"use client"

import { Badge } from "@/components/ui/badge"
import { Button } from "@/components/ui/button"
import { Separator } from "@/components/ui/separator"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import {
  Languages,
  Menu,
  X,
  LayoutDashboard,
  Users,
  Activity,
  Settings,
  ChevronLeft,
  Shield,
} from "lucide-react"
import Link from "next/link"
import { usePathname } from "next/navigation"
import { useState } from "react"
import { cn } from "@/lib/utils"

const navItems = [
  { label: "System Overview", href: "/admin", icon: LayoutDashboard },
  { label: "User Management", href: "/admin", icon: Users },
  { label: "Provider Status", href: "/admin", icon: Activity },
  { label: "Settings", href: "/admin/settings", icon: Settings },
]

export function AdminHeader() {
  const [mobileOpen, setMobileOpen] = useState(false)
  const pathname = usePathname()

  return (
    <>
      <header className="flex h-12 shrink-0 items-center justify-between border-b border-border bg-card px-3 lg:px-4">
        {/* Mobile menu */}
        <Button
          variant="ghost"
          size="icon-sm"
          className="lg:hidden"
          onClick={() => setMobileOpen(!mobileOpen)}
          aria-label="Toggle menu"
        >
          {mobileOpen ? <X className="size-3.5" /> : <Menu className="size-3.5" />}
        </Button>

        {/* Mobile brand */}
        <div className="flex items-center gap-1.5 lg:hidden">
          <div className="flex size-5 items-center justify-center rounded bg-foreground">
            <Languages className="size-2.5 text-background" />
          </div>
          <span className="text-xs font-semibold text-foreground">Admin</span>
        </div>

        {/* Desktop title */}
        <div className="hidden items-center gap-2 lg:flex">
          <h1 className="text-xs font-semibold text-foreground">System Administration</h1>
          <Separator orientation="vertical" className="h-3" />
          <span className="text-xs text-muted-foreground">Monitor infrastructure and manage users</span>
        </div>

        {/* Right side */}
        <div className="flex items-center gap-2">
          <Badge
            variant="outline"
            className="border-destructive/30 bg-destructive/5 text-destructive text-[10px] px-1.5 py-0"
          >
            <Shield className="mr-1 size-2.5" />
            Superadmin
          </Badge>
          <Avatar className="size-6">
            <AvatarFallback className="bg-foreground text-background text-[10px] font-semibold">
              SA
            </AvatarFallback>
          </Avatar>
        </div>
      </header>

      {/* Mobile nav */}
      {mobileOpen && (
        <div className="border-b border-border bg-card px-3 py-2 lg:hidden">
          <nav className="flex flex-col gap-0.5">
            {navItems.map((item) => {
              const isActive = pathname === item.href
              return (
                <Link
                  key={item.label}
                  href={item.href}
                  onClick={() => setMobileOpen(false)}
                  className={cn(
                    "flex items-center gap-2.5 rounded-md px-2.5 py-1.5 text-xs font-medium transition-colors",
                    isActive
                      ? "bg-secondary text-foreground"
                      : "text-muted-foreground hover:bg-secondary/60 hover:text-foreground"
                  )}
                >
                  <item.icon className="size-3.5 shrink-0" />
                  {item.label}
                </Link>
              )
            })}
            <Separator className="my-1" />
            <Link
              href="/dashboard"
              className="flex items-center gap-2.5 rounded-md px-2.5 py-1.5 text-xs font-medium text-muted-foreground hover:bg-secondary/60 hover:text-foreground"
            >
              <ChevronLeft className="size-3.5 shrink-0" />
              User Dashboard
            </Link>
          </nav>
        </div>
      )}
    </>
  )
}
