/// <reference path="../../../dist/preview release/babylon.d.ts"/>

module BABYLON {

    class TerrainMaterialDefines extends MaterialDefines {
        public DIFFUSE = false;
        public BUMP = false;
        public CLIPPLANE = false;
        public ALPHATEST = false;
        public POINTSIZE = false;
        public FOG = false;
        public SPECULARTERM = false;
        public NORMAL = false;
        public UV1 = false;
        public UV2 = false;
        public VERTEXCOLOR = false;
        public VERTEXALPHA = false;
        public NUM_BONE_INFLUENCERS = 0;
        public BonesPerMesh = 0;
        public INSTANCES = false;
        public USERIGHTHANDEDSYSTEM = false;

        constructor() {
            super();
            this.rebuild();
        }
    }

    export class TerrainMaterial extends PushMaterial {
        @serializeAsTexture("mixTexture")
        private _mixTexture: BaseTexture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public mixTexture: BaseTexture;        
        
        @serializeAsTexture("diffuseTexture1")
        private _diffuseTexture1: Texture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public diffuseTexture1: Texture;

        @serializeAsTexture("diffuseTexture2")
        private _diffuseTexture2: Texture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public diffuseTexture2: Texture;
        
        @serializeAsTexture("diffuseTexture3")
        private _diffuseTexture3: Texture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public diffuseTexture3: Texture;
        
        @serializeAsTexture("bumpTexture1")
        private _bumpTexture1: Texture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public bumpTexture1: Texture;        
        
        @serializeAsTexture("bumpTexture2")
        private _bumpTexture2: Texture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public bumpTexture2: Texture;        
        
        @serializeAsTexture("bumpTexture3")
        private _bumpTexture3: Texture;
        @expandToProperty("_markAllSubMeshesAsTexturesDirty")
        public bumpTexture3: Texture;   
        
        @serializeAsColor3()
        public diffuseColor = new Color3(1, 1, 1);
        
        @serializeAsColor3()
        public specularColor = new Color3(0, 0, 0);
        
        @serialize()
        public specularPower = 64;
        
        @serialize("disableLighting")
        private _disableLighting = false;
        @expandToProperty("_markAllSubMeshesAsLightsDirty")
        public disableLighting: boolean;   
        
        @serialize("maxSimultaneousLights")
        private _maxSimultaneousLights = 4;
        @expandToProperty("_markAllSubMeshesAsLightsDirty")
        public maxSimultaneousLights: number; 

        private _worldViewProjectionMatrix = Matrix.Zero();
        private _renderId: number;

        constructor(name: string, scene: Scene) {
            super(name, scene);
        }

        public needAlphaBlending(): boolean {
            return (this.alpha < 1.0);
        }

        public needAlphaTesting(): boolean {
            return false;
        }

        public getAlphaTestTexture(): BaseTexture {
            return null;
        }

        // Methods   
        public isReadyForSubMesh(mesh: AbstractMesh, subMesh: SubMesh, useInstances?: boolean): boolean {   
            if (this.isFrozen) {
                if (this._wasPreviouslyReady && subMesh.effect) {
                    return true;
                }
            }

            if (!subMesh._materialDefines) {
                subMesh._materialDefines = new TerrainMaterialDefines();
            }

            var defines = <TerrainMaterialDefines>subMesh._materialDefines;
            var scene = this.getScene();

            if (!this.checkReadyOnEveryCall && subMesh.effect) {
                if (this._renderId === scene.getRenderId()) {
                    return true;
                }
            }

            var engine = scene.getEngine();

            // Textures
            if (scene.texturesEnabled) {
                if (this.mixTexture && StandardMaterial.DiffuseTextureEnabled) {
                    if (!this.mixTexture.isReady()) {
                        return false;
                    } else {
                        defines._needUVs = true;
                        defines.DIFFUSE = true;
                    }
                }
                if ((this.bumpTexture1 || this.bumpTexture2 || this.bumpTexture3) && StandardMaterial.BumpTextureEnabled) {
                    defines._needUVs = true;
                    defines._needNormals = true;
                    defines.BUMP = true;
                }
            }
            
            // Misc.
            MaterialHelper.PrepareDefinesForMisc(mesh, scene, false, this.pointsCloud, this.fogEnabled, defines);

            // Lights
            defines._needNormals = MaterialHelper.PrepareDefinesForLights(scene, mesh, defines, false, this._maxSimultaneousLights, this._disableLighting);

            // Values that need to be evaluated on every frame
            MaterialHelper.PrepareDefinesForFrameBoundValues(scene, engine, defines, useInstances);
            
            // Attribs
            MaterialHelper.PrepareDefinesForAttributes(mesh, defines, true, true);

            // Get correct effect      
            if (defines.isDirty) {
                defines.markAsProcessed();
                scene.resetCachedMaterial();

                // Fallbacks
                var fallbacks = new EffectFallbacks();             
                if (defines.FOG) {
                    fallbacks.addFallback(1, "FOG");
                }

                MaterialHelper.HandleFallbacksForShadows(defines, fallbacks, this.maxSimultaneousLights);
             
                if (defines.NUM_BONE_INFLUENCERS > 0) {
                    fallbacks.addCPUSkinningFallback(0, mesh);
                }

                //Attributes
                var attribs = [VertexBuffer.PositionKind];

                if (defines.NORMAL) {
                    attribs.push(VertexBuffer.NormalKind);
                }

                if (defines.UV1) {
                    attribs.push(VertexBuffer.UVKind);
                }

                if (defines.UV2) {
                    attribs.push(VertexBuffer.UV2Kind);
                }

                if (defines.VERTEXCOLOR) {
                    attribs.push(VertexBuffer.ColorKind);
                }

                MaterialHelper.PrepareAttributesForBones(attribs, mesh, defines, fallbacks);
                MaterialHelper.PrepareAttributesForInstances(attribs, defines);

                // Legacy browser patch
                var shaderName = "terrain";
                var join = defines.toString();
                var uniforms = ["world", "view", "viewProjection", "vEyePosition", "vLightsType", "vDiffuseColor", "vSpecularColor",
                    "vFogInfos", "vFogColor", "pointSize",
                    "vTextureInfos", 
                    "mBones",
                    "vClipPlane", "textureMatrix",
                    "diffuse1Infos", "diffuse2Infos", "diffuse3Infos"
                ];
                var samplers = ["textureSampler", "diffuse1Sampler", "diffuse2Sampler", "diffuse3Sampler",
                    "bump1Sampler", "bump2Sampler", "bump3Sampler"
                ];

                var uniformBuffers = [];

                MaterialHelper.PrepareUniformsAndSamplersList(<EffectCreationOptions>{
                    uniformsNames: uniforms, 
                    uniformBuffersNames: uniformBuffers,
                    samplers: samplers, 
                    defines: defines, 
                    maxSimultaneousLights: this.maxSimultaneousLights
                });
                
                subMesh.setEffect(scene.getEngine().createEffect(shaderName,
                    <EffectCreationOptions>{
                        attributes: attribs,
                        uniformsNames: uniforms,
                        uniformBuffersNames: uniformBuffers,
                        samplers: samplers,
                        defines: join,
                        fallbacks: fallbacks,
                        onCompiled: this.onCompiled,
                        onError: this.onError,
                        indexParameters: { maxSimultaneousLights: this.maxSimultaneousLights }
                    }, engine), defines);
            }
            if (!subMesh.effect.isReady()) {
                return false;
            }

            this._renderId = scene.getRenderId();
            this._wasPreviouslyReady = true;

            return true;
        }

        public bindForSubMesh(world: Matrix, mesh: Mesh, subMesh: SubMesh): void {
            var scene = this.getScene();

            var defines = <TerrainMaterialDefines>subMesh._materialDefines;
            if (!defines) {
                return;
            }

            var effect = subMesh.effect;
            this._activeEffect = effect;

            // Matrices        
            this.bindOnlyWorldMatrix(world);
            this._activeEffect.setMatrix("viewProjection", scene.getTransformMatrix());

            // Bones
            MaterialHelper.BindBonesParameters(mesh, this._activeEffect);

            if (this._mustRebind(scene, effect)) {
                // Textures        
                if (this.mixTexture) {
                    this._activeEffect.setTexture("textureSampler", this._mixTexture);
                    this._activeEffect.setFloat2("vTextureInfos", this._mixTexture.coordinatesIndex, this._mixTexture.level);
                    this._activeEffect.setMatrix("textureMatrix", this._mixTexture.getTextureMatrix());
                    
                    if (StandardMaterial.DiffuseTextureEnabled) {
                        if (this._diffuseTexture1) {
                            this._activeEffect.setTexture("diffuse1Sampler", this._diffuseTexture1);
                            this._activeEffect.setFloat2("diffuse1Infos", this._diffuseTexture1.uScale, this._diffuseTexture1.vScale);
                        }
                        if (this._diffuseTexture2) {
                            this._activeEffect.setTexture("diffuse2Sampler", this._diffuseTexture2);
                            this._activeEffect.setFloat2("diffuse2Infos", this._diffuseTexture2.uScale, this._diffuseTexture2.vScale);
                        }
                        if (this._diffuseTexture3) {
                            this._activeEffect.setTexture("diffuse3Sampler", this._diffuseTexture3);
                            this._activeEffect.setFloat2("diffuse3Infos", this._diffuseTexture3.uScale, this._diffuseTexture3.vScale);
                        }
                    }
                    
                    if (StandardMaterial.BumpTextureEnabled && scene.getEngine().getCaps().standardDerivatives) {
                        if (this._bumpTexture1) {
                            this._activeEffect.setTexture("bump1Sampler", this._bumpTexture1);
                        }
                        if (this._bumpTexture2) {
                            this._activeEffect.setTexture("bump2Sampler", this._bumpTexture2);
                        }
                        if (this._bumpTexture3) {
                            this._activeEffect.setTexture("bump3Sampler", this._bumpTexture3);
                        }
                    }
                }
                // Clip plane
                MaterialHelper.BindClipPlane(this._activeEffect, scene);

                // Point size
                if (this.pointsCloud) {
                    this._activeEffect.setFloat("pointSize", this.pointSize);
                }

                this._activeEffect.setVector3("vEyePosition", scene._mirroredCameraPosition ? scene._mirroredCameraPosition : scene.activeCamera.position);                
            }

            this._activeEffect.setColor4("vDiffuseColor", this.diffuseColor, this.alpha * mesh.visibility);
            
            if (defines.SPECULARTERM) {
                this._activeEffect.setColor4("vSpecularColor", this.specularColor, this.specularPower);
            }

            if (scene.lightsEnabled && !this.disableLighting) {
                MaterialHelper.BindLights(scene, mesh, this._activeEffect, defines, this.maxSimultaneousLights);
            }

            // View
            if (scene.fogEnabled && mesh.applyFog && scene.fogMode !== Scene.FOGMODE_NONE) {
                this._activeEffect.setMatrix("view", scene.getViewMatrix());
            }

            // Fog
            MaterialHelper.BindFogParameters(scene, mesh, this._activeEffect);

            this._afterBind(mesh, this._activeEffect);
        }

        public getAnimatables(): IAnimatable[] {
            var results = [];

            if (this.mixTexture && this.mixTexture.animations && this.mixTexture.animations.length > 0) {
                results.push(this.mixTexture);
            }

            return results;
        }

        public getActiveTextures(): BaseTexture[] {
            var activeTextures = super.getActiveTextures();

            if (this._mixTexture) {
                activeTextures.push(this._mixTexture);
            }

            if (this._diffuseTexture1) {
                activeTextures.push(this._diffuseTexture1);
            }

            if (this._diffuseTexture2) {
                activeTextures.push(this._diffuseTexture2);
            }

            if (this._diffuseTexture3) {
                activeTextures.push(this._diffuseTexture3);
            }

            if (this._bumpTexture1) {
                activeTextures.push(this._bumpTexture1);
            }

            if (this._bumpTexture2) {
                activeTextures.push(this._bumpTexture2);
            }

            if (this._bumpTexture3) {
                activeTextures.push(this._bumpTexture3);
            }

            return activeTextures;
        }

        public dispose(forceDisposeEffect?: boolean): void {
            if (this.mixTexture) {
                this.mixTexture.dispose();
            }

            super.dispose(forceDisposeEffect);
        }
        
        public clone(name: string): TerrainMaterial {
            return SerializationHelper.Clone(() => new TerrainMaterial(name, this.getScene()), this);
        }

        public serialize(): any {
            var serializationObject = SerializationHelper.Serialize(this);
            serializationObject.customType = "BABYLON.TerrainMaterial";
            return serializationObject;
        }

        // Statics
        public static Parse(source: any, scene: Scene, rootUrl: string): TerrainMaterial {
            return SerializationHelper.Parse(() => new TerrainMaterial(source.name, scene), source, scene, rootUrl);
        }
    }
}