using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OSCADSharp
{
    /// <summary>
    /// An object that's mirrored on a plane
    /// </summary>
    internal class MirroredObject : SingleStatementObject
    {
        /// <summary>
        /// The normal vector of a plane intersecting the origin of the object,
        /// through which to mirror it.
        /// </summary>
        internal Vector3 Normal { get; set; } = new BindableVector();
        
        /// <summary>
        /// Creates an object that's mirrored on a plane
        /// </summary>
        /// <param name="obj">The object(s) to be mirrored</param>
        /// <param name="normal">The normal vector of the plane on the object's origin to mirror upon</param>
        internal MirroredObject(OSCADObject obj, Vector3 normal) : base(obj)
        {
            this.Normal = new BindableVector(normal);
        }

        internal MirroredObject(OSCADObject obj, Variable normal) : base(obj)
        {
            this.Bind("normal", normal);
        }

        internal MirroredObject(OSCADObject obj, Vector3 normal, Variable x, Variable y, Variable z) : base(obj)
        {
            this.Normal = new BindableVector(normal);
            this.BindIfVariableNotNull("x", x);
            this.BindIfVariableNotNull("y", y);
            this.BindIfVariableNotNull("z", z);
        }
        
        public override string ToString()
        {
            string normal = this.bindings.Contains("normal") ? this.bindings.Get("normal").BoundVariable.Text : this.Normal.ToString();

            string mirrorCommand = String.Format("mirror({0})", normal);
            var formatter = new SingleBlockFormatter(mirrorCommand, this.obj.ToString());
            return formatter.ToString();
        }

        public override OSCADObject Clone()
        {
            return new MirroredObject(this.obj.Clone(), this.Normal)
            {
                Name = this.Name,
                bindings = this.bindings.Clone()
            };
        }

        // TODO:  This will yield incorrect positions if mirroring on multiple axes
        // fix mirrored positions for multiple-axis mirroring
        public override Vector3 Position()
        {
            if (this.isMoreThanOneAxis())
            {
                throw new NotSupportedException("Getting the position of an object that's been mirrored on more than one axis is not currently supported.");
            }

            var pos = obj.Position();

            double x = this.Normal.X != 0 ? pos.X * -1 : pos.X;
            double y = this.Normal.Y != 0 ? pos.Y * -1 : pos.Y;
            double z = this.Normal.Z != 0 ? pos.Z * -1 : pos.Z;

            return new Vector3(x, y, z);
        }

        private bool isMoreThanOneAxis()
        {
            return (this.Normal.X != 0 && (this.Normal.Y != 0 || this.Normal.Z != 0)) ||
                (this.Normal.Y != 0 && (this.Normal.X != 0 || this.Normal.Z != 0));
        }

        // TODO:  As with Position, will yield incorrect positions if mirroring on multiple axes
        // fix mirrored positions for multiple-axis mirroring
        public override Bounds Bounds()
        {
            if (this.isMoreThanOneAxis())
            {
                throw new NotSupportedException("Getting the position of an object that's been mirrored on more than one axis is not currently supported.");
            }

            var oldBounds = this.obj.Bounds();
            var newBottomLeft = new Vector3(this.Normal.X != 0 ? oldBounds.BottomLeft.X * -1 : oldBounds.BottomLeft.X,
                                            this.Normal.Y != 0 ? oldBounds.BottomLeft.Y * -1 : oldBounds.BottomLeft.Y,
                                            this.Normal.Z != 0 ? oldBounds.BottomLeft.Z * -1 : oldBounds.BottomLeft.Z);

            var newTopRight = new Vector3(this.Normal.X != 0 ? oldBounds.TopRight.X * -1 : oldBounds.TopRight.X,
                                          this.Normal.Y != 0 ? oldBounds.TopRight.Y * -1 : oldBounds.TopRight.Y,
                                          this.Normal.Z != 0 ? oldBounds.TopRight.Z * -1 : oldBounds.TopRight.Z);

            return new Bounds(newBottomLeft, newTopRight);
        }

        private Bindings bindings = new Bindings(new Dictionary<string, string>() {
            {"normal", "normal"}
        });
        public override void Bind(string property, Variable variable)
        {
            var bindableVec = this.Normal as BindableVector;

            if (bindableVec != null && property == "x" || property == "y" || property == "z")
            {
                bindableVec.Bind(property, variable);
            }
            else
            {
                this.bindings.Add<MirroredObject>(this, property, variable);
            }
        }
    }
}