using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Aiwaz.Contracts;
using Aiwaz.Core;
using Aiwaz.Common.Animations;
using Aiwaz.Resources.Attributes;

namespace Aiwaz.Resources
{
    [CreationParameters("Standard orthographic camera")]
    public class OrthographicCameraParams
    {
        public float width;
        public float height;

        public OrthographicCameraParams()
        {
            width = 512;
            height = 512;
        }
    }

    [AiwazResource("Orthographic Camera", "An orthographic camera for orthogonal views.")]
    public class OrthographicCamera : BaseCamera, IOrthographicCamera
    {
        #region IOrthographicCamera Members

        private float width;
        private float height;

        private OrthographicCamera()
            : base()
        {
        }

        public OrthographicCamera(OrthographicCameraParams parameters)
            : this()
        {
            Console.WriteLine(string.Format("Creating OrthographicCamera ({0}x{1})..", parameters.width, parameters.height));

            this.Width = parameters.width;
            this.Height = parameters.height;
        }

        public float Width
        {
            get { return width; }
            set
            {
                width = value;
                WantsUpdate = true;
            }
        }

        public float Height
        {
            get { return height; }
            set
            {
                height = value;
                WantsUpdate = true;
            }
        }

        public override void Update(bool forceUpdate)
        {
            base.Update(forceUpdate);

            this.ProjectionMatrix = SlimDX.Matrix.OrthoLH(width, height, this.NearClip, this.FarClip);
            this.ViewMatrix = SlimDX.Matrix.LookAtLH(this.WorldPosition, this.WorldPosition + this.WorldDirection, this.WorldUpDirection);

            // generate view frustum
            var viewProj = this.ViewMatrix * this.ProjectionMatrix;

            // Left plane
            this.ViewFrustum.Plane[0] = new SlimDX.Plane(viewProj.M14 + viewProj.M11,
                viewProj.M24 + viewProj.M21,
                viewProj.M34 + viewProj.M31,
                viewProj.M44 + viewProj.M41);

            // Right plane
            this.ViewFrustum.Plane[1] = new SlimDX.Plane(viewProj.M14 - viewProj.M11,
                viewProj.M24 - viewProj.M21,
                viewProj.M34 - viewProj.M31,
                viewProj.M44 - viewProj.M41);

            // Top plane
            this.ViewFrustum.Plane[2] = new SlimDX.Plane(viewProj.M14 - viewProj.M12,
                viewProj.M24 - viewProj.M22,
                viewProj.M34 - viewProj.M32,
                viewProj.M44 - viewProj.M42);

            // Bottom plane
            this.ViewFrustum.Plane[3] = new SlimDX.Plane(viewProj.M14 + viewProj.M12,
                viewProj.M24 + viewProj.M22,
                viewProj.M34 + viewProj.M32,
                viewProj.M44 + viewProj.M42);

            // Near plane
            this.ViewFrustum.Plane[4] = new SlimDX.Plane(viewProj.M13,
                viewProj.M23,
                viewProj.M33,
                viewProj.M43);

            // Far plane
            this.ViewFrustum.Plane[5] = new SlimDX.Plane(viewProj.M14 - viewProj.M13,
                viewProj.M24 - viewProj.M23,
                viewProj.M34 - viewProj.M33,
                viewProj.M44 - viewProj.M43);
        }

        #endregion
    }

    [CreationParameters("Standard orthographic camera")]
    public class PerspectiveCameraParams
    {
        public float fov;
        public float aspectRatio;

        public PerspectiveCameraParams()
        {
            fov = 90.0f;
            aspectRatio = 1.0f;
        }
    }

    [AiwazResource("Perspective Camera", "An perspective camera for perspective correct views.")]
    public class PerspectiveCamera : BaseCamera, IPerspectiveCamera
    {
        #region IPerspectiveCamera Members

        private float fov;
        private float aspectRatio;

        private PerspectiveCamera()
            : base()
        {
        }

        public PerspectiveCamera(PerspectiveCameraParams parameters)
            : this()
        {
            Console.WriteLine(string.Format("Creating PerspectiveCamera (Fov: {0} AspectRatio: {1})..", parameters.fov, parameters.aspectRatio));

            this.Fov = parameters.fov;
            this.AspectRatio = parameters.aspectRatio;
        }

        [Animateable]
        public float Fov
        {
            get { return fov; }
            set
            {
                fov = value;
                WantsUpdate = true;
            }
        }

        [Animateable]
        public float AspectRatio
        {
            get { return aspectRatio; }
            set
            {
                aspectRatio = value;
                WantsUpdate = true;
            }
        }

        public override void Update(bool forceUpdate)
        {
	        base.Update(forceUpdate);

            this.ProjectionMatrix = SlimDX.Matrix.PerspectiveFovLH((float)((Math.PI / 180) * fov), this.AspectRatio, this.NearClip, this.FarClip);
            this.ViewMatrix = SlimDX.Matrix.LookAtLH(this.WorldPosition, this.WorldPosition + this.WorldDirection, this.WorldUpDirection);

	        // generate view frustum
            var viewProj = this.ViewMatrix * this.ProjectionMatrix;

	        // Left plane
            this.ViewFrustum.Plane[0] = new SlimDX.Plane(
                viewProj.M14 + viewProj.M11,
                viewProj.M24 + viewProj.M21,
                viewProj.M34 + viewProj.M31,
                viewProj.M44 + viewProj.M41);

	        // Right plane
            this.ViewFrustum.Plane[1] = new SlimDX.Plane(viewProj.M14 - viewProj.M11,
                viewProj.M24 - viewProj.M21,
                viewProj.M34 - viewProj.M31,
                viewProj.M44 - viewProj.M41);

	        // Top plane
	        this.ViewFrustum.Plane[2] = new SlimDX.Plane(viewProj.M14 - viewProj.M12,
	            viewProj.M24 - viewProj.M22,
	            viewProj.M34 - viewProj.M32,
	            viewProj.M44 - viewProj.M42);

	        // Bottom plane
            this.ViewFrustum.Plane[3] = new SlimDX.Plane(viewProj.M14 + viewProj.M12,
                viewProj.M24 + viewProj.M22,
                viewProj.M34 + viewProj.M32,
                viewProj.M44 + viewProj.M42);

	        // Near plane
            this.ViewFrustum.Plane[4] = new SlimDX.Plane(viewProj.M13,
	            viewProj.M23,
	            viewProj.M33,
	            viewProj.M43);

	        // Far plane
	        this.ViewFrustum.Plane[5] = new SlimDX.Plane(viewProj.M14 - viewProj.M13,
	            viewProj.M24 - viewProj.M23,
	            viewProj.M34 - viewProj.M33,
	            viewProj.M44 - viewProj.M43);
        }

        #endregion
    }

    public abstract class BaseCamera : Transformation, ICamera
    {
        #region ICamera Members

        private float nearClip = 1.0f;
        private float farClip = 1000.0f;

        Reference projectionMatrix = new Reference(new SlimDX.Matrix());
        Reference viewMatrix = new Reference(new SlimDX.Matrix());
        public SlimDX.Matrix ProjectionMatrix { get { return (SlimDX.Matrix)projectionMatrix.RawValue; } protected set { projectionMatrix.RawValue = value; } }
        public SlimDX.Matrix ViewMatrix { get { return (SlimDX.Matrix)viewMatrix.RawValue; } protected set { viewMatrix.RawValue = value; } }

        public BaseCamera()
            : base(new CameraTransformationBindings())
        {
            this.ViewFrustum = new ViewFrustum();
            this.IsPreconditionForFollowingShaders = true;
	        this.RecreateAllShaderParameters();
        }

        public float FarClip
        {
            get { return farClip; }
            set
            {
                farClip = value;
                WantsUpdate = true;
            }
        }

        public float NearClip
        {
            get { return nearClip; }
            set
            {
                nearClip = value;
                WantsUpdate = true;
            }
        }

        public ViewFrustum ViewFrustum { get; protected set; }

        protected override void RecreateAllShaderParameters()
        {
	        this.SetParameter("ViewMatrix", viewMatrix, ParameterBindType.BindBySemantic);
            this.SetParameter("ProjectionMatrix", projectionMatrix, ParameterBindType.BindBySemantic);

	        base.RecreateAllShaderParameters();
        }

        #endregion
    }
}