using System.Collections.Generic;
using System.Threading.Tasks;
using Gallium;

namespace Nitride.Pipelines
{
    /// <summary>
    /// A basic pipeline that is configured through properties and methods.
    /// </summary>
    public abstract class PipelineBase : IPipeline
    {
        private readonly List<IPipeline> dependencies;

        protected PipelineBase()
        {
            this.dependencies = new List<IPipeline>();
        }

        public PipelineBase AddDependency(IPipeline pipeline)
        {
            this.dependencies.Add(pipeline);
            return this;
        }

        /// <inheritdoc />
        public IEnumerable<IPipeline> GetDependencies()
        {
            return this.dependencies;
        }

        /// <inheritdoc />
        public abstract Task<IEnumerable<Entity>> RunAsync(
            IEnumerable<Entity> entities);

        /// <inheritdoc />
        public override string ToString()
        {
            return this.GetType().Name;
        }
    }
}