let special = "!@$&*()_+";
let digits = "0123456789";
let letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

interface PasswordGeneratorConfiguration {
    length?: number;
    numberOfDigits?: number;
    numberOfSpecialCharacters?: number;
}

export function generatePassword({ length = 16, numberOfDigits = 2, numberOfSpecialCharacters = 4 }: PasswordGeneratorConfiguration): string {
    let password = "";

    for (let i = 0; i < length - numberOfDigits - numberOfSpecialCharacters; i++) {
        const randomIndex = Math.floor(Math.random() * length);
        const randomLetter = Math.floor(Math.random() * letters.length);
        password = password.slice(0, randomIndex) + letters[randomLetter] + password.slice(randomIndex);
    }

    for (let i = 0; i < numberOfDigits; i++) {
        const randomIndex = Math.floor(Math.random() * length);
        const randomDigit = Math.floor(Math.random() * 10);
        password = password.slice(0, randomIndex) + digits[randomDigit] + password.slice(randomIndex);
    }

    for (let i = 0; i < numberOfSpecialCharacters; i++) {
        const randomIndex = Math.floor(Math.random() * length);
        const randomSpecial = Math.floor(Math.random() * special.length);
        password = password.slice(0, randomIndex) + special[randomSpecial] + password.slice(randomIndex);
    }

    return password;
}