export default class ch_sign{
    private static _instance:ch_sign;
    public static getInstance():ch_sign{
        if(!this._instance) this._instance = new ch_sign();
        return this._instance;
    }
    private _sign_data:Set<number>=new Set();
    private _max:number = 7;
    private _creat_date:number=0;
    private _sign_count:number=0;
    private _mode:number=1;
    /**设定的签到天数*/
    public get max_day():number{return this._max;}
    private getCreatDayCount():number{
        if(this._creat_date==0){
            chsdk.log.warn("签到模块没有初始化");
            return 0;
        }
        return chsdk.date.getDiffDayNum(this._creat_date,chsdk.date.now())+1;
    }
    /**
     * 签到初始化
     * @param mode =1可以补签 =2不可补签
     * @param data 签到存档数据，可以为空为第一天
     * @param max_day 签到最大天数
     */
    public init(mode:1|2,data:{sign_list:number[],creat_date:number}|{sign_count:number,last_date:number}|null,max_day:number=7):void{
        this._mode=mode;
        if(this._mode==1){
            if(data){
                data =data as {sign_list:number[],creat_date:number};
                const sign_list=data.sign_list ?? [];
                const creat_date=data.creat_date ?? chsdk.date.now();
                for(let i=0;i<sign_list.length;i++)this._sign_data.add(sign_list[i]);
                this._sign_count=this._sign_data.size;
                this._creat_date=creat_date;
            }else{
                this._sign_count=0;
                this._sign_data.clear();
                this._creat_date=chsdk.date.now();
            }
        }else{
            if(data){
                data = data as {sign_count:number,last_date:number};
                this._sign_count=data.sign_count ?? 0;
                this._creat_date=data.last_date ?? 0;
            }else{
                this._sign_count=0;
                this._creat_date=0; 
            }
        }
        this._max=max_day;
    }
    /**已签到的数据，用于存档*/
    public getSignData():{sign_list:number[],creat_date:number}|{sign_count:number,last_date:number}{
        if(this._mode==1){
           return {sign_list:Array.from(this._sign_data.keys()),creat_date:this._creat_date};  
        }else if(this._mode==2){
           return {sign_count:this._sign_count,last_date:this._creat_date};  
        }
    }
    /** 返回某一天的状态
     *  0 等待签到 
     *  1 已经签到 
     *  2 失效等待补签
     * */
    public checkSigineState(day:number):number{
        if(this._mode==1){
            if(day<1 || day>this._max)return 0;
            if(this._sign_data.has(day))return 1;
            const count = this.getCreatDayCount();
            if(count <=0) return 0;
            if(day <count) return 2;
        }else if(this._mode==2){
            if(day<=this._sign_count) return 1;
        }
        return 0;
    }
    /**今天是否可以签到*/
    public checkSigin():boolean{
        if(this._mode==1){
           const count = this.getCreatDayCount();
           if(count<=0 || count>this._max)return false;
           return !this._sign_data.has(count);
        }else if(this._mode==2){
           const count = this._sign_count;
           if(count>=this._max)return false;
           return !chsdk.date.isSameDate(this._creat_date,chsdk.date.now());
        }
        return false;
    }
    /**签到是否全部完成*/
    public checkSiginComplete():boolean{
        const count = this._sign_count;
        return count>=this._max;
    }
    /**
     * 是否能补签
     * 不能返回0,
     * 可以补签返回可以补签的那一天*/
    public checkReSigin():number{
        if(this._mode!=1) return 0;
        let count = this.getCreatDayCount()-1;
        if(count<=0)return 0;
        if(count>this._max)count=this._max;
        for(let i=1;i<=count;i++){
            if(!this._sign_data.has(i)) return i;
        }
        return 0;
    }
    /**签到
     * 失败返回 0
     * 成功返回签到当天
    */
    public  signIn(): number {  
        if (!this.checkSigin()) {  
            return 0;
        }
        if(this._mode==1){
           const day = this.getCreatDayCount();  
           this._sign_data.add(day); 
           this._sign_count=this._sign_data.size;
           return day;
        }else  if(this._mode==2){
            this._sign_count++;
            this._creat_date=chsdk.date.now();
            return this._sign_count;
        }
        return 0;
    }
    /**补签
    * 失败返回 0
    * 成功返回补签那天
    */
    public reSignIn():number{
        if(this._mode!=1)return 0;
        const index = this.checkReSigin();
        if(index<=0 || index>this._max){
            return 0;
        }
        this._sign_data.add(index);
        this._sign_count=this._sign_data.size;
        return index;
    }
    //
}