import { EP } from "@/enmu";
import { Container } from "pixi.js";
import Game from "./Game";

type TStage = {
    type: EP,
    name: string,
    stage: Container
}

export default class Stage {
    private static instance: Stage = null
    private _stages: Record<string,TStage>= {}
    curStage: TStage = null

    static getInstance(){
        if(Stage.instance == null){
            Stage.instance = new Stage()
        }
        return Stage.instance
    }
    gameManager: Game = null
    constructor(){
        this.gameManager = Game.getInstance();
    }

    private _wscb:  ((stage: TStage, lastStage?:TStage)=>void)[]= []
    watchStageChange(cb: (stage: TStage, lastStage?:TStage)=>void){
        this._wscb.push(cb)
    }

    initStage(name: string){
        if(!this._stages[name]){
            throw new Error("不存在该舞台")
        }
        let curStage = this._stages[name];
        this.curStage = curStage
        // this.gameManager.stage.children.forEach(stage=>{
        //     stage.destroy()
        //     this.gameManager.stage.removeChild(stage)
        // })
        if(curStage&&curStage.type === EP.Normal){
            this.gameManager.stage.addChild(curStage.stage)
        }else if(curStage&&curStage.type === EP.Resident){
            curStage.stage.visible = true
        }
        this._wscb.forEach(v=>v(curStage))
    }
    
    changeStage(name: string){
        if(!this._stages[name]){
            throw new Error("不存在该舞台")
        }
        if(!this.curStage){
            console.warn("请先初始化一个场景")
            return
        }
        let lastStage = this.curStage
        if(lastStage&&lastStage.type === EP.Normal){
            this.gameManager.stage.removeChild(lastStage.stage)
        }else if(lastStage&&lastStage.type === EP.Resident){
            lastStage.stage.visible = false
        }
        let curStage = this._stages[name];
        if(curStage && typeof curStage === "string"){
            this.create(name, EP.Normal)
            curStage = this._stages[name]
            console.log(curStage);
            
        }
        this.curStage = curStage
        if(curStage&&curStage.type === EP.Normal){
            this.gameManager.stage.addChild(curStage.stage)
        }else if(curStage&&curStage.type === EP.Resident){
            curStage.stage.visible = true
        }
        this._wscb.forEach(v=>v(curStage, lastStage))

        if(lastStage&&lastStage.type === EP.Normal){
            lastStage.stage.destroy()
            this._stages[lastStage.name] = "已销毁" as any
        }
    }

    getStage(name: string, type: EP = EP.Normal): Container{
        if(name === "root"){
            throw new Error("最好换过一个名字")
        }
        if(this._stages[name]){
            throw new Error("已存在该舞台")
        }
        if(!this._stages[name]){
            this.create(name, type)
        }
        return this._stages[name].stage
    }
    
    private create(name: string, type: EP = EP.Normal): Container{
        const stage = new Container();
        stage.name = name
        this._stages[name] = {
            type: type,
            stage: stage,
            name: name
        } 
        if(type === EP.Resident){
            stage.visible = false
            this.gameManager.stage.addChild(stage)
        }
        return stage
    }
}