// ─── DATA ───────────────────────────────────────────────────
let ALL_DATA = [];
let filteredData = [];
let sortKey = 'date';
let sortDir = -1; // -1 = desc
let currentPage = 1;
const PAGE_SIZE = 50;
let logUnavailable = false;

// ─── FULL LOG ────────────────────────────────────────────────
const FULL_LOG_URL = 'data/k5bss-log.json';

async function loadFullLog() {
  try {
    const res = await fetch(FULL_LOG_URL);
    if (!res.ok) throw new Error(`HTTP ${res.status}`);
    return await res.json();
  } catch (err) {
    console.warn('Could not load full log:', err);
    return null;
  }
}

async function init() {
  const log = await loadFullLog();
  logUnavailable = !log;
  ALL_DATA = log || [];
  filteredData = [...ALL_DATA];

  if (logUnavailable) {
    document.getElementById('log-error').hidden = false;
    renderTable();
    return;
  }

  // Update stats
  const countries = new Set(ALL_DATA.map(r => r.country).filter(Boolean));
  const states = new Set(ALL_DATA.filter(r => r.country === 'United States').map(r => r.state).filter(Boolean));
  document.getElementById('stat-qso').textContent = ALL_DATA.length.toLocaleString();
  document.getElementById('stat-dxcc').textContent = countries.size;
  document.getElementById('stat-states').textContent = states.size;

  buildDashboard();
  populateFilters();
  renderTable();
}

// ─── DASHBOARD ───────────────────────────────────────────────
function buildDashboard() {
  // Modes
  const modes = countBy(ALL_DATA, 'mode');
  const topModes = Object.entries(modes).sort((a,b)=>b[1]-a[1]).slice(0,7);
  const maxMode = topModes[0][1];
  const modesEl = document.getElementById('modes-chart');
  const modeColors = { FT8:'#ffaa00', FT4:'#ffcc44', DIG:'#ff8800', USB:'#4499ff', LSB:'#66aaff', SSB:'#88bbff', RTTY:'#ff4455' };
  modesEl.innerHTML = topModes.map(([m, c]) => `
    <div class="bar-row">
      <div class="bar-label">${m}</div>
      <div class="bar-track"><div class="bar-fill" style="width:0%;background:${modeColors[m]||'#888'}" data-target="${(c/maxMode*100).toFixed(1)}"></div></div>
      <div class="bar-count">${c}</div>
    </div>`).join('');

  // Bands
  const bands = countBy(ALL_DATA, 'band');
  const topBands = Object.entries(bands).sort((a,b)=>b[1]-a[1]).slice(0,8);
  const maxBand = topBands[0][1];
  const bandEl = document.getElementById('bands-chart');
  const bandColors = { '20M':'#4499ff','40M':'#00ff88','80M':'#ff4455','10M':'#00ddff','30M':'#88aaff','17M':'#aaddff','15M':'#ffaaff','12M':'#ffdd88' };
  bandEl.innerHTML = topBands.map(([b, c]) => `
    <div class="bar-row">
      <div class="bar-label">${b}</div>
      <div class="bar-track"><div class="bar-fill" style="width:0%;background:${bandColors[b]||'#888'}" data-target="${(c/maxBand*100).toFixed(1)}"></div></div>
      <div class="bar-count">${c}</div>
    </div>`).join('');

  // Countries
  const countries = countBy(ALL_DATA, 'country');
  const topCountries = Object.entries(countries).sort((a,b)=>b[1]-a[1]).slice(0,20);
  const ctEl = document.getElementById('countries-list');
  ctEl.innerHTML = topCountries.map(([c,n]) => `
    <div class="country-row">
      <span class="country-name">${c||'Unknown'}</span>
      <span class="country-count">${n}</span>
    </div>`).join('');

  // Animate bars after a tick
  requestAnimationFrame(() => {
    setTimeout(() => {
      document.querySelectorAll('.bar-fill').forEach(el => {
        el.style.width = el.dataset.target + '%';
      });
    }, 100);
  });

  // Activity chart
  drawActivityChart();
}

function drawActivityChart() {
  if (!ALL_DATA.length) return;
  const canvas = document.getElementById('activityCanvas');
  const dpr = window.devicePixelRatio || 1;
  const W = canvas.parentElement.offsetWidth - 48;
  const H = 120;
  canvas.width = W * dpr;
  canvas.height = H * dpr;
  canvas.style.width = W + 'px';
  canvas.style.height = H + 'px';
  const ctx = canvas.getContext('2d');
  ctx.scale(dpr, dpr);

  // Group by year-month
  const monthly = {};
  ALL_DATA.forEach(r => {
    if (!r.date) return;
    const key = r.date.slice(0,7);
    monthly[key] = (monthly[key]||0) + 1;
  });
  const keys = Object.keys(monthly).sort();
  const vals = keys.map(k => monthly[k]);
  const max = Math.max(...vals);

  const pad = { l: 10, r: 10, t: 15, b: 30 };
  const chartW = W - pad.l - pad.r;
  const chartH = H - pad.t - pad.b;
  const barW = Math.max(2, (chartW / keys.length) - 1);

  ctx.clearRect(0,0,W,H);

  // Grid line
  ctx.strokeStyle = 'rgba(30,37,48,0.8)';
  ctx.lineWidth = 1;
  ctx.beginPath();
  ctx.moveTo(pad.l, pad.t + chartH);
  ctx.lineTo(W - pad.r, pad.t + chartH);
  ctx.stroke();

  // Bars
  keys.forEach((k, i) => {
    const x = pad.l + i * (chartW / keys.length);
    const h = (vals[i] / max) * chartH;
    const y = pad.t + chartH - h;
    const grad = ctx.createLinearGradient(0, y, 0, y + h);
    grad.addColorStop(0, 'rgba(0,255,136,0.9)');
    grad.addColorStop(1, 'rgba(0,255,136,0.15)');
    ctx.fillStyle = grad;
    ctx.fillRect(x, y, barW, h);
  });

  // X labels (every 6 months)
  ctx.fillStyle = 'rgba(90,112,128,0.9)';
  ctx.font = `${9 * dpr / dpr}px 'Share Tech Mono', monospace`;
  ctx.textAlign = 'center';
  keys.forEach((k, i) => {
    if (i % 6 === 0) {
      const x = pad.l + i * (chartW / keys.length) + barW/2;
      ctx.fillText(k, x, H - 8);
    }
  });
}

// ─── TABLE ───────────────────────────────────────────────────
function populateFilters() {
  const bands = [...new Set(ALL_DATA.map(r=>r.band).filter(Boolean))].sort();
  const modes = [...new Set(ALL_DATA.map(r=>r.mode).filter(Boolean))].sort();
  const bandSel = document.getElementById('filter-band');
  const modeSel = document.getElementById('filter-mode');
  bands.forEach(b => { const o = document.createElement('option'); o.value=b; o.text=b; bandSel.appendChild(o); });
  modes.forEach(m => { const o = document.createElement('option'); o.value=m; o.text=m; modeSel.appendChild(o); });
}

function applyFilters() {
  const q = document.getElementById('search-input').value.trim().toLowerCase();
  const band = document.getElementById('filter-band').value;
  const mode = document.getElementById('filter-mode').value;
  const lotw = document.getElementById('filter-lotw').value;

  filteredData = ALL_DATA.filter(r => {
    if (band && r.band !== band) return false;
    if (mode && r.mode !== mode) return false;
    if (lotw && r.lotw !== lotw) return false;
    if (q) {
      const hay = [r.call, r.name, r.country, r.qth, r.state, r.grid].join(' ').toLowerCase();
      if (!hay.includes(q)) return false;
    }
    return true;
  });

  currentPage = 1;
  renderTable();
}

function sortTable(key) {
  if (sortKey === key) sortDir *= -1;
  else { sortKey = key; sortDir = key === 'date' || key === 'time' ? -1 : 1; }

  filteredData.sort((a,b) => {
    let av = a[key]||'', bv = b[key]||'';
    if (key === 'dist') { av = parseInt(av)||0; bv = parseInt(bv)||0; }
    if (av < bv) return -sortDir;
    if (av > bv) return sortDir;
    return 0;
  });

  // Update header indicators
  document.querySelectorAll('thead th').forEach(th => {
    th.classList.remove('sort-asc','sort-desc');
  });
  const headers = ['call','name','date','time','band','mode','rst_sent','country','dist','lotw'];
  const idx = headers.indexOf(key);
  if (idx >= 0) {
    const ths = document.querySelectorAll('thead th');
    ths[idx].classList.add(sortDir === 1 ? 'sort-asc' : 'sort-desc');
  }

  renderTable();
}

function renderTable() {
  const tbody = document.getElementById('log-tbody');
  const total = filteredData.length;
  const pages = Math.ceil(total / PAGE_SIZE);
  const start = (currentPage - 1) * PAGE_SIZE;
  const slice = filteredData.slice(start, start + PAGE_SIZE);

  document.getElementById('log-meta').textContent =
    `${total.toLocaleString()} QSOs · Page ${currentPage} of ${Math.max(1,pages)}`;

  if (slice.length === 0) {
    const msg = logUnavailable ? 'LOG UNAVAILABLE — TRY AGAIN LATER' : 'NO CONTACTS FOUND';
    tbody.innerHTML = `<tr><td colspan="10" style="text-align:center;padding:2rem;color:var(--muted);font-family:var(--font-mono);font-size:0.8rem;">${msg}</td></tr>`;
  } else {
    tbody.innerHTML = slice.map(r => {
      const timeStr = r.time ? r.time.slice(0,2)+':'+r.time.slice(2,4) : '';
      const bandClass = `band-${r.band}`;
      const lotwClass = r.lotw === 'Y' ? 'lotw-y' : 'lotw-n';
      const lotwSym = r.lotw === 'Y' ? '✓' : '·';
      const rst = r.rst_sent && r.rst_rcvd ? `${r.rst_sent} / ${r.rst_rcvd}` : r.rst_sent || '';
      return `<tr>
        <td class="call-cell">${esc(r.call)}</td>
        <td>${esc(r.name ? titleCase(r.name) : '')}</td>
        <td>${esc(r.date)}</td>
        <td>${timeStr}Z</td>
        <td><span class="band-badge ${bandClass}">${esc(r.band)}</span></td>
        <td class="mode-cell">${esc(r.mode)}</td>
        <td class="rst-cell">${esc(rst)}</td>
        <td>${esc(r.country||'')}${r.state ? ' <span style="color:var(--muted)">'+esc(r.state)+'</span>' : ''}</td>
        <td class="dist-cell">${r.dist ? Number(r.dist).toLocaleString() : ''}</td>
        <td class="${lotwClass}" style="text-align:center">${lotwSym}</td>
      </tr>`;
    }).join('');
  }

  renderPagination(pages);
}

function renderPagination(pages) {
  const el = document.getElementById('pagination');
  if (pages <= 1) { el.innerHTML = ''; return; }

  let html = `<button class="page-btn" onclick="goPage(${currentPage-1})" ${currentPage===1?'disabled':''}>‹ Prev</button>`;

  const range = [];
  if (pages <= 7) {
    for (let i=1;i<=pages;i++) range.push(i);
  } else {
    range.push(1);
    if (currentPage > 3) range.push('...');
    for (let i=Math.max(2,currentPage-1); i<=Math.min(pages-1,currentPage+1); i++) range.push(i);
    if (currentPage < pages-2) range.push('...');
    range.push(pages);
  }

  range.forEach(p => {
    if (p === '...') html += `<span class="page-info">…</span>`;
    else html += `<button class="page-btn ${p===currentPage?'active':''}" onclick="goPage(${p})">${p}</button>`;
  });

  html += `<button class="page-btn" onclick="goPage(${currentPage+1})" ${currentPage===pages?'disabled':''}>Next ›</button>`;
  el.innerHTML = html;
}

function goPage(p) {
  currentPage = p;
  renderTable();
  document.querySelector('.table-wrap').scrollIntoView({behavior:'smooth',block:'nearest'});
}

// ─── HELPERS ─────────────────────────────────────────────────
function countBy(arr, key) {
  return arr.reduce((acc, r) => {
    const v = r[key];
    if (v) acc[v] = (acc[v]||0)+1;
    return acc;
  }, {});
}

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

function titleCase(s) {
  return s.toLowerCase().replace(/\b\w/g, c => c.toUpperCase());
}

function showSection(id, btn) {
  document.querySelectorAll('.section').forEach(s => s.classList.remove('active'));
  document.querySelectorAll('.nav-btn').forEach(b => b.classList.remove('active'));
  document.getElementById('section-' + id).classList.add('active');
  btn.classList.add('active');
}

window.addEventListener('load', init);
window.addEventListener('resize', () => {
  if (document.getElementById('section-dashboard').classList.contains('active')) {
    drawActivityChart();
  }
});