(function () {
  function formatAmount(n) {
    return n.toFixed(2);
  }

  function showMessage(el, text, kind) {
    el.textContent = text;
    el.className = "form-message " + kind;
    el.hidden = false;
  }

  async function extractErrorDetail(response) {
    try {
      const body = await response.json();
      if (typeof body.detail === "string") return body.detail;
      if (Array.isArray(body.detail)) {
        return body.detail.map((e) => e.msg || JSON.stringify(e)).join(", ");
      }
      return JSON.stringify(body.detail);
    } catch (err) {
      return "Der skete en fejl. Prøv igen.";
    }
  }

  const orderForm = document.getElementById("order-form");
  if (orderForm) {
    const qtyInputs = Array.from(orderForm.querySelectorAll(".qty-input"));
    const totalEurEl = document.getElementById("total-eur");
    const totalDkkEl = document.getElementById("total-dkk");
    const rateAttr = orderForm.dataset.eurDkkRate;
    const rate = rateAttr ? parseFloat(rateAttr) : null;

    function recalculate() {
      let totalEur = 0;
      qtyInputs.forEach((input) => {
        const qty = parseInt(input.value, 10) || 0;
        const price = parseFloat(input.dataset.price) || 0;
        const rowTotal = qty * price;
        totalEur += rowTotal;
        const cell = orderForm.querySelector(
          '[data-row-total-for="' + input.dataset.offeringId + '"]'
        );
        if (cell) cell.textContent = formatAmount(rowTotal);
      });
      if (totalEurEl) totalEurEl.textContent = formatAmount(totalEur);
      if (totalDkkEl && rate) totalDkkEl.textContent = formatAmount(totalEur * rate);
    }

    qtyInputs.forEach((input) => input.addEventListener("input", recalculate));
    recalculate();

    orderForm.addEventListener("submit", async function (event) {
      event.preventDefault();
      const messageEl = document.getElementById("order-message");
      const orderLines = qtyInputs
        .map((input) => ({
          wine_offering_id: parseInt(input.dataset.offeringId, 10),
          quantity: parseInt(input.value, 10) || 0,
        }))
        .filter((line) => line.quantity > 0);

      if (orderLines.length === 0) {
        showMessage(messageEl, "Vælg mindst én vin med et antal større end 0.", "error");
        return;
      }

      const payload = {
        participant: {
          name: orderForm.elements["name"].value,
          email: orderForm.elements["email"].value,
          phone: orderForm.elements["phone"].value,
          is_active: orderForm.elements["is_active"].checked,
        },
        order_lines: orderLines,
      };

      try {
        const response = await fetch("/public/orders", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify(payload),
        });
        if (response.ok) {
          window.location.href = "/bestilling-modtaget";
          return;
        } else {
          showMessage(messageEl, await extractErrorDetail(response), "error");
        }
      } catch (err) {
        showMessage(messageEl, "Kunne ikke sende bestillingen. Tjek din internetforbindelse og prøv igen.", "error");
      }
    });
  }

  const signupForm = document.getElementById("signup-form");
  if (signupForm) {
    signupForm.addEventListener("submit", async function (event) {
      event.preventDefault();
      const messageEl = document.getElementById("signup-message");
      const payload = {
        name: signupForm.elements["name"].value,
        email: signupForm.elements["email"].value,
      };

      try {
        const response = await fetch("/public/signup", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify(payload),
        });
        if (response.ok) {
          signupForm.querySelectorAll("label, button[type=submit]").forEach((el) => {
            el.hidden = true;
          });
          showMessage(messageEl, "Tak! Du er nu tilmeldt.", "success");
        } else {
          showMessage(messageEl, await extractErrorDetail(response), "error");
        }
      } catch (err) {
        showMessage(messageEl, "Kunne ikke sende tilmeldingen. Tjek din internetforbindelse og prøv igen.", "error");
      }
    });
  }
})();