/**
 * The standard format will be "YYYY-MM-DD HH:mm:ss",
 * this applies to all the functions.
 */
export interface formatOptions{
    time?: boolean,
    asObject?: boolean
}
export interface ObjectifiedDate{
    Y: number,
    M: number,
    D: number,
    h?: number,
    m?: number,
    s?: number
}
const toMs = (
    h: number = 0, 
    m: number = 0, 
    s: number = 0,
    ms: number = 0
): number => {
    return (h * 3600000+m * 60000 +s * 1000 +ms)
}
const toSeconds = (
    h: number = 0, 
    m: number = 0, 
    s: number = 0,
    ms: number = 0
): number => {
    return (h * 3600 + m * 60 +s + ms / 1000)
}
const toMinutes = (
    h: number = 0, 
    m: number = 0, 
    s: number = 0,
    ms: number = 0
): number => {
    return (
        h * 60 +
        m +
        s / 60 +
        ms / 60000
    )
}
const toHours = (
    h: number = 0, 
    m: number = 0, 
    s: number = 0,
    ms: number = 0
): number => {
    return (
        h +
        m / 60 +
        s / 3600 +
        ms / 1800000
    )
}
export const isDateObject = (d: any) => Object.prototype.toString.call(d) === "[object Date]";

export const FromTime = {
    
    jpnDayMap:{
        0: "日",
        1: "月",
        2: "火",
        3: "水",
        4: "木",
        5: "金",
        6: "土",
    } as {[key: number]: string},
    toMs, toSeconds, toMinutes, toHours,
    /**
     * Format date object into "YYYY-MM-DD HH:mm:ss" aka the best format.
     * @param date Date object
     * @param time 
     * @returns formatted string.
     */
    format(date: Date, options: formatOptions = {}, ): string | ObjectifiedDate{
        const defaultOptions = {time: true, asObject: false}
        options = {...defaultOptions, ...options};
        const iso = date.toISOString();
        if(options.time){
            if(options.asObject)
                return{
                    Y: Number(iso.slice(0,4)),
                    M: Number(iso.slice(5,7)),
                    D: Number(iso.slice(8,10)),
                    h: Number(iso.slice(11,13)),
                    m: Number(iso.slice(14,16)),
                    s: Number(iso.slice(17,19))
                }
            return `${iso.slice(0,10)} ${iso.slice(11, 19)}`
        }
        if(options.asObject)
            return{
                Y: Number(iso.slice(0,4)),
                M: Number(iso.slice(5,7)),
                D: Number(iso.slice(8,10)),
            }
        return iso.slice(0,10);
    },
    /**
     * Convert to readable x shotest possible date length.
     * Year > Month > Day > Same day > time only.
     * currently support jpn only
     * @params input The input date string
     * @locale language, default = jpn
    */
    toDateTimeShortLocale(input: string, locale: string = "jpn"): string{
        const date: Date = new Date(input);
        const currentDate: Date = new Date();
        if(!currentDate) return input;
    
        if(currentDate.getFullYear() !== date.getFullYear()){
            return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2,'0')}-${String(date.getDate()).padStart(2,'0')}`
        }
        if(currentDate.getMonth() !== date.getMonth()){
            switch(locale){
                case "jpn":
                    return `${date.getMonth() + 1}月${date.getDate()}日`;
            }
        }
        if(currentDate.getDate() !== date.getDate()){
            switch(locale){
                case "jpn":
                    return `${date.getDate()}日${this.jpnDayMap[date.getDay()]}`;
            }
        }
        switch(locale){
            case "jpn":
                return `${String(date.getHours()).padStart(2,'0')}:${String(date.getMinutes()).padStart(2,'0')}`;
            default: return "";
        }
    },
}




export class cDate{

    private _date: ObjectifiedDate;

    constructor(date: string | Date){
        if(isDateObject(date)) 
            this._date = FromTime.format(date as Date, {asObject: true}) as ObjectifiedDate;
        else 
            this._date = FromTime.format(new Date(date) as Date, {asObject: true}) as ObjectifiedDate;
    }

    // AddData
    addMonth(n: number){
        const _d = new Date();
        _d.setHours(this._date.h ?? 0, this._date.m, this._date.s);
        console.log(this.dateTime)
        console.log(_d)
        _d.setMonth(_d.getMonth()+n);
        this._date = FromTime.format(_d as Date, {asObject: true}) as ObjectifiedDate;
    }

    get dateTime(){
        return `${this._date.Y}-${String(this._date.M).padStart(2,'0')}-${String(this._date.D).padStart(2,'0')} ${String(this._date.h).padStart(2,'0')}:${String(this._date.m).padStart(2,'0')}:${String(this._date.s).padStart(2,'0')}`
    }

    get date(){ return `${this._date.Y}-${String(this._date.M).padStart(2,'0')}-${String(this._date.D).padStart(2,'0')}` }

    get time(){ return `${String(this._date.h).padStart(2,'0')}:${String(this._date.m).padStart(2,'0')}:${String(this._date.s).padStart(2,'0')}` }

}