/**
 * Multi-agent swarm panel — animated cards, live activity, progress.
 */

/** @type {Record<string, { icon: string, hue: number, short: string }>} */
export const AGENT_VISUAL = {
  host: { icon: '◎', hue: 168, short: 'Host' },
  hot: { icon: '⚡', hue: 28, short: 'Hot' },
  processes: { icon: '⧉', hue: 210, short: 'Procs' },
  anomalies: { icon: '⚑', hue: 0, short: 'Alerts' },
  fleet: { icon: '⬡', hue: 265, short: 'Fleet' },
  storage: { icon: '▣', hue: 45, short: 'Store' },
}

/**
 * @param {HTMLElement|null|undefined} host
 * @param {{
 *   onStop?: () => void,
 * }} [opts]
 */
export function createSwarmPanel(host, opts = {}) {
  /** @type {Map<string, {
   *   el: HTMLElement,
   *   status: string,
   *   label: string,
   *   description?: string,
   *   activity: string,
   *   summary?: string,
   *   startedAt?: number,
   *   finishedAt?: number,
   * }>} */
  const cards = new Map()
  /** @type {Array<{ t: number, text: string, kind: string }>} */
  let log = []
  let total = 0
  let done = 0
  let panelOpen = false
  /** @type {ReturnType<typeof setInterval>|null} */
  let tickTimer = null

  function vis(id) {
    return AGENT_VISUAL[id] || { icon: '◆', hue: 200, short: id }
  }

  function ensureShell() {
    if (!host) return null
    if (host.querySelector('.qvac-swarm')) return host.querySelector('.qvac-swarm')
    host.innerHTML = `
      <div class="qvac-swarm" data-state="idle">
        <header class="qvac-swarm-head">
          <div class="qvac-swarm-brand">
            <span class="qvac-swarm-orb" aria-hidden="true">
              <span class="qvac-swarm-orb-core"></span>
              <span class="qvac-swarm-orb-ring"></span>
              <span class="qvac-swarm-orb-ring qvac-swarm-orb-ring-2"></span>
            </span>
            <div class="qvac-swarm-titles">
              <strong class="qvac-swarm-title">Multi-agent swarm</strong>
              <span class="qvac-swarm-subtitle muted">Dispatching specialists…</span>
            </div>
          </div>
          <div class="qvac-swarm-progress-wrap" title="Agents finished">
            <svg class="qvac-swarm-ring" viewBox="0 0 36 36" aria-hidden="true">
              <path class="qvac-swarm-ring-bg" d="M18 2.5a15.5 15.5 0 1 1 0 31 15.5 15.5 0 0 1 0-31z"/>
              <path class="qvac-swarm-ring-fg" d="M18 2.5a15.5 15.5 0 1 1 0 31 15.5 15.5 0 0 1 0-31z"
                stroke-dasharray="0 100" pathLength="100"/>
            </svg>
            <span class="qvac-swarm-count">0/0</span>
          </div>
        </header>
        <div class="qvac-swarm-grid" role="list"></div>
        <div class="qvac-swarm-log" aria-live="polite">
          <div class="qvac-swarm-log-inner"></div>
        </div>
        <footer class="qvac-swarm-foot muted">
          <span class="qvac-swarm-foot-status">Idle</span>
          <span class="qvac-swarm-foot-hint">Live tool specialists · parallel</span>
        </footer>
      </div>
    `
    return host.querySelector('.qvac-swarm')
  }

  function startTick() {
    stopTick()
    tickTimer = setInterval(() => {
      for (const [id, st] of cards) {
        if (st.status !== 'running' && st.status !== 'start') continue
        const el = st.el
        const timer = el?.querySelector('.qvac-agent-card-timer')
        if (timer && st.startedAt) {
          timer.textContent = `${((Date.now() - st.startedAt) / 1000).toFixed(1)}s`
        }
      }
    }, 120)
  }

  function stopTick() {
    if (tickTimer) clearInterval(tickTimer)
    tickTimer = null
  }

  /**
   * @param {Array<{ id: string, label: string, description?: string }>} agents
   * @param {string} [query]
   */
  function begin(agents, query = '') {
    if (!host) return
    host.classList.remove('hidden')
    panelOpen = true
    cards.clear()
    log = []
    total = agents.length
    done = 0
    const shell = ensureShell()
    if (!shell) return
    shell.dataset.state = 'running'
    const grid = shell.querySelector('.qvac-swarm-grid')
    const logInner = shell.querySelector('.qvac-swarm-log-inner')
    if (grid) grid.innerHTML = ''
    if (logInner) logInner.innerHTML = ''
    const sub = shell.querySelector('.qvac-swarm-subtitle')
    if (sub) {
      sub.textContent = query
        ? `Investigating: ${String(query).slice(0, 72)}${query.length > 72 ? '…' : ''}`
        : 'Dispatching specialists…'
    }
    updateProgress(shell)
    setFoot(shell, 'Spawning agents…', true)
    pushLog(shell, 'swarm', `Launching ${agents.length} specialist${agents.length === 1 ? '' : 's'}`)

    agents.forEach((a, i) => {
      const v = vis(a.id)
      const el = document.createElement('article')
      el.className = 'qvac-agent-card'
      el.dataset.status = 'queued'
      el.dataset.agent = a.id
      el.style.setProperty('--agent-hue', String(v.hue))
      el.style.setProperty('--agent-delay', `${i * 60}ms`)
      el.setAttribute('role', 'listitem')
      el.innerHTML = `
        <div class="qvac-agent-card-glow" aria-hidden="true"></div>
        <header class="qvac-agent-card-head">
          <span class="qvac-agent-avatar" aria-hidden="true">
            <span class="qvac-agent-avatar-ico">${v.icon}</span>
            <span class="qvac-agent-pulse"></span>
          </span>
          <div class="qvac-agent-card-meta">
            <strong class="qvac-agent-card-name">${esc(a.label)}</strong>
            <span class="qvac-agent-card-desc muted">${esc(a.description || v.short)}</span>
          </div>
          <span class="qvac-agent-card-badge">queued</span>
        </header>
        <div class="qvac-agent-card-activity">
          <span class="qvac-agent-activity-dot"></span>
          <span class="qvac-agent-activity-text">Waiting in queue…</span>
        </div>
        <div class="qvac-agent-card-result muted hidden"></div>
        <footer class="qvac-agent-card-foot">
          <span class="qvac-agent-card-timer">—</span>
          <span class="qvac-agent-card-state-ico" aria-hidden="true"></span>
        </footer>
      `
      grid?.appendChild(el)
      cards.set(a.id, {
        el,
        status: 'queued',
        label: a.label,
        description: a.description,
        activity: 'Waiting in queue…',
      })
      // Stagger entrance
      requestAnimationFrame(() => {
        requestAnimationFrame(() => el.classList.add('is-in'))
      })
    })
    startTick()
  }

  /**
   * @param {{
   *   id: string,
   *   label?: string,
   *   description?: string,
   *   status: string,
   *   activity?: string,
   *   summary?: string,
   *   error?: string,
   * }} ev
   */
  function update(ev) {
    if (!host || !panelOpen) return
    const shell = host.querySelector('.qvac-swarm')
    if (!shell) return
    let st = cards.get(ev.id)
    if (!st) {
      // Late card
      begin(
        [{ id: ev.id, label: ev.label || ev.id, description: ev.description }],
        ''
      )
      st = cards.get(ev.id)
    }
    if (!st) return

    const prev = st.status
    st.status = ev.status
    if (ev.activity) st.activity = ev.activity
    if (ev.summary) st.summary = ev.summary
    if (ev.error) st.summary = ev.error

    const el = st.el
    el.dataset.status = normalizeStatus(ev.status)

    if (ev.status === 'start' || ev.status === 'running') {
      if (!st.startedAt) st.startedAt = Date.now()
      el.dataset.status = 'running'
      setCardActivity(el, ev.activity || `Running ${ev.label || st.label}…`)
      setBadge(el, 'running')
      if (prev !== 'running' && prev !== 'start') {
        pushLog(shell, ev.id, `${st.label} started`)
      }
    } else if (ev.status === 'done') {
      st.finishedAt = Date.now()
      done = Math.min(total, done + (prev === 'done' ? 0 : 1))
      setCardActivity(el, ev.activity || 'Complete')
      setBadge(el, 'done')
      setResult(el, ev.summary || 'ok')
      const ms = st.startedAt ? Date.now() - st.startedAt : 0
      const timer = el.querySelector('.qvac-agent-card-timer')
      if (timer) timer.textContent = ms ? `${(ms / 1000).toFixed(1)}s` : 'ok'
      el.classList.add('is-done-pop')
      pushLog(shell, ev.id, `${st.label} finished${ev.summary ? ` · ${clip(ev.summary, 80)}` : ''}`)
    } else if (ev.status === 'error' || ev.status === 'stopped') {
      st.finishedAt = Date.now()
      if (prev !== 'done' && prev !== 'error') done = Math.min(total, done + 1)
      setCardActivity(el, ev.error || ev.summary || 'Failed')
      setBadge(el, ev.status === 'stopped' ? 'stopped' : 'error')
      setResult(el, ev.error || ev.summary || 'error', true)
      pushLog(
        shell,
        ev.id,
        `${st.label} ${ev.status === 'stopped' ? 'stopped' : 'error'}${ev.error ? ` · ${clip(ev.error, 60)}` : ''}`
      )
    }

    updateProgress(shell)
    const running = [...cards.values()].filter(
      (c) => c.status === 'start' || c.status === 'running'
    ).length
    if (done >= total && total > 0) {
      shell.dataset.state = 'complete'
      setFoot(shell, 'Swarm complete — synthesizing…', false)
      stopTick()
    } else {
      setFoot(
        shell,
        running ? `${running} agent${running === 1 ? '' : 's'} active` : 'Waiting…',
        true
      )
    }
  }

  function complete(note = 'Synthesizing final answer…') {
    if (!host) return
    const shell = host.querySelector('.qvac-swarm')
    if (!shell) return
    shell.dataset.state = 'complete'
    setFoot(shell, note, false)
    pushLog(shell, 'swarm', note)
    stopTick()
  }

  function fail(note = 'Stopped') {
    if (!host) return
    const shell = host.querySelector('.qvac-swarm')
    if (!shell) return
    shell.dataset.state = 'stopped'
    setFoot(shell, note, false)
    for (const st of cards.values()) {
      if (st.status === 'running' || st.status === 'start' || st.status === 'queued') {
        update({
          id: st.el.dataset.agent || '',
          status: 'stopped',
          summary: 'stopped',
        })
      }
    }
    stopTick()
  }

  function hide() {
    panelOpen = false
    stopTick()
    if (!host) return
    host.classList.add('hidden')
    host.innerHTML = ''
    cards.clear()
    log = []
  }

  function setCardActivity(el, text) {
    const t = el.querySelector('.qvac-agent-activity-text')
    if (t) t.textContent = text
  }

  function setBadge(el, status) {
    const b = el.querySelector('.qvac-agent-card-badge')
    if (!b) return
    b.textContent = status
    b.dataset.status = status
  }

  function setResult(el, text, isErr = false) {
    const r = el.querySelector('.qvac-agent-card-result')
    if (!r) return
    r.classList.remove('hidden')
    r.classList.toggle('is-error', isErr)
    r.textContent = clip(text, 160)
  }

  function updateProgress(shell) {
    const fg = shell.querySelector('.qvac-swarm-ring-fg')
    const count = shell.querySelector('.qvac-swarm-count')
    const pct = total ? Math.round((done / total) * 100) : 0
    if (fg) fg.setAttribute('stroke-dasharray', `${pct} 100`)
    if (count) count.textContent = `${done}/${total}`
  }

  function setFoot(shell, status, live) {
    const s = shell.querySelector('.qvac-swarm-foot-status')
    if (s) {
      s.textContent = status
      s.classList.toggle('is-live', Boolean(live))
    }
  }

  function pushLog(shell, kind, text) {
    log.push({ t: Date.now(), text, kind })
    const inner = shell.querySelector('.qvac-swarm-log-inner')
    if (!inner) return
    const line = document.createElement('div')
    line.className = 'qvac-swarm-log-line'
    line.dataset.kind = kind
    const v = vis(kind)
    line.innerHTML = `<span class="qvac-swarm-log-ico" style="--agent-hue:${v.hue}">${kind === 'swarm' ? '✦' : v.icon}</span><span class="qvac-swarm-log-text">${esc(text)}</span><span class="qvac-swarm-log-time muted">${timeNow()}</span>`
    inner.appendChild(line)
    // Keep last ~40 lines
    while (inner.children.length > 40) inner.removeChild(inner.firstChild)
    const logEl = shell.querySelector('.qvac-swarm-log')
    if (logEl) logEl.scrollTop = logEl.scrollHeight
    line.classList.add('is-in')
  }

  return { begin, update, complete, fail, hide, isOpen: () => panelOpen }
}

function normalizeStatus(s) {
  if (s === 'start') return 'running'
  return s
}

function clip(s, n) {
  const t = String(s || '')
  return t.length > n ? t.slice(0, n - 1) + '…' : t
}

function timeNow() {
  try {
    return new Date().toLocaleTimeString([], {
      hour: '2-digit',
      minute: '2-digit',
      second: '2-digit',
    })
  } catch {
    return ''
  }
}

function esc(s) {
  return String(s || '')
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
}