import Link from "next/link";
import { redirect } from "next/navigation";

import { getSession } from "@/lib/auth";
import { prisma } from "@/lib/prisma";
import { ShellPage } from "@/components/page-templates";
import { TablePlaceholder } from "@/components/placeholders";
import type { ReactNode } from "react";

type SearchRow = [string, string, string, ReactNode];

function toLocale(date: Date | null) {
  if (!date) {
    return "-";
  }

  const now = new Date();
  const diff = now.getTime() - date.getTime();
  if (diff < 60_000) {
    return "just now";
  }
  if (diff < 3_600_000) {
    return `${Math.floor(diff / 60_000)}m ago`;
  }
  if (diff < 86_400_000) {
    return `${Math.floor(diff / 3_600_000)}h ago`;
  }

  return new Intl.DateTimeFormat("id-ID", {
    day: "2-digit",
    month: "short",
    year: "numeric"
  }).format(date);
}

export default async function SearchPage({
  searchParams
}: {
  searchParams?: Promise<{ q?: string }>;
}) {
  const params = await (searchParams ?? Promise.resolve({ q: "" }));
  const q = params.q?.trim() ?? "";
  const session = await getSession();
  if (!session) {
    redirect("/login");
  }

  const tenantFilter = session.role === "super_admin" ? {} : { tenantId: session.tenantId };
  const contactScope = q
    ? {
        OR: [{ fullName: { contains: q } }, { phoneNumber: { contains: q } }]
      }
    : {};
  const userScope = q
    ? { OR: [{ fullName: { contains: q } }, { email: { contains: q } }] }
    : {};
  const convoScope = q
    ? { OR: [{ contact: { fullName: { contains: q } } }, { subject: { contains: q } }] }
    : {};

  const [contacts, users, conversations] = await Promise.all([
    prisma.contact.findMany({
      where: q ? { ...tenantFilter, ...contactScope } : tenantFilter,
      orderBy: { lastInteractionAt: "desc" },
      take: q ? 5 : 0
    }),
    prisma.user.findMany({
      where: q ? { ...tenantFilter, ...userScope } : tenantFilter,
      orderBy: { fullName: "asc" },
      take: q ? 5 : 0
    }),
    prisma.conversation.findMany({
      where: q ? { ...tenantFilter, ...convoScope } : tenantFilter,
      include: { contact: true },
      orderBy: { lastMessageAt: "desc" },
      take: q ? 5 : 0
    })
  ]);

  const rows: SearchRow[] = q
    ? [
        ...contacts.map(
          (contact) =>
            [
              "Contact",
              contact.fullName,
              `Last seen: ${toLocale(contact.lastInteractionAt)}`,
              <Link key={`contact-${contact.id}`} href={`/contacts/${contact.id}`} className="text-brand hover:underline">
                View
              </Link>
            ] as SearchRow
        ),
        ...users.map(
          (user) =>
            [
              "User",
              user.fullName,
              `Email: ${user.email}`,
              <Link key={`user-${user.id}`} href={`/team/${user.id}`} className="text-brand hover:underline">
                View
              </Link>
            ] as SearchRow
        ),
        ...conversations.map(
          (conversation) =>
            [
              "Conversation",
              conversation.contact.fullName,
              `Last message: ${toLocale(conversation.lastMessageAt)}`,
              <Link
                key={`conversation-${conversation.id}`}
                href={session.role === "agent" ? `/agent/inbox?conversationId=${conversation.id}` : `/inbox?conversationId=${conversation.id}`}
                className="text-brand hover:underline"
              >
                Open
              </Link>
            ] as SearchRow
        )
      ]
    : [];

  const infoText = q
    ? `${rows.length} hasil untuk "${q}"`
    : "Masukkan keyword di query ?q=... untuk mencari conversation, contact, atau user.";

  return (
    <ShellPage shell="admin" title="Global Search" description="Entry point untuk search conversation, contact, dan user.">
      <p className="rounded-xl border border-line bg-surface-container p-3 text-sm text-on-surface-variant">{infoText}</p>
      <TablePlaceholder title="Search results" columns={["Type", "Name", "Context", "Action"]} rows={rows} />
    </ShellPage>
  );
}