import type { ResolvedSlackAccount } from "../accounts.js";
import type { SlackMessageEvent } from "../types.js";
import type { SlackMonitorContext } from "./context.js";
import { dispatchPreparedSlackMessage } from "./message-handler/dispatch.js";
import { prepareSlackMessage } from "./message-handler/prepare.js";

export type SlackMessageHandler = (
  message: SlackMessageEvent,
  opts: { source: "message" | "app_mention"; wasMentioned?: boolean },
) => Promise<void>;

export function createSlackMessageHandler(params: {
  ctx: SlackMonitorContext;
  account: ResolvedSlackAccount;
}): SlackMessageHandler {
  const { ctx, account } = params;

  return async (message, opts) => {
    if (opts.source === "message" && message.type !== "message") return;
    if (
      opts.source === "message" &&
      message.subtype &&
      message.subtype !== "file_share" &&
      message.subtype !== "bot_message"
    ) {
      return;
    }
    if (ctx.markMessageSeen(message.channel, message.ts)) return;
    const prepared = await prepareSlackMessage({ ctx, account, message, opts });
    if (!prepared) return;
    await dispatchPreparedSlackMessage(prepared);
  };
}