// app.js — 视图路由、运行列表渲染、健康检查。整个控制台的入口编排。

const App = {
  currentRunId: null,
  views: ["runs", "new", "report"],
  titles: { runs: "运行列表", new: "新建评估", report: "报告详情" },

  // 初始化：绑定导航、加载首屏、启动健康检查。
  init() {
    document.querySelectorAll(".nav-item").forEach((btn) => {
      btn.addEventListener("click", () => App.switchView(btn.dataset.view));
    });
    document.getElementById("refresh-btn").addEventListener("click", () => App.refreshCurrent());

    Runner.init();
    App.switchView("runs");
    App.checkHealth();
    setInterval(App.checkHealth, 15000);
  },

  // 切换主视图，并同步导航高亮与标题。
  switchView(view) {
    if (view === "report" && !App.currentRunId) {
      // 没有选中的运行时，报告页显示占位。
    }
    App.views.forEach((name) => {
      const el = document.getElementById(`view-${name}`);
      if (el) el.hidden = name !== view;
    });
    document.querySelectorAll(".nav-item").forEach((btn) => {
      btn.classList.toggle("active", btn.dataset.view === view);
    });
    document.getElementById("view-title").textContent = App.titles[view] || view;
    App.activeView = view;

    if (view === "runs") App.loadRuns();
    if (view === "new") Runner.loadScenarios();
    if (view === "report") Report.render(App.currentRunId);
  },

  // 刷新当前视图的数据。
  refreshCurrent() {
    App.switchView(App.activeView || "runs");
  },

  // 加载并渲染运行列表。
  async loadRuns() {
    const container = document.getElementById("runs-container");
    const empty = document.getElementById("runs-empty");
    container.innerHTML = '<p class="muted">加载中…</p>';
    try {
      const data = await API.runs();
      const runs = data.runs || [];
      if (runs.length === 0) {
        container.innerHTML = "";
        empty.hidden = false;
        return;
      }
      empty.hidden = true;
      container.innerHTML = "";
      runs.forEach((run) => container.appendChild(App.renderRunCard(run)));
    } catch (err) {
      container.innerHTML = `<p class="muted">加载失败：${App.escape(err.message)}</p>`;
    }
  },

  // 构造一张运行卡片。
  renderRunCard(run) {
    const card = document.createElement("div");
    card.className = "run-card";
    card.addEventListener("click", () => {
      App.currentRunId = run.run_id;
      App.enableReportNav();
      App.switchView("report");
    });

    const chips = (run.metrics || [])
      .map((m) => {
        const val = run.metric_means ? run.metric_means[m] : null;
        const cls = App.scoreClass(val);
        const text = val === null || val === undefined ? "n/a" : val.toFixed(2);
        return `<span class="metric-chip">${App.escape(App.shortMetric(m))} <b class="${cls}">${text}</b></span>`;
      })
      .join("");

    card.innerHTML = `
      <div class="run-card-head">
        <div class="run-card-title">${App.escape(run.scenario_name || run.run_id)}</div>
      </div>
      <div class="run-card-meta">
        <div>${App.escape(run.mode || "—")} · judge: ${App.escape(run.judge_model || "—")}</div>
        <div>${run.valid_samples} 有效 / ${run.invalid_samples} 无效 · ${App.escape(App.shortTime(run.finished_at))}</div>
      </div>
      <div class="run-card-metrics">${chips}</div>
    `;
    return card;
  },

  // 启用报告导航项（选中运行后）。
  enableReportNav() {
    const btn = document.querySelector('.nav-item[data-view="report"]');
    if (btn) btn.disabled = false;
  },

  // 根据分值返回 good/warn/bad/na 配色类。
  scoreClass(value) {
    if (value === null || value === undefined) return "na";
    if (value >= 0.8) return "good";
    if (value >= 0.65) return "warn";
    return "bad";
  },

  // 指标名缩写，节省卡片横向空间。
  shortMetric(name) {
    const map = {
      faithfulness: "faith.",
      answer_relevancy: "ans.rel.",
      context_recall: "ctx.recall",
      context_precision: "ctx.prec.",
    };
    return map[name] || name;
  },

  // 截取时间戳到分钟，便于阅读。
  shortTime(iso) {
    if (!iso) return "—";
    return String(iso).replace("T", " ").slice(0, 16);
  },

  // 简单 HTML 转义，防止注入。
  escape(text) {
    const div = document.createElement("div");
    div.textContent = text == null ? "" : String(text);
    return div.innerHTML;
  },

  // 健康检查，更新左下角状态点。
  async checkHealth() {
    const dot = document.getElementById("health-dot");
    const label = document.getElementById("health-text");
    try {
      await API.health();
      dot.className = "dot ok";
      label.textContent = "服务正常";
    } catch (_e) {
      dot.className = "dot bad";
      label.textContent = "服务离线";
    }
  },
};

document.addEventListener("DOMContentLoaded", App.init);