// Copyright (c) .NET Foundation and Contributors (https://dotnetfoundation.org/ & https://stride3d.net) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Stride.Core;
using Stride.Core.Mathematics;
using Stride.Animations;
using Stride.Input;
using Stride.Engine;

namespace ParticlesSample
{
    [DataContract]
    public class PlayAnimation
    {
        public AnimationClip Clip;
        public AnimationBlendOperation BlendOperation = AnimationBlendOperation.LinearBlend;
        public double StartTime = 0;
    }
    
    /// <summary>
    /// Script which starts a few playing animations on a target and halts
    /// </summary>
    public class AnimationStart : StartupScript
    {
        /// <summary>
        /// If <c>null</c>, will target the same entity it is attached to.
        /// </summary>
        public AnimationComponent Target { get; set; }

        /// <summary>
        /// Al list of animations to be loaded when the script starts
        /// </summary>
        public readonly List<PlayAnimation> Animations = new List<PlayAnimation>();

        public override void Start()
        {
            var animComponent = Target ?? Entity.Get<AnimationComponent>();
        
            if (animComponent != null)
                PlayAnimations(animComponent);

            // Destroy this script since it's no longer needed
            Entity.Remove(this);
        }

        private void PlayAnimations(AnimationComponent animComponent)
        {
            foreach (var anim in Animations)
            {
                if (anim.Clip != null)
                    animComponent.Add(anim.Clip, anim.StartTime, anim.BlendOperation);
            }

            Animations.Clear();
        }
    }
}