import { renderHeader } from '../components/header.js';
import { authService } from '../state.js';
import { renderUserAvatar } from '../components/avatar-image.js';
import { loadProfileSnapshot } from '../services/user-profile-params.js';
import { makeProfileRoute } from '../services/shine-routes.js';

export const pageMeta = { id: 'contact-search-view', title: 'Поиск контактов' };
const searchAvatarSnapshotCache = new Map();
const searchAvatarPendingByLogin = new Map();

async function loadSearchAvatarSnapshot(login) {
  const cleanLogin = String(login || '').trim();
  if (!cleanLogin) return null;
  const key = cleanLogin.toLowerCase();
  if (searchAvatarSnapshotCache.has(key)) return searchAvatarSnapshotCache.get(key);
  if (searchAvatarPendingByLogin.has(key)) return searchAvatarPendingByLogin.get(key);
  const pending = loadProfileSnapshot(cleanLogin)
    .then((snapshot) => {
      searchAvatarSnapshotCache.set(key, snapshot || null);
      searchAvatarPendingByLogin.delete(key);
      return snapshot || null;
    })
    .catch(() => {
      searchAvatarSnapshotCache.set(key, null);
      searchAvatarPendingByLogin.delete(key);
      return null;
    });
  searchAvatarPendingByLogin.set(key, pending);
  return pending;
}

function createSearchAvatar(login) {
  const cleanLogin = String(login || '').trim();
  const title = cleanLogin ? `Профиль ${cleanLogin}` : '';
  const avatarEl = renderUserAvatar({
    login: cleanLogin || 'unknown',
    size: 'small',
    className: 'avatar',
    title,
  });
  if (!cleanLogin) return avatarEl;
  void loadSearchAvatarSnapshot(cleanLogin).then((snapshot) => {
    if (!avatarEl.isConnected) return;
    const upgraded = renderUserAvatar({
      login: cleanLogin,
      avatar: snapshot?.avatar?.txId
        ? {
          ar: String(snapshot.avatar.txId || '').trim(),
          sha256Hex: String(snapshot?.avatar?.sha256Hex || '').trim().toLowerCase(),
        }
        : null,
      size: 'small',
      className: 'avatar',
      title,
    });
    avatarEl.replaceWith(upgraded);
  });
  return avatarEl;
}

export function render({ navigate }) {
  const screen = document.createElement('section');
  screen.className = 'stack dm-screen dm-search-screen';
  let searchTimer = 0;
  let searchSeq = 0;

  const input = document.createElement('input');
  input.className = 'input dm-input contact-search-input';
  input.type = 'text';
  input.name = 'contact';
  input.placeholder = 'Введите начало логина';
  input.autocomplete = 'off';
  input.maxLength = 80;

  const resultsCard = document.createElement('section');
  resultsCard.className = 'card stack contact-search-results-card';
  resultsCard.hidden = true;

  const status = document.createElement('p');
  status.className = 'contact-search-results-title';

  const resultsList = document.createElement('div');
  resultsList.className = 'stack dm-list';

  const renderResults = (matches, query) => {
    resultsList.innerHTML = '';

    if (!query.trim()) {
      status.textContent = '';
      resultsCard.hidden = true;
      return;
    }

    resultsCard.hidden = false;

    if (!matches.length) {
      status.textContent = 'Найдено пользователей: 0';
      return;
    }

    status.textContent = `Найдено пользователей: ${matches.length}`;

    matches.forEach((login) => {
      const row = document.createElement('article');
      row.className = 'list-item dm-dialog-card';
      const avatarEl = createSearchAvatar(login);
      row.innerHTML = `
        <div class="contact-search-result-main">
          <strong class="dm-row-title">${login}</strong>
        </div>
        <span class="dm-chevron" aria-hidden="true">›</span>
      `;
      row.prepend(avatarEl);
      row.addEventListener('click', () => {
        navigate(makeProfileRoute(login));
      });
      resultsList.append(row);
    });
  };

  const runSearch = async () => {
    const query = input.value.trim();
    const seq = ++searchSeq;
    if (!query) {
      renderResults([], '');
      return;
    }

    try {
      const logins = await authService.searchUsers(query);
      if (seq !== searchSeq) return;
      renderResults((logins || []).slice(0, 5), query);
    } catch (e) {
      if (seq !== searchSeq) return;
      status.textContent = `Ошибка поиска: ${e.message || 'unknown'}`;
      resultsCard.hidden = false;
      resultsList.innerHTML = '';
    }
  };

  const scheduleSearch = () => {
    if (searchTimer) window.clearTimeout(searchTimer);
    searchTimer = window.setTimeout(() => {
      searchTimer = 0;
      void runSearch();
    }, 2000);
  };

  const searchButton = document.createElement('button');
  searchButton.className = 'primary-btn dm-send-btn';
  searchButton.type = 'button';
  searchButton.textContent = 'Поиск';
  searchButton.addEventListener('click', async () => {
    if (searchTimer) {
      window.clearTimeout(searchTimer);
      searchTimer = 0;
    }
    await runSearch();
  });

  input.addEventListener('input', () => {
    scheduleSearch();
  });

  const controls = document.createElement('div');
  controls.className = 'contact-search-actions';
  controls.append(searchButton);

  const formCard = document.createElement('section');
  formCard.className = 'card stack contact-search-form-card';
  formCard.append(input, controls);

  resultsCard.append(status, resultsList);

  screen.append(
    renderHeader({
      title: 'Поиск контактов',
      leftAction: { label: '←', onClick: () => navigate('messages-list') },
    }),
    formCard,
    resultsCard,
  );

  screen.cleanup = () => {
    if (searchTimer) window.clearTimeout(searchTimer);
  };

  return screen;
}