import { useEffect, useMemo } from "react";
import { useDispatch, useSelector } from "react-redux";

import { makeNotification } from "Notifications";
import { TaggedRawEvent, HexKey, Lists } from "Nostr";
import EventKind from "Nostr/EventKind";
import Event from "Nostr/Event";
import { Subscriptions } from "Nostr/Subscriptions";
import { addDirectMessage, setFollows, setRelays, setMuted, setBlocked, sendNotification } from "State/Login";
import { RootState } from "State/Store";
import { mapEventToProfile, MetadataCache } from "State/Users";
import { useDb } from "State/Users/Db";
import useSubscription from "Feed/Subscription";
import { barierNip07 } from "Feed/EventPublisher";
import { getMutedKeys, getNewest } from "Feed/MuteList";
import useModeration from "Hooks/useModeration";

/**
 * Managed loading data for the current logged in user
 */
export default function useLoginFeed() {
  const dispatch = useDispatch();
  const { publicKey: pubKey, privateKey: privKey, latestMuted } = useSelector((s: RootState) => s.login);
  const { isMuted } = useModeration();
  const db = useDb();

  const subMetadata = useMemo(() => {
    if (!pubKey) return null;

    let sub = new Subscriptions();
    sub.Id = `login:meta`;
    sub.Authors = new Set([pubKey]);
    sub.Kinds = new Set([EventKind.ContactList, EventKind.SetMetadata]);
    sub.Limit = 2

    return sub;
  }, [pubKey]);

  const subNotification = useMemo(() => {
    if (!pubKey) return null;

    let sub = new Subscriptions();
    sub.Id = "login:notifications";
    // todo: add zaps
    sub.Kinds = new Set([EventKind.TextNote]);
    sub.PTags = new Set([pubKey]);
    sub.Limit = 1;
    return sub;
  }, [pubKey]);

  const subMuted = useMemo(() => {
    if (!pubKey) return null;

    let sub = new Subscriptions();
    sub.Id = "login:muted";
    sub.Kinds = new Set([EventKind.Lists]);
    sub.Authors = new Set([pubKey]);
    sub.DTags = new Set([Lists.Muted]);
    sub.Limit = 1;

    return sub;
  }, [pubKey]);

  const subDms = useMemo(() => {
    if (!pubKey) return null;

    let dms = new Subscriptions();
    dms.Id = "login:dms";
    dms.Kinds = new Set([EventKind.DirectMessage]);
    dms.PTags = new Set([pubKey]);

    let dmsFromME = new Subscriptions();
    dmsFromME.Authors = new Set([pubKey]);
    dmsFromME.Kinds = new Set([EventKind.DirectMessage]);
    dms.AddSubscription(dmsFromME);

    return dms;
  }, [pubKey]);

  const metadataFeed = useSubscription(subMetadata, { leaveOpen: true, cache: true });
  const notificationFeed = useSubscription(subNotification, { leaveOpen: true, cache: true });
  const dmsFeed = useSubscription(subDms, { leaveOpen: true, cache: true });
  const mutedFeed = useSubscription(subMuted, { leaveOpen: true, cache: true });

  useEffect(() => {
    let contactList = metadataFeed.store.notes.filter(a => a.kind === EventKind.ContactList);
    let metadata = metadataFeed.store.notes.filter(a => a.kind === EventKind.SetMetadata);
    let profiles = metadata.map(a => mapEventToProfile(a))
      .filter(a => a !== undefined)
      .map(a => a!);

    for (let cl of contactList) {
      if (cl.content !== "" && cl.content !== "{}") {
        let relays = JSON.parse(cl.content);
        dispatch(setRelays({ relays, createdAt: cl.created_at }));
      }
      let pTags = cl.tags.filter(a => a[0] === "p").map(a => a[1]);
      dispatch(setFollows({ keys: pTags, createdAt: cl.created_at }));
    }

    (async () => {
      let maxProfile = profiles.reduce((acc, v) => {
        if (v.created > acc.created) {
          acc.profile = v;
          acc.created = v.created;
        }
        return acc;
      }, { created: 0, profile: null as MetadataCache | null });
      if (maxProfile.profile) {
        let existing = await db.find(maxProfile.profile.pubkey);
        if ((existing?.created ?? 0) < maxProfile.created) {
          await db.put(maxProfile.profile);
        }
      }
    })().catch(console.warn);
  }, [dispatch, metadataFeed.store, db]);

  useEffect(() => {
    const replies = notificationFeed.store.notes.filter(a => a.kind === EventKind.TextNote && !isMuted(a.pubkey))
    replies.forEach(nx => {
      makeNotification(db, nx).then(notification => {
        if (notification) {
          // @ts-ignore
          dispatch(sendNotification(notification))
        }
      })
    })
  }, [dispatch, notificationFeed.store, db]);

  useEffect(() => {
    const muted = getMutedKeys(mutedFeed.store.notes)
    dispatch(setMuted(muted))

    const newest = getNewest(mutedFeed.store.notes)
    if (newest && newest.content.length > 0 && pubKey && newest.created_at > latestMuted) {
      decryptBlocked(newest, pubKey, privKey).then((plaintext) => {
        try {
          const blocked = JSON.parse(plaintext)
          const keys = blocked.filter((p: any) => p && p.length === 2 && p[0] === "p").map((p: any) => p[1])
          dispatch(setBlocked({
            keys,
            createdAt: newest.created_at,
          }))
        } catch (error) {
          console.debug("Couldn't parse JSON")
        }
      }).catch((error) => console.warn(error))
    }
  }, [dispatch, mutedFeed.store])

  useEffect(() => {
    let dms = dmsFeed.store.notes.filter(a => a.kind === EventKind.DirectMessage);
    dispatch(addDirectMessage(dms));
  }, [dispatch, dmsFeed.store]);
}


async function decryptBlocked(raw: TaggedRawEvent, pubKey: HexKey, privKey?: HexKey) {
  const ev = new Event(raw)
  if (pubKey && privKey) {
    return await ev.DecryptData(raw.content, privKey, pubKey)
  } else {
    return await barierNip07(() => window.nostr.nip04.decrypt(pubKey, raw.content));
  }
}