let expGain = 100;
let levelData = { "1": "0", "2": "10", "3": "17", "4": "27", "5": "40",
                    "6": "56", "7":"75", "8":"98", "9":"124", "10":"153" }

let i = 0;

interface ILevelInfo {
    level: number;
    currentExp: number;
    toNextLvExp: number;
    totalExp: number;
}

let levelInfo: ILevelInfo = {
    level: 1,
    currentExp: 0,
    toNextLvExp: 10,
    totalExp: 0
}

levelInfo = levelUp(expGain, levelData, levelInfo);
levelInfo.totalExp += expGain;

function levelUp(expGain: number, levelData: any, info: ILevelInfo): ILevelInfo {
    if (expGain < info.toNextLvExp) {
        //expGain = -expGain;
        info.currentExp += expGain;
        info.toNextLvExp -= info.currentExp;

        return info;
    } else if (expGain >= info.toNextLvExp) {
        console.log(expGain + " - " + info.toNextLvExp + " = " + (expGain-info.toNextLvExp));
        let leftOver = expGain - info.toNextLvExp;
        info.level++;
        info.toNextLvExp = parseInt(levelData[info.level+1]);
        info.currentExp = 0;

        return levelUp(leftOver, levelData, info);
    }

    return info;
}

console.log("level = " + levelInfo.level);
console.log("currentExp = " + levelInfo.currentExp);
console.log("totalExp = " + levelInfo.totalExp);
console.log("toNextExp = " + levelInfo.toNextLvExp);