// ui.js — notifications, context menus, markdown, shared DOM helpers

// ── Notifications ─────────────────────────────────────────────────────────

export function showNotification({ type = 'info', message, action, duration = 5000 }) {
  const container = document.getElementById('notifications');
  if (!container) return;

  const el = document.createElement('div');
  el.className = `notification ${type}`;

  const text = document.createElement('span');
  text.style.flex = '1';
  text.textContent = message;
  el.appendChild(text);

  if (action) {
    const btn = document.createElement('button');
    btn.textContent = action.label;
    btn.style.cssText = 'margin-left:10px;color:var(--yellow);font-size:12px;font-weight:600;white-space:nowrap;';
    btn.addEventListener('click', () => { action.onClick?.(); el.remove(); });
    el.appendChild(btn);
  }

  const close = document.createElement('button');
  close.className = 'notif-close';
  close.textContent = '×';
  close.addEventListener('click', () => el.remove());
  el.appendChild(close);

  container.appendChild(el);
  if (duration > 0) setTimeout(() => el.remove(), duration);
  return el;
}

// ── Context menu ──────────────────────────────────────────────────────────

let activeMenu = null;
let menuDocHandler = null;

export function showContextMenu(x, y, items) {
  closeContextMenu();

  const menu = document.getElementById('session-context-menu');
  menu.innerHTML = '';

  for (const item of items) {
    if (item.separator) {
      const sep = document.createElement('div');
      sep.style.cssText = 'height:1px;background:var(--border);margin:3px 0;';
      menu.appendChild(sep);
      continue;
    }
    const el = document.createElement('div');
    el.className = 'context-item' + (item.danger ? ' danger' : '') + (item.warning ? ' warning' : '');
    if (item.icon) {
      const ic = document.createElement('span');
      ic.textContent = item.icon;
      ic.style.fontSize = '14px';
      el.appendChild(ic);
    }
    const label = document.createElement('span');
    label.textContent = item.label;
    el.appendChild(label);
    el.addEventListener('click', (e) => { e.stopPropagation(); closeContextMenu(); item.onClick?.(); });
    menu.appendChild(el);
  }

  // Position
  menu.classList.remove('hidden');
  const rect = menu.getBoundingClientRect();
  const vw = window.innerWidth, vh = window.innerHeight;
  let left = x, top = y;
  if (left + rect.width > vw - 8)  left = vw - rect.width - 8;
  if (top  + rect.height > vh - 8) top  = y - rect.height;
  if (top < 8) top = 8;
  menu.style.left = `${left}px`;
  menu.style.top  = `${top}px`;

  activeMenu = menu;
  queueMicrotask(() => {
    menuDocHandler = (e) => {
      if (!menu.contains(e.target)) closeContextMenu();
    };
    document.addEventListener('click', menuDocHandler);
    document.addEventListener('keydown', (e) => { if (e.key === 'Escape') closeContextMenu(); }, { once: true });
  });
}

export function showUserMenu(x, y, items) {
  const menu = document.getElementById('user-context-menu');
  menu.innerHTML = '';
  for (const item of items) {
    const el = document.createElement('div');
    el.className = 'context-item' + (item.danger ? ' danger' : '');
    el.textContent = item.label;
    el.addEventListener('click', () => { menu.classList.add('hidden'); item.onClick?.(); });
    menu.appendChild(el);
  }
  menu.classList.remove('hidden');
  const vw = window.innerWidth, vh = window.innerHeight;
  const rect = menu.getBoundingClientRect();
  let left = x, top = y;
  if (left + rect.width > vw - 8) left = vw - rect.width - 8;
  if (top + rect.height > vh - 8) top = y - rect.height;
  menu.style.left = `${left}px`;
  menu.style.top  = `${top}px`;
  setTimeout(() => {
    document.addEventListener('click', (e) => {
      if (!menu.contains(e.target)) menu.classList.add('hidden');
    }, { once: true });
  }, 0);
}

export function closeContextMenu() {
  activeMenu?.classList.add('hidden');
  activeMenu = null;
  if (menuDocHandler) { document.removeEventListener('click', menuDocHandler); menuDocHandler = null; }
}

// ── Markdown rendering ────────────────────────────────────────────────────

function buildMarkdownOptions() {
  const renderer = new marked.Renderer();

  renderer.code = (code, lang) => {
    const escapedCode = escHtml(code);
    const displayLang = lang || 'code';
    if (lang === 'svg') {
      // SVG inline render
      return `<div class="svg-render-block" data-svg="${escAttr(code)}">
        <img src="data:image/svg+xml,${encodeURIComponent(code)}" style="max-width:100%;cursor:pointer;" alt="SVG">
      </div>`;
    }
    return `<div class="code-block">
      <div class="code-header">
        <span class="code-lang">${escHtml(displayLang)}</span>
        <button class="code-copy-btn" data-code="${escAttr(code)}">Copy</button>
      </div>
      <pre><code class="language-${escHtml(displayLang)}">${escapedCode}</code></pre>
    </div>`;
  };

  renderer.link = (href, title, text) => {
    const safeHref = escHtml(href || '');
    return `<a href="${safeHref}" target="_blank" rel="noopener noreferrer" title="${escHtml(title || '')}">${text}</a>`;
  };

  return { renderer, breaks: true, gfm: true };
}

export function renderMarkdown(text) {
  if (!text) return '';
  try {
    marked.setOptions(buildMarkdownOptions());
    const raw = marked.parse(text);
    const clean = DOMPurify.sanitize(raw, {
      ALLOWED_TAGS: [
        'p','br','strong','em','del','u','s','h1','h2','h3','h4','h5','h6',
        'ul','ol','li','blockquote','hr','table','thead','tbody','tr','th','td',
        'pre','code','a','img','span','div','details','summary',
      ],
      ALLOWED_ATTR: ['href','src','alt','title','class','data-code','data-svg','data-color',
        'target','rel','style','open','align'],
      ALLOW_DATA_ATTR: true,
    });
    return clean;
  } catch (e) {
    return escHtml(text);
  }
}

export function attachCodeCopyListeners(container) {
  container.querySelectorAll('.code-copy-btn').forEach(btn => {
    btn.addEventListener('click', async (e) => {
      e.stopPropagation();
      const code = btn.getAttribute('data-code') || '';
      try {
        await navigator.clipboard.writeText(code);
        btn.textContent = 'Copied!';
        setTimeout(() => btn.textContent = 'Copy', 1400);
      } catch {
        btn.textContent = 'Error';
        setTimeout(() => btn.textContent = 'Copy', 1400);
      }
    });
  });
}

export function attachSvgPanelListeners(container) {
  container.querySelectorAll('.svg-render-block img').forEach(img => {
    img.addEventListener('click', () => {
      const svgCode = img.closest('.svg-render-block')?.getAttribute('data-svg') || '';
      openSvgPanel(svgCode);
    });
  });
}

function openSvgPanel(svgCode) {
  let panel = document.getElementById('svg-panel');
  if (!panel) {
    panel = document.createElement('div');
    panel.id = 'svg-panel';
    panel.innerHTML = `
      <div id="svg-panel-header">
        <span style="font-size:13px;font-weight:600;">SVG Preview</span>
        <div style="display:flex;gap:6px">
          <button id="svg-toggle-btn" style="font-size:11px;padding:3px 8px;border-radius:4px;border:1px solid var(--border-bright);background:var(--bg-hover)">XML</button>
          <button id="svg-close-btn" style="color:var(--text-muted);font-size:18px;padding:0 4px;">×</button>
        </div>
      </div>
      <div id="svg-panel-content"></div>`;
    document.body.appendChild(panel);
  }
  const content = document.getElementById('svg-panel-content');
  const toggleBtn = document.getElementById('svg-toggle-btn');
  const closeBtn  = document.getElementById('svg-close-btn');

  let showingXml = false;
  const renderImg = () => {
    content.innerHTML = `<img src="data:image/svg+xml,${encodeURIComponent(svgCode)}" style="max-width:100%;" alt="SVG">`;
  };
  renderImg();

  toggleBtn.onclick = () => {
    showingXml = !showingXml;
    toggleBtn.textContent = showingXml ? 'Image' : 'XML';
    if (showingXml) {
      content.innerHTML = `<pre style="font-size:12px;white-space:pre-wrap;word-break:break-all;padding:8px;background:var(--bg-raised);border-radius:6px;">${escHtml(svgCode)}</pre>`;
    } else renderImg();
  };
  closeBtn.onclick = () => panel.remove();
}

// ── Textarea auto-resize ───────────────────────────────────────────────────

export function autoResize(textarea, maxLines = 6) {
  const lh = parseFloat(getComputedStyle(textarea).lineHeight) || 22;
  const pad = parseFloat(getComputedStyle(textarea).paddingTop || '0')
            + parseFloat(getComputedStyle(textarea).paddingBottom || '0');
  textarea.style.height = 'auto';
  const max = lh * maxLines + pad;
  textarea.style.height = Math.min(textarea.scrollHeight, max) + 'px';
  textarea.style.overflowY = textarea.scrollHeight > max ? 'auto' : 'hidden';
}

// ── Escape helpers ────────────────────────────────────────────────────────

export function escHtml(str) {
  return String(str)
    .replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;')
    .replace(/"/g,'&quot;').replace(/'/g,'&#39;');
}

export function escAttr(str) {
  return String(str).replace(/"/g,'&quot;');
}

window.ui = { showNotification, showContextMenu, showUserMenu, renderMarkdown };