using System;

using Gamecraft.Wires;
using Svelto.ECS;
using Unity.Mathematics;

using GamecraftModdingAPI;
using GamecraftModdingAPI.Utility;

namespace GamecraftModdingAPI.Blocks
{
    /// <summary>
    /// Common implementation for blocks that support wiring.
    /// </summary>
	public class SignalingBlock : Block
	{
		public SignalingBlock(EGID id) : base(id)
		{
			if (!BlockEngine.GetBlockInfoExists<BlockPortsStruct>(this))
            {
                throw new BlockTypeException($"Block is not a {this.GetType().Name} block");
            }
		}

		public SignalingBlock(uint id) : base(id)
		{
			if (!BlockEngine.GetBlockInfoExists<BlockPortsStruct>(this))
            {
                throw new BlockTypeException($"Block is not a {this.GetType().Name} block");
            }
		}

        /// <summary>
        /// Generates the input port identifiers.
        /// </summary>
        /// <returns>The input identifiers.</returns>
		protected EGID[] GetInputIds()
		{
			return SignalEngine.GetSignalInputs(Id);
		}

        /// <summary>
        /// Generates the output port identifiers.
        /// </summary>
        /// <returns>The output identifiers.</returns>
		protected EGID[] GetOutputIds()
        {
            return SignalEngine.GetSignalOutputs(Id);
        }

        /// <summary>
        /// Gets the connected wire.
        /// </summary>
        /// <returns>The connected wire.</returns>
        /// <param name="portId">Port identifier.</param>
        /// <param name="connected">Whether the port has a wire connected to it.</param>
        protected ref WireEntityStruct GetConnectedWire(EGID portId, out bool connected)
		{
			return ref SignalEngine.MatchPortToWire(portId, Id, out connected);
		}

        /// <summary>
        /// [EXPERIMENTAL] Gets the channel data.
        /// </summary>
        /// <returns>The channel data.</returns>
        /// <param name="portId">Port identifier.</param>
        /// <param name="exists">Whether the channel actually exists.</param>
		protected ref ChannelDataStruct GetChannelData(EGID portId, out bool exists)
		{
			return ref SignalEngine.GetChannelDataStruct(portId, out exists);
		}

        /// <summary>
        /// The input port count.
        /// </summary>
        public uint InputCount
        {
	        get => BlockEngine.GetBlockInfo(this, (BlockPortsStruct st) => st.inputCount);
        }

        /// <summary>
        /// The output port count.
        /// </summary>
        public uint OutputCount
		{
	        get => BlockEngine.GetBlockInfo(this, (BlockPortsStruct st) => st.outputCount);
		}
	}
}