(function () {
  'use strict';

  // Security: validate any member id before fetch / DOM use.
  var ID_RE = /^[A-Z]\d{6}$|^S\d{3,4}$/;
  var LS_KEY = 'polisci:v119:lastMember';
  var COLORS = {
    R: '#d9534f', D: '#337ab7', I: '#5cb85c',
    helpedR: '#d9534f', helpedD: '#337ab7',
    helpedBoth: '#8e44ad', helpedNeither: '#7f8c8d',
    green: '#27ae60', red: '#c0392b'
  };
  var ALIGN_KEYS = ['Helped Republicans', 'Helped Democrats', 'Helped Both', 'Helped Neither'];
  var ALIGN_COLORS = [COLORS.helpedR, COLORS.helpedD, COLORS.helpedBoth, COLORS.helpedNeither];

  var state = {
    manifest: null,
    membersById: {},          // id -> manifest entry
    BASE: './data/',
    currentId: null,
    currentMember: null,
    sortCol: null,
    sortAsc: true,
    selectedStates: null,     // null => all
    skipPush: false,
    urlReplaceTimer: 0
  };

  var els = {};
  var charts = {};

  document.addEventListener('DOMContentLoaded', init);

  function init() {
    var root = document.getElementById('polisci-root');
    if (!root) return;
    state.BASE = root.dataset.base || './data/';

    els.root = root;
    els.note = document.getElementById('member-note');
    els.summary = document.getElementById('member-summary');
    els.kpis = document.getElementById('kpi-cards');
    els.search = document.getElementById('member-search');
    els.results = document.getElementById('member-results');
    els.lastGen = document.getElementById('last-generated');
    els.filterChamber = document.getElementById('filter-chamber');
    els.filterParty = document.getElementById('filter-party');
    els.filterState = document.getElementById('filter-state-select');
    els.filterReset = document.getElementById('filter-reset');
    els.sidebarToggle = document.getElementById('sidebar-toggle');
    els.sidebar = document.getElementById('sidebar');
    els.tableBody = document.querySelector('#vote-table tbody');
    els.tableHead = document.querySelector('#vote-table thead');

    var inline = document.getElementById('polisci-manifest');
    if (inline && inline.textContent) {
      try { onManifest(JSON.parse(inline.textContent)); return; }
      catch (e) { /* fall through to fetch */ }
    }
    var url = state.BASE + 'manifest.json';
    fetch(url, { 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 (e.g., `cd results/119 && python3 -m http.server`).'); });
  }

  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;
    var members = m.members || [];
    for (var i = 0; i < members.length; i++) {
      state.membersById[members[i].id] = members[i];
    }
    els.lastGen.textContent = m.generated_at || '';

    populateStateOptions(members);
    wireEvents();
    buildCharts();
    initSortHeaders();
    restoreFiltersFromURL();
    initialSelect();
    window.addEventListener('popstate', onPopState);
  }

  function populateStateOptions(members) {
    var states = {};
    for (var i = 0; i < members.length; i++) states[members[i].s] = true;
    var keys = Object.keys(states).sort();
    els.filterState.replaceChildren();
    for (var j = 0; j < keys.length; j++) {
      var opt = document.createElement('option');
      opt.value = keys[j];
      opt.textContent = keys[j];
      opt.selected = true;
      els.filterState.appendChild(opt);
    }
  }

  function wireEvents() {
    var chamberInputs = els.filterChamber.querySelectorAll('input[type=checkbox]');
    var partyInputs = els.filterParty.querySelectorAll('input[type=checkbox]');
    chamberInputs.forEach(function (i) { i.addEventListener('change', onFilterChange); });
    partyInputs.forEach(function (i) { i.addEventListener('change', onFilterChange); });
    els.filterState.addEventListener('change', onFilterChange);
    els.filterReset.addEventListener('click', resetFilters);

    els.search.addEventListener('input', onFilterChange);
    els.search.addEventListener('focus', refreshFilter);
    document.addEventListener('click', function (e) {
      if (!els.results.contains(e.target) && e.target !== els.search) {
        els.results.classList.add('is-hidden');
        els.search.setAttribute('aria-expanded', 'false');
      }
    });

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

  function onFilterChange() {
    refreshFilter();
    debounceUrlReplace();
  }

  function resetFilters() {
    var inputs = els.filterChamber.querySelectorAll('input[type=checkbox]');
    inputs.forEach(function (i) { i.checked = true; });
    inputs = els.filterParty.querySelectorAll('input[type=checkbox]');
    inputs.forEach(function (i) { i.checked = true; });
    for (var j = 0; j < els.filterState.options.length; j++) {
      els.filterState.options[j].selected = true;
    }
    els.search.value = '';
    refreshFilter();
    debounceUrlReplace();
  }

  function getCheckedValues(group) {
    var out = [];
    var inputs = group.querySelectorAll('input[type=checkbox]:checked');
    inputs.forEach(function (i) { out.push(i.value); });
    return out;
  }

  function getSelectedStates() {
    var out = [];
    for (var i = 0; i < els.filterState.options.length; i++) {
      if (els.filterState.options[i].selected) out.push(els.filterState.options[i].value);
    }
    return out;
  }

  function initialsOf(name) {
    var parts = name.split(/\s+/);
    var out = '';
    for (var i = 0; i < parts.length; i++) {
      if (parts[i]) out += parts[i].charAt(0).toUpperCase();
    }
    return out;
  }

  function refreshFilter() {
    var chambers = getCheckedValues(els.filterChamber);
    var parties = getCheckedValues(els.filterParty);
    var states = getSelectedStates();
    var q = (els.search.value || '').trim();
    var qLower = q.toLowerCase();
    var qUpper = q.toUpperCase();
    var initialsMode = q.length > 0 && q.length <= 4 && /^[A-Za-z]+$/.test(q);

    var members = state.manifest.members;
    var matches = [];
    for (var i = 0; i < members.length && matches.length < 50; i++) {
      var m = members[i];
      if (chambers.indexOf(m.c) < 0) continue;
      if (parties.indexOf(m.p) < 0) continue;
      if (states.indexOf(m.s) < 0) continue;
      if (q) {
        var nameLower = m.n.toLowerCase();
        var hit = nameLower.indexOf(qLower) >= 0;
        if (!hit && initialsMode) {
          if (initialsOf(m.n) === qUpper) hit = true;
        }
        if (!hit) continue;
      }
      matches.push(m);
    }

    matches.sort(function (a, b) { return a.n.localeCompare(b.n); });
    renderResults(matches, q);
  }

  function renderResults(matches, q) {
    els.results.replaceChildren();
    if (!q && matches.length === state.manifest.members.length) {
      els.results.classList.add('is-hidden');
      els.search.setAttribute('aria-expanded', 'false');
      return;
    }
    if (!matches.length) {
      var li0 = document.createElement('li');
      li0.textContent = 'No members match.';
      li0.setAttribute('aria-disabled', 'true');
      els.results.appendChild(li0);
    } else {
      for (var i = 0; i < matches.length; i++) {
        var m = matches[i];
        var li = document.createElement('li');
        li.setAttribute('role', 'option');
        li.setAttribute('data-id', m.id);
        li.textContent = m.n + ' (' + m.p + '-' + m.s + ', ' + (m.c === 'H' ? 'House' : 'Senate') + ')';
        li.addEventListener('click', onResultClick);
        els.results.appendChild(li);
      }
    }
    els.results.classList.remove('is-hidden');
    els.search.setAttribute('aria-expanded', 'true');
  }

  function onResultClick(e) {
    var id = e.currentTarget.getAttribute('data-id');
    if (!isValidId(id)) return;
    els.results.classList.add('is-hidden');
    els.search.setAttribute('aria-expanded', 'false');
    selectMember(id);
  }

  function isValidId(id) {
    return typeof id === 'string' && ID_RE.test(id) && Object.prototype.hasOwnProperty.call(state.membersById, id);
  }

  function selectMember(id) {
    if (!isValidId(id)) return;
    var version = state.manifest.version || '';
    var url = state.BASE + 'members/' + encodeURIComponent(id) + '.json?v=' + encodeURIComponent(version);
    fetch(url, { credentials: 'omit' })
      .then(function (r) { if (!r.ok) throw new Error('HTTP ' + r.status); return r.json(); })
      .then(function (member) {
        state.currentId = id;
        state.currentMember = member;
        renderMember(member);
        try { localStorage.setItem(LS_KEY, id); } catch (_) {}
        if (!state.skipPush) {
          var u = buildShareUrl(id);
          history.pushState({ id: id }, '', u);
        }
        state.skipPush = false;
        document.title = member.name + ' — 119th Congress Voting Dashboard';
      })
      .catch(function (e) { showError('Failed to load member ' + id + ': ' + e.message); });
  }

  function showError(msg) {
    els.summary.replaceChildren();
    var p = document.createElement('p');
    p.style.color = '#c0392b';
    p.textContent = msg;
    els.summary.appendChild(p);
  }

  function renderMember(member) {
    renderSummary(member);
    renderNote(member);
    renderKPIs(member);
    updateCharts(member);
    renderTable(member.metrics.rows || []);
  }

  function renderSummary(m) {
    els.summary.replaceChildren();
    var h = document.createElement('h2');
    h.textContent = m.name;
    h.style.margin = '0 0 6px';
    els.summary.appendChild(h);
    var sub = document.createElement('div');
    sub.style.color = 'var(--ps-text-muted)';
    sub.style.fontSize = '0.92rem';
    var chamberLabel = m.chamber === 'house' ? 'House' : 'Senate';
    var distSuffix = (m.district && m.chamber === 'house') ? '-' + m.district : '';
    var endDate = m.served_to || 'present';
    sub.textContent = chamberLabel + ' · ' + m.party + '-' + m.state + distSuffix +
      ' · served ' + (m.served_from || '?') + ' – ' + endDate;
    els.summary.appendChild(sub);
  }

  var TERRITORY_NAMES = {
    AS: 'American Samoa', DC: 'the District of Columbia', GU: 'Guam',
    MP: 'the Northern Mariana Islands', PR: 'Puerto Rico', VI: 'the U.S. Virgin Islands'
  };

  function renderNote(m) {
    var partial = m.served_partial === true;
    var noVotes = !m.metrics || m.metrics.total === 0;
    var isDelegate = m.is_delegate === true;
    if (isDelegate) {
      var terr = TERRITORY_NAMES[m.state] || m.state;
      els.note.textContent = 'Note: This member is the non-voting delegate from ' + terr +
        '. House delegates may vote in committees and on amendments in the Committee of the Whole, ' +
        'but cannot vote on final passage on the House floor. Their low participation rate is structural, not absenteeism.';
      els.note.classList.remove('is-hidden');
    } else if (partial || noVotes) {
      var endDate = m.served_to || 'present';
      els.note.textContent = 'This member did not cast roll-call votes during the period analyzed (served ' +
        (m.served_from || '?') + ' – ' + endDate + '). The dashboards below reflect that absence.';
      els.note.classList.remove('is-hidden');
    } else {
      els.note.textContent = '';
      els.note.classList.add('is-hidden');
    }
  }

  function pct(n, d) {
    if (!d) return '0%';
    return ((n / d) * 100).toFixed(1) + '%';
  }

  function renderKPIs(m) {
    var x = m.metrics || {};
    var voting = x.voting || 0;
    var kpis = [
      ['Total Votes', String(x.total || 0)],
      ['Yea / Nay', (x.yeas || 0) + ' / ' + (x.nays || 0)],
      ['Participation', pct(voting, x.total || 0)],
      ['Voted With GOP', (x.voted_with_gop || 0) + ' (' + pct(x.voted_with_gop || 0, voting) + ')'],
      ['Voted With Dem', (x.voted_with_dem || 0) + ' (' + pct(x.voted_with_dem || 0, voting) + ')'],
      ['Voted Against GOP', (x.voted_against_gop || 0) + ' (' + pct(x.voted_against_gop || 0, voting) + ')'],
      ['Voted Against Dem', (x.voted_against_dem || 0) + ' (' + pct(x.voted_against_dem || 0, voting) + ')'],
      ['Lone Wolf Votes', String(x.lone_wolf || 0)]
    ];
    var cards = els.kpis.querySelectorAll('.kpi-card');
    for (var i = 0; i < cards.length; i++) {
      var label = cards[i].querySelector('.kpi-label');
      var value = cards[i].querySelector('.kpi-value');
      if (i < kpis.length) {
        label.textContent = kpis[i][0];
        value.textContent = kpis[i][1];
      } else {
        label.textContent = '';
        value.textContent = '';
      }
    }
  }

  function buildCharts() {
    if (typeof Chart === 'undefined') return;
    var common = { responsive: true, maintainAspectRatio: false };

    charts.voteDist = new Chart(document.getElementById('chart-vote-dist'), {
      type: 'bar',
      data: { labels: [], datasets: [{ label: 'Member vote', data: [], backgroundColor: ['#27ae60', '#c0392b', '#f39c12', '#7f8c8d'] }] },
      options: Object.assign({}, common, { plugins: { legend: { display: false } }, scales: { y: { beginAtZero: true } } })
    });

    charts.alignment = new Chart(document.getElementById('chart-alignment'), {
      type: 'doughnut',
      data: { labels: ALIGN_KEYS.slice(), datasets: [{ data: [0, 0, 0, 0], backgroundColor: ALIGN_COLORS.slice() }] },
      options: Object.assign({}, common, {
        plugins: {
          legend: { position: 'bottom' },
          tooltip: {
            callbacks: {
              label: function (ctx) {
                var dataArr = ctx.dataset.data || [];
                var sum = 0;
                for (var i = 0; i < dataArr.length; i++) sum += Number(dataArr[i]) || 0;
                var v = Number(ctx.parsed) || 0;
                var p = sum > 0 ? ((v / sum) * 100).toFixed(1) + '%' : '0%';
                return String(ctx.label) + ': ' + v + ' (' + p + ')';
              }
            }
          }
        }
      })
    });

    charts.blocked = new Chart(document.getElementById('chart-blocked'), {
      type: 'bar',
      data: {
        labels: ['Dem-Backed', 'GOP-Backed'],
        datasets: [{ label: 'Blocked', data: [0, 0], backgroundColor: [COLORS.helpedD, COLORS.helpedR] }]
      },
      options: Object.assign({}, common, { indexAxis: 'y', plugins: { legend: { display: false } }, scales: { x: { beginAtZero: true } } })
    });

    charts.alignmentTime = new Chart(document.getElementById('chart-alignment-time'), {
      type: 'line',
      data: {
        labels: [],
        datasets: ALIGN_KEYS.map(function (k, i) {
          return {
            label: k, data: [], borderColor: ALIGN_COLORS[i], backgroundColor: ALIGN_COLORS[i],
            tension: 0.2, fill: false
          };
        })
      },
      options: Object.assign({}, common, { plugins: { legend: { position: 'bottom' } }, scales: { y: { beginAtZero: true } } })
    });

    charts.withAgainst = new Chart(document.getElementById('chart-with-against'), {
      type: 'bar',
      data: {
        labels: ['GOP majority', 'Dem majority'],
        datasets: [
          { label: 'Voted With', data: [0, 0], backgroundColor: COLORS.green },
          { label: 'Voted Against', data: [0, 0], backgroundColor: COLORS.red }
        ]
      },
      options: Object.assign({}, common, { plugins: { legend: { position: 'bottom' } }, scales: { y: { beginAtZero: true } } })
    });
  }

  function updateCharts(member) {
    if (typeof Chart === 'undefined') return;
    var x = member.metrics || {};

    var mv = x.member || {};
    var mvKeys = ['Yea', 'Nay', 'Present', 'Not Voting'];
    charts.voteDist.data.labels = mvKeys;
    charts.voteDist.data.datasets[0].data = mvKeys.map(function (k) { return Number(mv[k]) || 0; });
    charts.voteDist.update('none');

    var al = x.alignment || {};
    charts.alignment.data.datasets[0].data = ALIGN_KEYS.map(function (k) { return Number(al[k]) || 0; });
    charts.alignment.update('none');

    charts.blocked.data.datasets[0].data = [Number(x.blocked_dem_count) || 0, Number(x.blocked_rep_count) || 0];
    charts.blocked.update('none');

    var months = Array.isArray(x.months) ? x.months : [];
    var monthly = x.monthly || {};
    charts.alignmentTime.data.labels = months.slice();
    for (var i = 0; i < ALIGN_KEYS.length; i++) {
      var arr = monthly[ALIGN_KEYS[i]];
      charts.alignmentTime.data.datasets[i].data = Array.isArray(arr) ? arr.slice() : months.map(function () { return 0; });
    }
    charts.alignmentTime.update('none');

    charts.withAgainst.data.datasets[0].data = [Number(x.voted_with_gop) || 0, Number(x.voted_with_dem) || 0];
    charts.withAgainst.data.datasets[1].data = [Number(x.voted_against_gop) || 0, Number(x.voted_against_dem) || 0];
    charts.withAgainst.update('none');
  }

  // ---- Table ----

  var COL_DEFS = [
    { key: 'y', numeric: true },
    { key: 'r', numeric: true },
    { key: 'd', numeric: false },
    { key: 'ln', numeric: false },
    { key: 'q', numeric: false },
    { key: 'ds', numeric: false },
    { key: 'rs', numeric: false },
    { key: 'm', numeric: false },
    { key: 'ry_rn', numeric: false },
    { key: 'dy_dn', numeric: false },
    { key: 'a', numeric: false },
    { key: 'b', numeric: false }
  ];

  function initSortHeaders() {
    var ths = els.tableHead.querySelectorAll('th');
    for (var i = 0; i < ths.length; i++) {
      ths[i].style.cursor = 'pointer';
      ths[i].setAttribute('data-col-index', String(i));
      ths[i].addEventListener('click', onSortClick);
    }
  }

  function onSortClick(e) {
    var idx = Number(e.currentTarget.getAttribute('data-col-index'));
    if (isNaN(idx)) return;
    if (state.sortCol === idx) {
      state.sortAsc = !state.sortAsc;
    } else {
      state.sortCol = idx;
      state.sortAsc = true;
    }
    updateSortIndicators();
    if (state.currentMember) renderTable(state.currentMember.metrics.rows || []);
  }

  function updateSortIndicators() {
    var ths = els.tableHead.querySelectorAll('th');
    for (var i = 0; i < ths.length; i++) {
      var base = ths[i].textContent.replace(/[▲▼]\s*$/, '').trim();
      ths[i].textContent = base + (i === state.sortCol ? (state.sortAsc ? ' ▲' : ' ▼') : '');
    }
  }

  function renderTable(rows) {
    var sorted = rows.slice();
    if (state.sortCol != null && state.sortCol >= 0 && state.sortCol < COL_DEFS.length) {
      var col = COL_DEFS[state.sortCol];
      var dir = state.sortAsc ? 1 : -1;
      sorted.sort(function (a, b) {
        var va, vb;
        if (col.key === 'ry_rn') { va = (a.ry || 0) - (a.rn || 0); vb = (b.ry || 0) - (b.rn || 0); }
        else if (col.key === 'dy_dn') { va = (a.dy || 0) - (a.dn || 0); vb = (b.dy || 0) - (b.dn || 0); }
        else { va = a[col.key]; vb = b[col.key]; }
        if (col.numeric) { va = Number(va) || 0; vb = Number(vb) || 0; return (va - vb) * dir; }
        va = String(va == null ? '' : va);
        vb = String(vb == null ? '' : vb);
        return va.localeCompare(vb) * dir;
      });
    }
    els.tableBody.replaceChildren();
    var frag = document.createDocumentFragment();
    for (var i = 0; i < sorted.length; i++) {
      var r = sorted[i];
      var tr = document.createElement('tr');
      appendCell(tr, r.y);
      appendCell(tr, r.r);
      appendCell(tr, r.d);
      appendCell(tr, r.ln);
      appendCell(tr, r.q);
      appendCell(tr, r.ds);
      appendCell(tr, r.rs);
      appendCell(tr, r.m);
      appendCell(tr, (r.ry || 0) + ' / ' + (r.rn || 0));
      appendCell(tr, (r.dy || 0) + ' / ' + (r.dn || 0));
      appendCell(tr, r.a);
      appendCell(tr, r.b);
      frag.appendChild(tr);
    }
    els.tableBody.appendChild(frag);
  }

  function appendCell(tr, val) {
    var td = document.createElement('td');
    td.textContent = val == null ? '' : String(val);
    tr.appendChild(td);
  }

  // ---- URL / history ----

  function buildShareUrl(id) {
    var params = new URLSearchParams();
    if (id) params.set('id', id);
    var q = (els.search.value || '').trim();
    if (q) params.set('q', q);

    var parties = getCheckedValues(els.filterParty);
    if (parties.length > 0 && parties.length < 3) params.set('p', parties.join(','));
    var chambers = getCheckedValues(els.filterChamber);
    if (chambers.length > 0 && chambers.length < 2) params.set('c', chambers.join(','));
    var statesSel = getSelectedStates();
    if (statesSel.length > 0 && statesSel.length < els.filterState.options.length) {
      params.set('s', statesSel.join(','));
    }
    var s = params.toString();
    return s ? ('?' + s) : window.location.pathname;
  }

  function debounceUrlReplace() {
    if (state.urlReplaceTimer) clearTimeout(state.urlReplaceTimer);
    // Debounce to avoid hammering history during keystrokes.
    state.urlReplaceTimer = setTimeout(function () {
      var u = buildShareUrl(state.currentId);
      history.replaceState({ id: state.currentId }, '', u);
    }, 250);
  }

  function restoreFiltersFromURL() {
    var params = new URLSearchParams(window.location.search);
    var p = params.get('p');
    var c = params.get('c');
    var s = params.get('s');
    var q = params.get('q');
    if (p) {
      var allowed = p.split(',');
      els.filterParty.querySelectorAll('input[type=checkbox]').forEach(function (i) {
        i.checked = allowed.indexOf(i.value) >= 0;
      });
    }
    if (c) {
      var allowedC = c.split(',');
      els.filterChamber.querySelectorAll('input[type=checkbox]').forEach(function (i) {
        i.checked = allowedC.indexOf(i.value) >= 0;
      });
    }
    if (s) {
      var allowedS = s.split(',');
      for (var i = 0; i < els.filterState.options.length; i++) {
        els.filterState.options[i].selected = allowedS.indexOf(els.filterState.options[i].value) >= 0;
      }
    }
    if (q) els.search.value = q;
  }

  function onPopState(e) {
    var params = new URLSearchParams(window.location.search);
    var id = params.get('id');
    if (id && isValidId(id)) {
      state.skipPush = true;
      selectMember(id);
    }
  }

  function initialSelect() {
    var params = new URLSearchParams(window.location.search);
    var urlId = params.get('id');
    if (urlId && isValidId(urlId)) {
      state.skipPush = true;
      selectMember(urlId);
      return;
    }
    var stored = null;
    try { stored = localStorage.getItem(LS_KEY); } catch (_) {}
    if (stored && isValidId(stored)) {
      state.skipPush = true;
      selectMember(stored);
      return;
    }
    // No selection — leave summary empty with a hint.
    els.summary.replaceChildren();
    var p = document.createElement('p');
    p.style.color = 'var(--ps-text-muted)';
    p.textContent = 'Pick a member to begin — type a name, set of initials (e.g., AOC), or use the filters at left.';
    els.summary.appendChild(p);
  }

})();