import { endpoints } from "./config.js";
import { trackEvent } from "./analytics.js";
import { requireFullAccess } from "./access.js";
import {
  buildBillRequestQueueMessage,
  buildWaiterCallQueueMessage,
  cacheOpenBills,
  ensureGuestActionAllowed,
  guestActionBlockedMessage,
  queueGuestAction,
  refreshGuestPendingActions,
} from "./queue.js";
import { showToast } from "./toast.js";
import {
  getBillState,
  getHashParam,
  getTableParam,
  setBillState,
} from "./state.js";

function sendApiSimulated(actionName, details) {
  console.log(`[SYMULACJA API] Akcja: ${actionName}`, details);
  // Przykładowe wysłanie docelowo:
  // if (window.socket && window.socket.readyState === WebSocket.OPEN) {
  //   window.socket.send(JSON.stringify({ action: "sendUpstream", payload: { type: actionName, table: tableParam, ...details } }));
  // }
}

export async function callWaiter(type) {
  if (type !== "order") return;

  if (!(await ensureGuestActionAllowed("waiter_call"))) {
    return;
  }

  const queued = await queueGuestAction("waiter_call", buildWaiterCallQueueMessage(), {
    waiterType: "order",
  });

  if (!queued.ok) {
    if (queued.reason === "pending") {
      showToast(guestActionBlockedMessage("waiter_call"));
    } else {
      showToast("Nie udało się wysłać wezwania. Spróbuj ponownie za chwilę.");
    }
    return;
  }

  trackEvent("waiter_call_requested", { waiterType: "order" });
  sendApiSimulated("CallWaiter_Order", { table: getTableParam() });
  showToast("Kelner wkrótce do Ciebie podejdzie!");
}

export function openWaiterDialog() {
  requireFullAccess("waiter", () => {
    openWaiterDialogInternal();
  });
}

export async function openWaiterDialogInternal() {
  if (!(await ensureGuestActionAllowed("waiter_call"))) {
    return;
  }
  document.getElementById("waiterModal").classList.add("active");
  document.body.style.overflow = "hidden";
}

export function closeWaiterDialog() {
  document.getElementById("waiterModal").classList.remove("active");
  document.body.style.overflow = "";
}

export async function confirmCallWaiter() {
  closeWaiterDialog();
  await callWaiter("order");
}

export async function proceedToBillPayment() {
  if (!(await ensureGuestActionAllowed("bill_request"))) {
    return;
  }
  goToStep("stepPayment");
}

export function openBillDialog() {
  requireFullAccess("bill", () => {
    openBillDialogInternal();
  });
}

export async function openBillDialogInternal() {
  await refreshGuestPendingActions();
  trackEvent("bill_dialog_opened");
  setBillState({ payment: "", doc: "", nip: "", company: null, selectedBillId: null });
  document.getElementById("billModal").classList.add("active");
  document.body.style.overflow = "hidden"; // Zablokuj scroll tła

  document.getElementById("billLoading").classList.remove("hidden");
  document.getElementById("billListContainer").classList.add("hidden");
  goToStep("stepBillList");

  try {
    const res = await fetch(`${endpoints.bills}?h=${encodeURIComponent(getHashParam())}`);
    const result = await res.json();

    if (result.status === "success" && result.data.length > 0) {
      const bills = result.data;
      cacheOpenBills(bills);

      if (bills.length === 1) {
        showBillReview(bills[0]);
        document.getElementById("btnBackToBills").style.display = "none";
      } else {
        renderBillList(bills);
        document.getElementById("btnBackToBills").style.display = "block";
      }
    } else {
      document.getElementById("billLoading").innerHTML = "Brak otwartych rachunków do opłacenia.";
    }
  } catch (err) {
    document.getElementById("billLoading").innerHTML = "Błąd pobierania rachunków.";
  }
}

function renderBillList(bills) {
  document.getElementById("billLoading").classList.add("hidden");
  document.getElementById("billListContainer").classList.remove("hidden");

  const container = document.getElementById("billListItems");
  container.innerHTML = "";

  bills.forEach((b) => {
    const div = document.createElement("div");
    div.className = "option-card";
    div.style.flexDirection = "row";
    div.style.justifyContent = "space-between";
    div.style.padding = "15px";
    div.onclick = () => showBillReview(b);

    const numerFormat = b.numer ? `#${b.numer}` : "Rachunek";
    div.innerHTML = `
          <div>
            <div style="font-weight:bold;">${numerFormat}</div>
            <div style="font-size:12px; color:var(--text-muted);">${b.opis}</div>
          </div>
          <div style="font-weight:bold; color:var(--primary);">${b.suma.toFixed(2)} PLN</div>
        `;
    container.appendChild(div);
  });
}

export function goBackToBillList() {
  goToStep("stepBillList");
}

export function showBillReview(bill) {
  const billState = getBillState();
  billState.selectedBillId = bill.id;

  const content = document.getElementById("billReviewContent");
  content.innerHTML = "";

  bill.pozycje.forEach((p) => {
    const div = document.createElement("div");
    div.style.display = "flex";
    div.style.justifyContent = "space-between";
    div.style.marginBottom = "8px";
    div.style.borderBottom = "1px solid rgba(255,255,255,0.05)";
    div.style.paddingBottom = "8px";

    div.innerHTML = `
          <div style="flex:1;">
            <div style="font-weight:600; font-size: 14px;">${p.nazwa}</div>
            <div style="font-size:12px; color:var(--text-muted);">${p.ilosc} x ${p.cena.toFixed(2)} PLN</div>
          </div>
          <div style="font-weight:600;">${p.wartosc.toFixed(2)} PLN</div>
        `;
    content.appendChild(div);
  });

  document.getElementById("billTotalAmount").textContent = bill.suma.toFixed(2) + " PLN";
  goToStep("stepBillReview");
}

export function closeBillDialog() {
  document.getElementById("billModal").classList.remove("active");
  document.body.style.overflow = ""; // Odblokuj scroll tła
}

export function goToStep(stepId) {
  document.querySelectorAll(".step").forEach((el) => el.classList.remove("active"));
  document.getElementById(stepId).classList.add("active");
}

export function selectPayment(method) {
  getBillState().payment = method;
  goToStep("stepDocument");
}

export async function selectDocument(docType) {
  const billState = getBillState();
  billState.doc = docType;
  if (docType === "paragon") {
    if (!(await ensureGuestActionAllowed("bill_request"))) {
      return;
    }
    const queued = await queueGuestAction("bill_request", buildBillRequestQueueMessage("paragon"), {
      payment: billState.payment || null,
      docType: "paragon",
    });
    if (!queued.ok) {
      if (queued.reason === "pending") {
        showToast(guestActionBlockedMessage("bill_request"));
      } else {
        showToast("Nie udało się wysłać prośby o rachunek. Spróbuj ponownie za chwilę.");
      }
      return;
    }
    trackEvent("bill_request_sent", { docType: "paragon" });
    closeBillDialog();
    sendApiSimulated("CallWaiter_Bill", {
      table: getTableParam(),
      billId: billState.selectedBillId,
      payment: billState.payment,
      doc: "paragon",
    });
    showToast("Kelner przyniesie paragon do opłacenia!");
  } else {
    goToStep("stepNIP");
    document.getElementById("nipInput").value = "";
    setTimeout(() => document.getElementById("nipInput").focus(), 100);
  }
}

export async function fetchGUS() {
  const nip = document.getElementById("nipInput").value.replace(/[\s-]/g, "");
  if (nip.length < 10) {
    alert("Wprowadź poprawny numer NIP.");
    return;
  }
  const btn = document.getElementById("btnGUS");
  btn.textContent = "Szukam...";
  btn.disabled = true;

  try {
    const response = await fetch(`${endpoints.gusLookup}?nip=${encodeURIComponent(nip)}`);
    const result = await response.json();

    if (result.status && result.data) {
      const data = result.data;

      let fullStreet = data.street || "";
      if (data.propertyNumber) fullStreet += " " + data.propertyNumber;
      if (data.apartmentNumber) fullStreet += "/" + data.apartmentNumber;

      const billState = getBillState();
      billState.nip = nip;
      billState.company = {
        name: data.name,
        street: fullStreet.trim(),
        zip: data.zipCode,
        city: data.city,
        nip: data.nip,
      };

      document.getElementById("cmpName").value = billState.company.name;
      document.getElementById("cmpStreet").value = billState.company.street;
      document.getElementById("cmpZip").value = billState.company.zip;
      document.getElementById("cmpCity").value = billState.company.city;
      document.getElementById("cmpNip").value = "NIP: " + billState.company.nip;

      // reset do readonly
      document.getElementById("cmpName").readOnly = true;
      document.getElementById("cmpStreet").readOnly = true;
      document.getElementById("cmpZip").readOnly = true;
      document.getElementById("cmpCity").readOnly = true;
      document.getElementById("btnEditCompany").textContent = "Popraw ręcznie";

      goToStep("stepVerify");
    } else {
      alert("Nie udało się pobrać danych z GUS dla podanego NIP-u.");
    }
  } catch (error) {
    console.error("Błąd pobierania danych z GUS:", error);
    alert("Błąd połączenia z API GUS.");
  } finally {
    btn.textContent = "Pobierz z GUS";
    btn.disabled = false;
  }
}

export function editCompanyData() {
  const n = document.getElementById("cmpName");
  const s = document.getElementById("cmpStreet");
  const z = document.getElementById("cmpZip");
  const c = document.getElementById("cmpCity");
  const btn = document.getElementById("btnEditCompany");

  if (n.readOnly) {
    n.readOnly = false;
    s.readOnly = false;
    z.readOnly = false;
    c.readOnly = false;
    n.focus();
    btn.textContent = "Zakończ edycję";
  } else {
    n.readOnly = true;
    s.readOnly = true;
    z.readOnly = true;
    c.readOnly = true;
    btn.textContent = "Popraw ręcznie";
  }
}

export async function confirmInvoice() {
  const billState = getBillState();
  billState.company.name = document.getElementById("cmpName").value;
  billState.company.street = document.getElementById("cmpStreet").value;
  billState.company.zip = document.getElementById("cmpZip").value;
  billState.company.city = document.getElementById("cmpCity").value;

  if (!(await ensureGuestActionAllowed("bill_request"))) {
    return;
  }

  const queued = await queueGuestAction("bill_request", buildBillRequestQueueMessage("faktura"), {
    payment: billState.payment || null,
    docType: "faktura",
    nip: billState.nip || null,
    company: billState.company || null,
  });

  if (!queued.ok) {
    if (queued.reason === "pending") {
      showToast(guestActionBlockedMessage("bill_request"));
    } else {
      showToast("Nie udało się wysłać prośby o rachunek. Spróbuj ponownie za chwilę.");
    }
    return;
  }

  closeBillDialog();
  trackEvent("bill_request_sent", { docType: "faktura" });
  sendApiSimulated("CallWaiter_Bill", {
    table: getTableParam(),
    billId: billState.selectedBillId,
    payment: billState.payment,
    doc: "faktura",
    nip: billState.nip,
    company: billState.company,
  });
  showToast("Dziękujemy! Prośba o fakturę została wysłana.");
}