/* ObsiGate — AI Editor Toolbar
   Provides AI-powered text editing features:
   - Inline completion (Ctrl+J)
   - Edit (improve, fix spelling, shorter, longer, simplify)
   - Tone (professional, casual)
   - Translate (multiple languages)
   - Generate (explain, summarize, continue)
   - AI Custom Rewrite
   - AI Toolbox (to list, to table, frontmatter, to canvas)
*/
import { api } from './auth.js';
import { t } from './i18n.js';

// ── API call helper ──
async function aiAction(endpoint, text, extra = {}) {
  const body = { text, ...extra };
  const data = await api(`/api/ai/${endpoint}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  });
  return data.result;
}

// ── Get selected text from CodeMirror ──
function getSelection(editorView) {
  if (!editorView) return '';
  const { from, to } = editorView.state.selection.main;
  if (from === to) {
    // No selection — get entire document
    return editorView.state.doc.toString();
  }
  return editorView.state.doc.sliceString(from, to);
}

// ── Replace or insert text ──
function replaceSelection(editorView, newText, mode = 'replace') {
  if (!editorView) return;
  const { from, to } = editorView.state.selection.main;
  if (mode === 'append') {
    // Insert at end of selection
    editorView.dispatch({
      changes: { from: to, insert: '\n' + newText },
      selection: { anchor: to + 1 + newText.length },
    });
  } else if (mode === 'before') {
    editorView.dispatch({
      changes: { from: from, insert: newText + '\n' },
    });
  } else {
    // Replace selection
    editorView.dispatch({
      changes: { from, to, insert: newText },
      selection: { anchor: from + newText.length },
    });
  }
}

// ── Show toast notification ──
function showToast(msg, type = 'info') {
  // Use global showToast if available, otherwise console
  if (typeof window._obsigateShowToast === 'function') {
    window._obsigateShowToast(msg, type);
  }
}

// ── Dropdown menu builder ──
function createMenu(items, parentEl) {
  // Remove any existing menu
  const existing = document.querySelector('.ai-dropdown-menu');
  if (existing) existing.remove();

  const menu = document.createElement('div');
  menu.className = 'ai-dropdown-menu';

  // Position relative to parent, but attached to body to avoid
  // being clipped by overflow:hidden on the editor container.
  const rect = parentEl.getBoundingClientRect();
  const menuTop = rect.bottom + 4;
  const menuLeft = rect.left;

  Object.assign(menu.style, {
    position: 'fixed',
    top: menuTop + 'px',
    left: menuLeft + 'px',
    background: 'var(--bg-primary)',
    border: '1px solid var(--border-color)',
    borderRadius: '6px',
    padding: '4px 0',
    minWidth: '200px',
    maxHeight: '60vh',
    overflowY: 'auto',
    zIndex: '10000',
    boxShadow: '0 4px 16px rgba(0,0,0,0.4)',
  });

  // If menu overflows bottom of viewport, flip above the button
  requestAnimationFrame(() => {
    const menuRect = menu.getBoundingClientRect();
    if (menuRect.bottom > window.innerHeight - 8) {
      menu.style.top = Math.max(8, rect.top - menuRect.height - 4) + 'px';
    }
    // If menu overflows right edge, align right
    if (menuRect.right > window.innerWidth - 8) {
      menu.style.left = Math.max(8, window.innerWidth - menuRect.width - 8) + 'px';
    }
  });

  items.forEach(item => {
    const el = document.createElement('div');
    el.className = 'ai-menu-item';
    Object.assign(el.style, {
      padding: '6px 12px',
      cursor: 'pointer',
      display: 'flex',
      alignItems: 'center',
      gap: '8px',
      fontSize: '0.8rem',
      color: 'var(--text-primary)',
      whiteSpace: 'nowrap',
      background: 'transparent',
      transition: 'background 0.1s',
    });
    el.innerHTML = item.label;
    if (item.hint) {
      const hint = document.createElement('span');
      hint.style.cssText = 'margin-left:auto;font-size:0.65rem;color:var(--text-muted)';
      hint.textContent = item.hint;
      el.appendChild(hint);
    }
    if (item.children) {
      const arrow = document.createElement('span');
      arrow.style.cssText = 'margin-left:auto;font-size:0.7rem;color:var(--text-muted)';
      arrow.textContent = '▶';
      el.appendChild(arrow);
    }
    el.addEventListener('mouseenter', () => {
      el.style.background = 'rgba(255,255,255,0.06)';
      // Show submenu
      if (item.children) {
        const sub = el.querySelector('.ai-submenu');
        if (!sub) {
          const subMenu = createSubMenu(item.children, el);
          el.appendChild(subMenu);
        }
      }
    });
    el.addEventListener('mouseleave', (e) => {
      el.style.background = 'transparent';
    });
    el.addEventListener('click', (e) => {
      e.stopPropagation();
      if (item.action) item.action();
      menu.remove();
    });
    menu.appendChild(el);
  });

  document.body.appendChild(menu);

  // Close on outside click
  const closeHandler = (e) => {
    if (!menu.contains(e.target)) {
      menu.remove();
      document.removeEventListener('click', closeHandler);
    }
  };
  setTimeout(() => document.addEventListener('click', closeHandler), 0);
}

function createSubMenu(items, parentEl) {
  const menu = document.createElement('div');
  menu.className = 'ai-submenu';
  Object.assign(menu.style, {
    position: 'absolute',
    left: '100%',
    top: '0',
    background: 'var(--bg-primary)',
    border: '1px solid var(--border-color)',
    borderRadius: '6px',
    padding: '4px 0',
    minWidth: '180px',
    zIndex: '101',
    boxShadow: '0 4px 16px rgba(0,0,0,0.4)',
  });

  items.forEach(item => {
    const el = document.createElement('div');
    el.className = 'ai-menu-item';
    Object.assign(el.style, {
      padding: '6px 12px',
      cursor: 'pointer',
      fontSize: '0.78rem',
      color: 'var(--text-primary)',
      whiteSpace: 'nowrap',
    });
    el.innerHTML = item.label;
    el.addEventListener('mouseenter', () => { el.style.background = 'rgba(255,255,255,0.06)'; });
    el.addEventListener('mouseleave', () => { el.style.background = 'transparent'; });
    el.addEventListener('click', (e) => {
      e.stopPropagation();
      if (item.action) item.action();
      // Close all menus
      document.querySelectorAll('.ai-dropdown-menu, .ai-submenu').forEach(m => m.remove());
    });
    menu.appendChild(el);
  });

  return menu;
}

// ── Main AI Toolbar ──
export async function createAIToolbar(container, getEditorView) {
  // Check if AI is configured
  let aiConfigured = false;
  try {
    const status = await api('/api/ai/status');
    aiConfigured = status.configured;
  } catch { aiConfigured = false; }
  
  if (!aiConfigured) {
    const hint = document.createElement('div');
    hint.style.cssText = 'padding:6px 12px;font-size:0.7rem;color:var(--text-muted);border-bottom:1px solid var(--border-color)';
    hint.textContent = t('ai.not_configured');
    container.appendChild(hint);
    return;
  }

  const toolbar = document.createElement('div');
  toolbar.className = 'ai-toolbar';
  Object.assign(toolbar.style, {
    display: 'flex',
    alignItems: 'center',
    gap: '2px',
    padding: '4px 8px',
    borderBottom: '1px solid var(--border-color)',
    background: 'var(--bg-secondary)',
    flexWrap: 'wrap',
    position: 'sticky',
    top: '0',
    zIndex: '5',
  });

  function ev() { return getEditorView(); }

  // ── Inline completion button ──
  const aiBtn = document.createElement('button');
  aiBtn.className = 'ai-toolbar-btn';
  aiBtn.innerHTML = '✦ AI';
  Object.assign(aiBtn.style, {
    color: '#60a5fa',
    fontWeight: '600',
    fontSize: '0.75rem',
    background: 'none',
    border: 'none',
    cursor: 'pointer',
    padding: '3px 8px',
    borderRadius: '4px',
  });
  aiBtn.title = t('ai.inline_completion_title');
  aiBtn.addEventListener('click', async () => {
    const v = ev();
    if (!v) return;
    const text = getSelection(v);
    if (!text.trim()) return;
    const origHTML = aiBtn.innerHTML;
    aiBtn.innerHTML = '⏳ AI...';
    aiBtn.disabled = true;
    try {
      const result = await aiAction('inline-complete', text);
      replaceSelection(v, result, 'append');
      showToast(t('ai.completion_added'), 'success');
    } catch (e) {
      showToast('AI: ' + (String(e.message || e).includes('401') ? t('ai.error_invalid_key') : e.message), 'error');
    } finally {
      aiBtn.innerHTML = origHTML;
      aiBtn.disabled = false;
    }
  });

  // ── Edit menu ──
  const editBtn = createDropdownBtn(t('ai.edit'), [
    { label: '🪄 Improve writing', action: () => action('improve'), hint: t('ai.hint_improve') },
    { label: '🔤 Fix spelling & grammar', action: () => action('fix-spelling'), hint: 'Corrige les fautes' },
    { label: '📏 Make shorter', action: () => action('make-shorter'), hint: 'Rend le texte plus concis' },
    { label: '📐 Make longer', action: () => action('make-longer'), hint: t('ai.hint_add_details') },
    { label: '📋 Simplify language', action: () => action('simplify'), hint: 'Simplifie le langage' },
  ], t('ai.hint_edit_selection'));

  // ── Tone menu ──
  const toneBtn = createDropdownBtn('Ton', [
    { label: '💼 Professional tone', action: () => action('tone', { tone: 'professional' }) },
    { label: '💬 Casual tone', action: () => action('tone', { tone: 'casual' }) },
  ], 'Change le ton du texte');

  // ── Translate menu ──
  const translateBtn = createDropdownBtn('Traduire', [
    { label: '🇬🇧 English', action: () => action('translate', { target_lang: 'English' }) },
    { label: '🇨🇳 Chinese', action: () => action('translate', { target_lang: 'Chinese' }) },
    { label: '🇯🇵 Japanese', action: () => action('translate', { target_lang: 'Japanese' }) },
    { label: '🇩🇪 German', action: () => action('translate', { target_lang: 'German' }) },
    { label: '🇫🇷 French', action: () => action('translate', { target_lang: 'French' }) },
    { label: '🇪🇸 Spanish', action: () => action('translate', { target_lang: 'Spanish' }) },
  ], t('ai.hint_translate'));

  // ── Generate menu ──
  const genBtn = createDropdownBtn(t('ai.generate'), [
    { label: 'ℹ️ Explain this', action: () => action('explain', {}, 'append') },
    { label: '📝 Summarize', action: () => action('summarize', {}, 'append') },
    { label: '✏️ Continue writing', action: () => action('continue', {}, 'append') },
  ], t('ai.hint_generate'));

  // ── Custom Rewrite ──
  const rewriteBtn = document.createElement('button');
  rewriteBtn.className = 'ai-toolbar-btn';
  rewriteBtn.innerHTML = t('ai.rewrite');
  rewriteBtn.title = t('ai.rewrite_title');
  Object.assign(rewriteBtn.style, {
    fontSize: '0.7rem',
    background: 'transparent',
    border: 'none',
    cursor: 'pointer',
    padding: '3px 6px',
    borderRadius: '4px',
    color: 'var(--text-primary)',
  });
  rewriteBtn.addEventListener('click', async () => {
    const v = ev();
    if (!v) return;
    const text = getSelection(v);
    const instruction = prompt(t('ai.rewrite_prompt'), '');
    if (!instruction) return;
    try {
      const result = await aiAction('rewrite', text, { instruction });
      replaceSelection(v, result);
      showToast(t('ai.text_rewritten'), 'success');
    } catch (e) {
      showToast('AI: ' + (String(e.message || e).includes('401') ? t('ai.error_invalid_key') : e.message), 'error');
    }
  });

  // ── Toolbox menu ──
  const toolboxBtn = createDropdownBtn(t('ai.toolbox'), [
    { label: '📋 Convert to list', action: () => action('to-list') },
    { label: '📊 Convert to table', action: () => action('to-table') },
    { label: '⚙️ Generate frontmatter', action: () => action('frontmatter', {}, 'before') },
    { label: '🔷 Convert to canvas', action: () => action('to-canvas', {}, 'append') },
  ], 'Outils de conversion');

  toolbar.appendChild(aiBtn);
  toolbar.appendChild(createSeparator());
  toolbar.appendChild(editBtn);
  toolbar.appendChild(toneBtn);
  toolbar.appendChild(translateBtn);
  toolbar.appendChild(createSeparator());
  toolbar.appendChild(genBtn);
  toolbar.appendChild(rewriteBtn);
  toolbar.appendChild(toolboxBtn);

  container.insertBefore(toolbar, container.firstChild);

  // ── Action helper ──
  async function action(endpoint, extra = {}, mode = 'replace') {
    const v = ev();
    if (!v) return;
    const text = getSelection(v);
    if (!text.trim()) {
      showToast(t('ai.select_text'), 'warning');
      return;
    }
    showToast(t('ai.processing'), 'info');

    // Show processing indicator in the editor header
    _showProcessingIndicator(true);

    // Dispatch AI processing start event
    document.dispatchEvent(new CustomEvent('ai-processing-start', { detail: { endpoint, mode } }));
    try {
      const result = await aiAction(endpoint, text, extra);
      replaceSelection(v, result, mode);
      showToast(t('ai.text_processed'), 'success');
    } catch (e) {
      const msg = String(e.message || e);
      if (msg.includes('401')) {
        showToast(t('ai.invalid_api_key'), 'error');
      } else if (msg.includes('402') || msg.includes('429')) {
        showToast(t('ai.quota_exceeded'), 'error');
      } else {
        showToast('AI: ' + msg, 'error');
      }
    } finally {
      _showProcessingIndicator(false);
      // Dispatch AI processing end event
      document.dispatchEvent(new CustomEvent('ai-processing-end'));
    }
  }

  // ── In-editor processing indicator ──
  function _showProcessingIndicator(show) {
    let el = document.getElementById('ai-processing-indicator');
    if (show) {
      if (!el) {
        el = document.createElement('span');
        el.id = 'ai-processing-indicator';
        el.className = 'ai-processing-indicator';
        el.innerHTML = '<span class="ai-spinner"></span> AI...';
        el.title = 'Traitement AI en cours';
        const header = document.querySelector('#editor-modal .editor-header');
        if (header) header.appendChild(el);
      }
      el.style.display = 'inline-flex';
    } else if (el) {
      el.style.display = 'none';
    }
  }
  // ── Keyboard shortcut Ctrl+J for inline completion ──
  document.addEventListener('keydown', (e) => {
    if (e.ctrlKey && e.key === 'j') {
      const modal = document.getElementById('editor-modal');
      if (!modal || !modal.classList.contains('active')) return;
      e.preventDefault();
      aiBtn.click();
    }
  });

  return toolbar;
}

function createDropdownBtn(text, items, tooltip = '') {
  const btn = document.createElement('button');
  btn.className = 'ai-toolbar-btn';
  btn.innerHTML = text + ' ▾';
  btn.title = tooltip || text;
  Object.assign(btn.style, {
    position: 'relative',
    fontSize: '0.7rem',
    background: 'none',
    border: 'none',
    cursor: 'pointer',
    padding: '3px 6px',
    borderRadius: '4px',
    color: 'var(--text-primary)',
  });
  btn.addEventListener('click', (e) => {
    e.stopPropagation();
    createMenu(items, btn);
  });
  btn.addEventListener('mouseenter', () => { btn.style.background = 'rgba(255,255,255,0.08)'; });
  btn.addEventListener('mouseleave', () => { btn.style.background = 'transparent'; });
  return btn;
}

function createSeparator() {
  const sep = document.createElement('span');
  sep.style.cssText = 'width:1px;height:16px;background:var(--border-color);margin:0 2px';
  return sep;
}