(function () {
  "use strict";

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

  const SWAP_BTNS = ["opt-set-swap-btn", "opt-set-swap-all-btn"];
  const INT_BTNS = ["opt-set-int-btn", "opt-set-int-all-btn"];

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

  function refreshFundsAfterMutation() {
    if (typeof refreshAccountSnapshot !== "function") return;
    refreshAccountSnapshot({ force: true });
    setTimeout(function () {
      refreshAccountSnapshot({ force: true, silent: true });
    }, 1500);
  }

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

  function fmtAmt(amount, ccy) {
    return `${Number(amount).toFixed(2)} ${ccy}`;
  }

  function accountLabel(acct) {
    return acct === "trading" ? "交易账户" : "资金账户";
  }

  function swapDirLabel(dir) {
    return dir === "usdc_to_usdt" ? "USDC → USDT" : "USDT → USDC";
  }

  function confirmOk(message) {
    return window.confirm(message);
  }

  function setButtonsBusy(btnIds, busy, busyText) {
    btnIds.forEach(function (id) {
      const btn = document.getElementById(id);
      if (!btn) return;
      if (busy) {
        if (!btn.dataset.origText) btn.dataset.origText = btn.textContent;
        btn.disabled = true;
        if (busyText) btn.textContent = busyText;
      } else {
        btn.disabled = false;
        if (btn.dataset.origText) {
          btn.textContent = btn.dataset.origText;
          delete btn.dataset.origText;
        }
      }
    });
    const amountIds = {
      "opt-set-swap-btn": "opt-set-swap-amount",
      "opt-set-swap-all-btn": "opt-set-swap-amount",
      "opt-set-int-btn": "opt-set-int-amount",
      "opt-set-int-all-btn": "opt-set-int-amount",
      "opt-set-cross-btn": "opt-set-cross-amount",
      "opt-set-cross-all-btn": "opt-set-cross-amount",
    };
    btnIds.forEach(function (id) {
      const input = document.getElementById(amountIds[id]);
      if (input) input.disabled = busy;
    });
  }

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

  async function loadBalances(force, scope) {
    const parts = [];
    if (force) parts.push("force=1");
    if (scope && scope !== "main") parts.push("scope=" + encodeURIComponent(scope));
    const q = parts.length ? "?" + parts.join("&") : "";
    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 c = String(ccy || "").toLowerCase();
    const availKey = acct + "_" + c + "_avail";
    const totalKey = acct + "_" + c;
    return roundAvail(bal[availKey] != null ? bal[availKey] : bal[totalKey]);
  }

  async function resolveSwapMaxAmount(dir) {
    const bal = await loadBalances(true, "main");
    const ccy = dir === "usdc_to_usdt" ? "USDC" : "USDT";
    // 币种兑换走资金账户现货;统一账户下 USDT 有时在交易户,市价单仍可能成交
    let amount = pickBalance(bal, "funding", ccy);
    let source = "funding";
    if (!amount && ccy === "USDT") {
      const tradingAmt = pickBalance(bal, "trading", ccy);
      if (tradingAmt) {
        amount = tradingAmt;
        source = "trading";
      }
    }
    return { amount, bal, ccy, source };
  }

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

  async function submitSwap(amount) {
    setButtonsBusy(SWAP_BTNS, true, "兑换中…");
    setMsg("opt-set-swap-msg", "兑换中，市价成交可能有延时…", false);
    try {
      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,
        }),
      });
      if (d.ok) {
        setMsg("opt-set-swap-msg", "兑换成功", false);
        refreshFundsAfterMutation();
      } else {
        setMsg("opt-set-swap-msg", "兑换失败：" + (d.msg || "未知错误"), true);
      }
      return d;
    } catch (e) {
      setMsg("opt-set-swap-msg", "兑换失败：" + (e.message || "网络错误"), true);
      return { ok: false };
    } finally {
      setButtonsBusy(SWAP_BTNS, false);
    }
  }

  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 { amount, bal, ccy, source } = await resolveSwapMaxAmount(dir);
        if (!amount) {
          const fu = bal.funding_usdt_avail != null ? bal.funding_usdt_avail : bal.funding_usdt;
          const tu = bal.trading_usdt_avail != null ? bal.trading_usdt_avail : bal.trading_usdt;
          const fc = bal.funding_usdc_avail != null ? bal.funding_usdc_avail : bal.funding_usdc;
          setMsg(
            "opt-set-swap-msg",
            "资金账户可用 " +
              ccy +
              " 不足(资金户 USDT:" +
              (fu != null ? fu : "—") +
              " USDC:" +
              (fc != null ? fc : "—") +
              "; 交易户 USDT:" +
              (tu != null ? tu : "—") +
              ")",
            true
          );
          return;
        }
        const srcLabel = source === "trading" ? "交易账户" : "资金账户";
        const msg =
          "确认全部兑换？\n\n" +
          "方向：" + swapDirLabel(dir) + "\n" +
          "金额：" + fmtAmt(amount, ccy) + "\n" +
          "来源：" + srcLabel + "\n\n" +
          "将按该账户可用余额发起市价兑换(可能有延时)。请确认。";
        if (!confirmOk(msg)) return;
        document.getElementById("opt-set-swap-amount").value = String(amount);
        await submitSwap(amount);
      } catch (e) {
        setMsg("opt-set-swap-msg", "兑换失败：" + (e.message || "余额拉取失败"), true);
      }
    });
  }

  async function submitInternalTransfer(amount) {
    setButtonsBusy(INT_BTNS, true, "划转中…");
    setMsg("opt-set-int-msg", "划转中…", false);
    try {
      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,
        }),
      });
      if (d.ok) {
        setMsg("opt-set-int-msg", "划转成功", false);
        refreshFundsAfterMutation();
      } else {
        setMsg("opt-set-int-msg", "划转失败：" + (d.msg || "未知错误"), true);
      }
      return d;
    } catch (e) {
      setMsg("opt-set-int-msg", "划转失败：" + (e.message || "网络错误"), true);
      return { ok: false };
    } finally {
      setButtonsBusy(INT_BTNS, false);
    }
  }

  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 to = document.getElementById("opt-set-int-to").value;
        const amount = await resolveMaxAmount(from, ccy, "main");
        if (!amount) {
          setMsg("opt-set-int-msg", "划出账户可用余额不足", true);
          return;
        }
        const msg =
          "确认全部划转？\n\n" +
          "币种：" + ccy + "\n" +
          "划出：" + accountLabel(from) + "\n" +
          "划入：" + accountLabel(to) + "\n" +
          "金额：" + fmtAmt(amount, ccy) + "\n\n" +
          "将划转该账户全部可用余额。";
        if (!confirmOk(msg)) return;
        document.getElementById("opt-set-int-amount").value = String(amount);
        await submitInternalTransfer(amount);
      } catch (e) {
        setMsg("opt-set-int-msg", "划转失败：" + (e.message || "余额拉取失败"), true);
      }
    });
  }

  function hardenAmountAutofill(ids) {
    ids.forEach(function (id) {
      const el = document.getElementById(id);
      if (!el) return;
      function wipe() {
        const v = String(el.value || "").trim();
        if (/^[a-z][a-z0-9._-]{1,31}$/i.test(v)) el.value = "";
      }
      wipe();
      el.setAttribute("readonly", "readonly");
      el.addEventListener("focus", function () {
        el.removeAttribute("readonly");
      });
      el.addEventListener("blur", function () {
        if (!el.value) el.setAttribute("readonly", "readonly");
      });
      setTimeout(wipe, 200);
      setTimeout(wipe, 800);
      setTimeout(wipe, 2000);
    });
  }

  // 全部划转/兑换前去掉 readonly,避免写不进数量
  ["opt-set-swap-all-btn", "opt-set-int-all-btn"].forEach(function (btnId) {
    const btn = document.getElementById(btnId);
    if (!btn) return;
    btn.addEventListener(
      "click",
      function () {
        const map = {
          "opt-set-swap-all-btn": "opt-set-swap-amount",
          "opt-set-int-all-btn": "opt-set-int-amount",
        };
        const input = document.getElementById(map[btnId]);
        if (input) input.removeAttribute("readonly");
      },
      true
    );
  });

  hardenAmountAutofill(["opt-set-swap-amount", "opt-set-int-amount"]);
})();