import { List as ImmutableList, Map as ImmutableMap, OrderedSet as ImmutableOrderedSet } from "immutable";
import { createSelector } from "reselect";

import { me } from "flavours/glitch/initial_state";
import { toServerSideType } from "flavours/glitch/utils/filters";

const getAccountBase         = (state, id) => state.getIn(["accounts", id], null);
const getAccountCounters     = (state, id) => state.getIn(["accounts_counters", id], null);
const getAccountRelationship = (state, id) => state.getIn(["relationships", id], null);
const getAccountMoved        = (state, id) => state.getIn(["accounts", state.getIn(["accounts", id, "moved"])]);

export const makeGetAccount = () => {
  return createSelector([getAccountBase, getAccountCounters, getAccountRelationship, getAccountMoved], (base, counters, relationship, moved) => {
    if (base === null) {
      return null;
    }

    return base.merge(counters).withMutations(map => {
      map.set("relationship", relationship);
      map.set("moved", moved);
    });
  });
};

const getFilters = (state, { contextType }) => {
  if (!contextType) {
    return null;
  }

  const serverSideType = toServerSideType(contextType);
  const now = new Date();

  return state.get("filters").filter((filter) => filter.get("context").includes(serverSideType) && (filter.get("expires_at") === null || filter.get("expires_at") > now));
};

export const makeGetStatus = () => {
  return createSelector(
    [
      (state, { id }) => state.getIn(["statuses", id]),
      (state, { id }) => state.getIn(["statuses", state.getIn(["statuses", id, "reblog"])]),
      (state, { id }) => state.getIn(["accounts", state.getIn(["statuses", id, "account"])]),
      (state, { id }) => state.getIn(["accounts", state.getIn(["statuses", state.getIn(["statuses", id, "reblog"]), "account"])]),
      getFilters,
    ],

    (statusBase, statusReblog, accountBase, accountReblog, filters) => {
      if (!statusBase || statusBase.get("isLoading")) {
        return null;
      }

      let filtered = false;
      if ((accountReblog || accountBase).get("id") !== me && filters) {
        let filterResults = statusReblog?.get("filtered") || statusBase.get("filtered") || ImmutableList();
        if (filterResults.some((result) => filters.getIn([result.get("filter"), "filter_action"]) === "hide")) {
          return null;
        }
        filterResults = filterResults.filter(result => filters.has(result.get("filter")));
        if (!filterResults.isEmpty()) {
          filtered = filterResults.map(result => filters.getIn([result.get("filter"), "title"]));
        }
      }

      if (statusReblog) {
        statusReblog = statusReblog.set("account", accountReblog);
        statusReblog = statusReblog.set("matched_filters", filtered);
      } else {
        statusReblog = null;
      }

      return statusBase.withMutations(map => {
        map.set("reblog", statusReblog);
        map.set("account", accountBase);
        map.set("matched_filters", filtered);
      });
    },
  );
};

export const makeGetPictureInPicture = () => {
  return createSelector([
    (state, { id }) => state.get("picture_in_picture").statusId === id,
    (state) => state.getIn(["meta", "layout"]) !== "mobile",
  ], (inUse, available) => ImmutableMap({
    inUse: inUse && available,
    available,
  }));
};

const ALERT_DEFAULTS = {
  dismissAfter: 5000,
  style: false,
};

export const getAlerts = createSelector(state => state.get("alerts"), alerts =>
  alerts.map(item => ({
    ...ALERT_DEFAULTS,
    ...item,
  })).toArray());

export const makeGetNotification = () => createSelector([
  (_, base)             => base,
  (state, _, accountId) => state.getIn(["accounts", accountId]),
], (base, account) => base.set("account", account));

export const makeGetReport = () => createSelector([
  (_, base) => base,
  (state, _, targetAccountId) => state.getIn(["accounts", targetAccountId]),
], (base, targetAccount) => base.set("target_account", targetAccount));

export const getAccountGallery = createSelector([
  (state, id) => state.getIn(["timelines", `account:${id}:media`, "items"], ImmutableList()),
  state       => state.get("statuses"),
  (state, id) => state.getIn(["accounts", id]),
], (statusIds, statuses, account) => {
  let medias = ImmutableList();

  statusIds.forEach(statusId => {
    const status = statuses.get(statusId);
    medias = medias.concat(status.get("media_attachments").map(media => media.set("status", status).set("account", account)));
  });

  return medias;
});

export const getAccountHidden = createSelector([
  (state, id) => state.getIn(["accounts", id, "hidden"]),
  (state, id) => state.getIn(["relationships", id, "following"]) || state.getIn(["relationships", id, "requested"]),
  (state, id) => id === me,
], (hidden, followingOrRequested, isSelf) => {
  return hidden && !(isSelf || followingOrRequested);
});

export const getStatusList = createSelector([
  (state, type) => state.getIn(["status_lists", type, "items"], ImmutableOrderedSet()),
], (items) => items.toList());