let experienceYields = {
    "Porygon2": 180,
    "Hypno": 169,
    "Meowth": 58,
    "Rowlet": 64,
    "Dartrix": 147,
    // ...
};

function gamefreakSqrt(n) {
    let actualSqrt = Math.sqrt(n);
    let lowerBound = Math.floor(actualSqrt);
    if(lowerBound * lowerBound === n) {
        return lowerBound * 4096;
    }

    let bestCoeff = 0;
    let bestDistance = actualSqrt - lowerBound;
    for (let i = 1; i <= 4096; i++) {
        let check = lowerBound + i / 4096;
        let distance = Math.abs(actualSqrt - check);
        if (distance < bestDistance) {
            bestCoeff = i;
            bestDistance = distance;
        }
    }
    return lowerBound * 4096 + bestCoeff;
}

function getExperienceForKill(foeName, foeLevel, level, luckyEgg, affection, rotoExp, expShare, tradeExp, evolutionDue, expScaling, gen7, wild) {
    let expYield = experienceYields[foeName];

    if (typeof expYield === "undefined") {
        throw new Error("Unknown Pokémon: " + foeName);
    }

    let log = false;

    if (expScaling) {
        let x = foeLevel + foeLevel + 10;
        let y = foeLevel + level + 10;

        let x2 = x * x;
        let y2 = y * y;

        let z = Math.floor(expYield * foeLevel / 5);
        if (expShare) {
            z = Math.floor(z / 2);
        }

        let exp = Math.floor(((gamefreakSqrt(x) * x2) * z) / ((gamefreakSqrt(y) * y2))) + 1;

        if (log) {
            console.log("Exp: " + exp);
        }

        // console.log(exp);

        if (!gen7 && !wild) {
            exp =  Math.floor(exp * 1.5);
        }

        if (tradeExp) {
            exp = Math.floor(exp * 1.5);
        }

        // if (luckyEgg) {
        //     exp = Math.floor(exp * 1.5);
        // }

        if (affection) {
            exp = exp * 4915;
            exp = Math.round(exp / 4096)
        }

        if (evolutionDue) {
            exp = exp * 4915;
            exp = Math.round(exp / 4096)
        }

        if (rotoExp) {
            exp = exp * 150;
            exp = Math.floor(exp / 100);
        }

        return Math.floor(exp);
    } else {
        let exp = Math.floor(expYield * foeLevel / 7);

        if (log) {
            console.log("Exp: " + exp);
        }

        if (!gen7 && !wild) {
            exp =  Math.floor(exp * 1.5);
        }

        if (tradeExp) {
            exp = Math.floor(exp * 1.5);
        }

        if (affection) {
            exp = exp * 4915;
            exp = Math.round(exp / 4096)
        }

        if (evolutionDue) {
            exp = exp * 4915;
            exp = Math.round(exp / 4096)
        }

        return Math.floor(exp);
    }
}