// @flow
import { sortBy } from "lodash";
import { observer } from "mobx-react";
import { PlusIcon, UserIcon } from "outline-icons";
import * as React from "react";
import { Trans, useTranslation } from "react-i18next";
import { useHistory, useLocation } from "react-router-dom";
import scrollIntoView from "smooth-scroll-into-view-if-needed";
import { PAGINATION_SYMBOL } from "stores/BaseStore";
import Invite from "scenes/Invite";
import { Action } from "components/Actions";
import Button from "components/Button";
import Flex from "components/Flex";
import Heading from "components/Heading";
import HelpText from "components/HelpText";
import InputSearch from "components/InputSearch";
import Modal from "components/Modal";
import Scene from "components/Scene";
import PeopleTable from "./components/PeopleTable";
import UserStatusFilter from "./components/UserStatusFilter";
import useBoolean from "hooks/useBoolean";
import useCurrentTeam from "hooks/useCurrentTeam";
import useQuery from "hooks/useQuery";
import useStores from "hooks/useStores";

function People(props) {
  const topRef = React.useRef();
  const location = useLocation();
  const history = useHistory();
  const [
    inviteModalOpen,
    handleInviteModalOpen,
    handleInviteModalClose,
  ] = useBoolean();
  const team = useCurrentTeam();
  const { users, policies } = useStores();
  const { t } = useTranslation();
  const params = useQuery();
  const [isLoading, setIsLoading] = React.useState(false);
  const [data, setData] = React.useState([]);
  const [totalPages, setTotalPages] = React.useState(0);
  const [userIds, setUserIds] = React.useState([]);
  const can = policies.abilities(team.id);
  const query = params.get("query") || "";
  const filter = params.get("filter") || "";
  const sort = params.get("sort") || "name";
  const direction = (params.get("direction") || "asc").toUpperCase();
  const page = parseInt(params.get("page") || 0, 10);
  const limit = 25;

  React.useEffect(() => {
    const fetchData = async () => {
      setIsLoading(true);

      try {
        const response = await users.fetchPage({
          offset: page * limit,
          limit,
          sort,
          direction,
          query,
          filter,
        });

        setTotalPages(Math.ceil(response[PAGINATION_SYMBOL].total / limit));
        setUserIds(response.map((u) => u.id));
      } finally {
        setIsLoading(false);
      }
    };

    fetchData();
  }, [query, sort, filter, page, direction, users]);

  React.useEffect(() => {
    let filtered = users.orderedData;
    if (!filter) {
      filtered = users.active.filter((u) => userIds.includes(u.id));
    } else if (filter === "all") {
      filtered = users.orderedData.filter((u) => userIds.includes(u.id));
    } else if (filter === "admins") {
      filtered = users.admins.filter((u) => userIds.includes(u.id));
    } else if (filter === "suspended") {
      filtered = users.suspended.filter((u) => userIds.includes(u.id));
    } else if (filter === "invited") {
      filtered = users.invited.filter((u) => userIds.includes(u.id));
    } else if (filter === "viewers") {
      filtered = users.viewers.filter((u) => userIds.includes(u.id));
    }

    // sort the resulting data by the original order from the server
    setData(sortBy(filtered, (item) => userIds.indexOf(item.id)));
  }, [
    filter,
    users.active,
    users.admins,
    users.orderedData,
    users.suspended,
    users.invited,
    users.viewers,
    userIds,
  ]);

  const handleFilter = React.useCallback(
    (filter) => {
      if (filter) {
        params.set("filter", filter);
        params.delete("page");
      } else {
        params.delete("filter");
      }
      history.replace({
        pathname: location.pathname,
        search: params.toString(),
      });
    },
    [params, history, location.pathname]
  );

  const handleSearch = React.useCallback(
    (event) => {
      const { value } = event.target;
      if (value) {
        params.set("query", event.target.value);
        params.delete("page");
      } else {
        params.delete("query");
      }
      history.replace({
        pathname: location.pathname,
        search: params.toString(),
      });
    },
    [params, history, location.pathname]
  );

  const handleChangeSort = React.useCallback(
    (sort, direction) => {
      if (sort) {
        params.set("sort", sort);
      } else {
        params.delete("sort");
      }
      if (direction === "DESC") {
        params.set("direction", direction.toLowerCase());
      } else {
        params.delete("direction");
      }
      history.replace({
        pathname: location.pathname,
        search: params.toString(),
      });
    },
    [params, history, location.pathname]
  );

  const handleChangePage = React.useCallback(
    (page) => {
      if (page) {
        params.set("page", page.toString());
      } else {
        params.delete("page");
      }
      history.replace({
        pathname: location.pathname,
        search: params.toString(),
      });

      if (topRef.current) {
        scrollIntoView(topRef.current, {
          scrollMode: "if-needed",
          behavior: "instant",
          block: "start",
        });
      }
    },
    [params, history, location.pathname]
  );

  return (
    <Scene
      title={t("Members")}
      icon={<UserIcon color="currentColor" />}
      actions={
        <>
          {can.inviteUser && (
            <Action>
              <Button
                type="button"
                data-on="click"
                data-event-category="invite"
                data-event-action="peoplePage"
                onClick={handleInviteModalOpen}
                icon={<PlusIcon />}
              >
                {t("Invite people")}…
              </Button>
            </Action>
          )}
        </>
      }
    >
      <Heading>{t("Members")}</Heading>
      <HelpText>
        <Trans>
          Everyone that has signed into Outline appears here. It’s possible that
          there are other users who have access through {team.signinMethods} but
          haven’t signed in yet.
        </Trans>
      </HelpText>
      <Flex gap={8}>
        <InputSearch
          short
          value={query}
          placeholder={`${t("Filter")}…`}
          onChange={handleSearch}
        />
        <UserStatusFilter activeKey={filter} onSelect={handleFilter} />
      </Flex>
      <PeopleTable
        topRef={topRef}
        data={data}
        canManage={can.manage}
        isLoading={isLoading}
        onChangeSort={handleChangeSort}
        onChangePage={handleChangePage}
        page={page}
        totalPages={totalPages}
        defaultSortDirection="ASC"
      />
      {can.inviteUser && (
        <Modal
          title={t("Invite people")}
          onRequestClose={handleInviteModalClose}
          isOpen={inviteModalOpen}
        >
          <Invite onSubmit={handleInviteModalClose} />
        </Modal>
      )}
    </Scene>
  );
}

export default observer(People);