"use client"

import Link from "next/link"
import { useSession } from "./SessionProvider"
import { authClient } from "@/lib/auth-client"
import { useEffect, useState } from "react"
import { useRoleSwitcher } from "./RoleSwitcher"

export default function Navigation() {
  const { session, loading } = useSession()
  const [userRole, setUserRole] = useState<string | null>(null)
  const { viewAsRole, setViewAsRole, effectiveRole } = useRoleSwitcher()

  useEffect(() => {
    const fetchUserRole = async () => {
      const userId = (session?.user as { id?: string })?.id
      if (userId) {
        try {
          const response = await fetch(`/api/users/${userId}/role`)
          if (response.ok) {
            const data = await response.json()
            setUserRole(data.role)
          } else {
            setUserRole(null)
          }
        } catch {
          setUserRole(null)
        }
      } else {
        setUserRole(null)
      }
    }

    fetchUserRole()
  }, [session])

  const handleLogout = async () => {
    setViewAsRole(null)
    await authClient.signOut()
    window.location.href = '/auth/login'
  }

  const displayRole = effectiveRole || userRole
  const isSiteAdmin = userRole === "site_admin"

  const wordmarkHref = session
    ? (displayRole === "club_admin" || displayRole === "site_admin")
      ? "/admin"
      : "/rankings"
    : "/"

  const roleLabels: Record<string, string> = {
    player: "Player",
    tournament_admin: "Tournament Admin",
    club_admin: "Club Admin",
    site_admin: "Site Admin",
  }

  return (
    <>
      {viewAsRole && (
        <div className="bg-yellow-50 border-b border-yellow-200 px-4 py-2">
          <div className="max-w-7xl mx-auto flex items-center justify-between">
            <p className="text-sm text-yellow-800">
              <span className="font-medium">Viewing as {roleLabels[viewAsRole]}</span>
              {" "}&mdash; you are seeing what a {roleLabels[viewAsRole]?.toLowerCase()} would see.
            </p>
            <button
              onClick={() => setViewAsRole(null)}
              className="text-sm font-medium text-yellow-800 hover:text-yellow-900 underline"
              data-testid="reset-view-as"
            >
              Reset to Site Admin
            </button>
          </div>
        </div>
      )}
      <nav className="bg-white shadow-sm">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div className="flex justify-between h-16">
            <div className="flex items-center min-w-0 overflow-hidden">
              <Link
                href="/"
                className="text-xl font-bold text-gray-900 no-underline flex-shrink-0"
              >
                EuchreCamp
              </Link>
              <div className="hidden md:ml-6 md:flex md:space-x-8 min-w-0 overflow-hidden">
                <Link
                  href="/rankings"
                  className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                >
                  Rankings
                </Link>
                {session && (
                  <>
                    <Link
                      href="/admin/tournaments"
                      className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                    >
                      Tournaments
                    </Link>
                    {(displayRole === "club_admin" || displayRole === "site_admin") && (
                      <>
                        <Link
                          href="/admin"
                          className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                        >
                          Admin
                        </Link>
                        <Link
                          href="/admin/matches"
                          className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                        >
                          Matches
                        </Link>
                        <Link
                          href="/admin/players"
                          className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                        >
                          Players
                        </Link>
                        <Link
                          href="/admin/users"
                          className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                        >
                          Users
                        </Link>
                        <Link
                          href="/admin/matches/upload"
                          className="border-transparent text-gray-500 hover:text-gray-700 inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium"
                        >
                          Upload Matches
                        </Link>
                      </>
                    )}
                  </>
                )}
              </div>
            </div>
            <div className="flex items-center min-w-0 overflow-hidden space-x-4">
              {isSiteAdmin && (
                <select
                  value={viewAsRole || ""}
                  onChange={(e) => setViewAsRole(e.target.value ? e.target.value as "player" | "tournament_admin" | "club_admin" : null)}
                  className="text-sm border border-gray-300 rounded-md px-2 py-1 bg-white text-gray-700 focus:outline-none focus:ring-green-500 focus:border-green-500"
                  data-testid="role-switcher"
                >
                  <option value="">Viewing as Site Admin</option>
                  <option value="player">View as Player</option>
                  <option value="tournament_admin">View as Tournament Admin</option>
                  <option value="club_admin">View as Club Admin</option>
                </select>
              )}
              {loading ? (
                <div className="text-gray-500">Loading...</div>
              ) : session ? (
                <div className="flex items-center space-x-4">
                  <span className="text-gray-700 text-sm font-medium">
                    {(session.user as { name?: string; email?: string })?.name ||
                     (session.user as { name?: string; email?: string })?.email}
                  </span>
                  <button
                    onClick={handleLogout}
                    className="text-gray-500 hover:text-gray-700 text-sm font-medium"
                  >
                    Sign out
                  </button>
                </div>
              ) : (
                <div className="flex items-center space-x-4">
                  <Link
                    href="/auth/login"
                    className="text-gray-500 hover:text-gray-700 text-sm font-medium"
                  >
                    Sign in
                  </Link>
                  <Link
                    href="/auth/register"
                    className="bg-green-600 text-white px-3 py-1 rounded-md text-sm font-medium hover:bg-green-700"
                  >
                    Sign up
                  </Link>
                </div>
              )}
            </div>
          </div>
        </div>
      </nav>
    </>
  )
}