using Gamecraft.Blocks.BlockGroups;
using Unity.Mathematics;
using UnityEngine;

using GamecraftModdingAPI.Blocks;
using GamecraftModdingAPI.Utility;

namespace GamecraftModdingAPI
{
    /// <summary>
    /// A group of blocks that can be selected together. The placed version of blueprints.
    /// </summary>
    public class BlockGroup
    {
        internal static BlueprintEngine _engine = new BlueprintEngine();
        public int Id { get; }
        private readonly Block sourceBlock;

        internal BlockGroup(int id, Block block)
        {
            if (id == BlockGroupUtility.GROUP_UNASSIGNED)
                throw new BlockException("Cannot create a block group for blocks without a group!");
            Id = id;
            sourceBlock = block;
        }
        
        /// <summary>
        /// The position of the block group. Calculated when GetBlocks() is used.
        /// </summary>
        public float3 Position { get; private set; }
        
        /// <summary>
        /// The rotation of the block group. Calculated when GetBlocks() is used.
        /// </summary>
        public float3 Rotation { get; private set; }

        /// <summary>
        /// Collects each block that is a part of this group. Also sets the position and rotation.
        /// </summary>
        /// <returns>An array of blocks</returns>
        public Block[] GetBlocks()
        {
            var ret = _engine.GetBlocksFromGroup(sourceBlock.Id, out var pos, out var rot);
            Position = pos;
            Rotation = ((Quaternion) rot).eulerAngles;
            return ret;
        }

        /// <summary>
        /// Removes all of the blocks in this group from the world.
        /// </summary>
        public void Remove()
        {
            _engine.RemoveBlockGroup(Id);
        }

        public static void Init()
        {
            GameEngineManager.AddGameEngine(_engine);
        }
    }
}