/**
 * @copyright nhcarrigan
 * @license Naomi's Public License
 * @author Naomi Carrigan
 */
/* eslint-disable @typescript-eslint/naming-convention -- we are making raw API calls. */
/* eslint-disable no-await-in-loop -- Sequential chunk posting requires awaiting each request. */
/* eslint-disable max-lines-per-function -- Chunked posting requires more logic. */

import { chunkContent } from "../utils/chunkContent.js";
import type { AnnouncementType } from "../interfaces/announcementType.js";

const announcementCategoryId = 16;
const discourseLimit = 32_000;

const tags: Record<AnnouncementType, string> = {
  community: "Community",
  company:   "Company",
  products:  "Products",
};

/**
 * Posts an announcement to the NHCarrigan Discourse support forum.
 * Sends overflow content as sequential replies if it exceeds the 32,000 character limit.
 * @param title - The title of the announcement.
 * @param content - The main body of the announcement in markdown.
 * @param type - Whether the announcement is for a product, community, or company.
 * @returns A message indicating the success or failure of the operation.
 */
export const announceOnDiscourse = async(
  title: string,
  content: string,
  type: AnnouncementType,
): Promise<string> => {
  if (process.env.FORUM_API_KEY === undefined) {
    return "Discourse API key is not set.";
  }

  const chunks = chunkContent(content, discourseLimit);
  const firstChunk = chunks[0] ?? "";
  const remainingChunks = chunks.slice(1);

  const response = await fetch("https://support.nhcarrigan.com/posts.json", {
    body: JSON.stringify({
      category: announcementCategoryId,
      raw:      firstChunk,
      tags:     [ tags[type] ],
      title:    title,
    }),
    headers: {
      "Api-Key":      process.env.FORUM_API_KEY,
      "Api-Username": "hikari",
      "Content-Type": "application/json",
    },
    method: "POST",
  });

  if (!response.ok) {
    return `Failed to post to Discourse. Status: ${response.status.toString()} ${response.statusText}`;
  }

  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions -- Fetch does not accept generic.
  const data = (await response.json()) as { topic_id?: number };

  for (const chunk of remainingChunks) {
    if (data.topic_id === undefined) {
      return "Failed to retrieve Discourse topic ID for continuation posts.";
    }

    const replyResponse = await fetch(
      "https://support.nhcarrigan.com/posts.json",
      {
        body: JSON.stringify({
          raw:      chunk,
          topic_id: data.topic_id,
        }),
        headers: {
          "Api-Key":      process.env.FORUM_API_KEY,
          "Api-Username": "hikari",
          "Content-Type": "application/json",
        },
        method: "POST",
      },
    );

    if (!replyResponse.ok) {
      return `Failed to post continuation chunk to Discourse. Status: ${replyResponse.status.toString()} ${replyResponse.statusText}`;
    }
  }

  return "Successfully posted announcement to Discourse~! ✨";
};