/* ── AIMS Insight – Dashboard JS ── */

let donutChart = null;
let barChart   = null;

/* ───────────────────────────────
   FILTER RESET
─────────────────────────────── */
function resetFilters() {
  document.getElementById('startDate').value = '';
  document.getElementById('endDate').value = '';
  document.getElementById('filterTopic').value = 'all';
  document.getElementById('filterSentiment').value = 'all';

  setTimeout(() => {
    loadData();
  }, 50);
}

/* ───────────────────────────────
   LOAD DATA FROM API
─────────────────────────────── */
async function loadData() {
  const params = new URLSearchParams({
    start_date: document.getElementById('startDate').value,
    end_date:   document.getElementById('endDate').value,
    topic:      document.getElementById('filterTopic').value,
    sentiment:  document.getElementById('filterSentiment').value
  });

  try {
    const res  = await fetch(`/api/dashboard-data?${params}`);
    const data = await res.json();

    updateKPIs(data);
    updateDonut(data.sentiment);
    updateBar(data.topics);
    updateTable(data.recent);

  } catch (e) {
    console.error('Dashboard load error:', e);
  }
}

/* ───────────────────────────────
   KPI UPDATE
─────────────────────────────── */
function updateKPIs(data) {
  document.getElementById('kpiTotal').textContent        = data.total;
  document.getElementById('kpiSatisfaction').textContent = data.satisfaction + '%';
  document.getElementById('kpiNeutral').textContent      = data.sentiment.Neutral;
  document.getElementById('kpiNegative').textContent     = data.sentiment.Negative;
}

/* ───────────────────────────────
   DONUT CHART
─────────────────────────────── */
function updateDonut(sentiment) {
  const ctx = document.getElementById('donutChart').getContext('2d');

  const dataArr = [
    sentiment.Positive,
    sentiment.Neutral,
    sentiment.Negative
  ];

  if (donutChart) donutChart.destroy();

  donutChart = new Chart(ctx, {
    type: 'doughnut',
    data: {
      labels: ['Positive', 'Neutral', 'Negative'],
      datasets: [{
        data: dataArr,
        backgroundColor: ['#28a745', '#6c757d', '#dc3545'],
        borderWidth: 3,
        borderColor: '#fff',
        hoverOffset: 6
      }]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      cutout: '65%',
      plugins: {
        legend: {
          position: 'bottom',
          labels: { padding: 14, font: { size: 12 } }
        }
      }
    }
  });
}

/* ───────────────────────────────
   BAR CHART
─────────────────────────────── */
function updateBar(topics) {
  const ctx = document.getElementById('barChart').getContext('2d');

  const sorted = Object.entries(topics).sort((a, b) => b[1] - a[1]);
  const labels = sorted.map(([k]) => k);
  const values = sorted.map(([, v]) => v);

  const colors = values.map((_, i) => {
    const opacity = 1 - (i / Math.max(values.length, 1)) * 0.5;
    return `rgba(128,0,0,${opacity})`;
  });

  if (barChart) barChart.destroy();

  barChart = new Chart(ctx, {
    type: 'bar',
    data: {
      labels,
      datasets: [{
        label: 'Feedbacks',
        data: values,
        backgroundColor: colors,
        borderRadius: 6,
        borderSkipped: false
      }]
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      plugins: {
        legend: { display: false }
      },
      scales: {
        y: {
          beginAtZero: true,
          ticks: { stepSize: 1, font: { size: 11 } },
          grid: { color: 'rgba(0,0,0,.04)' }
        },
        x: {
          ticks: { font: { size: 11 } },
          grid: { display: false }
        }
      }
    }
  });
}

/* ───────────────────────────────
   TABLE UPDATE
─────────────────────────────── */
function updateTable(rows) {
  const tbody = document.getElementById('recentTable');

  if (!rows || rows.length === 0) {
    tbody.innerHTML = `
      <tr>
        <td colspan="4" style="text-align:center; color:#aaa; padding:30px">
          No data available for these filters.
        </td>
      </tr>`;
    return;
  }

  tbody.innerHTML = rows.map(r => {
    const label =
      r.sentiment_label === 'Positive' ? 'badge-positive'
      : r.sentiment_label === 'Negative' ? 'badge-negative'
      : 'badge-neutral';

    const labelFR =
      r.sentiment_label === 'Positive' ? 'Positive'
      : r.sentiment_label === 'Negative' ? 'Negative'
      : 'Neutral';

    const date = r.created_at ? r.created_at.slice(0, 16) : '—';

    const comment = (r.comment_text || '').length > 80
      ? r.comment_text.slice(0, 80) + '…'
      : r.comment_text;

    return `
      <tr>
        <td style="color:#888; font-size:12px; white-space:nowrap">${date}</td>
        <td>
          <span style="background:#f3f0ef; padding:3px 9px;
                       border-radius:6px; font-size:12px; font-weight:600; color:#555">
            ${r.topic}
          </span>
        </td>
        <td class="comment-cell">${comment}</td>
        <td><span class="badge ${label}">${labelFR}</span></td>
      </tr>`;
  }).join('');
}

/* ───────────────────────────────
   USER DROPDOWN MENU (PROFILE)
─────────────────────────────── */
function toggleUserMenu() {
  const menu = document.getElementById("userMenu");
  if (menu) menu.classList.toggle("show");
}

// close dropdown when clicking outside
document.addEventListener("click", function (e) {
  const badge = document.querySelector(".user-badge");
  const menu = document.getElementById("userMenu");

  if (!badge || !menu) return;

  if (!badge.contains(e.target)) {
    menu.classList.remove("show");
  }
});

/* ───────────────────────────────
   INIT
─────────────────────────────── */
document.addEventListener('DOMContentLoaded', loadData);