// Split Tester client. Reuses the text-ad writer to produce candidates, then
// launches the chosen ones as one test through the Traffic Desk.
(function () {
  'use strict';
  var $ = function (id) { return document.getElementById(id); };
  function esc(s) {
    return String(s == null ? '' : s).replace(/[&<>"']/g, function (c) {
      return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c];
    });
  }
  function n(v) { return Number(v || 0).toLocaleString(); }

  var state = {
    angle: 'general', angles: [], variants: [], picked: [], target: 'join',
    remaining: 0, limit: 0, hasPage: false, minPerArm: 500, maxArms: 3, id: null
  };
  var busy = false;

  function chip(label, on, fn) {
    var b = document.createElement('button');
    b.type = 'button';
    b.className = 's-chip' + (on ? ' on' : '');
    b.textContent = label;
    b.addEventListener('click', fn);
    return b;
  }

  function gate(msg) {
    $('sGate').style.display = 'block';
    $('sGate').innerHTML = msg;
    $('sCard').style.opacity = '.55';
    $('sGo').disabled = true;
    $('sWrite').disabled = true;
  }

  function renderAngles() {
    var host = $('sAngles');
    host.innerHTML = '';
    state.angles.forEach(function (a) {
      host.appendChild(chip(a.label, state.angle === a.key, function () {
        state.angle = a.key; renderAngles();
      }));
    });
  }

  function renderTargets() {
    var host = $('sTargets');
    host.innerHTML = '';
    host.appendChild(chip('My invite page', state.target === 'join', function () {
      state.target = 'join'; renderTargets();
    }));
    if (state.hasPage) {
      host.appendChild(chip('My personal page', state.target === 'page', function () {
        state.target = 'page'; renderTargets();
      }));
    }
  }

  function renderVariants() {
    var host = $('sVariants');
    host.innerHTML = '';
    if (!state.variants.length) return;
    var grid = document.createElement('div');
    grid.className = 's-ads';
    state.variants.forEach(function (v, i) {
      var pickIdx = state.picked.indexOf(i);
      var card = document.createElement('div');
      card.className = 's-ad' + (pickIdx !== -1 ? ' on' : '');
      if (pickIdx !== -1) {
        var tag = document.createElement('span');
        tag.className = 'tag';
        tag.textContent = String.fromCharCode(65 + pickIdx);
        card.appendChild(tag);
      }
      var s = document.createElement('div');
      s.className = 's'; s.textContent = v.subject;
      card.appendChild(s);
      v.lines.forEach(function (l) {
        if (!l) return;
        var d = document.createElement('div');
        d.className = 'l'; d.textContent = l;
        card.appendChild(d);
      });
      card.addEventListener('click', function () {
        var at = state.picked.indexOf(i);
        if (at !== -1) state.picked.splice(at, 1);
        else if (state.picked.length < state.maxArms) state.picked.push(i);
        renderVariants(); splitHint();
      });
      grid.appendChild(card);
    });
    host.appendChild(grid);
    var hint = document.createElement('div');
    hint.className = 's-hint';
    hint.textContent = 'Tap 2 or 3 of these to put them head to head. Tap again to unpick.';
    host.appendChild(hint);
  }

  function splitHint() {
    var arms = state.picked.length;
    var total = Number($('sImp').value) || 0;
    var el = $('sSplitHint');
    if (arms < 2) {
      el.textContent = 'Pick at least two versions above first.';
      return;
    }
    var per = Math.floor(total / arms);
    var need = state.minPerArm * arms;
    el.innerHTML = arms + ' versions × <b>' + n(per) + '</b> impressions each. ' +
      (per < state.minPerArm
        ? '<span style="color:#f0a05a">Too thin to mean anything — use at least ' + n(need) + ' total for ' + arms + ' versions.</span>'
        : 'Comes out of this month\'s allowance; stopping the test returns whatever has not served.');
  }

  async function writeAds(btn) {
    btn.disabled = true;
    btn.innerHTML = '<span class="spin"></span>Writing…';
    $('sErr').style.display = 'none';
    try {
      var r = await fetch('/api/public/suite-textads', {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ angle: state.angle })
      });
      var d = await r.json();
      if (!r.ok) {
        $('sErr').textContent = d.error || 'The writer could not produce versions just now.';
        $('sErr').style.display = 'block';
      } else {
        state.variants = d.variants || [];
        state.picked = state.variants.length >= 2 ? [0, 1] : [];
        renderVariants(); splitHint();
        if (d.meter) $('sWriteMeter').textContent = d.meter.remaining + ' of ' + d.meter.limit + ' batches left this month';
      }
    } catch (e) {
      $('sErr').textContent = 'Connection hiccup — try again.';
      $('sErr').style.display = 'block';
    }
    btn.disabled = false;
    btn.innerHTML = state.variants.length ? '✍️ Write different versions' : '✍️ Write me some versions';
  }

  function renderTests(tests) {
    if (!tests || !tests.length) { $('sTestsWrap').style.display = 'none'; return; }
    $('sTestsWrap').style.display = 'block';
    var host = $('sTests');
    host.innerHTML = '';
    tests.forEach(function (t) {
      var box = document.createElement('div');
      box.className = 's-test';
      var when = String(t.at || '').slice(0, 10);
      var best = (t.verdict && t.verdict.winner) || null;

      var rows = (t.armResults || []).map(function (a) {
        return '<tr class="' + (best === a.arm ? 'win' : '') + '">' +
          '<td><b>' + esc(a.arm) + '</b></td>' +
          '<td><b>' + esc(a.subject) + '</b><br><span style="font-size:12px">' +
            (a.lines || []).filter(Boolean).map(esc).join(' · ') + '</span></td>' +
          '<td>' + n(a.served) + '</td>' +
          '<td><b>' + n(a.clicks) + '</b></td>' +
          '<td>' + (a.served > 0 ? (a.rate * 100).toFixed(3) + '%' : '—') + '</td></tr>';
      }).join('');

      box.innerHTML =
        '<h3>Test from ' + esc(when) + ' — ' + n(t.total) + ' impressions across ' + (t.arms || []).length + ' versions' +
          (t.stopped ? ' <span style="color:var(--muted);font-weight:400">(stopped, ' + n(t.refunded) + ' returned)</span>' : '') + '</h3>' +
        '<div class="s-verdict ' + esc((t.verdict && t.verdict.state) || 'running') + '">' +
          esc((t.verdict && t.verdict.text) || '') + '</div>' +
        '<div class="table-wrap"><table class="s-tbl"><thead><tr><th></th><th>Version</th><th>Served</th><th>Clicks</th><th>Click rate</th></tr></thead><tbody>' +
        rows + '</tbody></table></div>';

      if (!t.stopped) {
        var btn = document.createElement('button');
        btn.className = 'btn btn-secondary btn-sm';
        btn.style.marginTop = '10px';
        btn.textContent = 'Stop this test';
        btn.title = 'Stops every version and returns the unserved impressions';
        btn.addEventListener('click', function () { stopTest(t.testId, btn); });
        box.appendChild(btn);
      }
      host.appendChild(box);
    });
  }

  async function stopTest(testId, btn) {
    btn.disabled = true; btn.textContent = 'Stopping…';
    try {
      var r = await fetch('/api/public/suite-split', {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ stop: testId })
      });
      var d = await r.json();
      if (!r.ok) {
        $('sErr').textContent = d.error || 'Could not stop that test.';
        $('sErr').style.display = 'block';
        btn.disabled = false; btn.textContent = 'Stop this test';
        return;
      }
      $('sOk').innerHTML = '✅ <b>Test stopped.</b> ' + n(d.stopped.refunded) + ' unserved impressions went back into your balance.';
      $('sOk').style.display = 'block';
      boot();
    } catch (e) {
      btn.disabled = false; btn.textContent = 'Stop this test';
    }
  }

  function apply(d) {
    state.id = d.id;
    state.hasPage = !!d.hasPage;
    state.minPerArm = d.minPerArm || 500;
    state.maxArms = d.maxArms || 3;
    state.angles = d.textAngles || state.angles;
    if (!state.hasPage && state.target === 'page') state.target = 'join';
    var tr = d.traffic || {};
    state.remaining = tr.remaining || 0;
    state.limit = tr.limit || 0;
    $('sBal').style.display = 'flex';
    $('sRemain').textContent = n(state.remaining);
    $('sLimit').textContent = n(state.limit);
    $('sImp').max = state.remaining;
    if (Number($('sImp').value) > state.remaining) $('sImp').value = state.remaining;
    if (d.textMeter) $('sWriteMeter').textContent = d.textMeter.remaining + ' of ' + d.textMeter.limit + ' batches left this month';
    renderAngles(); renderTargets(); renderVariants(); splitHint();
    renderTests(d.tests || []);
    if (state.remaining < state.minPerArm * 2) {
      $('sGo').disabled = true;
      $('sGo').textContent = 'Not enough impressions left this month';
    }
  }

  async function run() {
    if (busy) return;
    $('sErr').style.display = 'none';
    $('sOk').style.display = 'none';
    if (state.picked.length < 2) {
      $('sErr').textContent = 'Pick at least two versions to compare.';
      $('sErr').style.display = 'block';
      return;
    }
    busy = true;
    $('sGo').disabled = true;
    $('sGo').innerHTML = '<span class="spin"></span>Launching every version…';
    try {
      var arms = state.picked.map(function (i) {
        return { subject: state.variants[i].subject, lines: state.variants[i].lines };
      });
      var r = await fetch('/api/public/suite-split', {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ arms: arms, impressions: Number($('sImp').value) || 0, target: state.target, angle: state.angle })
      });
      var d = await r.json();
      if (!r.ok) {
        $('sErr').textContent = d.error || 'That did not go through — try again.';
        $('sErr').style.display = 'block';
      } else {
        $('sOk').innerHTML = '✅ <b>Test running.</b> ' + d.test.arms.length + ' versions, ' +
          n(d.test.perArm) + ' impressions each. Check back in a few days — display clicks take a while to accumulate.';
        $('sOk').style.display = 'block';
        setTimeout(boot, 800);
      }
    } catch (e) {
      $('sErr').textContent = 'Connection hiccup — try again.';
      $('sErr').style.display = 'block';
    }
    busy = false;
    $('sGo').disabled = false;
    $('sGo').textContent = '🔬 Start the test';
  }

  async function boot() {
    try {
      var r = await fetch('/api/public/suite-split');
      if (r.status === 401) { gate('You’re not signed in yet. <a href="/suite" style="color:var(--gold);font-weight:700">Open the Suite</a> and connect the wallet that holds your position, then come back.'); return; }
      if (r.status === 403) {
        var g = await r.json();
        gate((g.error || 'Not open for this position yet.') + ' <a href="/suite" style="color:var(--gold);font-weight:700">See your Suite</a>.');
        return;
      }
      if (!r.ok) return;
      apply(await r.json());
    } catch (e) {}
  }

  document.addEventListener('DOMContentLoaded', function () {
    boot();
    $('sGo').addEventListener('click', run);
    $('sWrite').addEventListener('click', function () { writeAds(this); });
    $('sImp').addEventListener('input', splitHint);
  });
})();