import type React from "react";
import { Link } from "@tanstack/react-router";
import { Building2, Cpu } from "lucide-react";
import {
  Sidebar,
  SidebarContent,
  SidebarFooter,
  SidebarGroup,
  SidebarGroupContent,
  SidebarGroupLabel,
  SidebarHeader,
  SidebarMenu,
  SidebarMenuButton,
  SidebarMenuItem,
} from "@/components/ui/sidebar";
import { cn } from "@/lib/utils";
import { appSidebarSection } from "@/types/app-sidebar";
import { PermissionEnum } from "@/types/permission";
import { useAuth } from "@/hooks/useAuth";
import { useMemo } from "react";

type SidebarItem = {
  title: string;
  url: string;
  code?: number;
  icon: React.ElementType;
  permissions?: PermissionEnum[];
};

type SidebarSection = {
  title: string;
  items: SidebarItem[];
};

export function AppSidebar() {
  const { hasPermission, acs } = useAuth();

  // Check if user is admin (has ALLOW_ALL permission)
  const isAdmin = acs.includes(PermissionEnum.ALLOW_ALL);

  // Check if user has any of the required permissions
  const checkPermissions = (permissions?: PermissionEnum[]) => {
    // No permissions defined = show to everyone
    if (!permissions || permissions.length === 0) return true;
    // Item marked as ALLOW_ALL = show to everyone
    if (permissions.includes(PermissionEnum.ALLOW_ALL)) return true;
    // Admin users see everything
    if (isAdmin) return true;
    // Check if user has any of the required permissions
    return permissions.some((permission) => hasPermission(permission));
  };

  // Filter sidebar sections and items based on permissions
  const filteredNavMain = useMemo(() => {
    return appSidebarSection.navMain
      .map((section) => ({
        ...section,
        items: section.items.filter((item) => checkPermissions(item.permissions)),
      }))
      .filter((section) => section.items.length > 0) as SidebarSection[];
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [acs]);

  return (
    <Sidebar
      collapsible="icon"
      className="border-r border-border/40 bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60"
    >
      <SidebarHeader className="border-b border-border/40 p-6">
        <div className="flex items-center gap-3">
          <div className="flex aspect-square size-10 items-center justify-center rounded-xl bg-gradient-to-br from-gray-900 to-black text-white shadow-lg ring-1 ring-gray-800/30">
            <Building2 className="size-5" />
          </div>
          <div className="flex flex-col gap-0.5 leading-none">
            <span className="font-bold text-base tracking-tight bg-gradient-to-r from-foreground to-foreground/80 bg-clip-text">
              TTMT Computer Management
            </span>
            <span className="text-xs text-muted-foreground font-medium flex items-center gap-1">
              <Cpu className="size-3" />
              v1.0.0
            </span>
          </div>
        </div>
      </SidebarHeader>

      <SidebarContent className="p-4">
        {filteredNavMain.map((section) => (
          <SidebarGroup key={section.title}>
            <SidebarGroupLabel className="text-xs font-semibold text-muted-foreground/80 uppercase tracking-wider mb-2">
              {section.title}
            </SidebarGroupLabel>
            <SidebarGroupContent>
              <SidebarMenu className="space-y-1">
                {section.items.map((item) => (
                  <SidebarMenuItem key={item.title}>
                    <SidebarMenuButton
                      asChild
                      tooltip={item.title}
                      className={cn(
                        "w-full justify-start gap-3 px-4 py-3 rounded-xl",
                        "hover:bg-accent/60 hover:text-accent-foreground hover:shadow-sm",
                        "transition-all duration-200 ease-in-out",
                        "group relative overflow-hidden",
                        "data-[active=true]:bg-primary data-[active=true]:text-primary-foreground",
                        "data-[active=true]:shadow-md data-[active=true]:ring-1 data-[active=true]:ring-primary/20"
                      )}
                    >
                      <Link
                        href={item.url}
                        to={item.url}
                        className="flex items-center gap-3 w-full"
                      >
                        <item.icon className="size-5 shrink-0 transition-all duration-200 group-hover:scale-110 group-hover:text-primary" />
                        <span className="font-medium text-sm truncate">
                          {item.title}
                        </span>
                      </Link>
                    </SidebarMenuButton>
                  </SidebarMenuItem>
                ))}
              </SidebarMenu>
            </SidebarGroupContent>
          </SidebarGroup>
        ))}
      </SidebarContent>

      <SidebarFooter className="border-t border-border/40 p-4 space-y-3">
        <div className="px-2 text-xs text-muted-foreground/60 font-medium">
          © 2025 NAVIS Centre
        </div>
      </SidebarFooter>
    </Sidebar>
  );
}