import { AppShell } from "@/components/app-shell";
import { Avatar } from "@/components/avatar";
import { StatusBadge } from "@/components/status-badge";
import { SYSTEM_PERMISSIONS } from "@/lib/access";
import { prisma } from "@/lib/prisma";
import { requireCurrentUser, userIsAdmin } from "@/lib/session";
import { requireInitialSetup } from "@/lib/setup";
import Link from "next/link";
import { redirect } from "next/navigation";

export default async function AdminPage() {
  await requireInitialSetup();
  const user = await requireCurrentUser();

  if (!userIsAdmin(user)) {
    redirect("/dashboard");
  }

  const [personalRoom, users, rooms, roles] = await Promise.all([
    prisma.room.findFirst({ where: { ownerId: user.id }, select: { slug: true } }),
    prisma.user.findMany({
      include: { roles: { include: { role: true } }, _count: { select: { ownedRooms: true, roomMembers: true } } },
      orderBy: { createdAt: "asc" }
    }),
    prisma.room.findMany({
      include: { owner: true, _count: { select: { members: true, mediaSources: true } } },
      orderBy: { updatedAt: "desc" }
    }),
    prisma.role.findMany({
      include: { _count: { select: { users: true, permissions: true } } },
      orderBy: { name: "asc" }
    })
  ]);

  return (
    <AppShell
      active="Admin"
      isAdmin
      roomHref={personalRoom ? `/rooms/${encodeURIComponent(personalRoom.slug)}` : "/dashboard"}
      userName={user.displayName || user.username}
    >
      <header className="topbar">
        <div className="title-block">
          <h1>Admin</h1>
          <p>Manage roles, rooms, permissions, and users.</p>
        </div>
        <StatusBadge tone="good">Admin</StatusBadge>
      </header>
      <section className="room-layout">
        <section className="panel">
          <div className="panel-header">
            <h2>Rooms</h2>
            <StatusBadge>{rooms.length} total</StatusBadge>
          </div>
          <div className="panel-body">
            <table className="table">
              <thead>
                <tr>
                  <th>Name</th>
                  <th>Owner</th>
                  <th>Access</th>
                  <th>Status</th>
                </tr>
              </thead>
              <tbody>
                {rooms.map((room) => (
                  <tr key={room.id}>
                    <td>
                      <Link href={`/rooms/${encodeURIComponent(room.slug)}`}>{room.name}</Link>
                    </td>
                    <td>{room.owner?.displayName || room.owner?.username || "Unassigned"}</td>
                    <td>{room.visibility}</td>
                    <td>{room._count.members + 1} users / {room._count.mediaSources} media</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        </section>
        <section className="panel">
          <div className="panel-header">
            <h2>Users</h2>
            <StatusBadge>{users.length} accounts</StatusBadge>
          </div>
          <div className="panel-body">
            {users.map((account) => (
              <div className="row" key={account.id}>
                <div className="row-main">
                  <Avatar name={account.displayName || account.username} />
                  <div className="row-title">
                    <strong>{account.displayName || account.username}</strong>
                    <span>@{account.username} · {account._count.ownedRooms + account._count.roomMembers} rooms</span>
                  </div>
                </div>
                <div className="status-row">
                  {account.roles.map((userRole) => (
                    <StatusBadge key={userRole.roleId} tone={userRole.role.name === "admin" ? "good" : undefined}>
                      {userRole.role.name}
                    </StatusBadge>
                  ))}
                  {account.roles.length === 0 ? <StatusBadge>user</StatusBadge> : null}
                </div>
              </div>
            ))}
          </div>
        </section>
      </section>
      <section className="room-layout" style={{ marginTop: 18 }}>
        <section className="panel">
          <div className="panel-header">
            <h2>Roles</h2>
            <StatusBadge>{roles.length} defined</StatusBadge>
          </div>
          <div className="panel-body">
            {roles.map((role) => (
              <div className="row" key={role.id}>
                <div className="row-title">
                  <strong>{role.name}</strong>
                  <span>{role.description || `${role.scope.toLowerCase()} role`}</span>
                </div>
                <StatusBadge>{role._count.users} users / {role._count.permissions} permissions</StatusBadge>
              </div>
            ))}
          </div>
        </section>
        <section className="panel">
          <div className="panel-header">
            <h2>Permissions</h2>
            <StatusBadge>System</StatusBadge>
          </div>
          <div className="panel-body">
            {SYSTEM_PERMISSIONS.map((permission) => (
              <div className="row" key={permission}>
                <div className="row-title">
                  <strong>{permission}</strong>
                  <span>Assignable to roles</span>
                </div>
                <StatusBadge>Enabled</StatusBadge>
              </div>
            ))}
          </div>
        </section>
      </section>
    </AppShell>
  );
}