"use client";
import React, { useEffect, useRef, useState,useCallback } from "react";
import Link from "next/link";
import Image from "next/image";
import { useTranslations } from "next-intl";
import { usePathname } from "next/navigation";
import { useSidebar } from "../context/SidebarContext";
import useSWR from "swr";
import axios from "@/lib/axios";
import {
  LayoutGrid,
  Calendar,
  Users,
  ShieldCheck,
  LifeBuoy,
  FileText,
  Send,
  Mail,
  Server,
  Layers,
  UserCircle,
  Settings,
  KeyRound,
  ChevronDown,
  Ellipsis,
} from "lucide-react";

type NavItem = {
  name: string;
  icon: string;
  route?: string;
  subItems?: { name: string; route: string; pro?: boolean; new?: boolean }[];
};

type MenuGroup = {
  title: string;
  items: NavItem[];
};

const iconMap: Record<string, React.ReactNode> = {
  dashboard: <LayoutGrid size={20} />,
  calendar: <Calendar size={20} />,
  users: <Users size={20} />,
  certificate: <ShieldCheck size={20} />,
  "support-ticket": <LifeBuoy size={20} />,
  pages: <FileText size={20} />,
  email: <Send size={20} />,
  inbox: <Mail size={20} />,
  smtp: <Send size={20} />,
  "server-settings": <Server size={20} />,
  layers: <Layers size={20} />,
  "user-profile": <UserCircle size={20} />,
  settings: <Settings size={20} />,
  "api-key": <KeyRound size={20} />,
};

const getIcon = (iconName: string) => iconMap[iconName] || <LayoutGrid size={20} />;

// Static items removed in favor of dynamic API data

const AppSidebar: React.FC = () => {
  const { isExpanded, isMobileOpen, isHovered, setIsHovered } = useSidebar();
  const pathname = usePathname();
  const t = useTranslations("Navigation");

  const renderMenuItems = (
    navItems: NavItem[],
    menuType: string
  ) => (
    <ul className="flex flex-col gap-4">
      {navItems.map((nav, index) => (
        <li key={nav.name}>
          {nav.subItems ? (
            <button
              onClick={() => handleSubmenuToggle(index, menuType)}
              className={`menu-item group  ${
                openSubmenu?.type === menuType && openSubmenu?.index === index
                  ? "menu-item-active"
                  : "menu-item-inactive"
              } cursor-pointer ${
                !isExpanded && !isHovered
                  ? "lg:justify-center"
                  : "lg:justify-start"
              }`}
            >
              <span
                className={` ${
                  openSubmenu?.type === menuType && openSubmenu?.index === index
                    ? "menu-item-icon-active"
                    : "menu-item-icon-inactive"
                }`}
              >
                {getIcon(nav.icon)}
              </span>
              {(isExpanded || isHovered || isMobileOpen) && (
                <span className={`menu-item-text`}>
                  {(() => {
                    const key = nav.name.toLowerCase().replace(/\s+/g, '_');
                    const translated = t(key);
                    return translated === `Navigation.${key}` ? nav.name : translated;
                  })()}
                </span>
              )}
              {(isExpanded || isHovered || isMobileOpen) && (
                <ChevronDown
                  size={20}
                  className={`ml-auto w-5 h-5 transition-transform duration-200  ${
                    openSubmenu?.type === menuType &&
                    openSubmenu?.index === index
                      ? "rotate-180 text-brand-500"
                      : ""
                  }`}
                />
              )}
            </button>
          ) : (
            nav.route && (
              <Link
                href={nav.route}
                className={`menu-item group ${
                  isActive(nav.route) ? "menu-item-active" : "menu-item-inactive"
                }`}
              >
                <span
                  className={`${
                    isActive(nav.route)
                      ? "menu-item-icon-active"
                      : "menu-item-icon-inactive"
                  }`}
                >
                  {getIcon(nav.icon)}
                </span>
                {(isExpanded || isHovered || isMobileOpen) && (
                  <span className={`menu-item-text`}>
                    {(() => {
                      const key = nav.name.toLowerCase().replace(/\s+/g, '_');
                      const translated = t(key);
                      return translated === `Navigation.${key}` ? nav.name : translated;
                    })()}
                  </span>
                )}
              </Link>
            )
          )}
          {nav.subItems && (isExpanded || isHovered || isMobileOpen) && (
            <div
              ref={(el) => {
                subMenuRefs.current[`${menuType}-${index}`] = el;
              }}
              className="overflow-hidden transition-all duration-300"
              style={{
                height:
                  openSubmenu?.type === menuType && openSubmenu?.index === index
                    ? `${subMenuHeight[`${menuType}-${index}`]}px`
                    : "0px",
              }}
            >
              <ul className="mt-2 space-y-1 ml-9">
                {nav.subItems.map((subItem) => (
                  <li key={subItem.name}>
                    <Link
                      href={subItem.route}
                      className={`menu-dropdown-item ${
                        isActive(subItem.route)
                          ? "menu-dropdown-item-active"
                          : "menu-dropdown-item-inactive"
                      }`}
                    >
                      {(() => {
                        const key = subItem.name.toLowerCase().replace(/\s+/g, '_');
                        const translated = t(key);
                        return translated === `Navigation.${key}` ? subItem.name : translated;
                      })()}
                      <span className="flex items-center gap-1 ml-auto">
                        {subItem.new && (
                          <span
                            className={`ml-auto ${
                              isActive(subItem.route)
                                ? "menu-dropdown-badge-active"
                                : "menu-dropdown-badge-inactive"
                            } menu-dropdown-badge `}
                          >
                            new
                          </span>
                        )}
                        {subItem.pro && (
                          <span
                            className={`ml-auto ${
                              isActive(subItem.route)
                                ? "menu-dropdown-badge-active"
                                : "menu-dropdown-badge-inactive"
                            } menu-dropdown-badge `}
                          >
                            pro
                          </span>
                        )}
                      </span>
                    </Link>
                  </li>
                ))}
              </ul>
            </div>
          )}
        </li>
      ))}
    </ul>
  );

  const { data: menuGroups, error } = useSWR<MenuGroup[]>('/api/navigation', () =>
    axios.get('/api/navigation').then(res => res.data)
  );

  const [openSubmenu, setOpenSubmenu] = useState<{
    type: string;
    index: number;
  } | null>(null);
  const [subMenuHeight, setSubMenuHeight] = useState<Record<string, number>>(
    {}
  );
  const subMenuRefs = useRef<Record<string, HTMLDivElement | null>>({});

  // const isActive = (path: string) => path === pathname;
   const isActive = useCallback((path: string) => path === pathname, [pathname]);

  useEffect(() => {
    if (!menuGroups) return;
    
    // Check if the current path matches any submenu item
    let targetSubmenu: { type: string; index: number } | null = null;
    
    // Use some/find to break early if possible, or just foreach
    for (const group of menuGroups) {
      for (let index = 0; index < group.items.length; index++) {
        const nav = group.items[index];
        if (nav.subItems) {
           const hasActiveSubItem = nav.subItems.some(subItem => isActive(subItem.route));
           if (hasActiveSubItem) {
             targetSubmenu = { type: group.title, index };
             break; 
           }
        }
      }
      if (targetSubmenu) break;
    }

    // Only update state if it has changed to avoid loops and unnecessary re-renders
    const isMismatch = 
      (openSubmenu === null && targetSubmenu !== null) ||
      (openSubmenu !== null && targetSubmenu === null) ||
      (openSubmenu && targetSubmenu && (openSubmenu.type !== targetSubmenu.type || openSubmenu.index !== targetSubmenu.index));

    if (isMismatch) {
      setOpenSubmenu(targetSubmenu);
    }
  }, [pathname, isActive, menuGroups, openSubmenu]);

  useEffect(() => {
    // Set the height of the submenu items when the submenu is opened
    if (openSubmenu !== null) {
      const key = `${openSubmenu.type}-${openSubmenu.index}`;
      if (subMenuRefs.current[key]) {
        setSubMenuHeight((prevHeights) => ({
          ...prevHeights,
          [key]: subMenuRefs.current[key]?.scrollHeight || 0,
        }));
      }
    }
  }, [openSubmenu]);

  const handleSubmenuToggle = (index: number, menuType: string) => {
    setOpenSubmenu((prevOpenSubmenu) => {
      if (
        prevOpenSubmenu &&
        prevOpenSubmenu.type === menuType &&
        prevOpenSubmenu.index === index
      ) {
        return null;
      }
      return { type: menuType, index };
    });
  };

  return (
    <aside
      className={`fixed mt-16 flex flex-col lg:mt-0 top-0 px-5 left-0 bg-white dark:bg-gray-900 dark:border-gray-800 text-gray-900 h-[calc(100vh-4rem)] lg:h-screen transition-all duration-300 ease-in-out z-50 border-r border-gray-200 
        ${
          isExpanded || isMobileOpen
            ? "w-[290px]"
            : isHovered
            ? "w-[290px]"
            : "w-[90px]"
        }
        ${isMobileOpen ? "translate-x-0" : "-translate-x-full"}
        lg:translate-x-0`}
      onMouseEnter={() => !isExpanded && setIsHovered(true)}
      onMouseLeave={() => setIsHovered(false)}
    >
      <div
        className={`py-8 flex  ${
          !isExpanded && !isHovered ? "lg:justify-center" : "justify-start"
        }`}
      >
        <Link href="/">
          {isExpanded || isHovered || isMobileOpen ? (
            <>
              <Image
                className="dark:hidden"
                src="/images/logo/logo.svg"
                alt="Logo"
                width={150}
                height={40}
                style={{ width: "auto", height: "auto" }}
                priority
              />
              <Image
                className="hidden dark:block"
                src="/images/logo/logo-dark.svg"
                alt="Logo"
                width={150}
                height={40}
                style={{ width: "auto", height: "auto" }}
                priority
              />
            </>
          ) : (
            <Image
              src="/images/logo/logo-icon.svg"
              alt="Logo"
              width={32}
              height={32}
              style={{ width: "auto", height: "auto" }}
            />
          )}
        </Link>
      </div>
      <div className="flex flex-col flex-1 overflow-y-auto duration-300 ease-linear no-scrollbar pb-24">
        <nav className="mb-6">
          <div className="flex flex-col gap-4">
            {menuGroups?.map((group, groupIndex) => (
              <div key={group.title}>
                <h2
                  className={`mb-4 text-xs uppercase flex leading-[20px] text-gray-400 ${
                    !isExpanded && !isHovered
                      ? "lg:justify-center"
                      : "justify-start"
                  }`}
                >
                  {isExpanded || isHovered || isMobileOpen ? (
                    (() => {
                      const key = group.title.toLowerCase().replace(/\s+/g, '_');
                      try { return t(key); } catch { return group.title; }
                    })()
                  ) : (
                    <Ellipsis size={16} />
                  )}
                </h2>
                {renderMenuItems(group.items, group.title)}
              </div>
            ))}
            
            {error && (
               <div className="px-4 py-2 text-xs text-red-500 bg-red-50 rounded-lg">
                  Failed to load navigation
               </div>
            )}
          </div>
        </nav>
      </div>
    </aside>
  );
};

export default AppSidebar;