'use strict';

// Tab switching
document.querySelectorAll('.tab-btn').forEach(btn => {
  btn.addEventListener('click', () => {
    const tab = btn.dataset.tab;
    document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
    document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
    btn.classList.add('active');
    document.getElementById(`tab-${tab}`).classList.add('active');
    if (tab === 'history') loadHistory();
  });
});

// Sync range <-> number inputs
function syncRangeNumber(rangeId, numId) {
  const range = document.getElementById(rangeId);
  const num   = document.getElementById(numId);
  range.addEventListener('input', () => num.value = range.value);
  num.addEventListener('input', () => range.value = num.value);
}
syncRangeNumber('vus', 'vus-num');
syncRangeNumber('duration', 'duration-num');

// Show/hide request body for non-GET methods
const methodSel = document.getElementById('httpMethod');
const bodyGroup = document.getElementById('body-group');
methodSel.addEventListener('change', () => {
  const m = methodSel.value;
  bodyGroup.style.display = (m !== 'GET' && m !== 'HEAD') ? '' : 'none';
});

// gzip toggle hint
const gzipChk  = document.getElementById('gzip');
const gzipHint = document.getElementById('gzip-hint');
gzipChk.addEventListener('change', () => {
  gzipHint.textContent = gzipChk.checked
    ? 'k6 default — server may compress response'
    : 'Sends Accept-Encoding: identity — forces uncompressed response';
});

// ---- Run Test ----
const form      = document.getElementById('test-form');
const startBtn  = document.getElementById('start-btn');
const resultPanel = document.getElementById('result-panel');
const outputLog   = document.getElementById('output-log');
const resultStatus= document.getElementById('result-status');
const summaryPanel= document.getElementById('summary-panel');
const summaryCards= document.getElementById('summary-cards');

form.addEventListener('submit', async (e) => {
  e.preventDefault();

  const url         = document.getElementById('url').value.trim();
  const vus         = parseInt(document.getElementById('vus-num').value, 10);
  const duration    = parseInt(document.getElementById('duration-num').value, 10);
  const rpsLimit    = parseInt(document.getElementById('rpsLimit').value, 10) || 0;
  const httpMethod  = document.getElementById('httpMethod').value;
  const requestBody = document.getElementById('requestBody').value.trim();
  const headers     = document.getElementById('headers').value.trim() || '{}';
  const cacheMode   = document.getElementById('cacheMode').value;
  const gzip        = document.getElementById('gzip').checked;

  // Validate headers JSON
  try { JSON.parse(headers); } catch {
    alert('Custom Headers must be valid JSON (or leave empty).');
    return;
  }

  startBtn.disabled = true;
  startBtn.textContent = '⏳ Running…';
  outputLog.textContent = '';
  summaryPanel.style.display = 'none';
  resultPanel.style.display = '';
  resultStatus.textContent = 'running';
  resultStatus.className = 'badge running';

  let res;
  try {
    res = await fetch('/api/tests', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ url, vus, duration, rpsLimit, httpMethod, requestBody, headers, cacheMode, gzip }),
    });
  } catch (err) {
    alert('Failed to start test: ' + err.message);
    resetBtn();
    return;
  }

  if (!res.ok) {
    const err = await res.json().catch(() => ({ error: res.statusText }));
    alert('Error: ' + err.error);
    resetBtn();
    return;
  }

  const { id } = await res.json();
  streamTest(id);
});

function streamTest(id) {
  const es = new EventSource(`/api/tests/${id}/stream`);

  es.onmessage = (e) => {
    const data = JSON.parse(e.data);

    if (data.chunk) {
      outputLog.textContent += data.chunk;
      outputLog.scrollTop = outputLog.scrollHeight;
    }

    if (data.done) {
      es.close();
      resultStatus.textContent = data.status;
      resultStatus.className = `badge ${data.status}`;
      if (data.summary) renderSummary(data.summary);
      resetBtn();
    }

    if (data.error) {
      es.close();
      outputLog.textContent += '\n[error] ' + data.error;
      resetBtn();
    }
  };

  es.onerror = () => {
    es.close();
    resetBtn();
  };
}

function resetBtn() {
  startBtn.disabled = false;
  startBtn.textContent = '▶ Run Test';
}

function renderSummary(summary) {
  if (!summary || Object.keys(summary).length === 0) return;
  summaryPanel.style.display = '';
  summaryCards.innerHTML = '';

  // ---- Threshold pass/fail banner ----
  if (summary.thresholds && summary.thresholds.length) {
    const allPass = summary.thresholds.every(t => t.pass);
    const banner = document.createElement('div');
    banner.className = `threshold-banner ${allPass ? 'pass' : 'fail'}`;
    banner.innerHTML = `<strong>${allPass ? '✓ All thresholds passed' : '✗ Some thresholds failed'}</strong>
      <ul>${summary.thresholds.map(t =>
        `<li class="${t.pass ? 'pass' : 'fail'}">${t.pass ? '✓' : '✗'} ${escHtml(t.label)}</li>`
      ).join('')}</ul>`;
    summaryCards.appendChild(banner);
  }

  // ---- Metric cards ----
  const cards = [];

  if (summary.http_reqs) {
    cards.push({ label: 'Total Requests', value: summary.http_reqs[0], cls: 'info' });
    cards.push({ label: 'Throughput', value: summary.http_reqs[1], cls: 'info' });
  }
  if (summary.http_req_failed) {
    const pct = parseFloat(summary.http_req_failed[0]);
    const detail = summary.http_req_failed[1] != null
      ? ` (${summary.http_req_failed[1]}/${summary.http_req_failed[2]})`
      : '';
    cards.push({ label: 'Failed Requests', value: summary.http_req_failed[0] + detail, cls: pct > 0 ? 'bad' : 'good' });
  }
  if (summary.checks) {
    const pct = parseFloat(summary.checks[0]);
    cards.push({ label: 'Checks Passed', value: `${summary.checks[0]} (${summary.checks[1]}/${summary.checks[2]})`, cls: pct < 100 ? 'bad' : 'good' });
  }
  if (summary.http_req_duration) {
    const d = summary.http_req_duration;
    // d = [avg, min, med, max, p90, p95, p99]
    cards.push({ label: 'Avg Response', value: d[0], cls: 'info' });
    cards.push({ label: 'Median (p50)', value: d[2], cls: 'info' });
    cards.push({ label: 'p(90)', value: d[4], cls: 'info' });
    cards.push({ label: 'p(95)', value: d[5], cls: 'info' });
    cards.push({ label: 'p(99)', value: d[6], cls: 'info' });
    cards.push({ label: 'Max Response', value: d[3], cls: 'info' });
  }
  if (summary.iterations) {
    cards.push({ label: 'Iterations', value: summary.iterations[0], cls: 'info' });
    cards.push({ label: 'Iter/s', value: summary.iterations[1], cls: 'info' });
  }
  if (summary.data_received) {
    cards.push({ label: 'Data Received', value: summary.data_received[0], cls: 'info' });
  }

  const grid = document.createElement('div');
  grid.className = 'summary-grid';
  for (const c of cards) {
    const div = document.createElement('div');
    div.className = 'summary-card';
    div.innerHTML = `<div class="label">${c.label}</div><div class="value ${c.cls}">${c.value}</div>`;
    grid.appendChild(div);
  }
  summaryCards.appendChild(grid);
}

// ---- History ----
async function loadHistory() {
  const container = document.getElementById('history-list');

  let tests;
  try {
    const res = await fetch('/api/tests');
    tests = await res.json();
  } catch {
    container.innerHTML = '<p class="empty">Failed to load history.</p>';
    return;
  }

  if (!tests.length) {
    container.innerHTML = '<p class="empty">No tests yet.</p>';
    return;
  }

  container.innerHTML = '';

  for (const t of tests) {
    const item = document.createElement('div');
    item.className = 'history-item';
    item.dataset.id = t.id;

    const date = new Date(t.created_at).toLocaleString();
    const dur  = t.finished_at ? `${Math.round((t.finished_at - t.created_at) / 1000)}s` : `${t.duration}s`;

    let summaryLine = '';
    if (t.summary) {
      const s = t.summary;
      const parts = [];
      if (s.http_reqs)        parts.push(`${s.http_reqs[0]} reqs @ ${s.http_reqs[1]}`);
      if (s.http_req_duration) parts.push(`avg ${s.http_req_duration[0]}`);
      if (s.http_req_failed)  parts.push(`${s.http_req_failed[0]} failed`);
      summaryLine = parts.join(' · ');
    }

    const cacheBadge = t.cache_mode === 'bust'
      ? '<span class="pill bust">cache-bust</span>'
      : t.cache_mode === 'no-cache'
      ? '<span class="pill no-cache">no-cache</span>'
      : '<span class="pill cached">cached</span>';
    const gzipBadge = t.gzip
      ? '<span class="pill gzip">gzip</span>'
      : '<span class="pill no-gzip">no-gzip</span>';

    item.innerHTML = `
      <div>
        <div class="row1">
          <span class="badge ${t.status}">${t.status}</span>
          <span class="url">${escHtml(t.url)}</span>
          <span class="meta">${t.http_method} · ${t.vus} VUs · ${dur}</span>
          ${cacheBadge}${gzipBadge}
        </div>
        <div class="meta">${date}</div>
        ${summaryLine ? `<div class="history-summary">${escHtml(summaryLine)}</div>` : ''}
      </div>
      <div class="actions">
        <button class="btn-del" title="Delete" data-id="${t.id}">&#x2715;</button>
      </div>
    `;

    item.querySelector('.btn-del').addEventListener('click', async (e) => {
      e.stopPropagation();
      if (!confirm('Delete this test from history?')) return;
      await fetch(`/api/tests/${t.id}`, { method: 'DELETE' });
      loadHistory();
    });

    item.addEventListener('click', () => showHistoryDetail(t.id, item));

    container.appendChild(item);
  }
}

async function showHistoryDetail(id, itemEl) {
  // Toggle: if detail already open for this item, close it
  const existing = document.getElementById('history-detail');
  if (existing) {
    const wasThis = existing.dataset.for === id;
    existing.remove();
    if (wasThis) return;
  }

  const res = await fetch(`/api/tests/${id}`);
  const test = await res.json();

  const detail = document.createElement('div');
  detail.id = 'history-detail';
  detail.dataset.for = id;

  let summaryHtml = '';
  if (test.summary && Object.keys(test.summary).length) {
    const s = test.summary;
    const rows = [
      s.http_reqs        && `<tr><td>Total Requests</td><td>${s.http_reqs[0]} (${s.http_reqs[1]})</td></tr>`,
      s.http_req_duration && `<tr><td>Duration avg/med/p95/max</td><td>${s.http_req_duration[0]} / ${s.http_req_duration[2]} / ${s.http_req_duration[5]} / ${s.http_req_duration[3]}</td></tr>`,
      s.http_req_failed  && `<tr><td>Failure Rate</td><td>${s.http_req_failed[0]}</td></tr>`,
      s.iterations       && `<tr><td>Iterations</td><td>${s.iterations[0]} (${s.iterations[1]})</td></tr>`,
    ].filter(Boolean).join('');
    if (rows) summaryHtml = `<table style="width:100%;border-collapse:collapse;font-size:.85rem;margin-bottom:.75rem">
      <tbody>${rows}</tbody></table>`;
  }

  detail.innerHTML = `
    <h3 style="margin-bottom:.75rem">Details: ${escHtml(test.url)}</h3>
    ${summaryHtml}
    <pre>${escHtml(test.output || '(no output)')}</pre>
  `;

  // Add style to table cells inline
  detail.querySelectorAll('td').forEach((td, i) => {
    td.style.padding = '.3rem .5rem';
    td.style.borderBottom = '1px solid var(--border)';
    if (i % 2 === 0) td.style.color = 'var(--muted)';
  });

  itemEl.insertAdjacentElement('afterend', detail);
}

document.getElementById('refresh-history').addEventListener('click', loadHistory);

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