/**
 * @copyright nhcarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */

import { TwitterApi } from "twitter-api-v2";

/**
 * Forwards an announcement to our Twitter account.
 * @param content - The main body of the announcement.
 * @returns A message indicating the success or failure of the operation.
 */
export const announceOnTwitter
 = async(content: Array<string>): Promise<string> => {
   if (
     process.env.TWITTER_CONSUMER_KEY === undefined
    || process.env.TWITTER_CONSUMER_SECRET === undefined
    || process.env.TWITTER_TOKEN === undefined
    || process.env.TWITTER_SECRET === undefined
   ) {
     return "Twitter credentials are not set.";
   }
   const twitterClient = new TwitterApi({
     accessSecret: process.env.TWITTER_SECRET,
     accessToken:  process.env.TWITTER_TOKEN,
     appKey:       process.env.TWITTER_CONSUMER_KEY,
     appSecret:    process.env.TWITTER_CONSUMER_SECRET,
   });

   const [ firstPost, ...restOfPosts ] = content;
   const failedReplies: Array<string> = [];
   if (firstPost === undefined) {
     return "No posts to send to Twitter.";
   }
   const result = await twitterClient.v2.
     tweet(firstPost).
     catch((error: unknown) => {
       return error instanceof Error
         ? error.message
         : String(error);
     });
   if (typeof result === "string") {
     return `Failed to send message to Twitter. ${result}`;
   }
   let { id } = result.data;
   for (const post of restOfPosts) {
     // eslint-disable-next-line no-await-in-loop -- We need to do this sequentially.
     const twitterResponse = await twitterClient.v2.reply(post, id);
     if (typeof twitterResponse !== "string") {
       const { id: replyId } = twitterResponse.data;
       id = replyId;
       continue;
     }
     failedReplies.push(post);
   }
   return `Successfully sent initial post to Twitter. ${failedReplies.length > 0
     ? `Failed to send ${failedReplies.length.toString()} replies: ${failedReplies.join(", ")}`
     : `All ${(content.length - 1).toString()} replies were sent successfully.`}`;
 };