// ── Tool Call Visibility ──

const MODIFICATION_TOOLS = ['write_file', 'edit_file', 'delete_file', 'memory_write'];
const TOOL_DISPLAY_NAMES = {
  write_file: 'Datei schreiben',
  edit_file: 'Datei bearbeiten',
  delete_file: 'Datei löschen',
  memory_write: 'Erinnerungen festhalten',
  web_search: 'Web-Suche'
};

function isToolVisible(toolName) {
  const mode = loadSettings().toolCallDisplay;
  if (mode === 'all') return true;
  if (mode === 'hidden') return false;
  // 'modifications' – nur modifizierende Tools + web_search anzeigen
  if (toolName === 'web_search') return true;
  return MODIFICATION_TOOLS.includes(toolName);
}

// ── Chain Meta Visibility ──

function isChainMetaVisible(chainData) {
  const mode = loadSettings().chainMetaDisplay;
  if (mode === 'always') return true;
  if (mode === 'never') return false;
  // 'sometimes' – nur bei auffälligen Chains anzeigen
  if (!chainData) return false;
  const inOut = (chainData.inputTokens || 0) + (chainData.outputTokens || 0);
  if (inOut >= 10000) return true;
  if ((chainData.iterations || 0) >= 25) return true;
  if ((chainData.durationMs || 0) >= 90000) return true;
  return false;
}

// ── Tool Boxes ──

function addToolBoxLoading(name) {
  const div = document.createElement('div');
  div.className = 'tool-box streamed';
  div.dataset.toolName = name;
  const displayName = TOOL_DISPLAY_NAMES[name] || name;
  div.innerHTML = '<span class="tool-name">' + esc(displayName) + '</span> <span class="tool-spinner"><i class="fa fa-hourglass-half"></i></span>';
  chatEl().appendChild(div);
  scrollDown();
  return div;
}

function renderToolBoxContent(div, name, inputJson, result, isError, sources) {
  let parsedInput = null;
  try { parsedInput = JSON.parse(inputJson); } catch {}

  const header = document.createElement('div');
  header.className = 'tool-box-header';

  const nameSpan = document.createElement('span');
  nameSpan.className = 'tool-name';
  nameSpan.textContent = TOOL_DISPLAY_NAMES[name] || name;
  header.appendChild(nameSpan);

  if (isError) {
    const errSpan = document.createElement('span');
    errSpan.className = 'tool-error-badge';
    errSpan.textContent = 'error';
    header.appendChild(errSpan);
  }

  div.innerHTML = '';
  div.appendChild(header);

  let foldTarget = null;

  // Web-Search Sources – immer sichtbar, kein Toggle
  if (name === 'web_search' && sources && sources.length > 0) {
    const sourcesList = document.createElement('div');
    sourcesList.className = 'web-search-sources';
    sources.forEach(function(s) {
      const link = document.createElement('a');
      link.href = s.url;
      link.target = '_blank';
      link.rel = 'noopener noreferrer';
      link.className = 'web-search-source';
      var domain = '';
      try { domain = new URL(s.url).hostname.replace('www.', ''); } catch(e) { domain = s.url; }
      link.innerHTML = '<i class="fa fa-external-link"></i> <span class="source-domain">' + esc(domain) + '</span>' +
        (s.title ? '<span class="source-title">' + esc(s.title) + '</span>' : '');
      sourcesList.appendChild(link);
    });
    div.appendChild(sourcesList);
  }

  if (name === 'edit_file' && parsedInput && parsedInput.path) {
    const pathSpan = document.createElement('span');
    pathSpan.className = 'tool-input';
    pathSpan.textContent = parsedInput.path;
    header.appendChild(pathSpan);

    const diff = buildEditDiff(parsedInput.old_text || '', parsedInput.new_text || '');
    diff.hidden = true;
    div.appendChild(diff);
    foldTarget = diff;

  } else if (name === 'write_file' && parsedInput && parsedInput.path) {
    const pathSpan = document.createElement('span');
    pathSpan.className = 'tool-input';
    pathSpan.textContent = parsedInput.path;
    header.appendChild(pathSpan);

    const content = parsedInput.content || '';
    const lines = content.split('\n');
    const lineCount = lines.length;
    const charCount = content.length;

    const meta = document.createElement('span');
    meta.className = 'tool-write-meta';
    meta.textContent = lineCount + ' Zeilen, ' + charCount + ' Zeichen';
    header.appendChild(meta);

    const preview = buildWritePreview(content);
    preview.hidden = true;
    div.appendChild(preview);
    foldTarget = preview;

  } else if (name === 'todo_write') {
    // Todo-Liste: kein tool-input, standardmäßig sichtbar, custom parser
    if (result) {
      const todoList = buildTodoList(result, isError);
      div.appendChild(todoList);
      foldTarget = todoList;
    }

  } else {
    // Standard: path/command als input anzeigen
    let inputLabel = '';
    if (parsedInput) {
      inputLabel = parsedInput.path || parsedInput.command || JSON.stringify(parsedInput).substring(0, 120);
    } else {
      inputLabel = truncate(inputJson, 120);
    }
    if (inputLabel) {
      const inputSpan = document.createElement('span');
      inputSpan.className = 'tool-input';
      inputSpan.textContent = inputLabel;
      header.appendChild(inputSpan);
    }

    const resultDiv = document.createElement('div');
    resultDiv.className = 'tool-result' + (isError ? ' tool-error' : '');
    resultDiv.textContent = result || '';
    resultDiv.hidden = true;
    div.appendChild(resultDiv);
    foldTarget = resultDiv;
  }

  if (foldTarget && name !== 'todo_write') {
    header.style.cursor = 'pointer';
    header.addEventListener('click', () => {
      foldTarget.hidden = !foldTarget.hidden;
    });
  }
}

function _buildDiffLines(container, lines, type) {
  const cssClass = type === 'added' ? 'diff-added' : 'diff-removed';
  const markerChar = type === 'added' ? '+' : '-';
  for (const line of lines) {
    const row = document.createElement('div');
    row.className = 'diff-line ' + cssClass;
    const marker = document.createElement('span');
    marker.className = 'diff-marker';
    marker.textContent = markerChar;
    const content = document.createElement('span');
    content.className = 'diff-content';
    content.textContent = line;
    row.appendChild(marker);
    row.appendChild(content);
    container.appendChild(row);
  }
}

function buildEditDiff(oldText, newText) {
  const container = document.createElement('div');
  container.className = 'tool-diff';
  _buildDiffLines(container, oldText.split('\n'), 'removed');
  _buildDiffLines(container, newText.split('\n'), 'added');
  return container;
}

function buildWritePreview(content) {
  const container = document.createElement('div');
  container.className = 'tool-diff';
  _buildDiffLines(container, content.split('\n'), 'added');
  return container;
}

function buildTodoList(result, isError) {
  const container = document.createElement('div');
  container.className = 'todo-list' + (isError ? ' tool-error' : '');

  const lines = result.split('\n').filter(l => l.trim());
  for (const line of lines) {
    // Format: ICON [id] [priority] content
    const m = line.match(/^(\S+)\s+\[([^\]]+)\]\s+(?:\[([^\]]+)\]\s+)?(.+)$/);
    const row = document.createElement('div');
    row.className = 'todo-item';

    if (m) {
      const icon = m[1];   // ✅ / 🔄 / ⬜
      const id   = m[2];
      const prio = m[3] || null;
      const text = m[4];

      const statusClass =
        icon === '✅' ? 'todo-done' :
        icon === '🔄' ? 'todo-progress' :
        'todo-pending';
      row.classList.add(statusClass);

      const iconSpan = document.createElement('span');
      iconSpan.className = 'todo-icon';
      iconSpan.textContent = icon;

      const idSpan = document.createElement('span');
      idSpan.className = 'todo-id';
      idSpan.textContent = id + '.';

      const textSpan = document.createElement('span');
      textSpan.className = 'todo-text';
      textSpan.textContent = text;

      row.appendChild(iconSpan);
      row.appendChild(idSpan);
      row.appendChild(textSpan);

      if (prio) {
        const prioSpan = document.createElement('span');
        prioSpan.className = 'todo-prio todo-prio-' + prio.toLowerCase();
        prioSpan.textContent = prio;
        row.appendChild(prioSpan);
      }
    } else {
      row.textContent = line;
    }

    container.appendChild(row);
  }

  parseFluentEmojis(container);

  return container;
}

function finishToolBox(div, data) {
  if (!div) return;
  renderToolBoxContent(div, data.name, data.input, data.result, data.isError, data.sources);
  scrollDown();
}

function addToolBoxStatic(name, input, result, isError, sources) {
  const div = document.createElement('div');
  div.className = 'tool-box';
  div.dataset.toolName = name;
  renderToolBoxContent(div, name, input, result, isError, sources);
  chatEl().appendChild(div);
  scrollDown();
}

function appendToolResult(result, isError) {
  // Letzten tool-box im Chat finden und Result in die bereits vorhandene .tool-result-Div schreiben
  const boxes = chatEl().querySelectorAll('.tool-box');
  const lastBox = boxes[boxes.length - 1];
  if (!lastBox) return;

  // Wenn Diff vorhanden (edit_file/write_file) → kein Result anhängen
  if (lastBox.querySelector('.tool-diff')) return;

  const toolName = lastBox.dataset.toolName || '';
  const isTodoWrite = toolName === 'todo_write';

  if (isTodoWrite) {
    // Vorhandene todo-list ersetzen oder neu erstellen
    const existing = lastBox.querySelector('.todo-list');
    if (existing) existing.remove();
    if (result && !isError) {
      const todoList = buildTodoList(result, isError);
      lastBox.appendChild(todoList);
    }
    return;
  }

  const existing = lastBox.querySelector('.tool-result');
  if (existing) {
    existing.textContent = result || '';
    if (isError) existing.classList.add('tool-error');
  } else {
    const resultDiv = document.createElement('div');
    resultDiv.className = 'tool-result' + (isError ? ' tool-error' : '');
    resultDiv.textContent = result || '';
    resultDiv.hidden = true;
    lastBox.appendChild(resultDiv);
  }
}