import { ab2str, exportedKeyToPem, pemToKey, genKey } from "./ecc.js";
import { add_div_register_text } from "./registertext.js";

export async function registerConfirm() {
    const apiUrl = `/account/register`;
    const inputFieldSharedSecret = document.getElementById("sharedsecret");
    const inputFieldPublicKey = document.getElementById("publickey");
    let pubkey = null;
    if (!inputFieldPublicKey.value) {
        const { privateKey, publicKey } = await genKey();
        pubkey = exportedKeyToPem(publicKey, "public");
        let privkey = exportedKeyToPem(privateKey, "private");
        add_div_register_text(privkey);
    } else {
        pubkey = inputFieldPublicKey.value;
    }
    const postData = {
        sharedSecret: inputFieldSharedSecret.value,
        publicKey: pubkey
    };
    // clear input fields
    inputFieldSharedSecret.value='';
    inputFieldPublicKey.value='';

    const requestOptions = {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(postData)
    };
    const response = await fetch(apiUrl, requestOptions)
        .catch(error => {
        console.error('Error during POST request:', error);
    });

    if (response.ok) {
        console.log(response);
    } else {
        registerPopupText = document.getElementById("registerPopupText")
        registerPopupText.innerHTML = '';
        registerPopupText.innerText = "Registration failed. Please try again.";
        console.error('Error in server response.', response);
    }
}

export async function loginConfirm() {
    const apiUrl = `/account/login`;
    const inputFieldPrivateKey = document.getElementById("privatekey");
    const response = await fetch(apiUrl, { method: 'GET' });
    if (!response.ok) {
        throw new Error('Failed to fetch challenge');
    }
    const { challenge } = await response.json();
    console.log("Received challenge:", challenge);

    let privKey = await pemToKey(inputFieldPrivateKey.value, "private");

    const encoder = new TextEncoder();
    let encodedData = encoder.encode(challenge);

    // Sign the data using the private key.
    const signature = await crypto.subtle.sign(
        {
            name: "Ed25519",
        },
        privKey,
        encodedData,
    );
    let signatureString = ab2str(signature);
    let signatureBase64 = window.btoa(signatureString);

    const verifyApiUrl = `/account/verify-challenge`;
    const verifyResponse = await fetch(verifyApiUrl, {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({
            signature: signatureBase64
        })
    });

    if (!verifyResponse.ok) {
        throw new Error('Failed to verify the challenge');
    } else {
        const verifyResult = await verifyResponse.json();
        console.log("Verification result:", verifyResult);
        inputFieldPrivateKey.value = '';
        location.reload();
    }
}