"use server";

import { Filter, MongoClient } from "mongodb";
import type {
  AccountStrike,
  Bot,
  Channel,
  Message,
  Report,
  Server,
  SnapshotContent,
  User,
} from "revolt-api";
import { ulid } from "ulid";
import { publishMessage } from "./redis";

let client: MongoClient;

function mongo() {
  if (!client) {
    client = new MongoClient(process.env.MONGODB!);
  }

  return client;
}

export default mongo;

export async function fetchBotById(id: string) {
  return await mongo()
    .db("revolt")
    .collection<Bot>("bots")
    .findOne({ _id: id });
}

export async function fetchUserById(id: string) {
  return await mongo()
    .db("revolt")
    .collection<User>("users")
    .findOne({ _id: id });
}

export async function fetchUsersById(ids: string[]) {
  return await mongo()
    .db("revolt")
    .collection<User>("users")
    .find({ _id: { $in: ids } })
    .toArray();
}

export async function fetchChannelById(id: string) {
  return await mongo()
    .db("revolt")
    .collection<Channel>("channels")
    .findOne({ _id: id });
}

export async function fetchChannels(query: Filter<Channel>) {
  return await mongo()
    .db("revolt")
    .collection<Channel>("channels")
    .find(query)
    .toArray();
}

export async function updateLastMessageId(
  channelId: string,
  messageId: string
) {
  return await mongo()
    .db("revolt")
    .collection<Channel>("channels")
    .updateOne({ _id: channelId }, { $set: { last_message_id: messageId } });
}

export async function findDM(user_a: string, user_b: string) {
  return await mongo()
    .db("revolt")
    .collection<Channel & { channel_type: "DirectMessage" }>("channels")
    .findOne({
      channel_type: "DirectMessage",
      recipients: {
        $all: [user_a, user_b],
      },
    });
}

export async function createDM(
  userA: string,
  userB: string,
  lastMessageId?: string
) {
  const newChannel: Channel & { channel_type: "DirectMessage" } = {
    _id: ulid(),
    channel_type: "DirectMessage",
    active: typeof lastMessageId !== "undefined",
    recipients: [userA, userB],
  };

  await mongo()
    .db("revolt")
    .collection<Channel & { channel_type: "DirectMessage" }>("channels")
    .insertOne(newChannel);

  await publishMessage(userA + "!", {
    type: "ChannelCreate",
    ...newChannel,
  });

  await publishMessage(userB + "!", {
    type: "ChannelCreate",
    ...newChannel,
  });

  return newChannel;
}

export async function fetchServerById(id: string) {
  return await mongo()
    .db("revolt")
    .collection<Server>("servers")
    .findOne({ _id: id });
}

export async function fetchServers(query: Filter<Server>) {
  return await mongo()
    .db("revolt")
    .collection<Server>("servers")
    .find(query)
    .toArray();
}

export async function fetchMessageById(id: string) {
  return await mongo()
    .db("revolt")
    .collection<Message>("messages")
    .findOne({ _id: id });
}

export async function fetchMessages(query: Filter<Message>, limit = 50) {
  return await mongo()
    .db("revolt")
    .collection<Message>("messages")
    .find(query, { sort: { _id: -1 }, limit })
    .toArray();
}

export async function fetchReports(
  query: Filter<Report> = { status: "Created" }
) {
  return await mongo()
    .db("revolt")
    .collection<Report>("safety_reports")
    .find(query as never, {
      sort: {
        _id: -1,
      },
    })
    .toArray();
}

export async function fetchReportById(id: string) {
  return await mongo()
    .db("revolt")
    .collection<Report>("safety_reports")
    .findOne({ _id: id });
}

export async function fetchMembershipsByUser(userId: string) {
  return await mongo()
    .db("revolt")
    .collection<{ _id: { user: string; server: string } }>("server_members")
    .find({ "_id.user": userId })
    .toArray();
}

export async function fetchSnapshots(
  query: Filter<{ _id: string; report_id: string; content: SnapshotContent }>
) {
  return await mongo()
    .db("revolt")
    .collection<{ _id: string; report_id: string; content: SnapshotContent }>(
      "safety_snapshots"
    )
    .find(query)
    .toArray();
}

export async function fetchSnapshotsByReport(reportId: string) {
  return await mongo()
    .db("revolt")
    .collection<{ content: SnapshotContent }>("safety_snapshots")
    .find({ report_id: reportId })
    .toArray()
    .then((snapshots) => snapshots.map((snapshot) => snapshot!.content));
}

export async function fetchStrikesByUser(userId: string) {
  return await mongo()
    .db("revolt")
    .collection<AccountStrike>("safety_strikes")
    .find({ user_id: userId })
    .toArray();
}

export async function fetchBotsByUser(userId: string) {
  return await mongo()
    .db("revolt")
    .collection<Bot>("bots")
    .find({ owner: userId })
    .toArray();
}