import { Link, Outlet, useNavigate } from '@tanstack/react-router'
import { Toaster } from '@/components/ui/toast'
import { useLogout, useMe } from '@/lib/auth'

const navLinks = [
  { to: '/gardens', label: 'Gardens' },
  { to: '/plants', label: 'Plants' },
] as const

// TanStack Router concatenates the base className with activeProps/inactiveProps,
// so state-specific and conflicting utilities (text-muted vs text-fg) live in the
// state props — never in the base — to avoid ambiguous overrides.
const navLinkBase = 'rounded-md px-3 py-1.5 text-sm font-medium transition-colors'
const navLinkActive = 'bg-border/60 text-fg'
const navLinkInactive = 'text-muted hover:bg-border/60 hover:text-fg'

/** Top-level chrome: a sticky nav bar plus the routed page in an <Outlet>. */
export function AppShell() {
  const me = useMe()
  const logout = useLogout()
  const navigate = useNavigate()
  const user = me.data

  async function onLogout() {
    try {
      await logout.mutateAsync()
      await navigate({ to: '/login' })
    } catch {
      // The logout request failed, so the session is still valid server-side:
      // leave the user where they are (the button re-enables for a retry) rather
      // than pretending they're signed out. logout.isError drives the title below.
    }
  }

  return (
    <div className="flex min-h-full flex-col">
      <header className="sticky top-0 z-10 border-b border-border bg-surface/90 backdrop-blur">
        <nav className="mx-auto flex max-w-5xl items-center gap-4 px-4 py-3">
          <Link to="/gardens" className="text-lg font-semibold text-accent-strong">
            🌱 pansy
          </Link>

          <div className="flex flex-1 items-center gap-1">
            {user &&
              navLinks.map((l) => (
                <Link
                  key={l.to}
                  to={l.to}
                  className={navLinkBase}
                  activeProps={{ className: navLinkActive }}
                  inactiveProps={{ className: navLinkInactive }}
                >
                  {l.label}
                </Link>
              ))}
          </div>

          {user ? (
            <div className="flex items-center gap-2">
              <span className="hidden text-sm text-muted sm:inline">{user.displayName}</span>
              <button
                type="button"
                onClick={onLogout}
                disabled={logout.isPending}
                title={logout.isError ? 'Sign out failed — try again' : undefined}
                className="rounded-md px-3 py-1.5 text-sm font-medium text-muted transition-colors hover:text-fg disabled:opacity-60"
              >
                {logout.isPending ? 'Signing out…' : logout.isError ? 'Retry sign out' : 'Sign out'}
              </button>
            </div>
          ) : (
            <Link
              to="/login"
              className="rounded-md px-3 py-1.5 text-sm font-medium text-muted transition-colors hover:text-fg"
            >
              Sign in
            </Link>
          )}
        </nav>
      </header>

      <main className="mx-auto w-full max-w-5xl flex-1 px-4 py-6">
        <Outlet />
      </main>

      <Toaster />
    </div>
  )
}