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

/* eslint-disable complexity -- These need a lot of logic. */

import { ChannelType } from "discord.js";
// eslint-disable-next-line @typescript-eslint/naming-convention -- Importing a class.
import Parser from "rss-parser";
import { ids } from "../config/ids.js";
import { logger } from "../utils/logger.js";
import type { Amari } from "../interfaces/amari.js";
import type { FreeCodeCampRSS, HackerNewsRSS } from "../interfaces/rss.js";

/**
 * We are completely aware that the contents of this regular expression
 * are a violation of our Code of Conduct. Unfortunately, this is necessary
 * to allow us to filter out the RSS feeds for inappropriate content.
 * We apologise for any distress or harm this line may cause.
 */
const naughtyRegex
// eslint-disable-next-line stylistic/max-len -- Required for filtering.
  = /\b(?:harass(?:ment|ing|ed)?|bully(?:ing)?|discriminat(?:e|ion|ory)|deadnam(?:e|ing)|misgender(?:ing|ed)?|doxx?(?:ing)?|threat(?:en(?:s|ing|ed)?)?|intimidat(?:e|ion|ing)|spam|scam|fraud|phish(?:ing)?|malware|exploit|attack(?:s|ing)?|hate\s*speech|slur|racist|sexist|homophobic|transphobic|ableist|xenophobic|bigot(?:ry|ed)?|troll(?:ing)?|abuse|derogat(?:ory|ing)|offensive|vulgar|obscene|nsfw|porn(?:o|ography)?|sexual(?:ly)?\s*(?:harass|explicit|content)|gore|violent|illegal|pirat(?:e|ed|ing)|crack(?:ed|ing)?|warez|torrent(?:s|ing)?|copyright\s*violat|stolen|leak(?:ed|ing)?\s*(?:data|info|personal)|dox|privacy\s*violat|confidential|unauthorized|solicitation|advertis(?:e|ing|ement)|promot(?:e|ion|ing)|affiliate|referral|spam(?:ming)?|sell(?:ing)?|buy(?:ing)?|commercial|marketing|drug\s*deal(?:er|ing)?|narcotics?|cocaine|heroin|meth(?:amphetamine)?|fentanyl|opiates?|opioids?|carfentanil|mdma|ecstasy|lsd|psilocybin|mushrooms?\s*trip|ketamine|pcp|ghb|rohypnol|roofies?|xanax|percocet|oxyco(?:done|ntin)|vicodin|adderall|ritalin|controlled\s*substance|illicit\s*drug|street\s*drug|drug\s*traffick(?:ing)?|prescription\s*fraud|pill\s*mill|cannabis\s*(?!legal|dispensary)|marijuana\s*(?!legal|dispensary)|weed\s*(?!control|killer)|pot\s*dealer|dope|murder(?:ing|ed)?|kill(?:ing|ed)?\s*(?:someone|person|people)|assassinat(?:e|ion)|homicide|manslaughter|assault(?:ing|ed)?|battery|kidnap(?:ping)?|abduct(?:ion|ed)?|human\s*traffick(?:ing)?|sex\s*traffick(?:ing)?|child\s*abuse|rape|sexual\s*assault|molest(?:ation|ing|ed)?|pedophil(?:e|ia)|child\s*porn|cp\s*(?=\s|$)|csam|robbery|burgl(?:ar|ary)|theft|steal(?:ing)?|shoplifting|embezzl(?:e|ement|ing)|launder(?:ing)?\s*money|extortion|blackmail|bribery|arson|terrorism|terrorist|bomb(?:ing)?|explo(?:sive|ding)|weapon\s*deal|arms\s*traffick|firearm\s*(?=illegal|unregistered)|gun\s*(?=illegal|unregistered)|counterfe(?:it|ing)|forg(?:e|ery|ing)|identity\s*theft|tax\s*evasion|insider\s*trading)\b/i;

/**
 * Used to filter out naughty words from RSS feeds.
 * @param titleOrContent - The title or content to check.
 * @returns True if the title or content is naughty, false if it is clean.
 */
const hasNaughtyWords = (titleOrContent: string): boolean => {
  return naughtyRegex.test(titleOrContent);
};

/**
 * Fetches the RSS feed from freeCodeCamp News and posts the latest updates.
 * @param amari - Amari's instance.
 */
const postFreeCodeCampNews = async(amari: Amari): Promise<void> => {
  try {
    const parser = new Parser<FreeCodeCampRSS, FreeCodeCampRSS["items"]>();
    const { items } = await parser.parseURL(
      "https://www.freecodecamp.org/news/rss",
    );
    if (amari.lastRssItems.freeCodeCamp === null) {
      amari.lastRssItems.freeCodeCamp = items[0]?.guid ?? null;
      return;
    }
    const lastIndex = items.findIndex((item) => {
      return item.guid === amari.lastRssItems.freeCodeCamp;
    });
    const latestPosts
      = lastIndex > -1
        ? items.slice(0, Math.min(lastIndex, 5))
        : items.slice(0, 5);
    const channel
      = amari.discord.channels.cache.get(ids.channels.news)
      ?? await amari.discord.channels.fetch(ids.channels.news);
    if (channel === null) {
      throw new Error("Cannot find news channel.");
    }
    if (!channel.isSendable()) {
      throw new Error("News channel is not sendable.");
    }
    if (amari.lastRssItems.freeCodeCamp !== items[0]?.guid) {
      amari.lastRssItems.freeCodeCamp = items[0]?.guid ?? null;
    }
    await Promise.all(
      latestPosts.map(async(post) => {
        if (
          hasNaughtyWords(post.title)
          || hasNaughtyWords(post.contentSnippet)
          || hasNaughtyWords(post.content)
        ) {
          return;
        }
        const sent = await channel.send(post.link);
        if (channel.type === ChannelType.GuildAnnouncement) {
          await sent.crosspost();
        }
      }),
    );
  } catch (error) {
    if (error instanceof Error) {
      await logger.error("post freecodecamp news module", error);
    }
  }
};

/**
 * Fetches the RSS feed from HackerNews and posts the latest updates.
 * @param amari - Amari's instance.
 */
const postHackerNews = async(amari: Amari): Promise<void> => {
  try {
    const parser = new Parser<HackerNewsRSS, HackerNewsRSS["items"]>();
    const { items } = await parser.parseURL(
      "https://hnrss.org/newest?link=comments",
    );
    if (amari.lastRssItems.hackerNews === null) {
      amari.lastRssItems.hackerNews = items[0]?.guid ?? null;
      return;
    }
    const lastIndex = items.findIndex((item) => {
      return item.guid === amari.lastRssItems.hackerNews;
    });
    const latestPosts
      = lastIndex > -1
        ? items.slice(0, Math.min(lastIndex, 5))
        : items.slice(0, 5);
    const channel
      = amari.discord.channels.cache.get(ids.channels.news)
      ?? await amari.discord.channels.fetch(ids.channels.news);
    if (channel === null) {
      throw new Error("Cannot find news channel.");
    }
    if (!channel.isSendable()) {
      throw new Error("News channel is not sendable.");
    }
    if (amari.lastRssItems.hackerNews !== latestPosts[0]?.guid) {
      amari.lastRssItems.hackerNews = latestPosts[0]?.guid ?? null;
    }
    await Promise.all(
      latestPosts.map(async(post) => {
        const sent = await channel.send(post.link);
        if (channel.type === ChannelType.GuildAnnouncement) {
          await sent.crosspost();
        }
      }),
    );
  } catch (error) {
    if (error instanceof Error) {
      await logger.error("post hackernews module", error);
    }
  }
};

export { postFreeCodeCampNews, postHackerNews };