(function () {
  'use strict';

  var ID_RE = /^[A-Z]\d{6}$|^S\d{3,4}$/;

  var METRIC_LABELS = {
    total: 'Total Votes',
    yeas: 'Yeas',
    nays: 'Nays',
    participation_pct: 'Participation %',
    voted_with_gop: 'Voted With GOP',
    voted_with_gop_pct: 'Voted With GOP %',
    voted_with_dem: 'Voted With Dem',
    voted_with_dem_pct: 'Voted With Dem %',
    voted_against_gop: 'Voted Against GOP',
    voted_against_gop_pct: 'Voted Against GOP %',
    voted_against_dem: 'Voted Against Dem',
    voted_against_dem_pct: 'Voted Against Dem %',
    lone_wolf: 'Lone Wolf Votes',
    lone_wolf_pct: 'Lone Wolf %'
  };

  var state = {
    BASE: './data/',
    manifest: null,
    chamber: 'H',
    parties: { R: true, D: true, I: true },
    metric: 'total',
    order: 'desc'
  };
  var els = {};

  document.addEventListener('DOMContentLoaded', init);

  function init() {
    els.root = document.getElementById('polisci-root');
    state.BASE = els.root.dataset.base || './data/';
    els.tbody = document.querySelector('#rank-table tbody');
    els.thead = document.querySelector('#rank-table thead');
    els.metricHeader = document.getElementById('rank-metric-header');
    els.summary = document.getElementById('rank-summary');
    els.metricSelect = document.getElementById('rank-metric');
    els.lastGenerated = document.getElementById('last-generated');

    var inline = document.getElementById('polisci-manifest');
    if (inline && inline.textContent) {
      try { onManifest(JSON.parse(inline.textContent)); return; }
      catch (e) { /* fall through */ }
    }
    fetch(state.BASE + 'manifest.json', { credentials: 'omit' })
      .then(function (r) { if (!r.ok) throw new Error('HTTP ' + r.status); return r.json(); })
      .then(onManifest)
      .catch(function (e) { showFatal('Failed to load manifest: ' + e.message + ' — if you opened this file directly, serve it over HTTP.'); });
  }

  function showFatal(msg) {
    els.root.replaceChildren();
    var p = document.createElement('p');
    p.style.padding = '20px';
    p.style.color = '#c0392b';
    p.textContent = msg;
    els.root.appendChild(p);
  }

  function onManifest(m) {
    state.manifest = m;
    if (els.lastGenerated) els.lastGenerated.textContent = m.generated_at || '';

    var chamberInputs = document.querySelectorAll('input[name="chamber"]');
    for (var i = 0; i < chamberInputs.length; i++) {
      chamberInputs[i].addEventListener('change', onChamberChange);
    }
    var partyInputs = document.querySelectorAll('input[name="party"]');
    for (var j = 0; j < partyInputs.length; j++) {
      partyInputs[j].addEventListener('change', onPartyChange);
    }
    els.metricSelect.addEventListener('change', function () {
      state.metric = els.metricSelect.value;
      syncURL();
      render();
    });
    var orderInputs = document.querySelectorAll('input[name="order"]');
    for (var k = 0; k < orderInputs.length; k++) {
      orderInputs[k].addEventListener('change', onOrderChange);
    }
    document.getElementById('rank-reset').addEventListener('click', resetControls);

    var toggle = document.getElementById('sidebar-toggle');
    if (toggle) toggle.addEventListener('click', function () {
      var body = document.getElementById('sidebar-body');
      var open = body.classList.toggle('is-collapsed') ? 'false' : 'true';
      toggle.setAttribute('aria-expanded', open);
    });

    window.addEventListener('popstate', function () { restoreFromURL(); render(); });
    restoreFromURL();
    render();
  }

  function onChamberChange(e) {
    state.chamber = e.target.value === 'S' ? 'S' : 'H';
    syncURL();
    render();
  }
  function onPartyChange(e) {
    state.parties[e.target.value] = e.target.checked;
    syncURL();
    render();
  }
  function onOrderChange(e) {
    state.order = e.target.value === 'asc' ? 'asc' : 'desc';
    syncURL();
    render();
  }

  function resetControls() {
    state.chamber = 'H';
    state.parties = { R: true, D: true, I: true };
    state.metric = 'total';
    state.order = 'desc';
    document.querySelector('input[name="chamber"][value="H"]').checked = true;
    document.querySelector('input[name="party"][value="R"]').checked = true;
    document.querySelector('input[name="party"][value="D"]').checked = true;
    document.querySelector('input[name="party"][value="I"]').checked = true;
    els.metricSelect.value = 'total';
    document.querySelector('input[name="order"][value="desc"]').checked = true;
    syncURL();
    render();
  }

  function computeMetric(k, key) {
    var voting = k.voting || 0;
    switch (key) {
      case 'total': return k.total || 0;
      case 'yeas': return k.yeas || 0;
      case 'nays': return k.nays || 0;
      case 'participation_pct': return k.total ? (100 * voting / k.total) : null;
      case 'voted_with_gop': return k.voted_with_gop || 0;
      case 'voted_with_gop_pct': return voting ? (100 * (k.voted_with_gop || 0) / voting) : null;
      case 'voted_with_dem': return k.voted_with_dem || 0;
      case 'voted_with_dem_pct': return voting ? (100 * (k.voted_with_dem || 0) / voting) : null;
      case 'voted_against_gop': return k.voted_against_gop || 0;
      case 'voted_against_gop_pct': return voting ? (100 * (k.voted_against_gop || 0) / voting) : null;
      case 'voted_against_dem': return k.voted_against_dem || 0;
      case 'voted_against_dem_pct': return voting ? (100 * (k.voted_against_dem || 0) / voting) : null;
      case 'lone_wolf': return k.lone_wolf || 0;
      case 'lone_wolf_pct': return voting ? (100 * (k.lone_wolf || 0) / voting) : null;
    }
    return null;
  }

  function isPct(key) { return /_pct$/.test(key); }

  function render() {
    var members = (state.manifest && state.manifest.members) || [];
    var rows = [];
    for (var i = 0; i < members.length; i++) {
      var m = members[i];
      if (m.c !== state.chamber) continue;
      if (!state.parties[m.p]) continue;
      if (!m.k) continue;
      var v = computeMetric(m.k, state.metric);
      if (v === null) continue;
      rows.push({ m: m, v: v });
    }

    rows.sort(function (a, b) {
      if (a.v === b.v) return (a.m.n || '').localeCompare(b.m.n || '');
      return state.order === 'asc' ? a.v - b.v : b.v - a.v;
    });

    var label = METRIC_LABELS[state.metric] || state.metric;
    els.metricHeader.textContent = label;

    els.summary.replaceChildren();
    var p = document.createElement('p');
    p.className = 'rank-summary-line';
    var chamberName = state.chamber === 'H' ? 'House' : 'Senate';
    var partyList = ['R', 'D', 'I'].filter(function (x) { return state.parties[x]; }).join('/') || 'none';
    p.textContent = rows.length + ' ' + chamberName + ' members (' + partyList + ') ranked by ' + label
      + ' (' + (state.order === 'desc' ? 'highest first' : 'lowest first') + ')';
    els.summary.appendChild(p);

    els.tbody.replaceChildren();
    var pct = isPct(state.metric);
    for (var r = 0; r < rows.length; r++) {
      var row = rows[r];
      var tr = document.createElement('tr');
      tr.className = 'rank-row';
      tr.tabIndex = 0;
      tr.dataset.id = row.m.id;
      tr.addEventListener('click', openMember);
      tr.addEventListener('keydown', function (e) {
        if (e.key === 'Enter') openMember.call(e.currentTarget, e);
      });

      var rank = document.createElement('td');
      rank.textContent = String(r + 1);
      tr.appendChild(rank);

      var name = document.createElement('td');
      name.textContent = row.m.n || row.m.id;
      tr.appendChild(name);

      var party = document.createElement('td');
      party.textContent = row.m.p || '';
      party.className = 'party-cell party-' + (row.m.p || 'X');
      tr.appendChild(party);

      var st = document.createElement('td');
      st.textContent = row.m.s || '';
      tr.appendChild(st);

      var val = document.createElement('td');
      val.className = 'rank-value';
      val.textContent = pct ? row.v.toFixed(1) + '%' : String(row.v);
      tr.appendChild(val);

      els.tbody.appendChild(tr);
    }
  }

  function openMember(e) {
    var tr = e.currentTarget;
    var id = tr.dataset.id;
    if (!id || !ID_RE.test(id)) return;
    window.open('app.html?id=' + encodeURIComponent(id), '_blank', 'noopener');
  }

  function syncURL() {
    var params = new URLSearchParams();
    if (state.chamber !== 'H') params.set('c', state.chamber);
    if (state.metric !== 'total') params.set('m', state.metric);
    if (state.order !== 'desc') params.set('o', state.order);
    var pset = ['R', 'D', 'I'].filter(function (x) { return state.parties[x]; });
    if (pset.length !== 3) params.set('p', pset.join(''));
    var q = params.toString();
    var url = q ? ('?' + q) : location.pathname;
    history.replaceState(null, '', url);
  }

  function restoreFromURL() {
    var params = new URLSearchParams(location.search);
    var c = params.get('c');
    if (c === 'S' || c === 'H') state.chamber = c;
    var m = params.get('m');
    if (m && METRIC_LABELS[m]) state.metric = m;
    var o = params.get('o');
    if (o === 'asc' || o === 'desc') state.order = o;
    var p = params.get('p');
    if (p) {
      state.parties = { R: false, D: false, I: false };
      for (var i = 0; i < p.length; i++) {
        var ch = p.charAt(i);
        if (ch === 'R' || ch === 'D' || ch === 'I') state.parties[ch] = true;
      }
    }
    // Reflect in controls
    var ci = document.querySelector('input[name="chamber"][value="' + state.chamber + '"]');
    if (ci) ci.checked = true;
    var pInputs = document.querySelectorAll('input[name="party"]');
    for (var j = 0; j < pInputs.length; j++) {
      pInputs[j].checked = !!state.parties[pInputs[j].value];
    }
    els.metricSelect.value = state.metric;
    var oi = document.querySelector('input[name="order"][value="' + state.order + '"]');
    if (oi) oi.checked = true;
  }
})();