/**
 * static/js/status.js
 * Renders the server status and agent activity panels,
 * and the config settings panel.
 */

import { state } from './state.js';
import { api } from './api.js';
import { toast } from './app.js';

// ── Time helpers ──────────────────────────────────────────────────────────

function fmtTime(isoStr) {
  if (!isoStr) return '–';
  const d = new Date(isoStr);
  return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' });
}

function fmtRelative(isoStr) {
  if (!isoStr) return '–';
  const d = new Date(isoStr);
  const diff = Math.floor((Date.now() - d.getTime()) / 1000);
  if (diff < 5)   return 'just now';
  if (diff < 60)  return `${diff}s ago`;
  if (diff < 3600) return `${Math.floor(diff / 60)}m ago`;
  return `${Math.floor(diff / 3600)}h ago`;
}

// ── Server online indicator (header) ─────────────────────────────────────

function updateHeaderLeds(serverOnline, status) {
  const serverLed = document.getElementById('led-server');
  const agentLed  = document.getElementById('led-agent');

  if (!serverLed || !agentLed) return;

  if (state.get('sseReconnecting')) {
    serverLed.className = 'led led--amber led--pulse';
    serverLed.querySelector('.led__label').textContent = 'Reconnecting…';
  } else if (serverOnline) {
    serverLed.className = 'led led--green led--pulse';
    serverLed.querySelector('.led__label').textContent = 'Server Online';
  } else if (!serverOnline) {
    serverLed.className = 'led led--red';
    serverLed.querySelector('.led__label').textContent = 'Server Offline';
  }

  if (status?.agent?.connected) {
    agentLed.className = 'led led--cyan led--pulse';
    agentLed.querySelector('.led__label').textContent = 'Agent Connected';
  } else {
    agentLed.className = 'led led--muted';
    agentLed.querySelector('.led__label').textContent = 'Agent Idle';
  }
}

// ── Status sidebar panel ──────────────────────────────────────────────────

function renderStatusPanel(status) {
  const el = document.getElementById('status-panel-body');
  const serverTypeBadge = document.getElementById('server-type-badge');
  const versionBadge = document.getElementById('app-version-badge');
  if (!el || !status) return;

  const agent = status.agent ?? {};
  const queue = {
    pending_count: status.queue?.pending_count ?? 0,
    consumed_count: status.queue?.consumed_count ?? 0,
  };
  const serverType = status.server?.type || 'unknown';
  const version = status.server?.version || '–';

  if (serverTypeBadge) {
    serverTypeBadge.textContent = escapeHtml(serverType);
  }

  if (versionBadge) {
    versionBadge.textContent = `v${version}`;
  }

  el.innerHTML = `
    <div class="stat-row">
      <span class="stat-label">Server Up</span>
      <span class="stat-value">${fmtTime(status.server?.started_at)}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Version</span>
      <span class="stat-value">v${escapeHtml(version)}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Server Type</span>
      <span class="stat-value">${escapeHtml(serverType)}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Pending</span>
      <span class="stat-value stat-value--cyan">${queue.pending_count}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Consumed</span>
      <span class="stat-value stat-value--amber">${queue.consumed_count}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Agent</span>
      <span class="stat-value">${agent.agent_id ? escapeHtml(agent.agent_id) : '–'}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Last Seen</span>
      <span class="stat-value" data-ts-rel="${agent.last_seen_at || ''}">${fmtRelative(agent.last_seen_at)}</span>
    </div>
    <div class="stat-row">
      <span class="stat-label">Last Fetch</span>
      <span class="stat-value" data-ts-rel="${agent.last_fetch_at || ''}">${fmtRelative(agent.last_fetch_at)}</span>
    </div>
  `;
}

/** Called by app.js on a timer to keep relative times fresh. */
export function refreshStatusTimestamps() {
  document.querySelectorAll('[data-ts-rel]').forEach(el => {
    const iso = el.dataset.tsRel;
    if (iso) el.textContent = fmtRelative(iso);
  });
}

export function initStatus() {
  state.subscribe('serverOnline', (online) => {
    updateHeaderLeds(online, state.get('status'));
  });

  state.subscribe('status', (status) => {
    updateHeaderLeds(state.get('serverOnline'), status);
    renderStatusPanel(status);
  });
}

// ── Config panel ──────────────────────────────────────────────────────────

export function initConfig() {
  const form       = document.getElementById('config-form');
  const staleInput = document.getElementById('cfg-stale');
  const saveBtn    = document.getElementById('cfg-save');

  // Populate from state
  state.subscribe('config', (cfg) => {
    if (!cfg) return;
    staleInput.value = cfg.agent_stale_after_seconds;
  });

  form.addEventListener('submit', async (e) => {
    e.preventDefault();
    saveBtn.disabled = true;
    const original = saveBtn.innerHTML;
    saveBtn.innerHTML = '<span class="spinner"></span>';

    try {
      const cfg = await api.updateConfig({
        agent_stale_after_seconds: parseInt(staleInput.value, 10) || 30,
      });
      state.set('config', cfg);
      toast('Settings saved', 'success');
    } catch (e) {
      toast(e.message, 'error');
    } finally {
      saveBtn.disabled = false;
      saveBtn.innerHTML = original;
    }
  });
}

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