// Import the component loader and page utilities
import { importComponent } from "/js/components.js";
import { callJsExtensions } from "/js/extensions.js";

// Modal functionality
const modalStack = [];

function sameModalPath(left = "", right = "") {
  return String(left || "").replace(/^\/+/, "") === String(right || "").replace(/^\/+/, "");
}

function modalHasClass(modalOrElement, className) {
  const element = modalOrElement?.element || modalOrElement;
  return Boolean(
    element?.classList?.contains(className)
      || element?.querySelector?.(".modal-inner")?.classList?.contains(className)
  );
}

function modalDatasetFlag(modalOrElement, name) {
  const element = modalOrElement?.element || modalOrElement;
  const inner = element?.querySelector?.(".modal-inner");
  const value = element?.dataset?.[name] ?? inner?.dataset?.[name] ?? "";
  return ["1", "true", "yes", "on"].includes(String(value).trim().toLowerCase());
}

function modalRequiresExplicitClose(modalOrElement) {
  return modalHasClass(modalOrElement, "modal-explicit-close")
    || modalDatasetFlag(modalOrElement, "modalExplicitClose");
}

function modalSuppressesBackdrop(modalOrElement) {
  return modalHasClass(modalOrElement, "modal-no-backdrop")
    || modalDatasetFlag(modalOrElement, "modalNoBackdrop");
}

function dispatchModalEvent(name, modal, detail = {}) {
  document.dispatchEvent(
    new CustomEvent(name, {
      detail: {
        modalPath: modal?.path ?? null,
        modal,
        modalStack: getModalStack(),
        ...detail,
      },
    }),
  );
}

function activateModal(modal) {
  if (!modal) return;
  updateModalZIndexes();
  restoreModalScrollSnapshot(modal);
  dispatchModalEvent("modal-activated", modal);
}

function findModalIndexByPath(modalPath) {
  return modalStack.findIndex((modal) => sameModalPath(modal.path, modalPath));
}

function focusModal(modalPath) {
  const modalIndex = findModalIndexByPath(modalPath);
  if (modalIndex === -1) return false;
  const currentTopModal = modalStack[modalStack.length - 1];
  if (currentTopModal) {
    currentTopModal.savedScrollSnapshot = captureModalScrollSnapshot(currentTopModal);
  }
  const [modal] = modalStack.splice(modalIndex, 1);
  modalStack.push(modal);
  activateModal(modal);
  return true;
}

function getModalScrollElement(modal) {
  return modal?.element?.querySelector(".modal-scroll");
}

function captureModalScrollSnapshot(modal) {
  const modalScroll = getModalScrollElement(modal);
  if (!modalScroll) return null;
  return {
    scrollTop: modalScroll.scrollTop,
    scrollLeft: modalScroll.scrollLeft,
  };
}

function restoreModalScrollSnapshot(modal) {
  const snapshot = modal?.savedScrollSnapshot;
  if (!snapshot) return;

  requestAnimationFrame(() => {
    const modalScroll = getModalScrollElement(modal);
    if (!modalScroll) return;
    modalScroll.scrollTop = snapshot.scrollTop;
    modalScroll.scrollLeft = snapshot.scrollLeft;
    modal.savedScrollSnapshot = null;
  });
}

// Create a single backdrop for all modals
const backdrop = document.createElement("div");
backdrop.className = "modal-backdrop";
backdrop.style.display = "none";
backdrop.style.backdropFilter = "blur(8px) saturate(112%)";
document.body.appendChild(backdrop);

// Function to update z-index for all modals and backdrop
function updateModalZIndexes() {
  // Base z-index for modals
  const baseZIndex = 3000;

  // Update z-index for all modals
  modalStack.forEach((modal, index) => {
    // For first modal, z-index is baseZIndex
    // For second modal, z-index is baseZIndex + 20
    // This leaves room for the backdrop between them
    modal.element.style.zIndex = baseZIndex + index * 20;
  });

  const backdropModalStack = modalStack.filter((modal) => !modalSuppressesBackdrop(modal));

  if (backdropModalStack.length === 0) {
    backdrop.style.display = "none";
    return;
  }

  backdrop.style.display = "block";
  backdrop.style.backdropFilter = "blur(8px) saturate(112%)";
  backdrop.style.backgroundColor = "";

  if (backdropModalStack.length === modalStack.length && modalStack.length > 1) {
    const topModalIndex = modalStack.length - 1;
    backdrop.style.zIndex = baseZIndex + (topModalIndex - 1) * 20 + 10;
  } else {
    const topBackdropModal = backdropModalStack[backdropModalStack.length - 1];
    const topBackdropModalIndex = modalStack.indexOf(topBackdropModal);
    backdrop.style.zIndex = topBackdropModalIndex > 0
      ? baseZIndex + (topBackdropModalIndex - 1) * 20 + 10
      : baseZIndex - 1;
  }
}

// Function to create a new modal element
function createModalElement(path) {
  // Create modal element
  const newModal = document.createElement("div");
  newModal.className = "modal";
  newModal.path = path; // save name to the object
  newModal.dataset.modalPath = path;

  // Add click handlers to only close modal if both mousedown and mouseup are on the modal container
  let mouseDownTarget = null;
  newModal.addEventListener("mousedown", (event) => {
    mouseDownTarget = event.target;
  });
  newModal.addEventListener("mouseup", (event) => {
    if (
      event.target === newModal
      && mouseDownTarget === newModal
      && !modalRequiresExplicitClose(newModal)
    ) {
      closeModal();
    }
    mouseDownTarget = null;
  });


  // Create modal structure
  newModal.innerHTML = `
    <div class="modal-inner" x-data>
      <x-extension id="modal-shell-start"></x-extension>
      <div class="modal-header">
        <h2 class="modal-title"></h2>
        <button class="modal-close">&times;</button>
      </div>
      <div class="modal-scroll">
        <div class="modal-bd"></div>
      </div>
      <div class="modal-footer-slot" style="display: none;"></div>
      <x-extension id="modal-shell-end"></x-extension>
    </div>
  `;

  // Setup close button handler for this specific modal
  const close_button = newModal.querySelector(".modal-close");
  close_button.addEventListener("click", () => closeModal());


  // Add modal to DOM
  document.body.appendChild(newModal);

  // Show the modal
  newModal.classList.add("show");

  // Update modal z-indexes
  updateModalZIndexes();

  return {
    path: path,
    element: newModal,
    title: newModal.querySelector(".modal-title"),
    header: newModal.querySelector(".modal-header"),
    body: newModal.querySelector(".modal-bd"),
    close: close_button,
    footerSlot: newModal.querySelector(".modal-footer-slot"),
    inner: newModal.querySelector(".modal-inner"),
    styles: [],
    scripts: [],
    beforeClose: null,
    savedScrollSnapshot: null,
  };
}

// Function to open modal with content from URL
export async function openModal(modalPath, beforeClose = null) {
  const openCtx = { modalPath, modal: null, cancel: false };
  await callJsExtensions("open_modal_before", openCtx);
  if (openCtx.cancel) return;
  modalPath = openCtx.modalPath;

  return new Promise((resolve) => {
    try {
      const currentTopModal = modalStack[modalStack.length - 1];
      if (currentTopModal) {
        currentTopModal.savedScrollSnapshot = captureModalScrollSnapshot(currentTopModal);
      }

      // Create new modal instance
      const modal = createModalElement(modalPath);
      modal.beforeClose = beforeClose;
      openCtx.modal = modal;

      new MutationObserver(
        (_, o) =>
          !document.contains(modal.element) && (o.disconnect(), resolve())
      ).observe(document.body, { childList: true, subtree: true });

      // Set a loading state
      modal.body.innerHTML = '<div class="loading">Loading...</div>';

      // Already added to stack above

      // Use importComponent to load the modal content
      // This handles all HTML, styles, scripts and nested components
      // Updated path to use the new folder structure with modal.html
      const componentPath = modalPath; // `modals/${modalPath}/modal.html`;

      // Use importComponent which now returns the parsed document
      importComponent(componentPath, modal.body)
        .then(async (doc) => {
          // Set the title from the document
          modal.title.innerHTML = doc.title || modalPath;
          const htmlElement = doc.documentElement;
          if (htmlElement && htmlElement.classList) {
            const inner = modal.element.querySelector(".modal-inner");
            if (inner) inner.classList.add(...htmlElement.classList);
          }
          if (doc.body && doc.body.classList) {
            modal.body.classList.add(...doc.body.classList);
          }
          await callJsExtensions("modal_content_loaded", {
            modalPath,
            modal,
            doc,
          });
          dispatchModalEvent("modal-content-loaded", modal, { doc });
          refreshModalStack();
          
          // Some modals have a footer. Check if it exists and move it to footer slot
          // Use requestAnimationFrame to let Alpine mount the component first
          requestAnimationFrame(() => {
            const componentFooter = modal.body.querySelector('[data-modal-footer]');
            if (componentFooter && modal.footerSlot) {
              // Move footer outside modal-scroll scrollable area
              modal.footerSlot.appendChild(componentFooter);
              modal.footerSlot.style.display = 'block';
              modal.inner.classList.add('modal-with-footer');
            }
          });
        })
        .catch((error) => {
          console.error("Error loading modal content:", error);
          modal.body.innerHTML = `<div class="error">Failed to load modal content: ${error.message}</div>`;
        });

      // Add modal to stack and show it
      // Add modal to stack
      modal.path = modalPath;
      modalStack.push(modal);
      document.body.style.overflow = "hidden";

      activateModal(modal);
    } catch (error) {
      console.error("Error loading modal content:", error);
      resolve();
    }
  });
}

export function isModalOpen(modalPath) {
  return findModalIndexByPath(modalPath) !== -1;
}

export function getModalStack() {
  return modalStack.slice();
}

export function refreshModalStack() {
  if (modalStack.length === 0) {
    updateModalZIndexes();
    return;
  }
  activateModal(modalStack[modalStack.length - 1]);
}

export async function ensureModalOpen(modalPath, beforeClose = null) {
  if (focusModal(modalPath)) return null;
  return openModal(modalPath, beforeClose);
}

export async function toggleModal(modalPath, beforeClose = null) {
  if (!isModalOpen(modalPath)) {
    return openModal(modalPath, beforeClose);
  }
  while (isModalOpen(modalPath)) {
    const closed = await closeModal(modalPath);
    if (closed === false) return false;
  }
  return true;
}

// Function to close modal
export async function closeModal(modalPath = null) {
  if (modalStack.length === 0) return;

  let modalIndex = modalStack.length - 1; // Default to last modal
  let modal;

  if (modalPath) {
    // Find the modal with the specified name in the stack
    modalIndex = findModalIndexByPath(modalPath);
    if (modalIndex === -1) return; // Modal not found in stack

    // Get the modal from stack at the found index
    modal = modalStack[modalIndex];
  } else {
    // Just get the last modal (removal happens after beforeClose)
    modal = modalStack[modalStack.length - 1];
  }

  const closeCtx = { modalPath: modalPath ?? null, modal, cancel: false };
  await callJsExtensions("close_modal_before", closeCtx);
  if (closeCtx.cancel) return false;

  const canClose = async () => {
    if (!modal.beforeClose) return true;
    try {
      const result = await Promise.resolve(modal.beforeClose());
      return result !== false;
    } catch (error) {
      console.error("Error in beforeClose handler:", error);
      return true;
    }
  };

  return Promise.resolve(canClose()).then((shouldClose) => {
    if (!shouldClose) return false;

    if (modalPath) {
      // Remove the modal from stack after beforeClose check
      modalStack.splice(modalIndex, 1);
    } else {
      modalStack.pop();
    }

    // Remove modal-specific styles and scripts immediately
    modal.styles.forEach((styleId) => {
      document.querySelector(`[data-modal-style="${styleId}"]`)?.remove();
    });
    modal.scripts.forEach((scriptId) => {
      document.querySelector(`[data-modal-script="${scriptId}"]`)?.remove();
    });

    // First remove the show class to trigger the transition
    modal.element.classList.remove("show");

  // commented out to prevent race conditions

  // // Remove the modal element from DOM after animation
  // modal.element.addEventListener(
  //   "transitionend",
  //   () => {
  //     // Make sure the modal is completely removed from the DOM
  //     if (modal.element.parentNode) {
  //       modal.element.parentNode.removeChild(modal.element);
  //     }
  //   },
  //   { once: true }
  // );

  // // Fallback in case the transition event doesn't fire
  // setTimeout(() => {
  //   if (modal.element.parentNode) {
  //     modal.element.parentNode.removeChild(modal.element);
  //   }
  // }, 500); // 500ms should be enough for the transition to complete

    // remove immediately
    if (modal.element.parentNode) {
      modal.element.parentNode.removeChild(modal.element);
    }


    // Handle backdrop visibility and body overflow
    if (modalStack.length === 0) {
      // Hide backdrop when no modals are left
      backdrop.style.display = "none";
      document.body.style.overflow = "";
    } else {
      activateModal(modalStack[modalStack.length - 1]);
    }

    document.dispatchEvent(
      new CustomEvent("modal-closed", {
        detail: {
          modalPath: modal.path ?? null,
          remainingModalCount: modalStack.length,
        },
      }),
    );

    return true;
  });
}

// Function to scroll to element by ID within the last modal
export function scrollModal(id) {
  if (!id) return;

  // Get the last modal in the stack
  const lastModal = modalStack[modalStack.length - 1].element;
  if (!lastModal) return;

  // Find the modal container and target element
  const modalContainer = lastModal.querySelector(".modal-scroll");
  const targetElement = lastModal.querySelector(`#${id}`);

  if (modalContainer && targetElement) {
    modalContainer.scrollTo({
      top: targetElement.offsetTop - 20, // 20px padding from top
      behavior: "smooth",
    });
  }
}

// Make scrollModal globally available
globalThis.scrollModal = scrollModal;

// Handle modal content loading from clicks
document.addEventListener("click", async (e) => {
  const modalTrigger = e.target.closest("[data-modal-content]");
  if (modalTrigger) {
    e.preventDefault();
    if (
      modalTrigger.hasAttribute("disabled") ||
      modalTrigger.classList.contains("disabled")
    ) {
      return;
    }
    const modalPath = modalTrigger.getAttribute("href");
    await openModal(modalPath);
  }
});

// Close modal on escape key (closes only the top modal)
document.addEventListener("keydown", (e) => {
  if (e.key === "Escape" && modalStack.length > 0) {
    if (modalRequiresExplicitClose(modalStack[modalStack.length - 1])) return;
    closeModal();
  }
});

// also export as global function
globalThis.openModal = openModal;
globalThis.closeModal = closeModal;
globalThis.scrollModal = scrollModal;
globalThis.isModalOpen = isModalOpen;
globalThis.ensureModalOpen = ensureModalOpen;
globalThis.toggleModal = toggleModal;