import { Op } from "sequelize";
import {
  Blocks,
  Emoji,
  FederatedHost,
  Media,
  Post,
  PostMentionsUserRelation,
  ServerBlock,
  PostTag,
  User,
  sequelize,
  Ask,
  Notification,
  EmojiReaction,
  PostAncestor,
  PostReport,
  QuestionPoll,
  Quotes,
  RemoteUserPostView,
  SilencedPost,
  UserBitesPostRelation,
  UserBookmarkedPosts,
  UserLikesPostRelations,
} from "../../models/index.js";
import { completeEnvironment } from "../backendOptions.js";
import { logger } from "../logger.js";
import { getRemoteActor } from "./getRemoteActor.js";
import { getPetitionSigned } from "./getPetitionSigned.js";
import { fediverseTag } from "../../interfaces/fediverse/tags.js";
import { loadPoll } from "./loadPollFromPost.js";
import { getApObjectPrivacy } from "./getPrivacy.js";
import dompurify from "isomorphic-dompurify";
import { Queue } from "bullmq";
import { bulkCreateNotifications } from "../pushNotifications.js";
import { getDeletedUser } from "../cacheGetters/getDeletedUser.js";
import { Privacy } from "../../models/post.js";
import {
  getAtProtoThread,
  getPostThreadSafe,
  processSinglePost,
} from "../../atproto/utils/getAtProtoThread.js";
import * as cheerio from "cheerio";
import {
  PostView,
  ThreadViewPost,
} from "@atproto/api/dist/client/types/app/bsky/feed/defs.js";
import { getAdminUser } from "../getAdminAndDeletedUser.js";

const updateMediaDataQueue = new Queue("processRemoteMediaData", {
  connection: completeEnvironment.bullmqConnection,
  defaultJobOptions: {
    removeOnComplete: true,
    attempts: 3,
    backoff: {
      type: "exponential",
      delay: 1000,
    },
    removeOnFail: true,
  },
});

async function getPostThreadRecursive(
  user: any,
  remotePostId: string | null,
  remotePostObject?: any,
  localPostToForceUpdate?: string,
  options?: any
) {
  if (remotePostId === null) return;

  const deletedUser = getDeletedUser();
  try {
    remotePostId.startsWith(
      `${completeEnvironment.frontendUrl}/fediverse/post/`
    );
  } catch (error) {
    logger.info({
      message: "Error with url on post",
      object: remotePostId,
      stack: new Error().stack,
    });
    return;
  }
  if (
    remotePostId.startsWith(
      `${completeEnvironment.frontendUrl}/fediverse/post/`
    )
  ) {
    // we are looking at a local post
    const partToRemove = `${completeEnvironment.frontendUrl}/fediverse/post/`;
    const postId = remotePostId.substring(partToRemove.length);
    return await Post.findOne({
      where: {
        id: postId,
      },
    });
  }
  if (completeEnvironment.enableBsky && remotePostId.startsWith("at://")) {
    // Bluesky post. Likely coming from an import
    const postInDatabase = await Post.findOne({
      where: {
        bskyUri: remotePostId,
      },
    });
    if (postInDatabase) {
      return postInDatabase;
    } else if (!remotePostObject) {
      const postId = await getAtProtoThread(remotePostId);
      return await Post.findByPk(postId);
    }
  }
  const postInDatabase = await Post.findOne({
    where: {
      remotePostId: remotePostId,
    },
  });
  if (postInDatabase && !localPostToForceUpdate) {
    if (postInDatabase.remotePostId) {
      const parentPostPetition = await getPetitionSigned(
        user,
        postInDatabase.remotePostId
      );
      if (parentPostPetition) {
        await loadPoll(parentPostPetition, postInDatabase, user);
      }
    }
    return postInDatabase;
  } else {
    try {
      const postPetition = remotePostObject
        ? remotePostObject
        : await getPetitionSigned(user, remotePostId);
      if (postPetition && !localPostToForceUpdate) {
        const remotePostInDatabase = await Post.findOne({
          where: {
            remotePostId: postPetition.id,
          },
        });
        if (remotePostInDatabase) {
          if (remotePostInDatabase.remotePostId) {
            const parentPostPetition = await getPetitionSigned(
              user,
              remotePostInDatabase.remotePostId
            );
            if (parentPostPetition) {
              await loadPoll(parentPostPetition, remotePostInDatabase, user);
            }
          }
          return remotePostInDatabase;
        }
      }
      // peertube: what the fuck
      let actorUrl = postPetition.attributedTo;
      if (Array.isArray(actorUrl)) {
        actorUrl = actorUrl[0].id;
      }
      const remoteUser = await getRemoteActor(actorUrl, user);
      if (remoteUser) {
        const remoteHost = (await FederatedHost.findByPk(
          remoteUser.federatedHostId as string
        )) as FederatedHost;
        const remoteUserServerBaned = remoteHost?.blocked
          ? remoteHost.blocked
          : false;
        // HACK: some implementations (GTS IM LOOKING AT YOU) may send a single element instead of an array
        // I should had used a funciton instead of this dirty thing, BUT you see, its late. Im eepy
        // also this code is CRITICAL. A failure here is a big problem. So this hack it is
        postPetition.tag = !Array.isArray(postPetition.tag)
          ? [postPetition.tag].filter((elem) => elem)
          : postPetition.tag;
        const medias: any[] = [];
        const fediTags: fediverseTag[] = [
          ...new Set<fediverseTag>(
            postPetition.tag
              ?.filter((elem: fediverseTag) =>
                [
                  postPetition.tag.some(
                    (tag: fediverseTag) => tag.type == "WafrnHashtag"
                  )
                    ? "WafrnHashtag"
                    : "Hashtag",
                ].includes(elem.type)
              )
              .map((elem: fediverseTag) => {
                return { href: elem.href, type: elem.type, name: elem.name };
              })
          ),
        ];
        let fediMentions: fediverseTag[] = postPetition.tag?.filter(
          (elem: fediverseTag) => elem.type === "Mention"
        );
        if (fediMentions == undefined) {
          fediMentions = postPetition.to.map((elem: string) => {
            return { href: elem };
          });
        }
        const fediEmojis: any[] = postPetition.tag?.filter(
          (elem: fediverseTag) => elem.type === "Emoji"
        );

        const privacy = getApObjectPrivacy(postPetition, remoteUser);

        let postTextContent = `${
          postPetition.content ? postPetition.content : ""
        }`; // Fix for bridgy giving this as undefined
        if (postPetition.type == "Video") {
          // peertube federation. We just add a link to the video, federating this is HELL
          postTextContent =
            postTextContent +
            ` <a href="${postPetition.id}" target="_blank">${postPetition.id}</a>`;
        }
        if (
          postPetition.tag &&
          postPetition.tag.some(
            (tag: fediverseTag) => tag.type === "WafrnHashtag"
          )
        ) {
          // Ok we have wafrn hashtags with us, we are probably talking with another wafrn! Crazy, I know
          const dom = cheerio.load(postTextContent);
          const tags = dom("a.hashtag").html("");
          postTextContent = dom.html();
        }
        if (
          postPetition.attachment &&
          postPetition.attachment.length > 0 &&
          (!remoteUser.banned || options?.allowMediaFromBanned)
        ) {
          for await (const remoteFile of postPetition.attachment) {
            if (remoteFile.type !== "Link") {
              const wafrnMedia = await Media.create({
                url: remoteFile.url,
                NSFW: postPetition?.sensitive,
                userId:
                  remoteUserServerBaned || remoteUser.banned
                    ? (
                        await deletedUser
                      )?.id
                    : remoteUser.id,
                description: remoteFile.name,
                ipUpload: "IMAGE_FROM_OTHER_FEDIVERSE_INSTANCE",
                mediaOrder: postPetition.attachment.indexOf(remoteFile), // could be non consecutive but its ok
                external: true,
                mediaType: remoteFile.mediaType ? remoteFile.mediaType : "",
                blurhash: remoteFile.blurhash ? remoteFile.blurhash : null,
                height: remoteFile.height ? remoteFile.height : null,
                width: remoteFile.width ? remoteFile.width : null,
              });
              if (
                !wafrnMedia.mediaType ||
                (wafrnMedia.mediaType?.startsWith("image") && !wafrnMedia.width)
              ) {
                await updateMediaDataQueue.add(`updateMedia:${wafrnMedia.id}`, {
                  mediaId: wafrnMedia.id,
                });
              }
              medias.push(wafrnMedia);
            } else {
              postTextContent =
                "" +
                postTextContent +
                `<a href="${remoteFile.href}" >${remoteFile.href}</a>`;
            }
          }
        }
        const lemmyName = postPetition.name ? postPetition.name : "";
        postTextContent = postTextContent
          ? postTextContent
          : `<p>${lemmyName}</p>`;
        let createdAt = new Date(postPetition.published);
        if (createdAt.getTime() > new Date().getTime()) {
          createdAt = new Date();
        }

        let bskyUri: string | undefined, bskyCid: string | undefined;
        let existingBskyPost: Post | undefined;
        // check if it's a bridgy post or a post from a wafrn by checking a valid FEP-fffd
        if (postPetition.url && Array.isArray(postPetition.url)) {
          const url = postPetition.url as Array<
            string | { type: string; href: string }
          >;
          const firstFffd = url.find((x) => typeof x !== "string");
          // check if it starts at at:// then its a bridged post, we do not touch it if it's not
          if (firstFffd && firstFffd.href.startsWith("at://")) {
            // get it's bsky counterparts first, we need the cid
            const thread = await getPostThreadSafe({
              uri: firstFffd.href,
            });
            if (thread && thread.success) {
              try {
                const threadView = thread.data.thread as ThreadViewPost;
                bskyCid = threadView.post.cid;
                bskyUri = threadView.post.uri;
                // check if it cames from wafrn
                if (
                  !(
                    threadView.post.record as {
                      fediverseId: string | undefined;
                    }
                  ).fediverseId
                ) {
                  // this is a bridgy fed post, assume main post is on bsky, use bsky user
                  const postId = await processSinglePost(threadView.post);
                  if (postId) {
                    const post = await Post.findByPk(postId);
                    if (post) {
                      post.remotePostId = postPetition.id;
                      await post.save();
                      return post;
                    }
                  }
                } else {
                  // now this is a wafrn post, where we do a thing little bit different
                  // first we going to check if the post is already on db because this can break everything
                  let existingPost = await Post.findOne({
                    where: {
                      bskyCid: threadView.post.cid,
                      remotePostId: null,
                    },
                  });
                  if (existingPost) {
                    existingBskyPost = existingPost;
                    // do not attempt to merge it right now, this will crash backend
                    bskyCid = undefined;
                    bskyUri = undefined;
                  }
                }
              } catch {}
            }
          }
        }

        const postToCreate: any = {
          content: "" + postTextContent,
          content_warning: postPetition.summary
            ? postPetition.summary
            : remoteUser.NSFW
            ? "User is marked as NSFW by this instance staff. Possible NSFW without tagging"
            : "",
          createdAt: createdAt,
          updatedAt: createdAt,
          userId:
            remoteUserServerBaned || remoteUser.banned
              ? (await deletedUser)?.id
              : remoteUser.id,
          remotePostId: postPetition.id,
          privacy: privacy,
          bskyUri: postPetition.blueskyUri,
          displayUrl: Array.isArray(postPetition.url)
            ? postPetition.url[0]
            : postPetition.url,
          bskyCid: postPetition.blueskyCid,
          ...(bskyCid && bskyUri
            ? {
                bskyCid,
                bskyUri,
              }
            : {}),
        };

        if (postPetition.name) {
          postToCreate.title = postPetition.name;
        }

        const mentionedUsersIds: string[] = [];
        const quotes: any[] = [];
        try {
          if (!remoteUser.banned && !remoteUserServerBaned) {
            for await (const mention of fediMentions) {
              let mentionedUser;
              if (
                mention.href?.indexOf(completeEnvironment.frontendUrl) !== -1
              ) {
                const username = mention.href?.substring(
                  `${completeEnvironment.frontendUrl}/fediverse/blog/`.length
                ) as string;
                mentionedUser = await User.findOne({
                  where: sequelize.where(
                    sequelize.fn("lower", sequelize.col("url")),
                    username.toLowerCase()
                  ),
                });
              } else {
                mentionedUser = await getRemoteActor(mention.href, user);
              }
              if (
                mentionedUser?.id &&
                mentionedUser.id != (await deletedUser)?.id &&
                !mentionedUsersIds.includes(mentionedUser.id)
              ) {
                mentionedUsersIds.push(mentionedUser.id);
              }
            }
          }
        } catch (error) {
          logger.info({ message: "problem processing mentions", error });
        }

        if (
          postPetition.inReplyTo &&
          postPetition.id !== postPetition.inReplyTo
        ) {
          const parent = await getPostThreadRecursive(
            user,
            postPetition.inReplyTo.id
              ? postPetition.inReplyTo.id
              : postPetition.inReplyTo
          );
          postToCreate.parentId = parent?.id;
        }

        const existingPost = localPostToForceUpdate
          ? await Post.findByPk(localPostToForceUpdate)
          : undefined;

        if (existingPost) {
          existingPost.set(postToCreate);
          await existingPost.save();
          await loadPoll(postPetition, existingPost, user);
        }

        const newPost = existingPost
          ? existingPost
          : await Post.create(postToCreate);
        try {
          if (!remoteUser.banned && !remoteUserServerBaned && fediEmojis) {
            processEmojis(newPost, fediEmojis);
          }
        } catch (error) {
          logger.debug("Problem processing emojis");
        }
        newPost.setMedias(medias);
        try {
          if (postPetition.quote || postPetition.quoteUrl) {
            const urlQuote = postPetition.quoteUrl || postPetition.quote;
            const postToQuote = await getPostThreadRecursive(user, urlQuote);
            if (postToQuote && postToQuote.privacy != Privacy.DirectMessage) {
              quotes.push(postToQuote);
            }
            if (!postToQuote) {
              postToCreate.content =
                postToCreate.content + `<p>RE: ${urlQuote}</p>`;
            }
            const postsToQuotePromise: any[] = [];
            postPetition.tag
              ?.filter((elem: fediverseTag) => elem.type === "Link")
              .forEach((quote: fediverseTag) => {
                postsToQuotePromise.push(
                  getPostThreadRecursive(user, quote.href as string)
                );
                postToCreate.content = postToCreate.content.replace(
                  quote.name,
                  ""
                );
              });
            const quotesToAdd = await Promise.allSettled(postsToQuotePromise);
            const quotesThatWillGetAdded = quotesToAdd.filter(
              (elem) =>
                elem.status === "fulfilled" &&
                elem.value &&
                elem.value.privacy !== 10
            );
            quotesThatWillGetAdded.forEach((quot) => {
              if (
                quot.status === "fulfilled" &&
                !quotes.map((q) => q.id).includes(quot.value.id)
              ) {
                quotes.push(quot.value);
              }
            });
          }
        } catch (error) {
          logger.info("Error processing quotes");
          logger.debug(error);
        }
        newPost.setQuoted(quotes);

        await newPost.save();

        await bulkCreateNotifications(
          quotes.map((quote) => ({
            notificationType: "QUOTE",
            notifiedUserId: quote.userId,
            userId: newPost.userId,
            postId: newPost.id,
            createdAt: new Date(newPost.createdAt),
          })),
          {
            postContent: newPost.content,
            userUrl: remoteUser.url,
          }
        );
        try {
          if (!remoteUser.banned && !remoteUserServerBaned) {
            await addTagsToPost(newPost, fediTags);
          }
        } catch (error) {
          logger.info("problem processing tags");
        }
        try {
          await addAsksToPost(newPost, fediTags);
        } catch (error) {}
        if (mentionedUsersIds.length != 0) {
          await processMentions(newPost, mentionedUsersIds);
        }
        await loadPoll(remotePostObject, newPost, user);
        const postCleanContent = dompurify
          .sanitize(newPost.content, { ALLOWED_TAGS: [] })
          .trim();
        const mentions = await newPost.getMentionPost();
        if (postCleanContent.startsWith("!ask") && mentions.length === 1) {
          let askContent = postCleanContent.split(
            `!ask @${mentions[0].url}`
          )[1];
          if (askContent.startsWith("@" + completeEnvironment.instanceUrl)) {
            askContent = askContent.split(
              "@" + completeEnvironment.instanceUrl
            )[1];
          }
          await Ask.create({
            question: askContent,
            userAsker: newPost.userId,
            userAsked: mentions[0].id,
            answered: false,
            apObject: JSON.stringify(postPetition),
          });
        }

        if (existingBskyPost) {
          // very expensive updates! but only happens when bsky
          // post is already on db but the fedi post is not
          await EmojiReaction.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await Notification.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await PostReport.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          try {
            await PostAncestor.update(
              {
                postsId: newPost.id,
              },
              {
                where: {
                  postsId: existingBskyPost.id,
                },
              }
            );
          } catch {}
          await QuestionPoll.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await Quotes.update(
            {
              quoterPostId: newPost.id,
            },
            {
              where: {
                quoterPostId: existingBskyPost.id,
              },
            }
          );
          if (
            !(await Quotes.findOne({
              where: {
                quotedPostId: newPost.id,
              },
            }))
          ) {
            await Quotes.update(
              {
                quotedPostId: newPost.id,
              },
              {
                where: {
                  quotedPostId: existingBskyPost.id,
                },
              }
            );
          }
          await RemoteUserPostView.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await SilencedPost.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await SilencedPost.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await UserBitesPostRelation.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await UserBookmarkedPosts.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await UserLikesPostRelations.update(
            {
              postId: newPost.id,
            },
            {
              where: {
                postId: existingBskyPost.id,
              },
            }
          );
          await Post.update(
            {
              parentId: newPost.id,
            },
            {
              where: {
                parentId: existingBskyPost.id,
              },
            }
          );

          // now we delete the existing bsky post
          await existingBskyPost.destroy();

          // THEN we merge it
          newPost.bskyCid = existingBskyPost.bskyCid;
          newPost.bskyUri = existingBskyPost.bskyUri;
          await newPost.save();
        }

        return newPost;
      }
    } catch (error) {
      logger.trace({
        message: "error getting remote post",
        url: remotePostId,
        user: user.url,
        problem: error,
      });
      return null;
    }
  }
}

async function addAsksToPost(post: Post, tags: fediverseTag[]) {
  const asks = tags.filter((elem) => elem.type === "AskQuestion");
  if (asks.length) {
    const ask = asks[0];
    const userAsker = await getRemoteActor(
      ask.actor as string,
      await getAdminUser()
    );
    const textToRemove = ask.representation as string;
    const askText = ask.name;
    if (textToRemove) {
      post.content = post.content.replace(textToRemove, "");
      await Ask.create({
        answered: true,
        postId: post.id,
        userAsker: userAsker ? userAsker.id : undefined,
        userAsked: post.userId,
      });
      await post.save();
    }
  }
}

async function addTagsToPost(post: any, originalTags: fediverseTag[]) {
  let tags = [...originalTags];
  const res = await post.setPostTags([]);
  if (tags.some((elem) => elem.name == "WafrnHashtag")) {
    tags = tags.filter((elem) => elem.name == "WafrnHashtag");
  }
  return await PostTag.bulkCreate(
    tags
      .filter((elem) => elem && post && elem.name && post.id)
      .map((elem) => {
        return {
          tagName: elem?.name?.replace("#", ""),
          postId: post.id,
        };
      })
  );
}

async function processMentions(post: any, userIds: string[]) {
  await post.setMentionPost([]);
  await Notification.destroy({
    where: {
      notificationType: "MENTION",
      postId: post.id,
    },
  });
  const blocks = await Blocks.findAll({
    where: {
      blockerId: {
        [Op.in]: userIds,
      },
      blockedId: post.userId,
    },
  });
  const remoteUser = await User.findByPk(post.userId, {
    attributes: ["url", "federatedHostId"],
  });
  const userServerBlocks = await ServerBlock.findAll({
    where: {
      userBlockerId: {
        [Op.in]: userIds,
      },
      blockedServerId: remoteUser?.federatedHostId || "",
    },
  });
  const blockerIds: string[] = blocks
    .map((block: any) => block.blockerId)
    .concat(userServerBlocks.map((elem: any) => elem.userBlockerId));

  await bulkCreateNotifications(
    userIds.map((mentionedUserId) => ({
      notificationType: "MENTION",
      notifiedUserId: mentionedUserId,
      userId: post.userId,
      postId: post.id,
      createdAt: new Date(post.createdAt),
    })),
    {
      postContent: post.content,
      userUrl: remoteUser?.url,
    }
  );

  return await PostMentionsUserRelation.bulkCreate(
    userIds
      .filter((elem) => !blockerIds.includes(elem))
      .map((elem) => {
        return {
          postId: post.id,
          userId: elem,
        };
      }),
    {
      ignoreDuplicates: true,
    }
  );
}

async function processEmojis(post: any, fediEmojis: any[]) {
  let emojis: any[] = [];
  let res: any;
  const emojiIds: string[] = Array.from(
    new Set(fediEmojis.map((emoji: any) => emoji.id))
  );
  const foundEmojis = await Emoji.findAll({
    where: {
      id: {
        [Op.in]: emojiIds,
      },
    },
  });
  foundEmojis.forEach((emoji: any) => {
    const newData = fediEmojis.find(
      (foundEmoji: any) => foundEmoji.id === emoji.id
    );
    if (newData && newData.icon?.url) {
      emoji.set({
        url: newData.icon.url,
      });
      emoji.save();
    } else {
      logger.debug("issue with emoji");
      logger.debug(emoji);
      logger.debug(newData);
    }
  });
  emojis = emojis.concat(foundEmojis);
  const notFoundEmojis = fediEmojis.filter(
    (elem: any) => !foundEmojis.find((found: any) => found.id === elem.id)
  );
  if (fediEmojis && notFoundEmojis && notFoundEmojis.length > 0) {
    try {
      const newEmojis = notFoundEmojis.map((newEmoji: any) => {
        return {
          id: newEmoji.id ? newEmoji.id : newEmoji.name + newEmoji.icon?.url,
          name: newEmoji.name,
          external: true,
          url: newEmoji.icon?.url,
        };
      });
      emojis = emojis.concat(
        await Emoji.bulkCreate(newEmojis, { ignoreDuplicates: true })
      );
    } catch (error) {
      logger.debug("Error with emojis");
      logger.debug(error);
    }
  }

  return await post.setEmojis(emojis);
}

export { getPostThreadRecursive };