(function () {
  "use strict";

  const root = document.getElementById("options-settings-root");
  if (!root) return;

  async function apiJson(url, opts) {
    const r = await fetch(url, Object.assign({ credentials: "same-origin" }, opts || {}));
    return r.json();
  }

  function setMsg(id, text, isErr) {
    const el = document.getElementById(id);
    if (!el) return;
    el.textContent = text || "";
    el.classList.toggle("opt-error", !!isErr);
  }

  function floorAmount(v) {
    const n = Number(v);
    if (!Number.isFinite(n) || n <= 0) return null;
    return Math.floor(n * 100) / 100;
  }

  async function loadBalances(force) {
    const q = force ? "?force=1" : "";
    const d = await apiJson("/api/options/balances" + q);
    if (!d.ok) throw new Error(d.msg || "余额拉取失败");
    return d;
  }

  function pickBalance(bal, account, ccy) {
    const acct = account === "trading" ? "trading" : "funding";
    const key = acct + "_" + String(ccy || "").toLowerCase();
    return floorAmount(bal[key]);
  }

  async function resolveMaxAmount(account, ccy) {
    const bal = await loadBalances(true);
    return pickBalance(bal, account, ccy);
  }

  async function submitSwap(amount) {
    const d = await apiJson("/api/options/spot/swap", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        direction: document.getElementById("opt-set-swap-dir").value,
        amount: amount,
      }),
    });
    setMsg("opt-set-swap-msg", d.ok ? "兑换单已提交" : (d.msg || "失败"), !d.ok);
    if (d.ok && typeof refreshAccountSnapshot === "function") refreshAccountSnapshot();
  }

  const swapBtn = document.getElementById("opt-set-swap-btn");
  if (swapBtn) {
    swapBtn.addEventListener("click", async function () {
      const amount = parseFloat(document.getElementById("opt-set-swap-amount").value);
      if (!amount || amount <= 0) {
        setMsg("opt-set-swap-msg", "请输入有效数量", true);
        return;
      }
      await submitSwap(amount);
    });
  }

  const swapAllBtn = document.getElementById("opt-set-swap-all-btn");
  if (swapAllBtn) {
    swapAllBtn.addEventListener("click", async function () {
      try {
        const dir = document.getElementById("opt-set-swap-dir").value;
        const ccy = dir === "usdc_to_usdt" ? "USDC" : "USDT";
        const amount = await resolveMaxAmount("funding", ccy);
        if (!amount) {
          setMsg("opt-set-swap-msg", "资金账户可用余额不足", true);
          return;
        }
        document.getElementById("opt-set-swap-amount").value = String(amount);
        await submitSwap(amount);
      } catch (e) {
        setMsg("opt-set-swap-msg", e.message || "余额拉取失败", true);
      }
    });
  }

  async function submitInternalTransfer(amount) {
    const d = await apiJson("/api/options/transfer", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        ccy: document.getElementById("opt-set-int-ccy").value,
        from: document.getElementById("opt-set-int-from").value,
        to: document.getElementById("opt-set-int-to").value,
        amount: amount,
      }),
    });
    setMsg("opt-set-int-msg", d.ok ? "划转成功" : (d.msg || "失败"), !d.ok);
    if (d.ok && typeof refreshAccountSnapshot === "function") refreshAccountSnapshot();
  }

  const intBtn = document.getElementById("opt-set-int-btn");
  if (intBtn) {
    intBtn.addEventListener("click", async function () {
      const amount = parseFloat(document.getElementById("opt-set-int-amount").value);
      if (!amount || amount <= 0) {
        setMsg("opt-set-int-msg", "请输入有效数量", true);
        return;
      }
      await submitInternalTransfer(amount);
    });
  }

  const intAllBtn = document.getElementById("opt-set-int-all-btn");
  if (intAllBtn) {
    intAllBtn.addEventListener("click", async function () {
      try {
        const ccy = document.getElementById("opt-set-int-ccy").value;
        const from = document.getElementById("opt-set-int-from").value;
        const amount = await resolveMaxAmount(from, ccy);
        if (!amount) {
          setMsg("opt-set-int-msg", "划出账户可用余额不足", true);
          return;
        }
        document.getElementById("opt-set-int-amount").value = String(amount);
        await submitInternalTransfer(amount);
      } catch (e) {
        setMsg("opt-set-int-msg", e.message || "余额拉取失败", true);
      }
    });
  }

  async function submitCrossTransfer(amount) {
    const d = await apiJson("/api/options/cross-transfer", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        ccy: document.getElementById("opt-set-cross-ccy").value,
        amount: amount,
        from_account: document.getElementById("opt-set-cross-from").value,
        to_account: document.getElementById("opt-set-cross-to").value,
        direction: document.getElementById("opt-set-cross-dir").value,
      }),
    });
    setMsg("opt-set-cross-msg", d.ok ? "划转成功" : (d.msg || "失败"), !d.ok);
    if (d.ok && typeof refreshAccountSnapshot === "function") refreshAccountSnapshot();
  }

  const crossBtn = document.getElementById("opt-set-cross-btn");
  if (crossBtn) {
    crossBtn.addEventListener("click", async function () {
      const amount = parseFloat(document.getElementById("opt-set-cross-amount").value);
      if (!amount || amount <= 0) {
        setMsg("opt-set-cross-msg", "请输入有效数量", true);
        return;
      }
      await submitCrossTransfer(amount);
    });
  }

  const crossAllBtn = document.getElementById("opt-set-cross-all-btn");
  if (crossAllBtn) {
    crossAllBtn.addEventListener("click", async function () {
      try {
        const ccy = document.getElementById("opt-set-cross-ccy").value;
        const from = document.getElementById("opt-set-cross-from").value;
        const amount = await resolveMaxAmount(from, ccy);
        if (!amount) {
          setMsg("opt-set-cross-msg", "划出账户可用余额不足", true);
          return;
        }
        document.getElementById("opt-set-cross-amount").value = String(amount);
        await submitCrossTransfer(amount);
      } catch (e) {
        setMsg("opt-set-cross-msg", e.message || "余额拉取失败", true);
      }
    });
  }
})();