/* ============================================================
   BAN YARO — Freunde-Seite
   ============================================================ */

window.Page_friends = (() => {

  let _container = null;
  let _searchTimer = null;

  // ----------------------------------------------------------
  function init(container) {
    _container = container;
    render();
  }

  // ----------------------------------------------------------
  async function render() {
    _container.innerHTML = `
      <div style="padding:var(--space-4)">
        <h2 style="font-size:var(--text-xl);font-weight:var(--weight-bold);margin-bottom:var(--space-4)">
          Freunde
        </h2>

        <!-- Suche -->
        <div class="friends-search-row">
          <input id="fr-search" class="form-input" type="search"
                 placeholder="Namen suchen…" autocomplete="off" style="flex:1">
        </div>
        <div id="fr-search-results"></div>

        <!-- Incoming requests -->
        <div id="fr-incoming"></div>

        <!-- Outgoing -->
        <div id="fr-outgoing"></div>

        <!-- Friends list -->
        <div id="fr-list"></div>
      </div>
    `;

    document.getElementById('fr-search').addEventListener('input', e => {
      clearTimeout(_searchTimer);
      _searchTimer = setTimeout(() => _doSearch(e.target.value.trim()), 400);
    });

    await _loadFriends();
  }

  // ----------------------------------------------------------
  async function _loadFriends() {
    try {
      const data = await API.friends.list();
      _renderIncoming(data.incoming);
      _renderOutgoing(data.outgoing);
      _renderFriends(data.friends);
      _updateBadge(data.incoming.length);
    } catch (e) {
      if (e.status === 401) {
        document.getElementById('fr-list').innerHTML =
          `<div class="empty-state"><p>Bitte melde dich an, um Freunde zu verwalten.</p></div>`;
      }
    }
  }

  // ----------------------------------------------------------
  function _updateBadge(count) {
    const el = document.getElementById('friends-badge');
    if (!el) return;
    el.textContent = count;
    el.style.display = count > 0 ? '' : 'none';
  }

  // ----------------------------------------------------------
  function _renderIncoming(list) {
    const el = document.getElementById('fr-incoming');
    if (!list.length) { el.innerHTML = ''; return; }
    el.innerHTML = `
      <h3 style="font-size:var(--text-sm);font-weight:var(--weight-semibold);
                 color:var(--c-text-secondary);margin-bottom:var(--space-2)">
        Anfragen (${list.length})
      </h3>
      ${list.map(r => `
        <div class="friend-request-card">
          <div class="friend-avatar">${_initial(r.requester_name)}</div>
          <div style="flex:1">
            <div style="font-weight:var(--weight-semibold)">${_esc(r.requester_name)}</div>
            <div style="font-size:var(--text-xs);color:var(--c-text-muted)">möchte mit dir befreundet sein</div>
          </div>
          <div class="friend-item-actions">
            <button class="btn btn-primary btn-sm"
                    onclick="Page_friends._accept(${r.id})">
              <svg class="ph-icon"><use href="/icons/phosphor.svg#check"></use></svg>
            </button>
            <button class="btn btn-ghost btn-sm"
                    onclick="Page_friends._decline(${r.id})">
              <svg class="ph-icon"><use href="/icons/phosphor.svg#x"></use></svg>
            </button>
          </div>
        </div>
      `).join('')}
    `;
  }

  // ----------------------------------------------------------
  function _renderOutgoing(list) {
    const el = document.getElementById('fr-outgoing');
    if (!list.length) { el.innerHTML = ''; return; }
    el.innerHTML = `
      <h3 style="font-size:var(--text-sm);font-weight:var(--weight-semibold);
                 color:var(--c-text-secondary);margin:var(--space-4) 0 var(--space-2)">
        Gesendete Anfragen
      </h3>
      ${list.map(r => `
        <div class="friend-item">
          <div class="friend-avatar">${_initial(r.addressee_name)}</div>
          <div class="friend-item-name">${_esc(r.addressee_name)}</div>
          <span style="font-size:var(--text-xs);color:var(--c-text-muted)">ausstehend</span>
          <button class="btn btn-ghost btn-sm"
                  onclick="Page_friends._cancel(${r.id})"
                  title="Anfrage zurückziehen">
            <svg class="ph-icon"><use href="/icons/phosphor.svg#x"></use></svg>
          </button>
        </div>
      `).join('')}
    `;
  }

  // ----------------------------------------------------------
  function _renderFriends(list) {
    const el = document.getElementById('fr-list');
    if (!list.length) {
      el.innerHTML = `
        <div class="empty-state" style="margin-top:var(--space-6)">
          <svg class="ph-icon" style="font-size:3rem;opacity:0.3"><use href="/icons/phosphor.svg#users"></use></svg>
          <p style="margin-top:var(--space-3);color:var(--c-text-muted)">
            Noch keine Freunde. Suche oben nach Nutzern!
          </p>
        </div>
      `;
      return;
    }
    el.innerHTML = `
      <h3 style="font-size:var(--text-sm);font-weight:var(--weight-semibold);
                 color:var(--c-text-secondary);margin:var(--space-4) 0 var(--space-2)">
        Freunde (${list.length})
      </h3>
      ${list.map(f => `
        <div class="friend-item">
          <div class="friend-avatar">${_initial(f.friend_name)}</div>
          <div class="friend-item-name">${_esc(f.friend_name)}</div>
          <div class="friend-item-actions">
            <button class="btn btn-ghost btn-sm"
                    onclick="Page_friends._openChat(${f.friend_id})"
                    title="Nachricht senden">
              <svg class="ph-icon"><use href="/icons/phosphor.svg#chat-circle-dots"></use></svg>
            </button>
            <button class="btn btn-ghost btn-sm"
                    onclick="Page_friends._removeFriend(${f.friend_id}, '${_esc(f.friend_name)}')"
                    title="Freund entfernen">
              <svg class="ph-icon"><use href="/icons/phosphor.svg#user-minus"></use></svg>
            </button>
          </div>
        </div>
      `).join('')}
    `;
  }

  // ----------------------------------------------------------
  async function _doSearch(q) {
    const el = document.getElementById('fr-search-results');
    if (q.length < 2) { el.innerHTML = ''; return; }
    try {
      const results = await API.friends.search(q);
      if (!results.length) {
        el.innerHTML = `<div class="friends-search-results">
          <div style="padding:var(--space-3) var(--space-4);color:var(--c-text-muted);font-size:var(--text-sm)">
            Keine Nutzer gefunden.
          </div>
        </div>`;
        return;
      }
      el.innerHTML = `
        <div class="friends-search-results">
          ${results.map(u => `
            <div class="friend-result-item">
              <div class="friend-avatar">${_initial(u.name)}</div>
              <div style="flex:1;font-size:var(--text-sm)">${_esc(u.name)}</div>
              <button class="btn btn-primary btn-sm"
                      onclick="Page_friends._sendRequest(${u.id}, this)">
                <svg class="ph-icon"><use href="/icons/phosphor.svg#user-plus"></use></svg>
                Anfrage
              </button>
            </div>
          `).join('')}
        </div>
      `;
    } catch (e) {
      el.innerHTML = '';
    }
  }

  // ----------------------------------------------------------
  async function _sendRequest(userId, btn) {
    btn.disabled = true;
    try {
      await API.friends.sendRequest(userId);
      UI.toast('Freundschaftsanfrage gesendet!', 'success');
      document.getElementById('fr-search').value = '';
      document.getElementById('fr-search-results').innerHTML = '';
      await _loadFriends();
    } catch (e) {
      UI.toast(e.message, 'danger');
      btn.disabled = false;
    }
  }

  async function _accept(id) {
    try {
      await API.friends.accept(id);
      UI.toast('Freundschaft angenommen!', 'success');
      await _loadFriends();
    } catch (e) {
      UI.toast(e.message, 'danger');
    }
  }

  async function _decline(id) {
    try {
      await API.friends.decline(id);
      await _loadFriends();
    } catch (e) {
      UI.toast(e.message, 'danger');
    }
  }

  async function _cancel(id) {
    try {
      await API.friends.decline(id);
      await _loadFriends();
    } catch (e) {
      UI.toast(e.message, 'danger');
    }
  }

  async function _removeFriend(userId, name) {
    if (!confirm(`${name} als Freund entfernen?`)) return;
    try {
      await API.friends.remove(userId);
      UI.toast('Freund entfernt.', 'info');
      await _loadFriends();
    } catch (e) {
      UI.toast(e.message, 'danger');
    }
  }

  async function _openChat(userId) {
    try {
      const { conversation_id } = await API.chat.start(userId);
      App.navigate('chat', true, { conversation_id });
    } catch (e) {
      UI.toast(e.message, 'danger');
    }
  }

  // ----------------------------------------------------------
  function _initial(name) {
    return (name || '?')[0].toUpperCase();
  }

  function _esc(s) {
    if (!s) return '';
    return String(s).replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
  }

  // ----------------------------------------------------------
  return {
    init,
    _sendRequest, _accept, _decline, _cancel, _removeFriend, _openChat,
  };

})();