(() => {
  "use strict";
  const form = document.querySelector("[data-start-purchases]");
  if (!form) return;
  const all = form.querySelector("[data-select-all]");
  const summary = form.querySelector("[data-selection-summary]");
  const button = form.querySelector("[data-start-button]");
  const feedback = form.querySelector("[data-start-feedback]");
  const boxes = () => [...form.querySelectorAll("input[data-task-id]")];
  let selectionFrozen = false;
  const parseCents = (value) => {
    const match = /^(0|[1-9]\d*)\.(\d{2})$/.exec(value);
    return match ? BigInt(match[1] + match[2]) : null;
  };
  const refresh = () => {
    const available = boxes();
    const selected = available.filter((box) => box.checked);
    let cents = 0n;
    let pricesValid = true;
    selected.forEach((box) => {
      const price = parseCents(box.dataset.price);
      if (price === null) pricesValid = false;
      else cents += price;
    });
    summary.textContent = `已选 ${selected.length} 条，最高总额 ¥${cents / 100n}.${(cents % 100n).toString().padStart(2, "0")}`;
    button.disabled = !selected.length || !pricesValid;
    if (!pricesValid) feedback.textContent = "所选任务金额无法安全汇总，请刷新后重选。";
    if (all) {
      all.checked = selected.length > 0 && selected.length === available.length;
      all.indeterminate = selected.length > 0 && selected.length < available.length;
      all.disabled = selectionFrozen || available.length === 0;
    }
  };
  const freezeSelection = (frozen) => {
    selectionFrozen = frozen;
    boxes().forEach((box) => { box.disabled = frozen; });
    refresh();
  };
  boxes().forEach((box) => box.addEventListener("change", refresh));
  if (all) all.addEventListener("change", () => { boxes().forEach((box) => { box.checked = all.checked; }); refresh(); });
  let frozenPayload = null;
  let inFlight = false;
  form.addEventListener("submit", async (event) => {
    event.preventDefault();
    const selected = boxes().filter((box) => box.checked);
    if (!selected.length || inFlight) return;
    const tasks = selected.map((box) => ({task_id: box.dataset.taskId, expected_task_version: Number(box.dataset.taskVersion)}));
    if (tasks.some((item) => !Number.isSafeInteger(item.expected_task_version) || item.expected_task_version < 1)) { feedback.textContent = "任务版本无效，请刷新后重选。"; return; }
    frozenPayload = frozenPayload || JSON.stringify({start_key: form.dataset.startKey, tasks});
    inFlight = true; freezeSelection(true); button.disabled = true; button.textContent = "正在授权…";
    try { const response = await fetch("/tasks/start-purchases", {method:"POST", headers:{"Content-Type":"application/json", "X-CSRF-Token":form.dataset.csrf}, body:frozenPayload});
      if (response.ok) { window.location.reload(); return; }
      if (response.status === 409) { feedback.textContent = "任务已变化，请刷新后重选。"; frozenPayload = null; freezeSelection(false); boxes().forEach((box) => { box.checked = false; }); refresh(); return; }
      if (response.status === 400 || response.status === 401 || response.status === 403) { feedback.textContent = "请求未被接受，请刷新页面后重试。"; frozenPayload = null; freezeSelection(false); return; }
      feedback.textContent = "结果暂时不明确，只能使用同一按钮原样重放。";
    } catch (_) { feedback.textContent = "网络结果不明确，请使用同一按钮原样重试。"; }
    finally { inFlight = false; button.textContent = "开始采购（只创建待付款订单）"; if (frozenPayload) button.disabled = false; }
  });
  refresh();
})();