const app = {
  rows: [],
  active: null,
  filter: "all",
  search: "",
  searchTimer: null,
};

const $ = (id) => document.getElementById(id);

function escapeHtml(value) {
  return String(value ?? "")
    .replaceAll("&", "&")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}

async function json(path) {
  const res = await fetch(path);
  if (!res.ok) {
    let detail = res.statusText;
    try {
      const data = await res.json();
      detail = data.detail || detail;
    } catch (_) {
      detail = await res.text();
    }
    throw new Error(detail);
  }
  return res.json();
}

function fmtDate(value) {
  const text = String(value || "");
  if (!text) return "";
  if (/^\d{8}$/.test(text)) return `${text.slice(0, 4)}-${text.slice(4, 6)}-${text.slice(6, 8)}`;
  return text.replace("T", " ").slice(0, 19);
}

function fmtTime(value) {
  const digits = String(value || "").replace(/\D/g, "").slice(0, 6);
  if (digits.length < 6) return value || "";
  return `${digits.slice(0, 2)}:${digits.slice(2, 4)}:${digits.slice(4, 6)}`;
}

function fmtBytes(value) {
  const size = Number(value || 0);
  if (!size) return "0 B";
  const units = ["B", "KB", "MB", "GB", "TB"];
  const index = Math.min(units.length - 1, Math.floor(Math.log(size) / Math.log(1024)));
  return `${(size / 1024 ** index).toFixed(index ? 1 : 0)} ${units[index]}`;
}

function asList(value) {
  return Array.isArray(value) ? value : [];
}

function uniq(list) {
  return Array.from(new Set(list.filter(Boolean)));
}

function statusLabel(value) {
  return {
    complete: "PACS + UPP + STL",
    no_stl: "PACS + UPP",
    pacs_only: "仅 PACS",
    upp_only: "仅 UPP",
    unknown: "未知",
  }[value] || value || "未知";
}

function matchLabel(value) {
  return { exact: "CT 号精确一致", normalized: "去 D 前缀匹配" }[value] || "未匹配";
}

function partLabel(value) {
  return {
    head_neck: "头颈部",
    chest: "胸部",
    upper_abdomen: "上腹部",
    lower_abdomen: "下腹部",
    pelvis: "盆腔",
  }[value] || value;
}

function setDbStatus(data) {
  const pill = $("dbStatus");
  if (data.database?.ok) {
    pill.textContent = `${data.database.database} 已连接`;
    pill.className = "status-pill online";
  } else {
    pill.textContent = "数据库异常";
    pill.className = "status-pill offline";
  }
}

function renderMetrics(counts = {}) {
  const items = [
    ["CT 索引", counts.total_ct],
    ["PACS", counts.pacs_count],
    ["UPP", counts.upp_count],
    ["STL", counts.stl_count],
    ["完整关联", counts.complete_count],
    ["待判别序列", counts.undetermined_series],
  ];
  $("metrics").innerHTML = items
    .map(([label, value]) => `<div class="metric"><span>${escapeHtml(label)}</span><strong>${Number(value || 0)}</strong></div>`)
    .join("");
}

function cardTitle(row) {
  return [
    `规范CT号：${row.norm_ct}`,
    `PACS：${row.pacs_ct_number || "无"}`,
    `UPP：${row.upp_ct_number || "无"}`,
    `状态：${statusLabel(row.relation_status)}`,
    `PACS患者：${row.pacs_patient_name || "无"}`,
    `UPP患者：${row.upp_patient_name || "无"}`,
  ].join("\n");
}

function renderList() {
  const list = $("relationList");
  $("resultCount").textContent = String(app.rows.length);
  if (!app.rows.length) {
    list.innerHTML = `<p class="empty">没有匹配记录</p>`;
    return;
  }
  list.innerHTML = "";
  for (const row of app.rows) {
    const card = document.createElement("button");
    card.className = "relation-card";
    card.classList.toggle("active", app.active?.norm_ct === row.norm_ct);
    card.title = cardTitle(row);
    const date = row.study_date ? `${fmtDate(row.study_date)} ${fmtTime(row.study_time)}` : fmtDate(row.exam_date || row.task_created_at);
    const stlCount = Number(row.stl_file_count || row.stl_file_count_agg || 0);
    card.innerHTML = `
      <div class="card-row">
        <strong>${escapeHtml(row.norm_ct)}</strong>
        <i class="mini-badge ${escapeHtml(row.relation_status)}">${escapeHtml(statusLabel(row.relation_status))}</i>
      </div>
      <span>${escapeHtml(row.pacs_patient_name || row.upp_patient_name || "无姓名")} · ${escapeHtml(row.patient_id || row.patient_id_masked || "无ID")}</span>
      <small>${escapeHtml(date || "无时间")} · PACS ${Number(row.dicom_file_count || 0)} 张 · STL ${stlCount} 个</small>
      <small>${escapeHtml(matchLabel(row.match_type))}${Number(row.undetermined_series || 0) ? ` · ${Number(row.undetermined_series)} 待判别` : ""}</small>
    `;
    card.onclick = () => selectRelation(row.norm_ct);
    list.appendChild(card);
  }
}

function renderDl(id, entries) {
  const html = entries
    .map(([key, value]) => {
      const text = value || value === 0 ? String(value) : "-";
      return `<dt>${escapeHtml(key)}</dt><dd title="${escapeHtml(text)}">${escapeHtml(text)}</dd>`;
    })
    .join("");
  $(id).innerHTML = html;
}

function markNode(id, state, strong, meta) {
  const node = $(id);
  node.classList.remove("ok", "warn", "missing");
  node.classList.add(state);
  node.querySelector("strong").textContent = strong;
  node.querySelector("em").textContent = meta;
}

function groupSegments(row) {
  const names = asList(row.segment_names);
  const families = asList(row.segment_families);
  const categories = asList(row.segment_categories);
  const groups = new Map();
  names.forEach((name, index) => {
    const key = categories[index] || families[index] || "未分类";
    if (!groups.has(key)) groups.set(key, []);
    groups.get(key).push(name);
  });
  return groups;
}

function renderSegments(row) {
  const groups = groupSegments(row);
  const count = asList(row.segment_names).length;
  $("segmentCount").textContent = `${count} 个`;
  if (!count) {
    $("segmentGroups").innerHTML = `<p class="empty">没有 STL 分割文件</p>`;
    return;
  }
  $("segmentGroups").innerHTML = Array.from(groups.entries())
    .map(
      ([group, names]) => `
        <div class="segment-group">
          <strong>${escapeHtml(group)}</strong>
          <div class="segment-tags">${names.map((name) => `<em title="${escapeHtml(name)}">${escapeHtml(name)}</em>`).join("")}</div>
        </div>
      `,
    )
    .join("");
}

function renderDetail(row) {
  app.active = row;
  $("activeCt").textContent = row.norm_ct || "未选择 CT";
  $("activeSubtitle").textContent = `${row.pacs_ct_number || "无 PACS"} ↔ ${row.upp_ct_number || "无 UPP"} · ${matchLabel(row.match_type)}`;
  const badge = $("relationBadge");
  badge.className = `relation-badge ${row.relation_status || "idle"} ${row.match_type === "normalized" ? "normalized" : ""}`;
  badge.textContent = statusLabel(row.relation_status);

  $("nodeCtValue").textContent = row.norm_ct || "-";
  markNode("nodePacs", row.pacs_present ? "ok" : "missing", row.pacs_ct_number || "缺失", `${Number(row.dicom_file_count || 0)} 张 · ${Number(row.pacs_series_count || 0)} 序列`);
  markNode("nodeUpp", row.upp_present ? "ok" : "missing", row.upp_ct_number || "缺失", row.upp_status || row.algorithm_model || "无任务状态");
  markNode("nodeStl", row.stl_present ? "ok" : "warn", row.stl_present ? "已生成" : "未生成", `${Number(row.stl_file_count || row.stl_file_count_agg || 0)} STL · ${fmtBytes(row.stl_total_bytes || row.stl_total_bytes_agg)}`);

  renderDl("pacsDetails", [
    ["CT号", row.pacs_ct_number],
    ["患者", row.pacs_patient_name],
    ["患者ID", row.patient_id],
    ["检查时间", `${fmtDate(row.study_date)} ${fmtTime(row.study_time)}`.trim()],
    ["描述", row.study_description],
    ["序列/文件", `${Number(row.pacs_series_count || 0)} / ${Number(row.dicom_file_count || 0)}`],
    ["标注", `${Number(row.annotated_series || 0)} 已标注 · ${Number(row.undetermined_series || 0)} 待判别`],
    ["完成", row.completed ? "已完成" : "待处理"],
    ["部位", asList(row.body_parts).map(partLabel).join("、")],
  ]);

  renderDl("uppDetails", [
    ["CT号", row.upp_ct_number],
    ["患者", row.upp_patient_name],
    ["年龄/性别", [row.patient_age, row.upp_patient_sex].filter(Boolean).join(" / ")],
    ["检查时间", fmtDate(row.exam_date)],
    ["任务时间", fmtDate(row.task_created_at)],
    ["算法模型", row.algorithm_model],
    ["状态", row.upp_status],
    ["列表记录", row.list_present ? `${Number(row.list_record_count || 0)} 条` : "无"],
    ["患者名", row.patient_name_match === "same" ? "两侧一致" : row.patient_name_match === "different" ? "两侧不同" : "无法判断"],
  ]);

  renderDl("stlDetails", [
    ["STL状态", row.stl_present ? "存在" : "缺失"],
    ["文件数", Number(row.stl_file_count || row.stl_file_count_agg || 0)],
    ["总大小", fmtBytes(row.stl_total_bytes || row.stl_total_bytes_agg)],
    ["目录", row.processed_stl_dir],
    ["分类", uniq(asList(row.segment_categories)).join("、")],
    ["Family", uniq(asList(row.segment_families)).join("、")],
    ["更新时间", fmtDate(row.stl_updated_at || row.upp_updated_at)],
  ]);

  renderSegments(row);
  renderList();
}

async function selectRelation(normCt) {
  const row = await json(`/api/relations/${encodeURIComponent(normCt)}`);
  renderDetail(row);
}

async function loadStatus() {
  const data = await json("/api/status");
  setDbStatus(data);
  renderMetrics(data.counts || {});
}

async function loadRelations() {
  const params = new URLSearchParams();
  params.set("status", app.filter);
  params.set("limit", "500");
  if (app.search) params.set("q", app.search);
  app.rows = await json(`/api/relations?${params.toString()}`);
  if (app.rows.length && !app.rows.some((row) => row.norm_ct === app.active?.norm_ct)) {
    await selectRelation(app.rows[0].norm_ct);
  } else {
    renderList();
    if (!app.active && app.rows.length) await selectRelation(app.rows[0].norm_ct);
  }
}

async function refreshAll() {
  try {
    await loadStatus();
    await loadRelations();
  } catch (err) {
    $("dbStatus").textContent = err.message;
    $("dbStatus").className = "status-pill offline";
  }
}

function wire() {
  $("refreshBtn").addEventListener("click", refreshAll);
  $("searchInput").addEventListener("input", () => {
    clearTimeout(app.searchTimer);
    app.searchTimer = setTimeout(() => {
      app.search = $("searchInput").value.trim();
      loadRelations();
    }, 250);
  });
  document.querySelectorAll("[data-filter]").forEach((button) => {
    button.addEventListener("click", () => {
      app.filter = button.dataset.filter;
      document.querySelectorAll("[data-filter]").forEach((item) => item.classList.toggle("active", item === button));
      loadRelations();
    });
  });
}

wire();
refreshAll();