import "server-only";

import { and, eq, ne, or } from "drizzle-orm";
import webPush from "web-push";
import { getDb } from "@/db";
import { commissionPushSubscriptions, users } from "@/db/schema";

export function pushPublicKey() {
  return process.env.WEB_PUSH_PUBLIC_KEY && process.env.WEB_PUSH_PRIVATE_KEY && process.env.WEB_PUSH_SUBJECT
    ? process.env.WEB_PUSH_PUBLIC_KEY : null;
}

export function validPushEndpoint(value: string) {
  try {
    const url = new URL(value);
    const host = url.hostname.toLowerCase();
    return url.protocol === "https:" && !url.username && !url.password &&
      (host === "fcm.googleapis.com" || host === "updates.push.services.mozilla.com" ||
        host === "web.push.apple.com" || host.endsWith(".push.apple.com") ||
        host.endsWith(".notify.windows.com"));
  } catch { return false; }
}

export async function sendCommissionMessagePush(message: {
  id: string; ticketId: string; ticketTitle: string; customerId: string; authorId: string;
  authorName: string; text: string | null;
}) {
  if (!pushPublicKey()) return;
  const subscriptions = await getDb().select({ subscription: commissionPushSubscriptions })
    .from(commissionPushSubscriptions)
    .innerJoin(users, eq(users.id, commissionPushSubscriptions.userId))
    .where(and(ne(commissionPushSubscriptions.userId, message.authorId), eq(users.banned, false),
      or(and(eq(commissionPushSubscriptions.scope, "customer"),
        eq(commissionPushSubscriptions.userId, message.customerId)),
      and(eq(commissionPushSubscriptions.scope, "admin"), eq(users.role, "admin"),
        eq(users.emailVerified, true)))));
  webPush.setVapidDetails(process.env.WEB_PUSH_SUBJECT!, process.env.WEB_PUSH_PUBLIC_KEY!,
    process.env.WEB_PUSH_PRIVATE_KEY!);
  for (let offset = 0; offset < subscriptions.length; offset += 10) {
    await Promise.all(subscriptions.slice(offset, offset + 10).map(async ({ subscription }) => {
      const payload = JSON.stringify({
        id: message.id, title: `${message.authorName} · ${message.ticketTitle}`,
        body: message.text?.slice(0, 300) || "ส่งรูปภาพ",
        url: `/${subscription.scope === "admin" ? "admin/commission" : "commission/tickets"}/${message.ticketId}`,
      });
      try {
        await webPush.sendNotification({ endpoint: subscription.endpoint,
          keys: { p256dh: subscription.p256dh, auth: subscription.auth } }, payload,
        { TTL: 60 * 60 * 24, timeout: 5000 });
      } catch (cause) {
        if (cause && typeof cause === "object" && "statusCode" in cause &&
          (cause.statusCode === 404 || cause.statusCode === 410))
          await getDb().delete(commissionPushSubscriptions)
            .where(eq(commissionPushSubscriptions.endpoint, subscription.endpoint));
      }
    }));
  }
}