/**
 * Session Inspector — right panel with full state rendering
 */

let inspectorEl;

export function initInspector() {
  inspectorEl = document.getElementById('inspector');
  clearInspector();
}

export function clearInspector() {
  if (!inspectorEl) return;
  inspectorEl.innerHTML = '<div class="inspector-empty">No session selected</div>';
}

export function updateInspector(session) {
  if (!inspectorEl || !session) return;

  inspectorEl.innerHTML = '';

  // Header
  inspectorEl.appendChild(buildSection('Session', `
    <div class="inspector-field">
      <span class="label">ID</span>
      <span class="value truncate" style="max-width:180px" title="${session.session_id}">${session.session_id.substring(0, 16)}...</span>
    </div>
    <div class="inspector-field">
      <span class="label">Status</span>
      <span class="badge ${session.status}">${session.status}</span>
    </div>
    <div class="inspector-field">
      <span class="label">Turns</span>
      <span class="value">${session.turn_count}</span>
    </div>
    <div class="inspector-field">
      <span class="label">Created</span>
      <span class="value">${formatTime(session.created_at)}</span>
    </div>
    <div class="inspector-field">
      <span class="label">Updated</span>
      <span class="value">${formatTime(session.updated_at)}</span>
    </div>
  `));

  // Current Task
  if (session.current_task) {
    const task = session.current_task;
    let taskHtml = `
      <div class="inspector-field">
        <span class="label">Objective</span>
      </div>
      <div class="text-sm" style="margin-bottom:6px;color:var(--text-primary)">${escapeHtml(task.objective)}</div>
      <div class="inspector-field">
        <span class="label">Status</span>
        <span class="badge ${task.status}">${task.status}</span>
      </div>
      <div class="inspector-field">
        <span class="label">Step</span>
        <span class="value">${task.current_step_index + 1} / ${(task.plan || []).length}</span>
      </div>
    `;

    // Facts
    if (task.facts_extracted && task.facts_extracted.length > 0) {
      taskHtml += '<div class="mt-2"><span class="label text-sm">Facts:</span><ul style="padding-left:16px;margin-top:4px">';
      for (const f of task.facts_extracted.slice(-8)) {
        taskHtml += `<li class="text-sm">${escapeHtml(f)}</li>`;
      }
      taskHtml += '</ul></div>';
    }

    // Constraints
    if (task.constraints && task.constraints.length > 0) {
      taskHtml += '<div class="mt-2"><span class="label text-sm">Constraints:</span><ul style="padding-left:16px;margin-top:4px">';
      for (const c of task.constraints) {
        taskHtml += `<li class="text-sm">${escapeHtml(c)}</li>`;
      }
      taskHtml += '</ul></div>';
    }

    inspectorEl.appendChild(buildSection('Current Task', taskHtml));

    // Plan
    if (task.plan && task.plan.length > 0) {
      let planHtml = '<div class="timeline">';
      for (let i = 0; i < task.plan.length; i++) {
        const step = task.plan[i];
        const stepStatus = step.status || 'pending';
        const isActive = i === task.current_step_index && task.status === 'executing';
        const stepClass = isActive ? 'active' : (stepStatus === 'completed' ? 'completed' : stepStatus === 'failed' ? 'failed' : '');

        planHtml += `
          <div class="timeline-step ${stepClass}">
            <div class="timeline-step-header">
              <span class="role-badge ${step.agent_role || 'coder'}">${step.agent_role || 'coder'}</span>
              <span class="badge ${stepStatus}">${stepStatus}</span>
            </div>
            <div class="timeline-step-desc">${escapeHtml(step.description)}</div>
            ${step.tools_used && step.tools_used.length > 0 ? `
              <div class="timeline-tools">
                ${step.tools_used.map(t => `<span class="tool-chip">${escapeHtml(t)}</span>`).join('')}
              </div>
            ` : ''}
            ${step.result_summary ? `<div class="text-sm text-muted mt-2">${escapeHtml(step.result_summary.substring(0, 200))}</div>` : ''}
          </div>
        `;
      }
      planHtml += '</div>';
      inspectorEl.appendChild(buildSection('Execution Plan', planHtml));
    }
  }

  // Completed tasks
  if (session.completed_tasks && session.completed_tasks.length > 0) {
    let html = '<ul style="padding-left:16px">';
    for (const t of session.completed_tasks) {
      html += `<li class="text-sm mono">${t}</li>`;
    }
    html += '</ul>';
    inspectorEl.appendChild(buildSection(`Completed (${session.completed_tasks.length})`, html));
  }
}

function buildSection(title, innerHtml) {
  const section = document.createElement('div');
  section.className = 'inspector-section';
  section.innerHTML = `<div class="inspector-section-title">${title}</div>${innerHtml}`;
  return section;
}

function formatTime(isoStr) {
  if (!isoStr) return '—';
  try {
    return new Date(isoStr).toLocaleTimeString('en-US', { hour12: false });
  } catch {
    return isoStr;
  }
}

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