//mesh对象池
//为避免重复加载、销毁mesh对象

import { AbstractMesh, MeshBuilder, Observable, TransformNode, Vector3 } from "@babylonjs/core";
import { SceneManager } from "../controller/scene-manager";
import { ModelData, ModelType } from "../model/data/model-data/model-data";
import { ModelInfo } from "../model/info/model/model-info";
import { TsTool } from "./ts-tool";

export class MeshPool {

    //#region 单例
    private static instance: MeshPool;

    static get Instance() {
        if (MeshPool.instance == null) {
            MeshPool.instance = new MeshPool();
        }

        return MeshPool.instance;
    }
    //#endregion


    root: TransformNode;

    prefabPool: Map<string, MeshPoolInfo[]> = new Map();//预制体池
    idlePool: Map<string, MeshPoolInfo[]> = new Map();//空闲池
    workingPool: Map<string, MeshPoolInfo[]> = new Map();//工作池

    constructor() {
        this.root = new TransformNode("MeshPoolRoot", SceneManager.Instance.scene);

        this.root.setEnabled(false);//隐藏起来
    }

    //#region 外部方法

    /**
     * 从对象池导入模型（经过包装盒包装）
     */
    static importMesh(modeltype: ModelType, modelData: ModelData, isNew: boolean = true, fromClone: boolean = true, tag?: string, onSuccess?: (meshBox: AbstractMesh, meshes: AbstractMesh[], result: MeshPoolInfo) => void, onlyPrefab = false,): MeshPoolInfo {
        let result = MeshPool.Instance.getMesh(modelData.resPath, modelData.resName, fromClone);

        if (result == null) {
            //console.log("对象池中没有，要加载：" + path + name);

            let prefab = MeshPool.Instance.getMeshPrefab(modelData.resPath, modelData.resName);
            result = new MeshPoolInfo(modelData.resPath, modelData.resName, fromClone);
            if (prefab == null) {
                prefab = new MeshPoolInfo(modelData.resPath, modelData.resName, false);
                prefab.onSuccessObserver = new Observable<MeshPoolInfo>();
                MeshPool.Instance.addPool(MeshPool.Instance.prefabPool, prefab);

                SceneManager.createModel(modeltype, modelData, true, isNew, tag, (meshes: AbstractMesh[], box: AbstractMesh, modelInfo: ModelInfo) => {
                    prefab.meshes = meshes;
                    prefab.meshBox = box;
                    prefab.modelInfo = modelInfo;
                    prefab.setActive(false);
                    modelInfo.showFollowUI(false);
                    prefab.success();
                    MeshPool.Instance.addPool(MeshPool.Instance.prefabPool, prefab);
                    if (!onlyPrefab) {
                        if (fromClone) {
                            result.cloneMeshFrom(prefab, modelData, isNew);
                            result.setActive(true);
                            MeshPool.Instance.addPool(MeshPool.Instance.workingPool, result);
                            result.success();
                            if (onSuccess) {
                                onSuccess(result.meshBox, result.meshes, result);
                            }
                        }
                        else {
                            SceneManager.createModel(modeltype, modelData, true, isNew, tag, (meshes: AbstractMesh[], box: AbstractMesh, modelInfo: ModelInfo) => {
                                result.meshBox = box;
                                result.meshes = meshes;
                                result.modelInfo = modelInfo;
                                result.setActive(true);
                                modelInfo.showFollowUI(false);
                                result.success();
                                MeshPool.Instance.addPool(MeshPool.Instance.workingPool, result);
                                if (onSuccess) {
                                    onSuccess(result.meshBox, result.meshes, result);
                                }
                            })
                        }
                    }

                })
                return result;

            }
            else {
                if (fromClone) {
                    if (prefab.meshBox == null) {
                        // console.log("找到了预制体，但是还没加载完")
                        prefab.onSuccessObserver.add((eventData: MeshPoolInfo) => {
                            // console.log("加载回调");
                            result.cloneMeshFrom(prefab, modelData, isNew);
                            result.setActive(true);
                            MeshPool.Instance.addPool(MeshPool.Instance.workingPool, result);
                            result.success();
                            if (onSuccess) {
                                onSuccess(result.meshBox, result.meshes, result);
                            }
                        })
                        return result;
                    }
                    else {
                        result.cloneMeshFrom(prefab, modelData, isNew);
                        result.setActive(true);
                        MeshPool.Instance.addPool(MeshPool.Instance.workingPool, result);
                        result.success();
                        if (onSuccess) {
                            onSuccess(result.meshBox, result.meshes, result);
                        }
                        return result;
                    }


                }
                else {
                    SceneManager.createModel(modeltype, modelData, true, isNew, tag, (meshes: AbstractMesh[], box: AbstractMesh, modelInfo: ModelInfo) => {
                        result.meshBox = box;
                        result.meshes = meshes;
                        result.modelInfo = modelInfo;
                        result.setActive(true);
                        modelInfo.showFollowUI(false);
                        MeshPool.Instance.addPool(MeshPool.Instance.workingPool, result);
                        result.success();
                        if (onSuccess) {
                            onSuccess(result.meshBox, result.meshes, result);
                        }
                    })
                    return result;
                }
            }
        }
        else {
            // console.log("从对象池取出" + result.key);
            MeshPool.Instance.removePool(MeshPool.Instance.idlePool, result);
            MeshPool.instance.addPool(MeshPool.Instance.workingPool, result);
            result.setActive(true);
            result.success();
            if (onSuccess && result.meshBox != null) {
                onSuccess(result.meshBox, result.meshes, result);
            }
        }
        return result;
    }

    /**
     * 放回到对象池（从工作池放入空闲池）
     * @param meshPoolInfo 
     */
    static disposeMesh(meshPoolInfo: MeshPoolInfo) {
        MeshPool.Instance.removePool(MeshPool.Instance.workingPool, meshPoolInfo);
        MeshPool.Instance.addPool(MeshPool.Instance.idlePool, meshPoolInfo);
        meshPoolInfo.setActive(false);
    }

    //#endregion

    //#region 内部方法

    getMesh(path: string, name: string, fromClone: boolean = true): MeshPoolInfo {
        let result: MeshPoolInfo = null;
        let resKey = path + name;

        let poolList = MeshPool.Instance.idlePool.get(resKey);

        if (poolList != null && poolList.length > 0) {
            for (let i = 0; i < poolList.length; i++) {
                if (poolList[i].fromClone == fromClone) {
                    result = poolList[i];
                    break;
                }
            }

        }
        else {
            //console.log("对象池取出失败" + name);
        }
        return result;
    }



    //放入某池
    addPool(pool: Map<string, MeshPoolInfo[]>, value: MeshPoolInfo) {
        let poolInfo = pool.get(value.key);
        if (poolInfo == null) {
            poolInfo = [];
            pool.set(value.key, poolInfo);
        }
        poolInfo.push(value);
    }

    //移除池
    removePool(pool: Map<string, MeshPoolInfo[]>, value: MeshPoolInfo) {
        let poolInfo = pool.get(value.key);
        if (poolInfo == null) {
            console.error("removePool no key" + value.key);
            return;
        }
        TsTool.arrayRemove(poolInfo, value);
    }


    /**
 * 从预制体池中取出
 */
    getMeshPrefab(path: string, name: string): MeshPoolInfo {
        let result: MeshPoolInfo = null;
        let resKey = path + name;

        let poolList = MeshPool.Instance.prefabPool.get(resKey);
        if (poolList != null && poolList.length > 0) {
            result = poolList[0];
        }
        else {

        }

        return result;
    }

    //#endregion

}

/**
 * 对象池元数据
 */
export class MeshPoolInfo {
    key: string;
    resPath: string;//资源路径，
    resName: string;
    meshBox: AbstractMesh;//对象
    fromClone: boolean;//来自克隆

    meshes: AbstractMesh[];//所有mesh节点
    active: boolean;
    modelInfo: ModelInfo;

    onSuccessObserver: Observable<MeshPoolInfo>;

    constructor(resPath: string, resName: string, fromClone: boolean = true, mesh?: AbstractMesh, meshes?: AbstractMesh[], modelInfo?: ModelInfo) {
        this.key = resPath + resName;
        this.resPath = resPath;
        this.resName = resName;
        this.fromClone = fromClone;
        this.meshBox = mesh;
        this.meshes = meshes;
        this.modelInfo = modelInfo;

    }

    setActive(active: boolean) {
        if (this.meshBox != null) {

            if (active) {
                this.meshBox.setParent(null);
                let allNode = this.meshBox.getChildTransformNodes();
                for (let i = 0; i < allNode.length; i++) {
                    allNode[i].setEnabled(true);
                }
                this.meshBox.setEnabled(true);
            }
            else {

                this.meshBox.setParent(MeshPool.Instance.root);
                this.meshBox.position = Vector3.Zero();
                // this.meshBox.setEnabled(false);

                // console.log("放入对象池" + this.meshBox.name);
            }
        }
    }

    /**
     * 导入完成
     */
    success() {
        if (this.onSuccessObserver != null) {
            // console.log("导入完成", this.onSuccessObserver.observers);
            this.onSuccessObserver.notifyObservers(this);
            this.onSuccessObserver.clear();
        }

    }

    clone() {
        let modelInfo = this.modelInfo.clone();
        let newMesh = new MeshPoolInfo(this.resPath, this.resName, true, modelInfo.modelBox, modelInfo.models, modelInfo);
        return newMesh;
    }

    /**
     * 从预制体克隆mesh
     * @param prefab 
     */
    cloneMeshFrom(prefab: MeshPoolInfo, modelData?: ModelData, isNew: boolean = true) {
        let modelInfo = prefab.modelInfo.clone(modelData, isNew);
        this.meshBox = modelInfo.modelBox;
        this.modelInfo = modelInfo;
        // let box = MeshBuilder.CreateBox("box", { size: 1 }); //用于测试阴影
        // box.setParent(modelInfo.modelBox);
        // box.position = new Vector3(0, 2, 0);
        if (SceneManager.s_openShadow) {
            SceneManager.Instance.shadowGenerator.addShadowCaster(modelInfo.modelBox, true);
            // console.log("添加到阴影", modelInfo.modelBox.name);
        }

    }

    dispose() {
        this.modelInfo.dispose();
    }
}