import { Nullable } from "babylonjs/types";
import { serializeAsTexture, serialize, expandToProperty, serializeAsColor3, SerializationHelper } from "babylonjs/Misc/decorators";
import { Matrix } from "babylonjs/Maths/math.vector";
import { Color3 } from "babylonjs/Maths/math.color";
import { BaseTexture } from "babylonjs/Materials/Textures/baseTexture";
import { EffectFallbacks, EffectCreationOptions } from "babylonjs/Materials/effect";
import { MaterialDefines } from "babylonjs/Materials/materialDefines";
import { MaterialHelper } from "babylonjs/Materials/materialHelper";
import { PushMaterial } from "babylonjs/Materials/pushMaterial";
import { MaterialFlags } from "babylonjs/Materials/materialFlags";
import { VertexBuffer } from "babylonjs/Meshes/buffer";
import { AbstractMesh } from "babylonjs/Meshes/abstractMesh";
import { SubMesh } from "babylonjs/Meshes/subMesh";
import { Mesh } from "babylonjs/Meshes/mesh";
import { Scene } from "babylonjs/scene";
import { _TypeStore } from 'babylonjs/Misc/typeStore';
import { IAnimatable } from 'babylonjs/Animations/animatable.interface';

import "./cell.fragment";
import "./cell.vertex";

class CellMaterialDefines extends MaterialDefines {
    public DIFFUSE = false;
    public CLIPPLANE = false;
    public CLIPPLANE2 = false;
    public CLIPPLANE3 = false;
    public CLIPPLANE4 = false;
    public ALPHATEST = false;
    public POINTSIZE = false;
    public FOG = 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 NDOTL = true;
    public CUSTOMUSERLIGHTING = true;
    public CELLBASIC = true;
    public DEPTHPREPASS = false;

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

export class CellMaterial extends PushMaterial {
    @serializeAsTexture("diffuseTexture")
    private _diffuseTexture: BaseTexture;
    @expandToProperty("_markAllSubMeshesAsTexturesDirty")
    public diffuseTexture: BaseTexture;

    @serializeAsColor3("diffuse")
    public diffuseColor = new Color3(1, 1, 1);

    @serialize("computeHighLevel")
    public _computeHighLevel: boolean = false;
    @expandToProperty("_markAllSubMeshesAsTexturesDirty")
    public computeHighLevel: boolean;

    @serialize("disableLighting")
    private _disableLighting = false;
    @expandToProperty("_markAllSubMeshesAsLightsDirty")
    public disableLighting: boolean;

    @serialize("maxSimultaneousLights")
    private _maxSimultaneousLights = 4;
    @expandToProperty("_markAllSubMeshesAsLightsDirty")
    public maxSimultaneousLights: number;

    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(): Nullable<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 CellMaterialDefines();
        }

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

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

        var engine = scene.getEngine();

        // Textures
        if (defines._areTexturesDirty) {
            defines._needUVs = false;
            if (scene.texturesEnabled) {
                if (this._diffuseTexture && MaterialFlags.DiffuseTextureEnabled) {
                    if (!this._diffuseTexture.isReady()) {
                        return false;
                    } else {
                        defines._needUVs = true;
                        defines.DIFFUSE = true;
                    }
                }
            }
        }

        // High level
        defines.CELLBASIC = !this.computeHighLevel;

        // Misc.
        MaterialHelper.PrepareDefinesForMisc(mesh, scene, false, this.pointsCloud, this.fogEnabled, this._shouldTurnAlphaTestOn(mesh), 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 ? true : false);

        // 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);

            var shaderName = "cell";
            var join = defines.toString();
            var uniforms = ["world", "view", "viewProjection", "vEyePosition", "vLightsType", "vDiffuseColor",
                "vFogInfos", "vFogColor", "pointSize",
                "vDiffuseInfos",
                "mBones",
                "vClipPlane", "vClipPlane2", "vClipPlane3", "vClipPlane4", "diffuseMatrix"
            ];
            var samplers = ["diffuseSampler"];
            var uniformBuffers = new Array<string>();

            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 - 1 }
                }, engine), defines);

        }
        if (!subMesh.effect || !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 = <CellMaterialDefines>subMesh._materialDefines;
        if (!defines) {
            return;
        }

        var effect = subMesh.effect;
        if (!effect) {
            return;
        }
        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._diffuseTexture && MaterialFlags.DiffuseTextureEnabled) {
                this._activeEffect.setTexture("diffuseSampler", this._diffuseTexture);

                this._activeEffect.setFloat2("vDiffuseInfos", this._diffuseTexture.coordinatesIndex, this._diffuseTexture.level);
                this._activeEffect.setMatrix("diffuseMatrix", this._diffuseTexture.getTextureMatrix());
            }

            // Clip plane
            MaterialHelper.BindClipPlane(this._activeEffect, scene);

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

            MaterialHelper.BindEyePosition(effect, scene);
        }

        this._activeEffect.setColor4("vDiffuseColor", this.diffuseColor, this.alpha * mesh.visibility);

        // Lights
        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._diffuseTexture && this._diffuseTexture.animations && this._diffuseTexture.animations.length > 0) {
            results.push(this._diffuseTexture);
        }

        return results;
    }

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

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

        return activeTextures;
    }

    public hasTexture(texture: BaseTexture): boolean {
        if (super.hasTexture(texture)) {
            return true;
        }

        return this._diffuseTexture === texture;
    }

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

        super.dispose(forceDisposeEffect);
    }

    public getClassName(): string {
        return "CellMaterial";
    }

    public clone(name: string): CellMaterial {
        return SerializationHelper.Clone<CellMaterial>(() => new CellMaterial(name, this.getScene()), this);
    }

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

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

_TypeStore.RegisteredTypes["BABYLON.CellMaterial"] = CellMaterial;