'use strict';

const $ = (id) => document.getElementById(id);
let pollTimer = null;

// ---------- 启动:轮询索引状态(服务器开机自动建索引) ----------
window.addEventListener('DOMContentLoaded', pollStatus);

function pollStatus() {
  clearInterval(pollTimer);
  tick();
  pollTimer = setInterval(tick, 800);
}

async function tick() {
  let s;
  try { s = await (await fetch('/api/status')).json(); }
  catch { $('status').textContent = '连接服务失败,确认服务器已启动。'; return; }

  // BM25 就绪即可搜(向量还在编码也能先看关键词路)
  if (s.bm25_ready) { $('q').disabled = false; $('search').disabled = false; }

  const bar = $('buildBar');
  if (s.state === 'building') {
    bar.classList.remove('hidden');
    if (s.phase === 'loadmodel') {
      $('status').textContent = `图片 ${s.n_images} 张 / 名称 ${s.total} 个 · 正在加载向量模型…`;
      setBar('加载本地向量模型 BGE-M3(首次需下载约 2.3G)…', 8);
    } else if (s.phase === 'embedding') {
      const pct = s.emb_total ? Math.round((s.emb_done / s.emb_total) * 100) : 0;
      const dev = s.device ? ` · ${s.device}` : '';
      $('status').textContent = `图片 ${s.n_images} 张 / 名称 ${s.total} 个 · 向量编码中(BM25 已就绪,可先搜)`;
      setBar(`向量编码中${dev} ${s.emb_done}/${s.emb_total}`, pct);
    } else {
      $('status').textContent = 'BM25 分词建索引中…';
      setBar('BM25 分词建索引中…', 4);
    }
  } else if (s.state === 'ready') {
    clearInterval(pollTimer);
    const dev = s.device ? ` (${s.device})` : '';
    const note = s.failed ? `,${s.failed} 条失败` : '';
    $('status').innerHTML = `✓ 就绪:<b>${s.total}</b> 个名称 / <b>${s.n_images}</b> 张图${dev}${note} —— 直接搜索吧。`;
    bar.classList.add('hidden');
  } else if (s.state === 'error') {
    clearInterval(pollTimer);
    $('status').textContent = '❌ ' + (s.message || '建索引失败');
    bar.classList.add('hidden');
  }
}

function setBar(t, pct) {
  $('buildText').textContent = t;
  $('barFill').style.width = (pct || 0) + '%';
}

// ---------- 搜索 ----------
$('search').addEventListener('click', doSearch);
$('q').addEventListener('keydown', (e) => { if (e.key === 'Enter') doSearch(); });

async function doSearch() {
  const q = $('q').value.trim();
  if (!q) return;
  const params = new URLSearchParams({
    q, topk: $('topk').value || 20, rrf_k: $('rrfk').value || 60,
    w_bm25: $('wbm').value || 1, w_vec: $('wvec').value || 1,
  });
  let d;
  try { d = await (await fetch('/api/search?' + params)).json(); }
  catch (err) { alert('搜索失败:' + err.message); return; }

  renderCol('bm25', d.bm25);
  renderCol('vector', d.vector);
  renderCol('fusion', d.fusion);
}

function renderCol(kind, items) {
  $('cnt-' + kind).textContent = items.length ? `共 ${items.length}` : '';
  const box = $('col-' + kind);
  box.innerHTML = '';
  if (!items.length) { box.innerHTML = '<div class="empty">无结果</div>'; return; }
  items.forEach((it, i) => box.appendChild(card(kind, it, i + 1)));
}

function card(kind, it, rank) {
  const el = document.createElement('div');
  el.className = 'card';

  const primary = kind === 'bm25' ? `BM25 ${fmt(it.bm25)}`
    : kind === 'vector' ? `余弦 ${fmt(it.vec)}`
      : `RRF ${fmt(it.score)}`;

  const badges = [];
  if (kind !== 'bm25') badges.push(rankBadge('BM25', it.bm25_rank));
  if (kind !== 'vector') badges.push(rankBadge('向量', it.vec_rank));

  const src = imgURL(it.files && it.files[0]);
  el.innerHTML = `
    <div class="rk">${rank}</div>
    ${src ? `<img loading="lazy" src="${src}" title="${esc(it.name)}">` : '<div class="card-img"></div>'}
    <div class="meta">
      <div class="nm" title="${esc(it.name)}">${esc(it.name)}</div>
      <div class="sc">${primary}</div>
      <div class="badges">${badges.join('')}</div>
    </div>`;
  return el;
}

function rankBadge(label, rank) {
  return rank
    ? `<span class="badge">${label}#${rank}</span>`
    : `<span class="badge miss">${label}未命中</span>`;
}

function imgURL(file) {
  return file ? '/images/' + encodeURIComponent(file) : '';
}

const fmt = (v) => (v === null || v === undefined ? '—' : v);
const esc = (s) => String(s).replace(/[&<>"]/g, (c) =>
  ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]));