComponent>();

            var milliseconds = (float)gameTime.ElapsedGameTime.TotalMilliseconds;
            var deltaPosition = physics.Speed * milliseconds;
            var deltaRotatedPosition = new Vector2(
                (float)(Math.Cos(physics.AngleAsRadians) * deltaPosition),
                (float)(Math.Sin(physics.AngleAsRadians) * deltaPosition));
            transform.Position += deltaRotatedPosition;
        }
    }
}