{% set refresh_url = '/conversation?chat=' + (chat | urlencode) if is_group else '/conversation?handle=' + (handle | urlencode) %}
<div class="flex flex-col h-full overflow-hidden" hx-on::load="
  const m = document.getElementById('main');
  {% if is_group %}
  m.dataset.chat = '{{ chat }}';
  delete m.dataset.handle;
  {% else %}
  m.dataset.handle = '{{ handle }}';
  delete m.dataset.chat;
  {% endif %}
">
  {% set contact_url = '/contact?chat=' + (chat | urlencode) if is_group else '/contact?handle=' + (handle | urlencode) %}
  <header class="flex items-center gap-2 px-4 py-3 border-b border-app-border bg-app-surface flex-shrink-0">
    <button type="button" class="back-btn p-2 rounded-lg text-app-text-muted hover:bg-app-surface-hover md:hidden"
            aria-label="back to conversations"
            onclick="window.__showSidebar && window.__showSidebar()">
      <svg class="w-5 h-5" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round">
        <path d="M15 18l-6-6 6-6"/>
      </svg>
    </button>
    <a class="flex-1 min-w-0 cursor-pointer" href="#"
       hx-get="{{ contact_url }}"
       hx-target="#main"
       hx-swap="innerHTML">
      <h2 class="text-base font-semibold text-app-text truncate">{{ name }}</h2>
      <small class="text-sm text-app-text-muted truncate block">{{ subtitle }}</small>
    </a>
    <a class="header-info p-2 rounded-lg text-app-text-faint hover:bg-app-surface-hover hover:text-app-text-subtle"
       aria-label="contact info" title="contact info"
       href="#"
       hx-get="{{ contact_url }}"
       hx-target="#main"
       hx-swap="innerHTML">
      <svg class="w-5 h-5" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round">
        <circle cx="12" cy="12" r="10"/>
        <line x1="12" y1="8" x2="12" y2="8"/>
        <line x1="12" y1="12" x2="12" y2="16"/>
      </svg>
    </a>
  </header>

  <div class="messages" id="messages">
    {% if has_more %}
    <div class="load-older flex justify-center py-4"
         hx-get="{{ next_url }}"
         hx-trigger="intersect once"
         hx-swap="outerHTML">
      <svg aria-hidden="true" class="w-6 h-6 text-app-text-faint animate-spin fill-app-primary"
           viewBox="0 0 100 101" fill="none" xmlns="http://www.w3.org/2000/svg">
        <path d="M100 50.5908C100 78.2051 77.6142 100.591 50 100.591C22.3858 100.591 0 78.2051 0 50.5908C0 22.9766 22.3858 0.59082 50 0.59082C77.6142 0.59082 100 22.9766 100 50.5908ZM9.08144 50.5908C9.08144 73.1895 27.4013 91.5094 50 91.5094C72.5987 91.5094 90.9186 73.1895 90.9186 50.5908C90.9186 27.9921 72.5987 9.67226 50 9.67226C27.4013 9.67226 9.08144 27.9921 9.08144 50.5908Z" fill="currentColor"/>
        <path d="M93.9676 39.0409C96.393 38.4038 97.8624 35.9116 97.0079 33.5539C95.2932 28.8227 92.871 24.3692 89.8167 20.348C85.8452 15.1192 80.8826 10.7238 75.2124 7.41289C69.5422 4.10194 63.2754 1.94025 56.7698 1.05124C51.7666 0.367541 46.6976 0.446843 41.7345 1.27873C39.2613 1.69328 37.813 4.19778 38.4501 6.62326C39.0873 9.04874 41.5694 10.4717 44.0505 10.1071C47.8511 9.54855 51.7191 9.52689 55.5402 10.0491C60.8642 10.7766 65.9928 12.5457 70.6331 15.2552C75.2735 17.9648 79.3347 21.5619 82.5849 25.841C84.9175 28.9121 86.7997 32.2913 88.1811 35.8758C89.083 38.2158 91.5421 39.6781 93.9676 39.0409Z" fill="currentFill"/>
      </svg>
    </div>
    {% endif %}
    {% include "_messages.html" %}
  </div>

  <div id="send-banner" class="send-banner" hidden></div>

  <form class="composer flex items-end gap-2 px-4 py-3 border-t border-app-border bg-app-surface flex-shrink-0"
        hx-post="/send"
        hx-trigger="submit"
        hx-encoding="multipart/form-data"
        hx-swap="none"
        hx-on::before-request="window.__beforeSend(event)"
        hx-on::after-request="window.__handleSendResponse(event, '{{ refresh_url }}')">
    {% if is_group %}
    <input type="hidden" name="chat" value="{{ chat }}">
    {% else %}
    <input type="hidden" name="handle" value="{{ handle }}">
    {% endif %}
    <label id="attach-label" class="attach-btn p-2 rounded-lg text-app-text-muted hover:bg-app-surface-hover cursor-pointer"
           for="attach-input" title="attach a file">
      <svg class="w-5 h-5" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round">
        <path d="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"/>
      </svg>
    </label>
    <button type="button" id="emoji-btn" class="emoji-btn p-2 rounded-lg text-app-text-muted hover:bg-app-surface-hover"
            title="emoji" aria-label="insert emoji">
      <svg width="20" height="20" viewBox="0 0 24 24" fill="none"
           stroke="currentColor" stroke-width="1.8"
           stroke-linecap="round" stroke-linejoin="round">
        <circle cx="12" cy="12" r="10"/>
        <path d="M8 14s1.5 2 4 2 4-2 4-2"/>
        <line x1="9" y1="9" x2="9.01" y2="9"/>
        <line x1="15" y1="9" x2="15.01" y2="9"/>
      </svg>
    </button>
    <span id="attach-name" class="attach-name text-xs text-app-text-muted truncate max-w-24"></span>
    <input id="attach-input" type="file" name="file" accept="image/*,video/*" class="hidden"
           onchange="document.getElementById('attach-name').textContent = this.files[0] ? this.files[0].name : ''">
    <input type="text" name="body" id="composer-body"
           class="flex-1 block py-2.5 px-4 text-sm text-app-text bg-app-surface-alt border border-app-border rounded-full focus:ring-blue-500 focus:border-blue-500"
           placeholder="message {{ name }}…" autofocus>
    <button type="submit" class="send-btn p-2 rounded-full bg-app-primary text-app-on-primary hover:bg-app-primary-hover focus:ring-4 focus:ring-blue-300">
      <svg class="w-5 h-5" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round">
        <line x1="22" y1="2" x2="11" y2="13"/>
        <polygon points="22 2 15 22 11 13 2 9 22 2"/>
      </svg>
    </button>
    <div id="emoji-popover" hidden>
      <emoji-picker></emoji-picker>
    </div>
  </form>

  <div id="media-dialog" class="media-dialog fixed inset-0 z-50 flex items-center
       justify-center bg-black/80 hidden" role="dialog" aria-modal="true"
       aria-label="photo viewer">
    <img id="media-dialog-img" class="max-h-screen max-w-full rounded" alt="">
    <button type="button" class="media-prev absolute left-4 top-1/2 -translate-y-1/2
            p-2 rounded-full bg-black/50 text-white hover:bg-black/70"
            aria-label="previous photo">
      <svg class="w-6 h-6" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24"><path d="M15 18l-6-6 6-6"/></svg>
    </button>
    <button type="button" class="media-next absolute right-4 top-1/2 -translate-y-1/2
            p-2 rounded-full bg-black/50 text-white hover:bg-black/70"
            aria-label="next photo">
      <svg class="w-6 h-6" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24"><path d="M9 18l6-6-6-6"/></svg>
    </button>
    <button type="button" class="media-close absolute top-4 right-4 p-2 rounded-full
            bg-black/50 text-white hover:bg-black/70" aria-label="close">
      <svg class="w-6 h-6" fill="none" stroke="currentColor" stroke-width="2"
           viewBox="0 0 24 24">
        <line x1="18" y1="6" x2="6" y2="18"/>
        <line x1="6" y1="6" x2="18" y2="18"/>
      </svg>
    </button>
  </div>
</div>

<script>
  // Optimistic-send: clear the composer the instant the user hits enter and
  // drop a "ghost" bubble at the bottom of the thread so they see something
  // is moving. The ghost is replaced when the conversation refreshes after
  // the server confirms; on failure we restore the text so they can retry.
  window.__beforeSend = function(event) {
    const form = event.detail.elt;
    const body = form.querySelector('#composer-body');
    const attachName = document.getElementById('attach-name');
    const text = body ? body.value : '';
    const attachLabel = attachName ? attachName.textContent : '';
    form.__pending = { text: text, attach: attachLabel };

    if (body) body.value = '';
    if (attachName) attachName.textContent = '';

    const messages = document.getElementById('messages');
    if (!messages) return;
    const ghost = document.createElement('div');
    ghost.className = 'msg me ghost';
    ghost.id = '__ghost_msg';
    if (attachLabel) {
      const a = document.createElement('div');
      a.className = 'attach pending';
      a.innerHTML = '<svg class="w-4 h-4 inline mr-1" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24"><path d="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"/></svg>' + attachLabel;
      ghost.appendChild(a);
    }
    if (text) {
      const bubble = document.createElement('div');
      bubble.className = 'bubble';
      const t = document.createElement('div');
      t.className = 'text';
      t.textContent = text;
      bubble.appendChild(t);
      ghost.appendChild(bubble);
    }
    const ts = document.createElement('div');
    ts.className = 'ts';
    const tag = document.createElement('span');
    tag.className = 'delivery ghost-status bg-gray-100 text-gray-500 text-xs font-medium px-2 py-0.5 rounded-full';
    tag.textContent = 'sending…';
    ts.appendChild(tag);
    ghost.appendChild(ts);
    messages.appendChild(ghost);
    messages.scrollTop = messages.scrollHeight;
  };

  // Shared post-send handler: on success refresh the conversation, on
  // reported-failure keep the composer populated and show a banner so the
  // user sees what went wrong. refreshUrl is the full GET target for the
  // current conversation (1:1 or group).
  window.__handleSendResponse = function(event, refreshUrl) {
    const xhr = event.detail.xhr;
    const banner = document.getElementById('send-banner');
    const form = event.detail.elt;
    const ghost = document.getElementById('__ghost_msg');
    let payload = null;
    try { payload = JSON.parse(xhr.responseText); } catch (_) {}

    const restoreComposer = () => {
      if (!form || !form.__pending) return;
      const body = form.querySelector('#composer-body');
      if (body && !body.value) body.value = form.__pending.text || '';
      const an = document.getElementById('attach-name');
      if (an && !an.textContent) an.textContent = form.__pending.attach || '';
      form.__pending = null;
    };

    if (!event.detail.successful) {
      if (banner) {
        banner.textContent = 'send failed: ' + (payload && payload.detail || xhr.statusText || 'server error');
        banner.classList.remove('info');
        banner.hidden = false;
      }
      if (ghost) ghost.remove();
      restoreComposer();
      return;
    }
    const status = payload && payload.status;
    const hint = payload && payload.hint;
    const fellBack = payload && payload.fell_back_to_sms;
    if (status === 'failed' && banner) {
      banner.textContent = 'Not delivered: ' + (hint || 'unknown error');
      banner.classList.remove('info');
      banner.hidden = false;
      if (ghost) ghost.remove();
      restoreComposer();
      return;
    } else if (fellBack && banner) {
      banner.textContent = 'Sent via SMS — iMessage unavailable for this recipient.';
      banner.classList.add('info');
      banner.hidden = false;
    } else if (banner) {
      banner.classList.remove('info');
      banner.hidden = true;
    }
    if (ghost) {
      const tag = ghost.querySelector('.ghost-status');
      if (tag) tag.textContent = 'sent to server';
    }
    const fileEl = document.getElementById('attach-input');
    if (fileEl) fileEl.value = '';
    if (form) form.__pending = null;
    htmx.ajax('GET', refreshUrl, '#main');
  };

  // Auto-scroll messages to bottom on render + wire up the emoji popover.
  (function() {
    const m = document.getElementById('messages');

    // Robust scroll-to-bottom: run immediately, then again after a short
    // delay (images/media may still be loading, increasing scrollHeight).
    // A ResizeObserver keeps us pinned at the bottom while content loads
    // (only if we were already near the bottom — avoids hijacking scroll
    // when the user has scrolled up to read history).
    function scrollToBottom() {
      if (m) m.scrollTop = m.scrollHeight;
    }
    scrollToBottom();
    setTimeout(scrollToBottom, 150);
    setTimeout(scrollToBottom, 500);

    if (m && typeof ResizeObserver !== 'undefined') {
      let pinned = true;
      m.addEventListener('scroll', () => {
        // "Near bottom" = within 80px of the end.
        pinned = (m.scrollHeight - m.scrollTop - m.clientHeight) < 80;
      });
      new ResizeObserver(() => {
        if (pinned) scrollToBottom();
      }).observe(m);
    }

    // Scroll-anchor preservation around load-older swaps. When the trigger
    // is replaced with a page of older bubbles + a fresh trigger, content
    // grows above the user's view; we capture distance-from-bottom before
    // the swap and restore it after so the user stays anchored on the
    // message they were reading instead of being kicked to the new top.
    if (m) {
      let anchor = null;
      m.addEventListener('htmx:beforeSwap', (e) => {
        const t = e.detail && e.detail.target;
        if (!t || !t.classList || !t.classList.contains('load-older')) return;
        anchor = m.scrollHeight - m.scrollTop;
      });
      m.addEventListener('htmx:afterSwap', () => {
        if (anchor === null) return;
        m.scrollTop = m.scrollHeight - anchor;
        anchor = null;
      });
    }

    const mainEl = document.getElementById('main');
    {% if is_group %}
    mainEl.dataset.chat = '{{ chat }}';
    delete mainEl.dataset.handle;
    {% else %}
    mainEl.dataset.handle = '{{ handle }}';
    delete mainEl.dataset.chat;
    {% endif %}

    const btn = document.getElementById('emoji-btn');
    const pop = document.getElementById('emoji-popover');
    const body = document.getElementById('composer-body');
    if (!btn || !pop || !body) return;

    function insertAtCursor(s) {
      const start = body.selectionStart ?? body.value.length;
      const end = body.selectionEnd ?? body.value.length;
      body.value = body.value.slice(0, start) + s + body.value.slice(end);
      const pos = start + s.length;
      body.setSelectionRange(pos, pos);
      body.focus();
    }

    btn.addEventListener('click', (e) => {
      e.stopPropagation();
      pop.hidden = !pop.hidden;
    });

    const picker = pop.querySelector('emoji-picker');
    picker.addEventListener('emoji-click', (e) => {
      insertAtCursor(e.detail.unicode);
      pop.hidden = true;
    });

    document.addEventListener('click', (e) => {
      if (pop.hidden) return;
      if (pop.contains(e.target) || btn.contains(e.target)) return;
      pop.hidden = true;
    });
  })();

  // Inline media viewer: clicking a photo opens a fullscreen overlay div with
  // prev/next navigation across all photos in the current thread, instead of
  // opening a new browser tab. Videos and audio are unaffected (their native
  // controls play in place). Re-runs on every htmx swap; the previous
  // dialog/handlers are discarded with the old DOM.
  (function() {
    const dialog = document.getElementById('media-dialog');
    const dialogImg = document.getElementById('media-dialog-img');
    const messagesEl = document.getElementById('messages');
    if (!dialog || !dialogImg || !messagesEl) return;

    let mediaList = [];
    let currentIndex = -1;

    function refresh() {
      mediaList = Array.from(messagesEl.querySelectorAll('a.media'));
    }
    function updateNav() {
      const prev = dialog.querySelector('.media-prev');
      const next = dialog.querySelector('.media-next');
      if (prev) prev.style.visibility = currentIndex > 0 ? 'visible' : 'hidden';
      if (next) next.style.visibility = currentIndex < mediaList.length - 1 ? 'visible' : 'hidden';
    }
    function openAt(index) {
      if (index < 0 || index >= mediaList.length) return;
      currentIndex = index;
      const link = mediaList[index];
      dialogImg.src = link.getAttribute('href');
      const inner = link.querySelector('img');
      dialogImg.alt = inner ? (inner.alt || '') : '';
      updateNav();
      dialog.classList.remove('hidden');
    }

    messagesEl.addEventListener('click', (e) => {
      const link = e.target.closest('a.media');
      if (!link || !messagesEl.contains(link)) return;
      e.preventDefault();
      refresh();
      const idx = mediaList.indexOf(link);
      if (idx >= 0) openAt(idx);
    });

    const prevBtn = dialog.querySelector('.media-prev');
    const nextBtn = dialog.querySelector('.media-next');
    const closeBtn = dialog.querySelector('.media-close');
    if (prevBtn) prevBtn.addEventListener('click', (e) => { e.stopPropagation(); openAt(currentIndex - 1); });
    if (nextBtn) nextBtn.addEventListener('click', (e) => { e.stopPropagation(); openAt(currentIndex + 1); });
    if (closeBtn) closeBtn.addEventListener('click', () => dialog.classList.add('hidden'));
    dialog.addEventListener('click', (e) => {
      if (e.target === dialog) dialog.classList.add('hidden');
    });

    document.addEventListener('keydown', (e) => {
      if (dialog.classList.contains('hidden')) return;
      if (e.key === 'ArrowLeft') { e.preventDefault(); openAt(currentIndex - 1); }
      else if (e.key === 'ArrowRight') { e.preventDefault(); openAt(currentIndex + 1); }
    });
  })();
</script>