import { renderHeader } from '../components/header.js';
import { formatSol, getBalanceSol, transferSol, createSolanaWalletFromPrivateBase58 } from '../services/solana-wallet-service.js';
import { state } from '../state.js';

export const pageMeta = { id: 'devnet-topup-view', title: 'Пополнение DEVNET', showAppChrome: false };

const SENDER_PRIVATE_32_BASE58 = '6xqAuKYvA8qrCdAkcw7Y8aMgvBnYk8JLxWLma5BzbAvu';
const TRANSFER_AMOUNT_SOL = 0.01;

function readWalletFromUrl() {
  try {
    const url = new URL(window.location.href);
    return String(url.searchParams.get('wallet') || '').trim();
  } catch {
    return '';
  }
}

export function render({ navigate }) {
  const screen = document.createElement('section');
  screen.className = 'stack';

  const targetWallet = readWalletFromUrl();

  const senderBox = document.createElement('div');
  senderBox.className = 'card stack';
  senderBox.innerHTML = `
    <strong>Тестовый DEVNET-кошелёк</strong>
    <p class="meta-muted" id="devnet-topup-sender-address">Адрес: ...</p>
    <p class="meta-muted" id="devnet-topup-sender-balance">Баланс: ...</p>
  `;

  const targetBox = document.createElement('div');
  targetBox.className = 'card stack';
  targetBox.innerHTML = `
    <strong>Кошелёк получателя</strong>
    <p class="meta-muted" style="word-break:break-all;">${targetWallet || 'Не передан параметр wallet'}</p>
    <p class="meta-muted">Сумма перевода: ${TRANSFER_AMOUNT_SOL} SOL</p>
  `;

  const status = document.createElement('p');
  status.className = 'meta-muted';
  status.textContent = 'Готово к пополнению.';

  const fillBtn = document.createElement('button');
  fillBtn.className = 'primary-btn';
  fillBtn.type = 'button';
  fillBtn.textContent = `Пополнить на ${TRANSFER_AMOUNT_SOL} SOL`;

  const backBtn = document.createElement('button');
  backBtn.className = 'secondary-btn';
  backBtn.type = 'button';
  backBtn.textContent = 'Назад';
  backBtn.addEventListener('click', () => navigate('registration-payment-view'));

  const actions = document.createElement('div');
  actions.className = 'auth-footer-actions';
  actions.append(fillBtn, backBtn);

  let senderAddress = '';
  let senderKeypair = null;

  const updateSenderBalance = async () => {
    if (!senderAddress) return;
    const endpoint = state.entrySettings.solanaServer;
    const balance = await getBalanceSol({ endpoint, address: senderAddress });
    const senderBalanceEl = senderBox.querySelector('#devnet-topup-sender-balance');
    if (senderBalanceEl) senderBalanceEl.textContent = `Баланс: ${formatSol(balance.sol, 6)} SOL`;
  };

  fillBtn.addEventListener('click', async () => {
    if (!targetWallet) {
      status.textContent = 'Ошибка: в URL не передан параметр wallet.';
      return;
    }
    if (!senderKeypair) {
      status.textContent = 'Ошибка: кошелёк отправителя не инициализирован.';
      return;
    }

    fillBtn.disabled = true;
    status.textContent = 'Отправляем перевод...';

    try {
      const endpoint = state.entrySettings.solanaServer;
      const tx = await transferSol({
        endpoint,
        fromKeypair: senderKeypair,
        toAddress: targetWallet,
        amountSol: TRANSFER_AMOUNT_SOL,
      });
      await updateSenderBalance();
      status.textContent = `Готово. Signature: ${tx.signature}`;
    } catch (error) {
      status.textContent = `Ошибка перевода: ${error?.message || 'unknown'}`;
    } finally {
      fillBtn.disabled = false;
    }
  });

  (async () => {
    try {
      const sender = await createSolanaWalletFromPrivateBase58(SENDER_PRIVATE_32_BASE58);
      senderAddress = sender.address;
      senderKeypair = sender.keypair;
      const senderAddressEl = senderBox.querySelector('#devnet-topup-sender-address');
      if (senderAddressEl) senderAddressEl.textContent = `Адрес: ${senderAddress}`;
      await updateSenderBalance();
      if (!targetWallet) {
        fillBtn.disabled = true;
        status.textContent = 'Передайте адрес получателя в параметре wallet.';
      }
    } catch (error) {
      fillBtn.disabled = true;
      status.textContent = `Ошибка инициализации отправителя: ${error?.message || 'unknown'}`;
    }
  })();

  screen.append(
    renderHeader({
      title: 'DEVNET пополнение',
      leftAction: { label: '←', onClick: () => navigate('registration-payment-view') },
    }),
    senderBox,
    targetBox,
    status,
    actions,
  );

  return screen;
}