import React, { useState } from "react";
import { Link } from "react-router-dom";
import { useTranslation } from "react-i18next";
import moment from "moment";
import { DropdownItem, PageSection } from "@patternfly/react-core";
import { CubesIcon } from "@patternfly/react-icons";

import type UserSessionRepresentation from "@keycloak/keycloak-admin-client/lib/defs/userSessionRepresentation";
import type ClientRepresentation from "@keycloak/keycloak-admin-client/lib/defs/clientRepresentation";
import { ListEmptyState } from "../components/list-empty-state/ListEmptyState";
import { ViewHeader } from "../components/view-header/ViewHeader";
import { KeycloakDataTable } from "../components/table-toolbar/KeycloakDataTable";
import { useAdminClient } from "../context/auth/AdminClient";
import { RevocationModal } from "./RevocationModal";
import { LogoutAllSessionsModal } from "./LogoutAllSessionsModal";
import helpUrls from "../help-urls";
import { toClient } from "../clients/routes/Client";
import { useRealm } from "../context/realm-context/RealmContext";

import "./SessionsSection.css";

export default function SessionsSection() {
  const { t } = useTranslation("sessions");
  const adminClient = useAdminClient();
  const { realm } = useRealm();
  const [revocationModalOpen, setRevocationModalOpen] = useState(false);
  const [logoutAllSessionsModalOpen, setLogoutAllSessionsModalOpen] =
    useState(false);
  const [activeClientDetails, setActiveClientDetails] = useState<
    ClientRepresentation[]
  >([]);
  const [noSessions, setNoSessions] = useState(false);

  const handleRevocationModalToggle = () => {
    setRevocationModalOpen(!revocationModalOpen);
  };

  const handleLogoutAllSessionsModalToggle = () => {
    setLogoutAllSessionsModalOpen(!logoutAllSessionsModalOpen);
  };

  const loader = async () => {
    const activeClients = await adminClient.sessions.find();
    const clientSessions = (
      await Promise.all(
        activeClients.map((client) =>
          adminClient.clients.listSessions({ id: client.id })
        )
      )
    ).flat();

    setNoSessions(clientSessions.length === 0);

    const allClients = await adminClient.clients.find();

    const getActiveClientDetails = allClients.filter((x) =>
      activeClients.map((y) => y.id).includes(x.id)
    );

    setActiveClientDetails(getActiveClientDetails);

    const userIds = Array.from(
      new Set(clientSessions.map((session) => session.userId))
    );
    const userSessions = (
      await Promise.all(
        userIds.map((userId) => adminClient.users.listSessions({ id: userId! }))
      )
    ).flat();

    return userSessions;
  };

  const Clients = (row: UserSessionRepresentation) => (
    <>
      {Object.entries(row.clients!).map(([clientId, client]) => (
        <Link
          key={client}
          to={toClient({ clientId, realm, tab: "settings" })}
          className="pf-u-mx-sm"
        >
          {client}
        </Link>
      ))}
    </>
  );

  const dropdownItems = [
    <DropdownItem
      key="toggle-modal"
      data-testid="revocation"
      component="button"
      onClick={() => handleRevocationModalToggle()}
    >
      {t("revocation")}
    </DropdownItem>,
    <DropdownItem
      key="delete-role"
      data-testid="logout-all"
      component="button"
      isDisabled={noSessions}
      onClick={() => handleLogoutAllSessionsModalToggle()}
    >
      {t("signOutAllActiveSessions")}
    </DropdownItem>,
  ];

  return (
    <>
      <ViewHeader
        dropdownItems={dropdownItems}
        titleKey="sessions:title"
        subKey="sessions:sessionExplain"
        helpUrl={helpUrls.sessionsUrl}
      />
      <PageSection variant="light" className="pf-u-p-0">
        {revocationModalOpen && (
          <RevocationModal
            handleModalToggle={handleRevocationModalToggle}
            activeClients={activeClientDetails}
            save={() => {
              handleRevocationModalToggle();
            }}
          />
        )}
        {logoutAllSessionsModalOpen && (
          <LogoutAllSessionsModal
            handleModalToggle={handleLogoutAllSessionsModalToggle}
          />
        )}
        <KeycloakDataTable
          loader={loader}
          ariaLabelKey="session:title"
          searchPlaceholderKey="sessions:searchForSession"
          columns={[
            {
              name: "username",
              displayKey: "sessions:subject",
            },
            {
              name: "lastAccess",
              displayKey: "sessions:lastAccess",
              cellRenderer: (row) => moment(row.lastAccess).fromNow(),
            },
            {
              name: "start",
              displayKey: "sessions:startDate",
              cellRenderer: (row) => moment(row.lastAccess).format("LLL"),
            },
            {
              name: "clients",
              displayKey: "sessions:accessedClients",
              cellRenderer: Clients,
            },
          ]}
          emptyState={
            <ListEmptyState
              hasIcon
              icon={CubesIcon}
              message={t("noSessions")}
              instructions={t("noSessionsDescription")}
            />
          }
        />
      </PageSection>
    </>
  );
}