/**注册一个继承IFMS的状态类型 */
export function FMSRegister(name: string) {
    return function (target:any) {
           const instance = new target() as IFMS;
           instance.type=name;
           FMS.IFMS.set(name, instance);
    }
}
/**状态接口*/
export interface IFMS{
    type: string;
    onEntry: () => void;
    onExit: () => void;
}
/**全局状态机,游戏流程 (私有有行为机更灵活)*/
export class FMS<T extends string>{
    static IFMS: Map<string,IFMS> = new Map();
    private _current:IFMS;
    /**当前状态*/
    get Current():IFMS{return this._current};
    get CurrentType():string{
        
        return this._current ? this._current.type:null
    };
    /**初始1个状态*/
    public Init(type:string):void{
        this.Change(type as T);
    }
    /**切换状态*/
    public Change(type:T):void{
        
        if(this._current)this._current.onExit();
        this._current = FMS.IFMS.get(type );
        if(this._current)this._current.onEntry();
    }
}
/**例子:
@FMSRegister("Init")
export class FMSInit implements IFMS{
    type: string;
    onExit: () => void;
    onEntry():void{
         console.log(this.type,"---------------------");
    }
}
*/