const gensaltBtn = document.getElementById('gensaltBtn');
const algorithm = document.getElementById('algorithm');
const password = document.getElementById('password');
const salt = document.getElementById('salt');
const hashBtn = document.getElementById('hashBtn');
const result = document.getElementById('result');
const clearBtn = document.getElementById('clearBtn');

const MIN_PASS_LEN = 16;
const MIN_SALT_LEN = 8;
const MAX_SALT_LEN = 16;

gensaltBtn.addEventListener('click', async () => {
    const len = MAX_SALT_LEN; // can be adjusted or user-defined
    const res = await fetch('/gensalt?length=' + len);
    if (!res.ok) { alert('Could not generate salt'); return; }
    const data = await res.json();
    salt.value = data.salt;
});

hashBtn.addEventListener('click', async () => {
    const pass = password.value || '';
    const s = salt.value || '';
    const alg = algorithm.value;

    if (pass.length < MIN_PASS_LEN) { 
        alert('Password must be at least ' + MIN_PASS_LEN + ' characters');
        return; 
    }

    if (s.length < MIN_SALT_LEN || s.length > MAX_SALT_LEN) { 
        alert('Salt must be between ' + MIN_SALT_LEN + ' and ' + MAX_SALT_LEN + ' characters');
        return; 
    }

    const payload = { password: pass, salt: s, algorithm: alg };
    const res = await fetch('/hash', {
        method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(payload)
    });

    if (!res.ok) {
        const txt = await res.text();
        alert('Error: ' + txt);
        return;
    }

    const data = await res.json();
    result.value = data.hash;
});

clearBtn.addEventListener('click', () => {
    password.value = '';
    salt.value = '';
    result.value = '';
});