(function () {
  "use strict";

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

  const state = {
    underlying: root.dataset.defaultUnderly || "ETH",
    optType: "C",
    chain: null,
    selectedInst: null,
    convertQuoteId: null,
  };

  function fmt(v, d) {
    if (v === null || v === undefined || Number.isNaN(Number(v))) return "—";
    return Number(v).toFixed(d == null ? 2 : d);
  }

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

  async function refreshBalances() {
    const d = await apiJson("/api/options/balances");
    if (!d.ok) return;
    document.getElementById("opt-funding-usdt").textContent = fmt(d.funding_usdt) + " U";
    document.getElementById("opt-funding-usdc").textContent = fmt(d.funding_usdc) + " U";
    document.getElementById("opt-trading-usdt").textContent = fmt(d.trading_usdt) + " U";
    document.getElementById("opt-trading-usdc").textContent = fmt(d.trading_usdc) + " U";
    document.getElementById("opt-trading-usdg").textContent = fmt(d.trading_usdg) + " U";
    document.getElementById("opt-trade-budget").textContent = fmt(d.trade_budget) + " USDC";
  }

  function expLabel(ms) {
    try {
      return new Date(Number(ms)).toLocaleString("zh-CN", { month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit" });
    } catch (e) {
      return String(ms);
    }
  }

  function renderExpiries() {
    const sel = document.getElementById("opt-exp-select");
    sel.innerHTML = '<option value="">选择到期日</option>';
    const exps = (state.chain && state.chain.expiries) || [];
    exps.forEach(function (e) {
      const o = document.createElement("option");
      o.value = String(e.exp_time);
      o.textContent = expLabel(e.exp_time) + " (" + e.contracts.length + ")";
      sel.appendChild(o);
    });
    document.getElementById("opt-index-line").textContent =
      "指数 " + state.underlying + " ≈ " + fmt(state.chain && state.chain.index_px, 2);
  }

  function renderStrikes() {
    const tbody = document.getElementById("opt-strike-tbody");
    const expMs = document.getElementById("opt-exp-select").value;
    tbody.innerHTML = "";
    if (!expMs || !state.chain) {
      tbody.innerHTML = '<tr><td colspan="5" class="muted">请选择到期日</td></tr>';
      return;
    }
    const exp = (state.chain.expiries || []).find(function (e) {
      return String(e.exp_time) === String(expMs);
    });
    if (!exp) return;
    const list = (exp.contracts || []).filter(function (c) {
      return c.opt_type === state.optType;
    });
    if (!list.length) {
      tbody.innerHTML = '<tr><td colspan="5" class="muted">无符合的实值合约</td></tr>';
      return;
    }
    list.forEach(function (c) {
      const tr = document.createElement("tr");
      tr.innerHTML =
        "<td>" + c.strike + "</td>" +
        "<td><code>" + c.inst_id + "</code></td>" +
        "<td>" + fmt(c.ask, 4) + "</td>" +
        "<td>" + fmt(c.bid, 4) + "</td>" +
        '<td><button type="button" class="btn-secondary opt-pick-btn" data-inst="' + c.inst_id + '">选择</button></td>';
      tbody.appendChild(tr);
    });
    tbody.querySelectorAll(".opt-pick-btn").forEach(function (btn) {
      btn.addEventListener("click", function () {
        selectContract(btn.getAttribute("data-inst"));
      });
    });
  }

  async function selectContract(instId) {
    state.selectedInst = instId;
    const mode = document.querySelector('input[name="opt-size-mode"]:checked').value;
    const ethInput = document.getElementById("opt-eth-amount");
    let url = "/api/options/quote?inst_id=" + encodeURIComponent(instId) + "&mode=" + mode;
    if (mode === "eth_amount" && ethInput.value) {
      url += "&eth_amount=" + encodeURIComponent(ethInput.value);
    }
    const d = await apiJson(url);
    const panel = document.getElementById("opt-order-panel");
    panel.style.display = "";
    document.getElementById("opt-order-inst").textContent = instId;
    document.getElementById("opt-order-ask").textContent = fmt(d.ask, 4);
    const sz = d.sizing || {};
    document.getElementById("opt-order-sheets").textContent = sz.sheets != null ? sz.sheets : "—";
    document.getElementById("opt-order-eth").textContent = sz.eth_amount != null ? sz.eth_amount : "—";
    document.getElementById("opt-order-premium").textContent = sz.total_premium != null ? fmt(sz.total_premium, 4) + " USDC" : "—";
    document.getElementById("opt-order-msg").textContent = sz.ok === false ? (sz.msg || "") : "";
  }

  async function loadChain() {
    const d = await apiJson("/api/options/chain?underlying=" + encodeURIComponent(state.underlying));
    if (!d.ok) {
      alert(d.msg || "加载失败");
      return;
    }
    state.chain = d;
    renderExpiries();
    renderStrikes();
  }

  async function openPosition() {
    if (!state.selectedInst) return;
    const mode = document.querySelector('input[name="opt-size-mode"]:checked').value;
    const body = {
      inst_id: state.selectedInst,
      mode: mode,
      signal_note: document.getElementById("opt-signal-note").value || "",
    };
    if (mode === "eth_amount") {
      body.eth_amount = parseFloat(document.getElementById("opt-eth-amount").value);
    }
    const d = await apiJson("/api/options/open", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(body),
    });
    document.getElementById("opt-order-msg").textContent = d.ok ? "下单已提交" : (d.msg || "失败");
    if (d.ok) {
      refreshBalances();
      refreshPositions();
    }
  }

  async function refreshPositions() {
    const d = await apiJson("/api/options/positions");
    const tbody = document.getElementById("opt-positions-tbody");
    tbody.innerHTML = "";
    const list = (d.ok && d.positions) || [];
    if (!list.length) {
      tbody.innerHTML = '<tr><td colspan="8" class="muted">暂无持仓</td></tr>';
      return;
    }
    list.forEach(function (p) {
      const tr = document.createElement("tr");
      tr.innerHTML =
        "<td><code>" + (p.inst_id || "") + "</code></td>" +
        "<td>" + fmt(p.pos, 0) + "</td>" +
        "<td>" + fmt(p.eth_amount, 4) + "</td>" +
        "<td>" + fmt(p.avg_px, 4) + "</td>" +
        "<td>" + fmt(p.mark_px, 4) + "</td>" +
        "<td>" + fmt(p.upl, 4) + "</td>" +
        "<td>" + (p.upl_ratio_pct != null ? p.upl_ratio_pct + "%" : "—") + "</td>" +
        '<td><button type="button" class="btn-primary opt-close-btn" data-inst="' + p.inst_id + '">限价平仓</button></td>';
      tbody.appendChild(tr);
    });
    tbody.querySelectorAll(".opt-close-btn").forEach(function (btn) {
      btn.addEventListener("click", async function () {
        const inst = btn.getAttribute("data-inst");
        if (!confirm("确认限价卖出 @ 买一？")) return;
        const r = await apiJson("/api/options/close", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ inst_id: inst }),
        });
        alert(r.ok ? "平仓单已提交" : (r.msg || "失败"));
        refreshPositions();
        refreshBalances();
      });
    });
  }

  document.querySelectorAll(".opt-uly-btn").forEach(function (btn) {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".opt-uly-btn").forEach(function (b) { b.classList.remove("active"); });
      btn.classList.add("active");
      state.underlying = btn.getAttribute("data-uly");
      loadChain();
    });
  });

  document.querySelectorAll(".opt-type-btn").forEach(function (btn) {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".opt-type-btn").forEach(function (b) { b.classList.remove("active"); });
      btn.classList.add("active");
      state.optType = btn.getAttribute("data-type");
      renderStrikes();
    });
  });

  document.getElementById("opt-exp-select").addEventListener("change", renderStrikes);
  document.getElementById("opt-load-chain").addEventListener("click", loadChain);
  document.getElementById("opt-refresh-balances").addEventListener("click", refreshBalances);
  document.getElementById("opt-refresh-positions").addEventListener("click", refreshPositions);
  document.getElementById("opt-open-btn").addEventListener("click", openPosition);

  document.querySelectorAll('input[name="opt-size-mode"]').forEach(function (r) {
    r.addEventListener("change", function () {
      document.getElementById("opt-eth-amount").style.display =
        r.value === "eth_amount" && r.checked ? "" : "none";
      if (state.selectedInst) selectContract(state.selectedInst);
    });
  });

  document.getElementById("opt-convert-quote-btn").addEventListener("click", async function () {
    const amount = parseFloat(document.getElementById("opt-convert-amount").value);
    if (!amount || amount <= 0) {
      alert("请输入 USDT 数量");
      return;
    }
    const d = await apiJson("/api/options/convert/quote", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ amount: amount }),
    });
    const prev = document.getElementById("opt-convert-preview");
    if (!d.ok) {
      prev.textContent = d.msg || "询价失败";
      state.convertQuoteId = null;
      document.getElementById("opt-convert-exec-btn").disabled = true;
      return;
    }
    state.convertQuoteId = d.quote_id;
    prev.textContent =
      "预估获得 " + fmt(d.base_sz, 6) + " USDC，汇率 " + fmt(d.cnvt_px, 6);
    document.getElementById("opt-convert-exec-btn").disabled = false;
  });

  document.getElementById("opt-convert-exec-btn").addEventListener("click", async function () {
    if (!state.convertQuoteId) return;
    const amount = parseFloat(document.getElementById("opt-convert-amount").value);
    const d = await apiJson("/api/options/convert/execute", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ quote_id: state.convertQuoteId, rfq_sz: amount }),
    });
    document.getElementById("opt-convert-preview").textContent = d.ok ? "兑换成功" : (d.msg || "失败");
    state.convertQuoteId = null;
    document.getElementById("opt-convert-exec-btn").disabled = true;
    refreshBalances();
  });

  document.getElementById("opt-transfer-btn").addEventListener("click", async function () {
    const d = await apiJson("/api/options/transfer", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        ccy: document.getElementById("opt-transfer-ccy").value,
        from: document.getElementById("opt-transfer-from").value,
        to: document.getElementById("opt-transfer-to").value,
        amount: parseFloat(document.getElementById("opt-transfer-amount").value),
      }),
    });
    document.getElementById("opt-transfer-msg").textContent = d.ok ? "划转成功" : (d.msg || "失败");
    refreshBalances();
  });

  refreshBalances();
  loadChain();
  refreshPositions();
})();