import type { Metadata } from "next";
import { db, count } from "@epicure/db";
import { users } from "@epicure/db";
import { desc } from "@epicure/db";
import { Badge } from "@/components/ui/badge";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import { CreateUserDialog } from "@/components/admin/create-user-dialog";
import Link from "next/link";
import { requireFullAdminPage } from "@/lib/require-admin-page";

export const metadata: Metadata = {};

const PAGE_SIZE = 100;

interface PageProps {
  searchParams: Promise<{ page?: string }>;
}

const ROLE_COLORS = {
  user: "secondary",
  moderator: "outline",
  admin: "destructive",
} as const;

const TIER_COLORS = {
  free: "secondary",
  pro: "default",
  family: "default",
} as const;

export default async function AdminUsersPage({ searchParams }: PageProps) {
  await requireFullAdminPage();
  const { page: pageParam } = await searchParams;
  const page = Math.max(1, parseInt(pageParam ?? "1", 10) || 1);
  const offset = (page - 1) * PAGE_SIZE;

  const [allUsers, totalRow] = await Promise.all([
    db
      .select()
      .from(users)
      .orderBy(desc(users.createdAt))
      .limit(PAGE_SIZE)
      .offset(offset),
    db.select({ count: count() }).from(users),
  ]);
  const total = totalRow[0]?.count ?? 0;

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <h1 className="text-2xl font-bold tracking-tight">Users</h1>
        <CreateUserDialog />
      </div>
      <div className="rounded-md border overflow-x-auto">
        <table className="w-full text-sm">
          <thead className="border-b bg-muted/50">
            <tr>
              <th className="px-4 py-3 text-left font-medium">User</th>
              <th className="px-4 py-3 text-left font-medium">Role</th>
              <th className="px-4 py-3 text-left font-medium">Tier</th>
              <th className="px-4 py-3 text-left font-medium">Joined</th>
            </tr>
          </thead>
          <tbody>
            {allUsers.map((user) => (
              <tr key={user.id} className="border-b last:border-0 hover:bg-muted/30">
                <td className="px-4 py-3">
                  <Link href={`/admin/users/${user.id}`} className="flex items-center gap-3 group">
                    <Avatar className="h-8 w-8">
                      <AvatarImage src={user.avatarUrl ?? ""} alt={user.name} />
                      <AvatarFallback className="text-xs">
                        {user.name.slice(0, 2).toUpperCase()}
                      </AvatarFallback>
                    </Avatar>
                    <div>
                      <div className="font-medium group-hover:underline underline-offset-4">{user.name}</div>
                      <div className="text-muted-foreground text-xs">{user.email}</div>
                    </div>
                  </Link>
                </td>
                <td className="px-4 py-3">
                  <Badge variant={ROLE_COLORS[user.role]}>{user.role}</Badge>
                </td>
                <td className="px-4 py-3">
                  <Badge variant={TIER_COLORS[user.tier]}>{user.tier}</Badge>
                </td>
                <td className="px-4 py-3 text-muted-foreground">
                  {user.createdAt.toLocaleDateString()}
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>

      <div className="flex gap-2">
        {page > 1 && (
          <Link
            href={`/admin/users?page=${page - 1}`}
            className="rounded-md border px-3 py-1 text-sm hover:bg-accent"
          >
            Previous
          </Link>
        )}
        {offset + allUsers.length < total && (
          <Link
            href={`/admin/users?page=${page + 1}`}
            className="rounded-md border px-3 py-1 text-sm hover:bg-accent"
          >
            Next
          </Link>
        )}
      </div>
    </div>
  );
}
