import { nanoid } from "nanoid";
import invariant from "tiny-invariant";
import { SKALOP_TOKEN_HEADER_NAME } from "~/constants";
import type { ChatMessage } from "./chat-types";

type PartialChatMessage = Pick<
  ChatMessage,
  "type" | "context" | "room" | "revalidateOnly"
>;
interface NotificationService {
  notify: (msg: PartialChatMessage | PartialChatMessage[]) => undefined;
}

invariant(
  process.env["SKALOP_SYSTEM_MESSAGE_URL"],
  "Missing env var: SKALOP_SYSTEM_MESSAGE_URL",
);
invariant(process.env["SKALOP_TOKEN"], "Missing env var: SKALOP_TOKEN");

export const notify: NotificationService["notify"] = (partialMsg) => {
  const msgArr = Array.isArray(partialMsg) ? partialMsg : [partialMsg];

  const fullMessages: ChatMessage[] = msgArr.map((partialMsg) => {
    return {
      id: nanoid(),
      timestamp: Date.now(),
      room: partialMsg.room,
      context: partialMsg.context,
      type: partialMsg.type,
      revalidateOnly: partialMsg.revalidateOnly,
    };
  });

  return void fetch(process.env["SKALOP_SYSTEM_MESSAGE_URL"]!, {
    method: "POST",
    body: JSON.stringify(fullMessages),
    headers: [[SKALOP_TOKEN_HEADER_NAME, process.env["SKALOP_TOKEN"]!]],
  }).catch(console.error);
};