[#90] added freebusy (#618)

__test__/features/Events/EventModal.test.tsx

@@ -1,3 +1,4 @@
+import * as calendarsApi from "@/features/Calendars/CalendarApi";
 import * as eventThunks from "@/features/Calendars/services";
 import EventPopover from "@/features/Events/EventModal";
 import { api } from "@/utils/apiUtils";
@@ -210,6 +211,9 @@ describe("EventPopover", () => {
   });
   it("adds a attendee", async () => {
     jest.useFakeTimers();
+    jest
+      .spyOn(calendarsApi, "getCalendars")
+      .mockReturnValue({ json: jest.fn() });
     renderPopover();
     fireEvent.change(screen.getByLabelText("event.form.title"), {
       target: { value: "newEvent" },

__test__/features/Events/FreeBusy.test.tsx

@@ -0,0 +1,401 @@
+import {
+  hasFreeBusyConflict,
+  useAttendeesFreeBusy,
+} from "@/components/Attendees/useFreeBusy";
+import * as getFreeBusyREPORT from "@/features/Events/api/getFreeBusyForAddedAttendeesREPORT";
+import * as getFreeBusyPOST from "@/features/Events/api/getFreeBusyForEventAttendeesPOST";
+import * as getUserData from "@/features/Events/api/getUserDataFromEmail";
+import { renderHook, waitFor } from "@testing-library/react";
+
+jest.mock("moment-timezone", () => {
+  const actual = jest.requireActual("moment-timezone");
+  return actual;
+});
+
+jest.mock("@/features/Events/api/getUserDataFromEmail");
+jest.mock("@/features/Events/api/getFreeBusyForAddedAttendeesREPORT");
+jest.mock("@/features/Events/api/getFreeBusyForEventAttendeesPOST");
+
+const mockGetUserData = getUserData.getUserDataFromEmail as jest.MockedFunction<
+  typeof getUserData.getUserDataFromEmail
+>;
+const mockREPORT =
+  getFreeBusyREPORT.getFreeBusyForAddedAttendeesREPORT as jest.MockedFunction<
+    typeof getFreeBusyREPORT.getFreeBusyForAddedAttendeesREPORT
+  >;
+const mockPOST =
+  getFreeBusyPOST.getFreeBusyForEventAttendeesPOST as jest.MockedFunction<
+    typeof getFreeBusyPOST.getFreeBusyForEventAttendeesPOST
+  >;
+
+const START = "2026-03-14T14:00:00";
+const END = "2026-03-14T15:00:00";
+const TZ = "Europe/Paris";
+
+describe("hasFreeBusyConflict", () => {
+  it("returns false for non-vcalendar data", () => {
+    expect(hasFreeBusyConflict({ data: ["not-vcalendar", [], []] })).toBe(
+      false
+    );
+  });
+
+  it("returns false when vfreebusy has no freebusy property", () => {
+    const data = {
+      data: [
+        "vcalendar",
+        [],
+        [
+          [
+            "vfreebusy",
+            [["dtstart", {}, "date-time", "2026-03-14T14:00:00Z"]],
+            [],
+          ],
+        ],
+      ],
+    };
+    expect(hasFreeBusyConflict(data)).toBe(false);
+  });
+
+  it("returns true when vfreebusy contains a freebusy property", () => {
+    const data = {
+      data: [
+        "vcalendar",
+        [],
+        [
+          [
+            "vfreebusy",
+            [
+              ["dtstart", {}, "date-time", "2026-03-14T14:00:00Z"],
+              ["freebusy", {}, "period", "2026-03-14T14:00:00Z/PT1H"],
+            ],
+            [],
+          ],
+        ],
+      ],
+    };
+    expect(hasFreeBusyConflict(data)).toBe(true);
+  });
+
+  it("returns false for malformed data without throwing", () => {
+    expect(hasFreeBusyConflict(null)).toBe(false);
+    expect(hasFreeBusyConflict("garbage")).toBe(false);
+    expect(hasFreeBusyConflict({ data: null })).toBe(false);
+  });
+});
+
+describe("useAttendeesFreeBusy — Flow B (new attendees)", () => {
+  beforeEach(() => jest.clearAllMocks());
+
+  const newAttendee = { email: "alice@example.com", userId: "user-alice" };
+
+  it("shows loading then free for a new attendee", async () => {
+    mockREPORT.mockResolvedValue(false);
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [],
+        newAttendees: [newAttendee],
+        start: START,
+        end: END,
+        timezone: TZ,
+      })
+    );
+
+    expect(result.current[newAttendee.email]).toBe("loading");
+
+    await waitFor(() => expect(result.current[newAttendee.email]).toBe("free"));
+  });
+
+  it("shows busy when REPORT returns true", async () => {
+    mockREPORT.mockResolvedValue(true);
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [],
+        newAttendees: [newAttendee],
+        start: START,
+        end: END,
+        timezone: TZ,
+      })
+    );
+
+    await waitFor(() => expect(result.current[newAttendee.email]).toBe("busy"));
+  });
+
+  it("shows unknown when REPORT throws", async () => {
+    mockREPORT.mockRejectedValue(new Error("network error"));
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [],
+        newAttendees: [newAttendee],
+        start: START,
+        end: END,
+        timezone: TZ,
+      })
+    );
+
+    await waitFor(() =>
+      expect(result.current[newAttendee.email]).toBe("unknown")
+    );
+  });
+
+  it("resolves userId via getUserDataFromEmail when not provided", async () => {
+    mockGetUserData.mockResolvedValue([{ _id: "resolved-id" }] as never);
+    mockREPORT.mockResolvedValue(false);
+
+    const attendeeWithoutId = { email: "bob@example.com" };
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [],
+        newAttendees: [attendeeWithoutId],
+        start: START,
+        end: END,
+        timezone: TZ,
+      })
+    );
+
+    await waitFor(() =>
+      expect(result.current[attendeeWithoutId.email]).toBe("free")
+    );
+    expect(mockGetUserData).toHaveBeenCalledWith("bob@example.com");
+    expect(mockREPORT).toHaveBeenCalledWith(
+      "resolved-id",
+      expect.any(String),
+      expect.any(String)
+    );
+  });
+
+  it("shows unknown when userId cannot be resolved", async () => {
+    mockGetUserData.mockResolvedValue([]);
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [],
+        newAttendees: [{ email: "ghost@example.com" }],
+        start: START,
+        end: END,
+        timezone: TZ,
+      })
+    );
+
+    await waitFor(() =>
+      expect(result.current["ghost@example.com"]).toBe("unknown")
+    );
+    expect(mockREPORT).not.toHaveBeenCalled();
+  });
+
+  it("does not re-fetch an attendee already fetched", async () => {
+    mockREPORT.mockResolvedValue(false);
+
+    const { result, rerender } = renderHook(
+      ({ attendees }) =>
+        useAttendeesFreeBusy({
+          existingAttendees: [],
+          newAttendees: attendees,
+          start: START,
+          end: END,
+          timezone: TZ,
+        }),
+      { initialProps: { attendees: [newAttendee] } }
+    );
+
+    await waitFor(() => expect(result.current[newAttendee.email]).toBe("free"));
+
+    rerender({ attendees: [newAttendee] });
+    expect(mockREPORT).toHaveBeenCalledTimes(1);
+  });
+
+  it("removes departed attendee from the map", async () => {
+    mockREPORT.mockResolvedValue(false);
+
+    const { result, rerender } = renderHook(
+      ({ attendees }) =>
+        useAttendeesFreeBusy({
+          existingAttendees: [],
+          newAttendees: attendees,
+          start: START,
+          end: END,
+          timezone: TZ,
+        }),
+      { initialProps: { attendees: [newAttendee] } }
+    );
+
+    await waitFor(() => expect(result.current[newAttendee.email]).toBe("free"));
+
+    rerender({ attendees: [] });
+
+    await waitFor(() =>
+      expect(result.current[newAttendee.email]).toBeUndefined()
+    );
+  });
+
+  it("invalidates cache and re-fetches when time window changes", async () => {
+    mockREPORT.mockResolvedValue(false);
+
+    const { result, rerender } = renderHook(
+      ({ start, end }) =>
+        useAttendeesFreeBusy({
+          existingAttendees: [],
+          newAttendees: [newAttendee],
+          start,
+          end,
+          timezone: TZ,
+        }),
+      { initialProps: { start: START, end: END } }
+    );
+
+    await waitFor(() => expect(result.current[newAttendee.email]).toBe("free"));
+
+    rerender({ start: "2026-03-15T14:00:00", end: "2026-03-15T15:00:00" });
+
+    await waitFor(() => expect(result.current[newAttendee.email]).toBe("free"));
+
+    expect(mockREPORT).toHaveBeenCalledTimes(2);
+  });
+
+  it("passes UTC-converted iCal times to the API", async () => {
+    mockREPORT.mockResolvedValue(false);
+
+    renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [],
+        newAttendees: [newAttendee],
+        start: "2026-03-14T16:00:00", // 16:00 Paris = 15:00 UTC in winter
+        end: "2026-03-14T17:00:00",
+        timezone: "Europe/Paris",
+      })
+    );
+
+    await waitFor(() => expect(mockREPORT).toHaveBeenCalled());
+
+    // Paris is UTC+1 in March (before DST), so 16:00 → 15:00 UTC
+    expect(mockREPORT).toHaveBeenCalledWith(
+      "user-alice",
+      "20260314T150000",
+      "20260314T160000"
+    );
+  });
+});
+
+describe("useAttendeesFreeBusy — Flow A (existing attendees)", () => {
+  beforeEach(() => jest.clearAllMocks());
+
+  const existingAttendee = { email: "carol@example.com", userId: "user-carol" };
+
+  it("does not fetch when eventUid is missing", () => {
+    renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [existingAttendee],
+        newAttendees: [],
+        start: START,
+        end: END,
+        timezone: TZ,
+      })
+    );
+
+    expect(mockPOST).not.toHaveBeenCalled();
+  });
+
+  it("shows loading then free for existing attendees", async () => {
+    mockPOST.mockResolvedValue({ "user-carol": false });
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [existingAttendee],
+        newAttendees: [],
+        start: START,
+        end: END,
+        timezone: TZ,
+        eventUid: "event-123",
+      })
+    );
+
+    expect(result.current[existingAttendee.email]).toBe("loading");
+
+    await waitFor(() =>
+      expect(result.current[existingAttendee.email]).toBe("free")
+    );
+  });
+
+  it("shows busy when POST returns busy for userId", async () => {
+    mockPOST.mockResolvedValue({ "user-carol": true });
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [existingAttendee],
+        newAttendees: [],
+        start: START,
+        end: END,
+        timezone: TZ,
+        eventUid: "event-123",
+      })
+    );
+
+    await waitFor(() =>
+      expect(result.current[existingAttendee.email]).toBe("busy")
+    );
+  });
+
+  it("shows unknown when POST throws", async () => {
+    mockPOST.mockRejectedValue(new Error("server error"));
+
+    const { result } = renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [existingAttendee],
+        newAttendees: [],
+        start: START,
+        end: END,
+        timezone: TZ,
+        eventUid: "event-123",
+      })
+    );
+
+    await waitFor(() =>
+      expect(result.current[existingAttendee.email]).toBe("unknown")
+    );
+  });
+
+  it("passes the eventUid to the POST API", async () => {
+    mockPOST.mockResolvedValue({ "user-carol": false });
+
+    renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [existingAttendee],
+        newAttendees: [],
+        start: START,
+        end: END,
+        timezone: TZ,
+        eventUid: "event-abc",
+      })
+    );
+
+    await waitFor(() => expect(mockPOST).toHaveBeenCalled());
+    expect(mockPOST).toHaveBeenCalledWith(
+      ["user-carol"],
+      expect.any(String),
+      expect.any(String),
+      "event-abc"
+    );
+  });
+});
+
+describe("useAttendeesFreeBusy — enabled flag", () => {
+  it("does not fetch when disabled", () => {
+    renderHook(() =>
+      useAttendeesFreeBusy({
+        existingAttendees: [{ email: "x@x.com", userId: "uid" }],
+        newAttendees: [{ email: "y@y.com", userId: "uid2" }],
+        start: START,
+        end: END,
+        timezone: TZ,
+        eventUid: "event-123",
+        enabled: false,
+      })
+    );
+
+    expect(mockPOST).not.toHaveBeenCalled();
+    expect(mockREPORT).not.toHaveBeenCalled();
+  });
+});

src/components/Attendees/AttendeeSearch.tsx

@@ -1,18 +1,33 @@
 import { userAttendee } from "@/features/User/models/attendee";
 import { createAttendee } from "@/features/User/models/attendee.mapper";
-import { useEffect, useState } from "react";
+import { useRef, useState } from "react";
+import { FreeBusyIndicator } from "./FreeBusyIndicator";
 import {
   ExtendedAutocompleteRenderInputParams,
   PeopleSearch,
   User,
 } from "./PeopleSearch";
+import { FreeBusyMap, useAttendeesFreeBusy } from "./useFreeBusy";
 
-export default function UserSearch({
+const attendeeToUser = (a: userAttendee, openpaasId = ""): User => ({
+  email: a.cal_address,
+  displayName: a.cn ?? "",
+  avatarUrl: "",
+  openpaasId,
+});
+
+const hasCalendar = (u: User) => u.objectType === "user" && !!u.openpaasId;
+
+export default function AttendeeSearch({
   attendees,
   setAttendees,
   disabled,
   inputSlot,
   placeholder,
+  start,
+  end,
+  timezone,
+  eventUid,
 }: {
   attendees: userAttendee[];
   setAttendees: (attendees: userAttendee[]) => void;
@@ -21,25 +36,59 @@ export default function UserSearch({
     params: ExtendedAutocompleteRenderInputParams
   ) => React.ReactNode;
   placeholder?: string;
+  start?: string;
+  end?: string;
+  timezone?: string;
+  eventUid?: string | null;
 }) {
-  const [selectedUsers, setSelectedUsers] = useState<User[]>(
-    attendees.map((attendee) => ({
-      email: attendee.cal_address,
-      displayName: attendee.cn ?? "",
-      avatarUrl: "",
-      openpaasId: "",
-    })) ?? []
+  const [userIdMap, setUserIdMap] = useState<Record<string, string>>({});
+  const [addedUsers, setAddedUsers] = useState<User[]>([]);
+  const initialEmailsRef = useRef<Set<string> | null>(null);
+  if (initialEmailsRef.current === null && !!eventUid && attendees.length > 0) {
+    initialEmailsRef.current = new Set(attendees.map((a) => a.cal_address));
+  }
+  const initialEmails = eventUid
+    ? (initialEmailsRef.current ?? new Set<string>())
+    : new Set<string>();
+
+  const selectedUsers: User[] = [
+    ...addedUsers,
+    ...attendees
+      .map((a) => attendeeToUser(a, userIdMap[a.cal_address]))
+      .filter((a) => !addedUsers.find((u) => a.email === u.email)),
+  ];
+
+  const toAttendee = (u: User) => ({
+    email: u.email,
+    userId: u.openpaasId || userIdMap[u.email] || null,
+  });
+
+  const existingAttendees = selectedUsers
+    .filter((u) => initialEmails.has(u.email))
+    .map(toAttendee);
+  const newAttendees = selectedUsers
+    .filter((u) => !initialEmails.has(u.email) && hasCalendar(u))
+    .map(toAttendee);
+
+  // Contacts and freeSolo users get a static "contact" status — no API call needed
+  const contactMap: FreeBusyMap = Object.fromEntries(
+    selectedUsers
+      .filter((u) => !initialEmails.has(u.email) && !hasCalendar(u))
+      .map((u) => [u.email, "contact" as const])
   );
-  useEffect(() => {
-    setSelectedUsers(
-      attendees.map((attendee) => ({
-        email: attendee.cal_address,
-        displayName: attendee.cn ?? "",
-        avatarUrl: "",
-        openpaasId: "",
-      }))
-    );
-  }, [attendees]);
+
+  const freeBusyMap = useAttendeesFreeBusy({
+    existingAttendees,
+    newAttendees,
+    start: start ?? "",
+    end: end ?? "",
+    timezone: timezone ?? "",
+    eventUid,
+    enabled: !!(start && end && selectedUsers.length > 0),
+  });
+
+  const statusMap = { ...freeBusyMap, ...contactMap };
+
   return (
     <PeopleSearch
       selectedUsers={selectedUsers}
@@ -47,16 +96,27 @@ export default function UserSearch({
       disabled={disabled}
       inputSlot={inputSlot}
       placeholder={placeholder}
+      getChipIcon={
+        start && end
+          ? (user) => (
+              <FreeBusyIndicator status={statusMap[user.email] ?? "unknown"} />
+            )
+          : undefined
+      }
       onChange={(_event, value: User[]) => {
+        setUserIdMap((prev) => {
+          const next = { ...prev };
+          for (const u of value) {
+            if (u.openpaasId && u.email) next[u.email] = u.openpaasId;
+          }
+          return next;
+        });
+        setAddedUsers(value.filter((u) => !initialEmails.has(u.email)));
         setAttendees(
-          value.map((attendee: User) =>
-            createAttendee({
-              cal_address: attendee.email,
-              cn: attendee.displayName,
-            })
+          value.map((u) =>
+            createAttendee({ cal_address: u.email, cn: u.displayName })
           )
         );
-        setSelectedUsers(value);
       }}
       freeSolo
     />

src/components/Attendees/FreeBusyIndicator.tsx

@@ -0,0 +1,50 @@
+import { Tooltip } from "@linagora/twake-mui";
+import AccessTimeFilledIcon from "@mui/icons-material/AccessTimeFilled";
+import CloseIcon from "@mui/icons-material/Close";
+import { useEffect, useState } from "react";
+import { useI18n } from "twake-i18n";
+import { FreeBusyStatus } from "./useFreeBusy";
+
+interface FreeBusyIndicatorProps {
+  status: FreeBusyStatus;
+  size?: number;
+}
+
+export function FreeBusyIndicator({ status }: FreeBusyIndicatorProps) {
+  const { t } = useI18n();
+  const [open, setOpen] = useState(false);
+  useEffect(() => {
+    if (status === "busy") setOpen(true);
+  }, [status]);
+
+  if (status !== "busy") return null;
+
+  return (
+    <Tooltip
+      title={
+        <span style={{ display: "flex", alignItems: "center", gap: 4 }}>
+          {t("event.freeBusy.busy")}
+          <CloseIcon
+            fontSize="inherit"
+            style={{ cursor: "pointer" }}
+            onClick={() => setOpen(false)}
+          />
+        </span>
+      }
+      open={open}
+      disableHoverListener
+      placement="bottom-start"
+      onClose={() => setOpen(false)}
+      slotProps={{ tooltip: { sx: { opacity: 1, bgcolor: "grey.900" } } }}
+    >
+      <AccessTimeFilledIcon
+        aria-label={t("event.freeBusy.busy")}
+        color="warning"
+        style={{
+          margin: "0 -6px 0 5px",
+          flexShrink: 0,
+        }}
+      />
+    </Tooltip>
+  );
+}

src/components/Attendees/PeopleSearch.tsx

@@ -1,6 +1,8 @@
 import { getAccessiblePair } from "@/components/Calendar/utils/calendarColorsUtils";
 import { stringAvatar } from "@/components/Event/utils/eventUtils";
 import { SnackbarAlert } from "@/components/Loading/SnackBarAlert";
+import CloseIcon from "@mui/icons-material/Close";
+
 import { searchUsers } from "@/features/User/userAPI";
 import {
   Autocomplete,
@@ -33,6 +35,7 @@ export interface User {
   avatarUrl?: string;
   openpaasId?: string;
   color?: Record<string, string>;
+  objectType?: string;
 }
 
 export interface ExtendedAutocompleteRenderInputParams extends AutocompleteRenderInputParams {
@@ -54,6 +57,7 @@ export function PeopleSearch({
   inputSlot,
   customRenderInput,
   customSlotProps,
+  getChipIcon,
 }: {
   selectedUsers: User[];
   onChange: (event: SyntheticEvent, users: User[]) => void;
@@ -75,6 +79,7 @@ export function PeopleSearch({
     paper?: Partial<PaperProps>;
     listbox?: Partial<HTMLAttributes<HTMLUListElement>>;
   };
+  getChipIcon?: (user: User) => ReactNode;
 }) {
   const { t } = useI18n();
   const [query, setQuery] = useState("");
@@ -307,7 +312,6 @@ export function PeopleSearch({
             ...customSlotProps?.popper,
           },
         }}
-        // When render input is custom, the adornments should be handled by the custom component
         forcePopupIcon={false}
         disableClearable
         renderInput={(params) =>
@@ -341,14 +345,18 @@ export function PeopleSearch({
               ? option
               : option.displayName || option.email;
             const chipColor = isString
-              ? theme.palette.grey[300]
-              : (option.color?.light ?? theme.palette.grey[300]);
+              ? theme.palette.grey[200]
+              : (option.color?.light ?? theme.palette.grey[200]);
             const textColor = getAccessiblePair(chipColor, theme);
 
             return (
               <Chip
                 {...getTagProps({ index })}
                 key={label}
+                icon={
+                  !isString && getChipIcon ? getChipIcon(option) : undefined
+                }
+                deleteIcon={<CloseIcon />}
                 style={{
                   backgroundColor: chipColor,
                   color: textColor,

src/components/Attendees/useFreeBusy.ts

@@ -0,0 +1,251 @@
+import { getFreeBusyForAddedAttendeesREPORT } from "@/features/Events/api/getFreeBusyForAddedAttendeesREPORT";
+import { getFreeBusyForEventAttendeesPOST } from "@/features/Events/api/getFreeBusyForEventAttendeesPOST";
+import { getUserDataFromEmail } from "@/features/Events/api/getUserDataFromEmail";
+import moment from "moment-timezone";
+import { useEffect, useRef, useState } from "react";
+
+export type FreeBusyStatus =
+  | "free"
+  | "busy"
+  | "loading"
+  | "contact"
+  | "unknown";
+export type FreeBusyMap = Record<string, FreeBusyStatus>;
+
+interface Attendee {
+  email: string;
+  userId?: string | null;
+}
+
+interface ResolvedAttendee {
+  email: string;
+  userId: string;
+}
+
+// Helpers
+async function resolveUserId(attendee: Attendee): Promise<string | null> {
+  if (attendee.userId) return attendee.userId;
+  return getUserDataFromEmail(attendee.email)
+    .then((u) => u[0]?._id ?? null)
+    .catch(() => null);
+}
+
+async function resolveAll(attendees: Attendee[]): Promise<ResolvedAttendee[]> {
+  const results = await Promise.all(
+    attendees.map(async (a) => {
+      const userId = await resolveUserId(a);
+      return userId ? { email: a.email, userId } : null;
+    })
+  );
+  return results.filter((r): r is ResolvedAttendee => r !== null);
+}
+
+export function hasFreeBusyConflict(data: unknown): boolean {
+  try {
+    const jcal = (data as { data: unknown[] }).data;
+    if (!Array.isArray(jcal) || jcal[0] !== "vcalendar") return false;
+    const components = jcal[2] as unknown[][];
+    return (
+      Array.isArray(components) && components.some(isVFreeBusyWithConflict)
+    );
+  } catch {
+    return false;
+  }
+}
+
+function isVFreeBusyWithConflict(component: unknown): boolean {
+  if (!Array.isArray(component) || component[0] !== "vfreebusy") return false;
+  const props = component[1] as unknown[][];
+  return (
+    Array.isArray(props) &&
+    props.some((p) => Array.isArray(p) && p[0] === "freebusy")
+  );
+}
+
+function toUtcIcal(datetime: string, timezone: string): string {
+  return moment.tz(datetime, timezone).utc().format("YYYYMMDDTHHmmss");
+}
+
+async function fetchFreeBusyMap(
+  attendees: Attendee[],
+  fetcher: (resolved: ResolvedAttendee[]) => Promise<FreeBusyMap>
+): Promise<FreeBusyMap> {
+  const resolved = await resolveAll(attendees);
+
+  const unresolved: FreeBusyMap = Object.fromEntries(
+    attendees
+      .filter((a) => !resolved.find((r) => r.email === a.email))
+      .map((a) => [a.email, "unknown" as FreeBusyStatus])
+  );
+
+  if (resolved.length === 0) return unresolved;
+
+  const fetched = await fetcher(resolved);
+  return { ...unresolved, ...fetched };
+}
+
+function toLoadingMap(attendees: Attendee[]): FreeBusyMap {
+  return Object.fromEntries(
+    attendees.map((a) => [a.email, "loading" as FreeBusyStatus])
+  );
+}
+
+function toUnknownMap(attendees: Attendee[]): FreeBusyMap {
+  return Object.fromEntries(
+    attendees.map((a) => [a.email, "unknown" as FreeBusyStatus])
+  );
+}
+
+function toFreeBusyMap(
+  resolved: ResolvedAttendee[]
+): (busyByUserId: Record<string, boolean>) => FreeBusyMap {
+  const userIdToEmail = Object.fromEntries(
+    resolved.map(({ email, userId }) => [userId, email])
+  );
+  return (busyByUserId) =>
+    Object.fromEntries(
+      Object.entries(busyByUserId).flatMap(([uid, busy]) => {
+        const email = userIdToEmail[uid];
+        return email
+          ? [[email, (busy ? "busy" : "free") as FreeBusyStatus]]
+          : [];
+      })
+    );
+}
+
+interface UseAttendeesFreeBusyOptions {
+  existingAttendees: Attendee[];
+  newAttendees: Attendee[];
+  start: string;
+  end: string;
+  timezone: string;
+  eventUid?: string | null;
+  enabled?: boolean;
+}
+
+export function useAttendeesFreeBusy({
+  existingAttendees,
+  newAttendees,
+  start,
+  end,
+  timezone,
+  eventUid,
+  enabled = true,
+}: UseAttendeesFreeBusyOptions): FreeBusyMap {
+  const [statusMap, setStatusMap] = useState<FreeBusyMap>({});
+  const fetchedNewEmailsRef = useRef<Set<string>>(new Set());
+
+  const existingKey = existingAttendees.map((a) => a.email).join(",");
+  const newKey = newAttendees.map((a) => a.email).join(",");
+
+  useEffect(() => {
+    fetchedNewEmailsRef.current = new Set();
+    setStatusMap({});
+  }, [start, end, timezone]);
+
+  useEffect(() => {
+    if (
+      !enabled ||
+      !start ||
+      !end ||
+      !eventUid ||
+      existingAttendees.length === 0
+    )
+      return;
+
+    let cancelled = false;
+    setStatusMap((prev) => ({ ...prev, ...toLoadingMap(existingAttendees) }));
+
+    fetchFreeBusyMap(existingAttendees, (resolved) =>
+      getFreeBusyForEventAttendeesPOST(
+        resolved.map((r) => r.userId),
+        toUtcIcal(start, timezone),
+        toUtcIcal(end, timezone),
+        eventUid!
+      ).then(toFreeBusyMap(resolved))
+    )
+      .then((updates) => {
+        if (!cancelled) setStatusMap((prev) => ({ ...prev, ...updates }));
+      })
+      .catch(() => {
+        if (!cancelled)
+          setStatusMap((prev) => ({
+            ...prev,
+            ...toUnknownMap(existingAttendees),
+          }));
+      });
+
+    return () => {
+      cancelled = true;
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [existingKey, start, end, eventUid, enabled, timezone]);
+
+  useEffect(() => {
+    if (!enabled || !start || !end) return;
+
+    const currentEmails = new Set(newAttendees.map((a) => a.email));
+    const removedEmails = [...fetchedNewEmailsRef.current].filter(
+      (e) => !currentEmails.has(e)
+    );
+    if (removedEmails.length > 0) {
+      removedEmails.forEach((e) => {
+        fetchedNewEmailsRef.current.delete(e);
+      });
+      setStatusMap((prev) => {
+        const next = { ...prev };
+        removedEmails.forEach((e) => {
+          delete next[e];
+        });
+        return next;
+      });
+    }
+
+    const toFetch = newAttendees.filter(
+      (a) => !fetchedNewEmailsRef.current.has(a.email)
+    );
+    if (toFetch.length === 0) return;
+
+    let cancelled = false;
+    setStatusMap((prev) => ({ ...prev, ...toLoadingMap(toFetch) }));
+    fetchFreeBusyMap(toFetch, (resolved) =>
+      Promise.all(
+        resolved.map(async ({ email, userId }) => {
+          try {
+            const busy = await getFreeBusyForAddedAttendeesREPORT(
+              userId,
+              moment.tz(start, timezone).utc().format("YYYYMMDDTHHmmss"),
+              moment.tz(end, timezone).utc().format("YYYYMMDDTHHmmss")
+            );
+            return [email, (busy ? "busy" : "free") as FreeBusyStatus] as const;
+          } catch {
+            return [email, "unknown" as FreeBusyStatus] as const;
+          }
+        })
+      ).then(Object.fromEntries)
+    )
+      .then((updates) => {
+        if (!cancelled) {
+          Object.keys(updates).forEach((e) => {
+            fetchedNewEmailsRef.current.add(e);
+          });
+          setStatusMap((prev) => ({ ...prev, ...updates }));
+        }
+      })
+      .catch(() => {
+        if (!cancelled) {
+          toFetch.forEach((a) => {
+            fetchedNewEmailsRef.current.add(a.email);
+          });
+          setStatusMap((prev) => ({ ...prev, ...toUnknownMap(toFetch) }));
+        }
+      });
+
+    return () => {
+      cancelled = true;
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [newKey, start, end, enabled, timezone]);
+
+  return statusMap;
+}

src/components/Event/EventFormFields.tsx

@@ -100,6 +100,7 @@ interface EventFormFieldsProps {
     browserTz: string;
     getTimezoneOffset: (tzName: string, date: Date) => string;
   };
+  eventId?: string | null;
 
   // Event handlers
   onStartChange?: (newStart: string) => void;
@@ -157,6 +158,7 @@ export default function EventFormFields({
   isOpen = false,
   userPersonalCalendars,
   timezoneList,
+  eventId,
   onStartChange,
   onEndChange,
   onAllDayChange,
@@ -633,6 +635,10 @@ export default function EventFormFields({
         <AttendeeSelector
           attendees={attendees}
           setAttendees={setAttendees}
+          start={start}
+          eventUid={eventId}
+          timezone={timezone}
+          end={end}
           placeholder={t("event.form.addGuestsPlaceholder")}
           inputSlot={(params) => <TextField {...params} size="small" />}
         />

src/features/Events/EventUpdateModal.tsx

@@ -1092,6 +1092,7 @@ function EventUpdateModal({
         setEventClass={setEventClass}
         timezone={timezone}
         setTimezone={setTimezone}
+        eventId={event.uid}
         calendarid={calendarid}
         setCalendarid={setCalendarid}
         hasVideoConference={hasVideoConference}

src/features/Events/api/getFreeBusyForAddedAttendeesREPORT.ts

@@ -0,0 +1,37 @@
+import { getCalendars } from "@/features/Calendars/CalendarApi";
+
+import { api } from "@/utils/apiUtils";
+import { extractCalendarHrefs } from "@/utils/extractCalendarHrefs";
+import { hasFreeBusyConflict } from "../../../components/Attendees/useFreeBusy";
+
+export async function getFreeBusyForAddedAttendeesREPORT(
+  userId: string,
+  start: string,
+  end: string
+): Promise<boolean> {
+  const calendars = await getCalendars(
+    userId,
+    "withFreeBusy=true&withRights=true"
+  );
+  const hrefs = extractCalendarHrefs(calendars);
+  if (hrefs.length === 0) return false;
+
+  const freeBusyBody = JSON.stringify({
+    type: "free-busy-query",
+    match: { start, end },
+  });
+
+  const results = await Promise.all(
+    hrefs.map((href) =>
+      api(`dav${href}`, {
+        method: "REPORT",
+        headers: { Accept: "application/json, text/plain, */*" },
+        body: freeBusyBody,
+      })
+        .then((r) => (r.ok ? r.json() : null))
+        .then((data) => (data ? hasFreeBusyConflict(data) : false))
+        .catch(() => false)
+    )
+  );
+  return results.some(Boolean);
+}

src/features/Events/api/getFreeBusyForEventAttendeesPOST.ts

@@ -0,0 +1,22 @@
+import { api } from "@/utils/apiUtils";
+
+export async function getFreeBusyForEventAttendeesPOST(
+  userIds: string[],
+  start: string,
+  end: string,
+  eventUid: string
+): Promise<Record<string, boolean>> {
+  const r = await api("dav/calendars/freebusy", {
+    method: "POST",
+    headers: { Accept: "application/json, text/plain, */*" },
+    body: JSON.stringify({ start, end, users: userIds, uids: [eventUid] }),
+  });
+  if (!r.ok) throw new Error(`HTTP ${r.status}`);
+
+  const { users } = (await r.json()) as {
+    users: { id: string; calendars: { busy: unknown[] }[] }[];
+  };
+  return Object.fromEntries(
+    users.map((u) => [u.id, u.calendars.some((cal) => cal.busy.length > 0)])
+  );
+}

src/features/Events/api/getUserDataFromEmail.ts

@@ -0,0 +1,7 @@
+import { api } from "@/utils/apiUtils";
+
+export async function getUserDataFromEmail(email: string) {
+  const r = await api(`api/users?email=${encodeURIComponent(email)}`);
+  const result: Array<Record<string, string>> = await r.json();
+  return result;
+}

src/features/User/userAPI.ts

@@ -29,9 +29,10 @@ export async function searchUsers(
   return response.map((user) => ({
     email: user.emailAddresses?.[0]?.value || "",
     displayName:
-      user.names?.[0]?.displayName || user.emailAddresses?.[0]?.value,
+      user.names?.[0]?.displayName || user.emailAddresses?.[0]?.value || "",
     avatarUrl: user.photos?.[0]?.url || "",
     openpaasId: user.id || "",
+    objectType: user.objectType,
   }));
 }
 

src/features/User/userDataTypes.ts

@@ -33,6 +33,7 @@ export interface SearchResponseItem {
   emailAddresses?: Array<{ value?: string }>;
   names?: Array<{ displayName?: string }>;
   photos?: Array<{ url?: string }>;
+  objectType?: string;
 }
 
 // Type for configuration item

src/locales/en.json

@@ -130,6 +130,12 @@
         "occurrences": "occurrences"
       }
     },
+    "freeBusy": {
+      "unknown": "Unknown status",
+      "busy": "This person is busy",
+      "free": "User is free",
+      "loading": "Status is loading"
+    },
     "form": {
       "title": "Title",
       "titlePlaceholder": "Add title",

src/locales/fr.json

@@ -131,6 +131,12 @@
         "occurrences": "occurrences"
       }
     },
+    "freeBusy": {
+      "unknown": "Statut inconnu",
+      "busy": "Cette personne est occupée",
+      "free": "L'utilisateur est disponible",
+      "loading": "Chargement du statut"
+    },
     "form": {
       "title": "Titre",
       "titlePlaceholder": "Ajouter un titre",

src/locales/ru.json

@@ -131,6 +131,12 @@
         "occurrences": "повторений"
       }
     },
+    "freeBusy": {
+      "unknown": "Статус неизвестен",
+      "busy": "Пользователь занят",
+      "free": "Пользователь свободен",
+      "loading": "Загрузка статуса"
+    },
     "form": {
       "title": "Название",
       "titlePlaceholder": "Добавить название",

src/locales/vi.json

@@ -129,6 +129,12 @@
         "occurrences": "lần"
       }
     },
+    "freeBusy": {
+      "unknown": "Trạng thái không rõ",
+      "busy": "Người này đang bận",
+      "free": "Người dùng đang rảnh",
+      "loading": "Đang tải trạng thái"
+    },
     "form": {
       "title": "Tiêu đề",
       "titlePlaceholder": "Thêm tiêu đề",

src/utils/extractCalendarHrefs.ts

@@ -0,0 +1,15 @@
+export function extractCalendarHrefs(data: unknown): string[] {
+  try {
+    const calendars = (
+      data as {
+        _embedded: { "dav:calendar": { _links: { self: { href: string } } }[] };
+      }
+    )._embedded["dav:calendar"];
+
+    return Array.isArray(calendars)
+      ? calendars.map((cal) => cal?._links?.self?.href ?? "").filter(Boolean)
+      : [];
+  } catch {
+    return [];
+  }
+}