/**
 * Team workload dashboard — fetches and renders team metrics.
 * Tab "Current": snapshot of open tickets per agent.
 * Tab "Performance": resolved tickets per agent in a selectable period.
 */

const container = document.querySelector('.app-details-container[data-team-workload-url]');
if (container) {
  const dataUrl = container.dataset.teamWorkloadUrl;
  const labelNotAssigned = container.dataset.labelNotAssigned || '—';

  const elLoading = document.getElementById('team-loading');
  const elError = document.getElementById('team-error');
  const elEmpty = document.getElementById('team-empty');
  const elContent = document.getElementById('team-content');
  const elCurrentBody = document.getElementById('team-table-current');
  const elPerformanceBody = document.getElementById('team-table-performance');
  const elRefresh = container.querySelector('button[name="team-refresh"]');
  const periodSelector = document.getElementById('team-period-selector');

  let currentPeriod = 90;

  function showState(state) {
    if (elLoading) elLoading.hidden = state !== 'loading';
    if (elError) elError.hidden = state !== 'error';
    if (elEmpty) elEmpty.hidden = state !== 'empty';
    if (elContent) elContent.hidden = state !== 'success';
    if (elLoading) elLoading.setAttribute('aria-busy', state === 'loading' ? 'true' : 'false');
  }

  function setText(id, value) {
    const el = document.getElementById(id);
    if (el) el.textContent = value;
  }

  function agentName(m) {
    return m.support_user === '' ? labelNotAssigned : m.display_name;
  }

  /**
   * Create a table cell with an inline proportional bar behind the value.
   * Stripe-style: the bar gives instant visual comparison across rows.
   */
  function barCell(value, max, variant) {
    const td = document.createElement('td');
    const pct = max > 0 ? Math.round((value / max) * 100) : 0;

    const wrap = document.createElement('span');
    wrap.className = 'helpdesk-team-bar-cell';

    const bar = document.createElement('span');
    bar.className = 'helpdesk-team-bar';
    if (variant) bar.classList.add('helpdesk-team-bar-' + variant);
    bar.style.width = pct + '%';

    const label = document.createElement('span');
    label.className = 'helpdesk-team-bar-value';
    label.textContent = String(value);
    if (value === 0) label.classList.add('helpdesk-team-muted');

    wrap.appendChild(bar);
    wrap.appendChild(label);
    td.appendChild(wrap);
    return td;
  }

  /**
   * Create a badge cell — small pill for critical counts.
   * 0 = muted text, >0 = warning badge.
   */
  function badgeCell(value) {
    const td = document.createElement('td');
    if (value === 0) {
      td.textContent = '0';
      td.classList.add('helpdesk-team-muted');
    } else {
      const badge = document.createElement('span');
      badge.className = 'helpdesk-team-badge';
      badge.textContent = String(value);
      td.appendChild(badge);
    }
    return td;
  }

  /**
   * Create a plain text cell, muted when value is 0.
   */
  function valueCell(value, unit) {
    const td = document.createElement('td');
    td.textContent = unit ? value + unit : String(value);
    if (value === 0) td.classList.add('helpdesk-team-muted');
    return td;
  }

  function renderCurrentTab(kpis, members) {
    setText('team-kpi-open', kpis.open_tickets ?? 0);
    setText('team-kpi-unassigned', kpis.unassigned ?? 0);
    setText('team-kpi-avg-age', kpis.avg_age_hours ?? 0);

    if (!elCurrentBody) return;
    elCurrentBody.replaceChildren();

    const maxOpen = Math.max(1, ...members.map(m => m.open_tickets));

    for (const m of members) {
      const tr = document.createElement('tr');
      const isUnassigned = m.support_user === '';

      // Agent name
      const nameCell = document.createElement('td');
      nameCell.className = 'helpdesk-team-agent-name';
      nameCell.textContent = agentName(m);
      tr.appendChild(nameCell);

      // Open tickets with proportional bar
      tr.appendChild(barCell(m.open_tickets, maxOpen, isUnassigned ? 'muted' : 'primary'));

      // Critical with badge
      tr.appendChild(badgeCell(m.critical_tickets));

      // Avg age
      tr.appendChild(valueCell(m.avg_age_hours, 'h'));

      if (isUnassigned) tr.classList.add('helpdesk-team-row-unassigned');
      elCurrentBody.appendChild(tr);
    }
  }

  function renderPerformanceTab(kpis, members) {
    setText('team-kpi-resolved', kpis.resolved_in_period ?? 0);

    if (!elPerformanceBody) return;
    elPerformanceBody.replaceChildren();

    const sorted = [...members].sort((a, b) => {
      if (a.support_user === '') return 1;
      if (b.support_user === '') return -1;
      return b.resolved_in_period - a.resolved_in_period;
    });

    const maxResolved = Math.max(1, ...sorted.map(m => m.resolved_in_period));

    for (const m of sorted) {
      const tr = document.createElement('tr');
      const isUnassigned = m.support_user === '';

      const nameCell = document.createElement('td');
      nameCell.className = 'helpdesk-team-agent-name';
      nameCell.textContent = agentName(m);
      tr.appendChild(nameCell);

      tr.appendChild(barCell(m.resolved_in_period, maxResolved, isUnassigned ? 'muted' : 'success'));

      if (isUnassigned) tr.classList.add('helpdesk-team-row-unassigned');
      elPerformanceBody.appendChild(tr);
    }
  }

  function renderAll(data) {
    renderCurrentTab(data.kpis, data.members);
    renderPerformanceTab(data.kpis, data.members);
  }

  async function fetchData(refresh = false) {
    showState('loading');

    const params = new URLSearchParams({ periodDays: String(currentPeriod) });
    if (refresh) params.set('refresh', '1');

    try {
      const res = await fetch(dataUrl + '?' + params.toString(), { credentials: 'same-origin' });
      const json = await res.json();

      if (!json.ok) {
        showState('error');
        return;
      }

      if (!json.members || json.members.length === 0) {
        showState('empty');
        return;
      }

      renderAll(json);
      showState('success');
    } catch {
      showState('error');
    }
  }

  if (periodSelector) {
    periodSelector.addEventListener('change', (e) => {
      const radio = e.target.closest('input[name="team-period"]');
      if (!radio) return;
      const period = parseInt(radio.value, 10);
      if (!period || period === currentPeriod) return;
      currentPeriod = period;
      fetchData();
    });
  }

  if (elRefresh) {
    elRefresh.addEventListener('click', () => fetchData(true));
  }

  fetchData();
}