// HelcimPay.js integration composable
export const useHelcimPay = () => {
  let checkoutToken = null;
  let secretToken = null;

  // Initialize HelcimPay.js session
  const initializeHelcimPay = async (customerId, customerCode, amount = 0) => {
    try {
      const response = await $fetch("/api/helcim/initialize-payment", {
        method: "POST",
        body: {
          customerId,
          customerCode,
          amount,
        },
      });

      if (response.success) {
        checkoutToken = response.checkoutToken;
        secretToken = response.secretToken;
        return true;
      }

      throw new Error("Failed to initialize payment session");
    } catch (error) {
      console.error("Payment initialization error:", error);
      throw error;
    }
  };

  // Initialize payment for event ticket purchase
  const initializeTicketPayment = async (
    eventId,
    email,
    amount,
    eventTitle = null,
  ) => {
    try {
      const response = await $fetch("/api/helcim/initialize-payment", {
        method: "POST",
        body: {
          customerId: null,
          customerCode: email, // Use email as customer code for event tickets
          amount,
          metadata: {
            type: "event_ticket",
            eventId,
            email,
            eventTitle,
          },
        },
      });

      if (response.success) {
        checkoutToken = response.checkoutToken;
        secretToken = response.secretToken;
        return {
          success: true,
          checkoutToken: response.checkoutToken,
        };
      }

      throw new Error("Failed to initialize ticket payment session");
    } catch (error) {
      console.error("Ticket payment initialization error:", error);
      throw error;
    }
  };

  // Show payment modal
  const showPaymentModal = () => {
    return new Promise((resolve, reject) => {
      if (!checkoutToken) {
        reject(
          new Error("Payment not initialized. Call initializeHelcimPay first."),
        );
        return;
      }

      // Add CSS to style Helcim overlay - needs to target the actual elements Helcim creates
      // Helcim injects a div with inline styles directly into body
      if (!document.getElementById("helcim-overlay-fix")) {
        const style = document.createElement("style");
        style.id = "helcim-overlay-fix";
        style.textContent = `
          /* Style any fixed position div that Helcim creates */
          body > div[style] {
            background-color: rgba(0, 0, 0, 0.75) !important;
          }

          /* Target specifically iframes from Helcim */
          body > div[style] > iframe[src*="helcim"],
          body > div[style] iframe[src*="secure.helcim.app"] {
            background: white !important;
            border: none !important;
            border-radius: 8px !important;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3) !important;
          }
        `;
        document.head.appendChild(style);
      }

      // Load HelcimPay.js modal script
      if (!window.appendHelcimPayIframe) {
        console.log("HelcimPay script not loaded, loading now...");
        const script = document.createElement("script");
        script.src = "https://secure.helcim.app/helcim-pay/services/start.js";
        script.async = true;
        script.onload = () => {
          console.log("HelcimPay script loaded successfully!");
          console.log(
            "Available functions:",
            Object.keys(window).filter(
              (key) => key.includes("Helcim") || key.includes("helcim"),
            ),
          );
          console.log(
            "appendHelcimPayIframe available:",
            typeof window.appendHelcimPayIframe,
          );
          openModal(resolve, reject);
        };
        script.onerror = () => {
          reject(new Error("Failed to load HelcimPay.js"));
        };
        document.head.appendChild(script);
      } else {
        console.log("HelcimPay script already loaded, calling openModal");
        openModal(resolve, reject);
      }
    });
  };

  // Open the payment modal
  const openModal = (resolve, reject) => {
    try {
      console.log("Trying to open modal with checkoutToken:", checkoutToken);

      if (typeof window.appendHelcimPayIframe === "function") {
        // Set up event listener for HelcimPay.js responses
        const helcimPayJsIdentifierKey = "helcim-pay-js-" + checkoutToken;

        const handleHelcimPayEvent = (event) => {
          console.log("Received window message:", event.data);

          if (event.data.eventName === helcimPayJsIdentifierKey) {
            console.log("HelcimPay event received:", event.data);

            // Remove event listener to prevent multiple responses
            window.removeEventListener("message", handleHelcimPayEvent);

            // Close the Helcim modal
            if (typeof window.removeHelcimPayIframe === "function") {
              window.removeHelcimPayIframe();
            }

            if (event.data.eventStatus === "SUCCESS") {
              console.log("Payment success:", event.data.eventMessage);

              // Parse the JSON string eventMessage
              let paymentData;
              try {
                paymentData = JSON.parse(event.data.eventMessage);
                console.log("Parsed payment data:", paymentData);
              } catch (parseError) {
                console.error("Failed to parse eventMessage:", parseError);
                reject(new Error("Invalid payment response format"));
                return;
              }

              // Extract transaction details from nested data structure
              const transactionData = paymentData.data?.data || {};
              console.log("Transaction data:", transactionData);

              resolve({
                success: true,
                transactionId: transactionData.transactionId,
                cardToken: transactionData.cardToken,
                cardLast4: transactionData.cardNumber
                  ? transactionData.cardNumber.slice(-4)
                  : undefined,
                cardType: transactionData.cardType || "unknown",
              });
            } else if (event.data.eventStatus === "ABORTED") {
              console.log("Payment aborted:", event.data.eventMessage);
              reject(new Error(event.data.eventMessage || "Payment failed"));
            } else if (event.data.eventStatus === "HIDE") {
              console.log("Modal closed without completion");
              reject(new Error("Payment cancelled by user"));
            }
          }
        };

        // Add event listener
        window.addEventListener("message", handleHelcimPayEvent);

        // Set up a MutationObserver to fix Helcim's overlay styling immediately
        const observer = new MutationObserver((mutations) => {
          mutations.forEach((mutation) => {
            mutation.addedNodes.forEach((node) => {
              if (node.nodeType === 1 && node.tagName === "DIV") {
                const computedStyle = window.getComputedStyle(node);
                // Check if this is Helcim's overlay (fixed position, full screen)
                if (
                  computedStyle.position === "fixed" &&
                  computedStyle.inset === "0px"
                ) {
                  // Fix the background to show semi-transparent overlay
                  node.style.setProperty(
                    "background-color",
                    "rgba(0, 0, 0, 0.75)",
                    "important",
                  );
                  // Ensure proper centering
                  node.style.setProperty("display", "flex", "important");
                  node.style.setProperty("align-items", "center", "important");
                  node.style.setProperty(
                    "justify-content",
                    "center",
                    "important",
                  );
                  observer.disconnect(); // Stop observing once we've found and fixed it
                }
              }
            });
          });
        });

        // Start observing body for child additions
        observer.observe(document.body, { childList: true });

        // Open the HelcimPay iframe modal
        console.log("Calling appendHelcimPayIframe with token:", checkoutToken);
        window.appendHelcimPayIframe(checkoutToken, true);
        console.log(
          "appendHelcimPayIframe called, waiting for window messages...",
        );

        // Clean up observer after a timeout
        setTimeout(() => observer.disconnect(), 5000);

        // Add timeout to clean up if no response
        setTimeout(() => {
          console.log("60 seconds passed, cleaning up event listener...");
          window.removeEventListener("message", handleHelcimPayEvent);
          reject(new Error("Payment timeout - no response received"));
        }, 60000);
      } else {
        reject(new Error("appendHelcimPayIframe function not available"));
      }
    } catch (error) {
      console.error("Error opening modal:", error);
      reject(error);
    }
  };

  // Process payment verification
  const verifyPayment = async () => {
    try {
      return await showPaymentModal();
    } catch (error) {
      throw error;
    }
  };

  // Cleanup tokens
  const cleanup = () => {
    checkoutToken = null;
    secretToken = null;
  };

  return {
    initializeHelcimPay,
    initializeTicketPayment,
    verifyPayment,
    cleanup,
  };
};