"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { cn } from "@/lib/utils";
import {
  LayoutDashboard,
  FileText,
  FileCheck,
  PenTool,
  Search,
  Settings,
  Shield,
  Menu,
  Layers,
  BookOpen,
} from "lucide-react";
import { Button } from "@/components/ui/button";
import { useState } from "react";
import { Can } from "@/components/common/can";

interface SidebarProps {
  className?: string;
}

export function Sidebar({ className }: SidebarProps) {
  const pathname = usePathname();
  const [collapsed, setCollapsed] = useState(false);

  const navItems = [
    {
      title: "Dashboard",
      href: "/dashboard",
      icon: LayoutDashboard,
      permission: null, // Everyone can see
    },
    {
      title: "Correspondences",
      href: "/correspondences",
      icon: FileText,
      permission: null,
    },
    {
      title: "RFAs",
      href: "/rfas",
      icon: FileCheck,
      permission: null,
    },
    {
      title: "Drawings",
      href: "/drawings",
      icon: PenTool,
      permission: null,
    },
    {
      title: "Circulations",
      href: "/circulation",
      icon: Layers, // Start with generic icon, maybe update import if needed
      permission: null,
    },
    {
      title: "Transmittals",
      href: "/transmittals",
      icon: FileText,
      permission: null,
    },
    {
      title: "Search",
      href: "/search",
      icon: Search,
      permission: null,
    },
    {
      title: "Admin Panel",
      href: "/admin",
      icon: Shield,
      permission: null,
    },
    {
      title: "Security",
      href: "/admin/security/roles",
      icon: Shield,
      permission: "system.manage_security",
    },
    {
      title: "System Logs",
      href: "/admin/system-logs/numbering",
      icon: Layers,
      permission: "system.view_logs",
    },
    {
      title: "Reference Data",
      href: "/admin/reference",
      icon: BookOpen,
      permission: "master_data.view",
    },
  ];

  return (
    <div
      className={cn(
        "flex flex-col h-screen border-r bg-card transition-all duration-300",
        collapsed ? "w-16" : "w-64",
        className
      )}
    >
      <div className="h-16 flex items-center justify-between px-4 border-b">
        {!collapsed && (
          <span className="text-lg font-bold text-primary truncate">
            LCBP3 DMS
          </span>
        )}
        <Button
          variant="ghost"
          size="icon"
          onClick={() => setCollapsed(!collapsed)}
          className={cn("ml-auto", collapsed && "mx-auto")}
        >
          <Menu className="h-5 w-5" />
        </Button>
      </div>

      <div className="flex-1 overflow-y-auto py-4">
        <nav className="grid gap-1 px-2">
          {navItems.map((item, index) => {
            const isActive = pathname.startsWith(item.href);

            const LinkComponent = (
              <Link
                key={index}
                href={item.href}
                className={cn(
                  "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors hover:bg-accent hover:text-accent-foreground",
                  isActive ? "bg-accent text-accent-foreground" : "text-muted-foreground",
                  collapsed && "justify-center px-2"
                )}
                title={collapsed ? item.title : undefined}
              >
                <item.icon className="h-5 w-5" />
                {!collapsed && <span>{item.title}</span>}
              </Link>
            );

            if (item.permission) {
              return (
                <Can key={index} permission={item.permission}>
                  {LinkComponent}
                </Can>
              );
            }

            return LinkComponent;
          })}
        </nav>
      </div>

      <div className="p-4 border-t">
        <Link
          href="/settings"
          className={cn(
            "flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium text-muted-foreground transition-colors hover:bg-accent hover:text-accent-foreground",
            collapsed && "justify-center px-2"
          )}
          title="Settings"
        >
          <Settings className="h-5 w-5" />
          {!collapsed && <span>Settings</span>}
        </Link>
      </div>
    </div>
  );
}