import { useEffect, useState } from "preact/hooks";
import { createPortal } from "preact/compat";
import { NavigationItem, NavigationMenuProps } from "./welcome-types.ts";
import { getNavigationGroups } from "./navigationConfig.ts";

/**
 * NavigationMenu Component
 * Dropdown menu with grouped navigation links
 * Positioned absolutely relative to the hamburger button
 * Closes when clicking outside
 *
 * @param showMenu - Whether menu is visible
 * @param menuButtonRef - Reference to the hamburger button for positioning
 * @param onClose - Handler to close the menu
 * @param isLoggedIn - User authentication status
 * @param currentRoute - Current route path
 * @param navigationGroups - Optional custom navigation groups
 */
export default function NavigationMenu(
  {
    showMenu,
    menuButtonRef,
    onClose,
    isLoggedIn,
    currentRoute,
    navigationGroups,
  }: NavigationMenuProps,
) {
  // Close menu when clicking outside - simplified to prevent issues
  useEffect(() => {
    if (!showMenu) return;

    const handleClickOutside = (event: MouseEvent) => {
      const target = event.target as HTMLElement;
      if (!target) return;

      // Simple check: if click is outside menu container and button
      if (
        !target.closest(".navigation-menu") &&
        !target.closest(".menu-button")
      ) {
        onClose();
      }
    };

    // Handle escape key
    const handleEscape = (event: KeyboardEvent) => {
      if (event.key === "Escape") {
        onClose();
      }
    };

    // Add listeners immediately without delay
    document.addEventListener("click", handleClickOutside, true);
    document.addEventListener("keydown", handleEscape);

    return () => {
      document.removeEventListener("click", handleClickOutside, true);
      document.removeEventListener("keydown", handleEscape);
    };
  }, [showMenu, onClose]);

  /**
   * Render a single navigation item
   */
  function renderNavigationItem(item: NavigationItem) {
    const baseClasses =
      "block w-full text-left px-4 py-2 transition-all duration-200";
    const stateClasses = (() => {
      if (item.disabled) {
        return "text-gray-500 cursor-not-allowed";
      }
      if (item.path === "/auth/logout") {
        return "text-red-400 hover:bg-red-400/10 hover:text-red-300 hover:shadow-[0_0_15px_rgba(248,113,113,0.3)]";
      }
      if (item.path === "/auth/login") {
        return "text-purple-400 hover:bg-purple-400/10 hover:text-purple-300 hover:shadow-[0_0_15px_rgba(192,132,252,0.3)]";
      }
      return "text-teal-400 hover:bg-teal-400/10 hover:text-teal-300 hover:shadow-[0_0_15px_rgba(20,184,166,0.3)]";
    })();

    // Skip current route items (except auth forms)
    if (!item.isForm && item.path === currentRoute) {
      return null;
    }

    // Handle form items (login/logout)
    if (item.isForm && item.formAction) {
      return (
        <form method={item.formMethod || "post"} action={item.formAction}>
          <button
            type="submit"
            onClick={item.onClick}
            class={`${baseClasses} ${stateClasses}`}
            role="menuitem"
            disabled={item.disabled}
          >
            {item.label}
          </button>
        </form>
      );
    }

    // Handle regular links
    return (
      <a
        href={item.path}
        class={`${baseClasses} ${stateClasses}`}
        onClick={(e) => {
          if (item.disabled) {
            e.preventDefault();
            return;
          }
          onClose();
        }}
        role="menuitem"
        aria-disabled={item.disabled}
      >
        {item.label}
      </a>
    );
  }

  /**
   * Render a navigation group with separator
   */
  function renderNavigationGroup(
    group: { id: string; label: string; items: NavigationItem[] },
  ) {
    if (group.items.length === 0) return null;

    return (
      <div key={group.id}>
        {group.id !== "auth" && (
          <div class="border-t border-teal-400/20 my-1"></div>
        )}
        {group.items.map(renderNavigationItem)}
      </div>
    );
  }

  // Track if we're in browser for portal rendering
  const [isBrowser, setIsBrowser] = useState(false);
  const [menuPosition, setMenuPosition] = useState({ top: 0, right: 0 });

  useEffect(() => {
    setIsBrowser(true);
  }, []);

  // Calculate menu position based on button location
  useEffect(() => {
    if (showMenu && menuButtonRef && isBrowser) {
      const rect = menuButtonRef.getBoundingClientRect();
      setMenuPosition({
        top: rect.bottom + 8, // 8px below the button
        right: window.innerWidth - rect.right, // Align right edge with button
      });
    }
  }, [showMenu, menuButtonRef, isBrowser]);

  if (!showMenu || !menuButtonRef) {
    return null;
  }

  // Position menu as fixed overlay using calculated coordinates
  const menuStyle = {
    position: "fixed" as const,
    top: `${menuPosition.top}px`,
    right: `${menuPosition.right}px`,
    zIndex: 9999,
    minWidth: "192px",
    boxShadow:
      "0 10px 15px -3px rgba(20, 184, 166, 0.3), 0 4px 6px -2px rgba(20, 184, 166, 0.2)",
    borderRadius: "0.5rem",
    border: "1px solid rgb(20, 184, 166)",
    backgroundColor: "black",
  };

  // Backdrop element to be portaled to body
  const backdrop = (
    <div
      style={{
        position: "fixed",
        top: 0,
        left: 0,
        right: 0,
        bottom: 0,
        backgroundColor: "rgba(0, 0, 0, 0.5)",
        backdropFilter: "blur(4px)",
        WebkitBackdropFilter: "blur(4px)",
        zIndex: 9998,
      }}
      onClick={onClose}
      aria-hidden="true"
    />
  );

  // Menu dropdown element to be portaled to body
  const menu = (
    <div
      class="w-48 bg-black rounded-lg shadow-xl border border-teal-400 py-2 navigation-menu transform transition-all duration-150 ease-out origin-top-right"
      style={menuStyle}
      role="menu"
      aria-label="Navigation menu"
      onClick={(e) => e.stopPropagation()}
    >
      {getNavigationGroups(isLoggedIn, currentRoute, navigationGroups).map(
        renderNavigationGroup,
      )}
    </div>
  );

  if (!isBrowser) {
    return null;
  }

  return createPortal(
    <>
      {/* Overlay backdrop */}
      {backdrop}
      {/* Menu dropdown */}
      {menu}
    </>,
    document.body,
  );
}