// clientDashboard.js — Quick View summary tables for client role users.
// Shows device fleet at a glance: two tables split by possession status.
import { getCustomerAssets } from '../api/syncro.js';

// Lifecycle stages shown per table (only columns with data will render)
const IT_POSSESSION_STAGES  = ['Inventory', 'Pre-Deployment', 'For Repair', 'For Upgrade', 'For Parts', 'Decommissioned', 'Disposed of'];
const DEPLOYED_STAGES       = ['Active', 'For Repair', 'For Upgrade', 'Decommissioned', 'Disposed of'];

function getPossessionGroup(asset) {
  const p = asset.properties?.['Possession Status'];
  if (p === 'In IT Possession') return 'it';
  if (p === 'Deployed' || p === 'In User Possession') return 'deployed';
  return 'it'; // default unmapped assets to IT bucket
}

function getLifecycle(asset) {
  return asset.properties?.['Lifecycle Stage'] ?? 'Unknown';
}

function getDeviceType(asset) {
  return asset.asset_type || 'Other';
}

// Build a count matrix: { [deviceType]: { [lifecycleStage]: count } }
function buildMatrix(assets) {
  const matrix = {};
  for (const asset of assets) {
    const type  = getDeviceType(asset);
    const stage = getLifecycle(asset);
    if (!matrix[type]) matrix[type] = {};
    matrix[type][stage] = (matrix[type][stage] ?? 0) + 1;
  }
  return matrix;
}

// Only include columns that have at least one non-zero value
function activeColumns(matrix, stageCandidates) {
  return stageCandidates.filter(stage =>
    Object.values(matrix).some(row => (row[stage] ?? 0) > 0)
  );
}

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

function renderTable({ title, assets, stageOrder, possession, onFilterSelect }) {
  if (!assets.length) {
    return `<div class="qv-section"><h2>${esc(title)}</h2><p class="qv-empty">No devices in this group.</p></div>`;
  }

  const matrix  = buildMatrix(assets);
  const cols    = activeColumns(matrix, stageOrder);
  const types   = Object.keys(matrix).sort();

  // Column totals
  const colTotals = {};
  for (const col of cols) colTotals[col] = 0;
  for (const type of types) {
    for (const col of cols) {
      colTotals[col] += matrix[type][col] ?? 0;
    }
  }
  const grandTotal = Object.values(colTotals).reduce((a, b) => a + b, 0);

  const headerCells = cols.map(c => `<th>${esc(c)}</th>`).join('');
  const totalCells  = cols.map(c => {
    const n = colTotals[c];
    return `<td>${n > 0 ? n : '<span class="qv-cell-zero">—</span>'}</td>`;
  }).join('');

  const rows = types.map(type => {
    const rowTotal = cols.reduce((s, c) => s + (matrix[type][c] ?? 0), 0);
    const cells = cols.map(stage => {
      const n = matrix[type][stage] ?? 0;
      if (n === 0) return `<td><span class="qv-cell-zero">—</span></td>`;
      const payload = encodeURIComponent(JSON.stringify({ lifecycle: [stage], possession }));
      return `<td><span class="qv-cell-link" data-filter="${payload}">${n}</span></td>`;
    }).join('');
    return `<tr><td>${esc(type)}</td>${cells}<td>${rowTotal}</td></tr>`;
  }).join('');

  return `
<div class="qv-section">
  <div class="qv-card-header">
    <h2>${esc(title)}</h2>
    <span class="qv-card-count">${grandTotal} device${grandTotal !== 1 ? 's' : ''}</span>
  </div>
  <div class="qv-card-body">
    <table class="qv-table">
      <thead><tr><th>Device Type</th>${headerCells}<th>Total</th></tr></thead>
      <tbody>${rows}</tbody>
      <tfoot><tr><td>Total</td>${totalCells}<td>${grandTotal}</td></tr></tfoot>
    </table>
  </div>
</div>`;
}

export async function renderClientDashboard(container, user, { onFilterSelect } = {}) {
  container.innerHTML = '<div class="qv-loading">Loading…</div>';

  if (!user?.syncro_customer_id) {
    container.innerHTML = '<div class="qv-empty">No company assigned to your account. Contact your administrator.</div>';
    return;
  }

  let assets;
  try {
    assets = await getCustomerAssets(user.syncro_customer_id);
  } catch (err) {
    container.innerHTML = `<div class="qv-empty">Failed to load assets: ${esc(err.message)}</div>`;
    return;
  }

  const itAssets       = assets.filter(a => getPossessionGroup(a) === 'it');
  const deployedAssets = assets.filter(a => getPossessionGroup(a) === 'deployed');

  const html =
    renderTable({ title: 'In IT Possession', assets: itAssets,       stageOrder: IT_POSSESSION_STAGES, possession: 'IT',       onFilterSelect }) +
    renderTable({ title: 'Out in the Field',  assets: deployedAssets, stageOrder: DEPLOYED_STAGES,      possession: 'Deployed', onFilterSelect });

  container.innerHTML = html;

  // Wire up click-through filtering
  if (onFilterSelect) {
    container.querySelectorAll('.qv-cell-link').forEach(el => {
      el.addEventListener('click', () => {
        try {
          const { lifecycle, possession } = JSON.parse(decodeURIComponent(el.dataset.filter));
          onFilterSelect({ lifecycle, possession });
        } catch { /* ignore malformed data */ }
      });
    });
  }
}