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
	{
		/// <summary>
        /// Places a new signaling block.
        /// Any valid functional block type with IO ports will work.
        /// This re-implements Block.PlaceNew(...)
        /// </summary>
		public static new SignalingBlock PlaceNew(BlockIDs block, float3 position,
            float3 rotation = default, BlockColors color = BlockColors.Default, byte darkness = 0,
            int uscale = 1, float3 scale = default, Player player = null)
        {
            if (PlacementEngine.IsInGame && GameState.IsBuildMode())
            {
                EGID id = PlacementEngine.PlaceBlock(block, color, darkness,
                                                     position, uscale, scale, player, rotation);
				return new SignalingBlock(id);
            }

            return null;
        }

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

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

        protected ref BlockPortsStruct GetBlockPortsStruct()
		{
			return ref BlockEngine.GetBlockInfo<BlockPortsStruct>(Id);
		}

        /// <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 port struct.
        /// </summary>
        /// <returns>The port struct.</returns>
        /// <param name="portId">Port identifier.</param>
        protected ref PortEntityStruct GetPortStruct(EGID portId)
		{
			return ref BlockEngine.GetBlockInfo<PortEntityStruct>(portId);
		}

        /// <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 => GetBlockPortsStruct().inputCount;
		}

        /// <summary>
        /// The output port count.
        /// </summary>
        public uint OutputCount
		{
			get => GetBlockPortsStruct().outputCount;
		}
	}
}