'use client';

/* MoreDrawer — phase 02 (DRAWER-01..05).
 *
 * shadcn Sheet (side="right") with three top-to-bottom sections:
 *   1. Mobile sections — Engagement (in-shell route, no ExternalLink hint)
 *   2. Full site       — desktop-only routes, each with ExternalLink hint
 *   3. Account         — current user (read-only) + Sign out
 *
 * Open state is controlled by the parent so the header avatar AND the
 * bottom-nav More cell can both trigger this single drawer. */

import Link from 'next/link';
import { useRouter } from 'next/navigation';
import {
  ExternalLink,
  FileText,
  Server,
  HardDrive,
  BarChart3,
  Settings,
  Users,
  LogOut,
} from 'lucide-react';
import {
  Sheet,
  SheetContent,
  SheetHeader,
  SheetTitle,
  SheetDescription,
  SheetClose,
} from '@/components/ui/sheet';
import { useSession, signOut } from '@/lib/auth-client';
import { toast } from 'sonner';

const MOBILE_SECTIONS = [
  { href: '/mobile/engagement', label: 'Engagement', icon: Users },
];

const DESKTOP_LINKS = [
  { href: '/quotes',               label: 'Quotes',              icon: FileText },
  { href: '/configuration-items',  label: 'Configuration Items', icon: Server },
  { href: '/backup-status',        label: 'Backup Status',       icon: HardDrive },
  { href: '/admin/ticket-digest',  label: 'Ticket Digest',       icon: BarChart3 },
  { href: '/admin/sync',           label: 'Admin / Sync',        icon: Settings },
];

interface MoreDrawerProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
}

export function MoreDrawer({ open, onOpenChange }: MoreDrawerProps) {
  const router = useRouter();
  const { data: session } = useSession();
  const user = session?.user as
    | { name?: string; email?: string; image?: string | null }
    | undefined;

  const initials = (user?.name ?? user?.email ?? '?')
    .split(/[\s@]/)
    .filter(Boolean)
    .slice(0, 2)
    .map((p) => p[0]?.toUpperCase())
    .join('');

  async function handleSignOut() {
    try {
      await signOut();
      router.push('/auth/sign-in');
    } catch (e) {
      toast.error('Sign out failed');
      console.error('Sign out failed:', e);
    }
  }

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent side="right" className="w-80 sm:max-w-sm flex flex-col">
        <SheetHeader>
          <SheetTitle>Menu</SheetTitle>
          <SheetDescription className="sr-only">
            Navigation, full-site links, and account actions.
          </SheetDescription>
        </SheetHeader>

        {/* Section 1: Mobile sections (DRAWER-03) */}
        <div className="px-4">
          <p className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-2">
            Mobile sections
          </p>
          <div className="rounded-2xl border divide-y overflow-hidden">
            {MOBILE_SECTIONS.map(({ href, label, icon: Icon }) => (
              <SheetClose asChild key={href}>
                <Link
                  href={href}
                  className="flex items-center gap-3 px-4 py-3 hover:bg-accent transition-colors"
                >
                  <Icon className="w-4 h-4 text-muted-foreground shrink-0" />
                  <span className="text-sm flex-1">{label}</span>
                </Link>
              </SheetClose>
            ))}
          </div>
        </div>

        {/* Section 2: Full site (DRAWER-04) */}
        <div className="px-4">
          <p className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-2">
            Full site
          </p>
          <div className="rounded-2xl border divide-y overflow-hidden">
            {DESKTOP_LINKS.map(({ href, label, icon: Icon }) => (
              <SheetClose asChild key={href}>
                <Link
                  href={href}
                  className="flex items-center gap-3 px-4 py-3 hover:bg-accent transition-colors"
                >
                  <Icon className="w-4 h-4 text-muted-foreground shrink-0" />
                  <span className="text-sm flex-1">{label}</span>
                  <ExternalLink className="w-3.5 h-3.5 text-muted-foreground shrink-0" />
                </Link>
              </SheetClose>
            ))}
          </div>
        </div>

        {/* Section 3: Account (DRAWER-05, PROF-04) */}
        <div className="px-4 mt-auto pb-safe">
          <p className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-2">
            Account
          </p>
          <div className="rounded-2xl border overflow-hidden">
            {user && (
              <SheetClose asChild>
                <Link href="/mobile/profile" className="flex items-center gap-3 px-4 py-3 hover:bg-accent transition-colors border-b">
                  <span className="inline-flex h-8 w-8 items-center justify-center rounded-full bg-primary/15 text-primary text-xs font-semibold shrink-0">
                    {initials}
                  </span>
                  <div className="flex-1 min-w-0">
                    {user.name && (
                      <p className="text-sm font-medium leading-tight truncate">
                        {user.name}
                      </p>
                    )}
                    {user.email && (
                      <p className="text-xs text-muted-foreground truncate" title={user.email}>
                        {user.email}
                      </p>
                    )}
                  </div>
                </Link>
              </SheetClose>
            )}
            <SheetClose asChild>
              <Link href="/mobile/profile" className="flex items-center gap-3 px-4 py-3 hover:bg-accent transition-colors border-b">
                <Settings className="w-4 h-4 text-muted-foreground shrink-0" />
                <span className="text-sm flex-1">Profile &amp; preferences</span>
              </Link>
            </SheetClose>
            <button
              type="button"
              onClick={handleSignOut}
              className="w-full flex items-center gap-3 px-4 py-3 text-destructive hover:bg-destructive/10 transition-colors"
            >
              <LogOut className="w-4 h-4 shrink-0" />
              <span className="text-sm">Sign out</span>
            </button>
          </div>
        </div>
      </SheetContent>
    </Sheet>
  );
}