class Vacation {
    constructor(organizer, destination, budget) {
        this.organizer = organizer;
        this.destination = destination;
        this.budget = budget;
        this.kids = {};
        this.grade = {};
        this.countKids = 0;
    }

    registerChild(name, grade, budget) {
        let isNotThere = true;
        if (budget < this.budget) {
            return `${name}'s money is not enough to go on vacation to ${this.destination}.`;
        }

        for (let kidsKey in this.kids) {
            if (this.kids[kidsKey].grade === grade) {
                for (let x of this.grade[this.kids[kidsKey].grade]) {
                    if (x.split('-')[0] === name) {
                        isNotThere = false;
                        return `${name} is already in the list for this ${this.destination} vacation.`;
                    }
                }
            }
        }
        if (isNotThere) {
            if (typeof this.kids[`${name}`] !== 'undefined') {
                if (this.kids[`${name}`].name !== name || this.kids[`${name}`].grade !== grade) {
                    this.kids[`${name}${this.countKids++}`] = {name, grade, budget};
                }
            }else {
                this.kids[`${name}`] = {name, grade, budget};
            }
            if (typeof this.grade[`${grade}`] === "undefined") {
                this.grade[`${grade}`] = [];
            }
            this.grade[`${grade}`].push(`${name}-${budget}`)
        }

        return this.grade[`${grade}`];
    }

    removeChild(name, grade) {
        let isNotExist = true;
        for (let x in this.grade[grade]) {
            let [nameKid, budget] = this.grade[grade][x].split('-');
            if (nameKid === name) {
                isNotExist = false;
                this.grade[grade].splice(x, 1);
                this.kids[`${name}`] = '';
            }
        }



        if (isNotExist) {
            return `We couldn't find ${name} in ${grade} grade.`
        }

        return this.grade[grade];
    }

    get numberOfChildren() {
        let count = 0;
        for (let kidsKey in this.kids) {
            if (this.kids[kidsKey] !== ''){
                count++;
            }
        }
        return count;
    }

    toString() {
        let res = '';
        let count = 0;
        let isThereEl = true;
        res += `${this.organizer} will take ${this.numberOfChildren} children on trip to ${this.destination}\n`;

        for (let gradeKey in this.grade) {
            isThereEl = false;
            res += `Grade: ${gradeKey}\n`;
            let count = 1;
            for (let x of this.grade[gradeKey]) {
                res += `${count}. ${x}\n`;
                count++;
            }
        }

        if (isThereEl){
            res = `No children are enrolled for the trip and the organization of ${this.organizer} falls out...Check the example below for more clarity.`
        }

        return res;
    }
}