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import dayjs, { Dayjs } from "dayjs";
import { getTimeNow } from "server/features/assignment/utils/getTimeNow";
import { findUserDirectSignups } from "server/features/direct-signup/directSignupRepository";
import {
checkGroupExists,
findGroupMembers,
saveGroupCode,
saveGroupCreator,
} from "server/features/user/group/groupRepository";
import { delLotterySignups } from "server/features/user/lottery-signup/lotterySignupRepository";
import { findUser } from "server/features/user/userRepository";
import { MongoDbError } from "shared/types/api/errors";
import {
PostCloseGroupResponse,
PostCreateGroupResponse,
GetGroupResponse,
PostJoinGroupResponse,
PostLeaveGroupResponse,
PostCreateGroupError,
PostJoinGroupError,
} from "shared/types/api/groups";
import {
makeErrorResult,
makeSuccessResult,
Result,
} from "shared/utils/result";
import { findProgramItems } from "server/features/program-item/programItemRepository";
import { getLotteryParticipantDirectSignups } from "server/features/assignment/utils/prepareAssignmentParams";
import { ProgramItem } from "shared/types/models/programItem";
import { getLotteryNotYetRunProgramItemIds } from "server/features/assignment/utils/getUpcomingLotterySignups";
export const generateGroupCode = (): string => {
const baseCode = randomBytes(5).toString("hex").slice(0, 9);
return [
baseCode.slice(0, 3),
baseCode.slice(3, 6),
baseCode.slice(6, 9),
].join("-");
};
const checkUpcomingDirectSignups = async (
username: string,
programItems: ProgramItem[],
timeNow: Dayjs,
): Promise<PostCreateGroupError | PostJoinGroupError | null> => {
const userDirectSignupsResult = await findUserDirectSignups(username);
Iif (!userDirectSignupsResult.ok) {
return {
message: "Error finding signups",
status: "error",
errorId: "unknown",
};
}
const lotteryParticipantDirectSignups = getLotteryParticipantDirectSignups(
userDirectSignupsResult.value,
programItems,
);
const userDirectSignupProgramItems = lotteryParticipantDirectSignups.flatMap(
(signup) => {
const found = programItems.find(
(programItem) => programItem.programItemId === signup.programItemId,
);
Iif (!found) {
return [];
}
return found;
},
);
const userHasUpcomingDirectSignups = userDirectSignupProgramItems.some(
(programItem) => timeNow.isBefore(dayjs(programItem.startTime)),
);
if (userHasUpcomingDirectSignups) {
return {
message: "User has upcoming direct signups",
status: "error",
errorId: "upcomingDirectSignups",
};
}
return null;
};
export const createGroup = async (
username: string,
): Promise<PostCreateGroupResponse> => {
const timeNowResult = await getTimeNow();
Iif (!timeNowResult.ok) {
return {
message: "Unable to get current time",
status: "error",
errorId: "unknown",
};
}
const programItemsResult = await findProgramItems();
Iif (!programItemsResult.ok) {
return {
message: "Error finding program items",
status: "error",
errorId: "unknown",
};
}
// User cannot have direct signups in future when joining a group
const hasUpcomingDirectSignups = await checkUpcomingDirectSignups(
username,
programItemsResult.value,
timeNowResult.value,
);
Iif (hasUpcomingDirectSignups) {
return hasUpcomingDirectSignups as PostCreateGroupError;
}
// Check if group exists or user is already in a group
const userResult = await findUser(username);
Iif (!userResult.ok) {
return {
message: "Error finding user when checking if a group exists",
status: "error",
errorId: "errorFindingUser",
};
}
const userResponse = userResult.value;
Iif (!userResponse) {
return {
message: "No matching user found",
status: "error",
errorId: "errorFindingUser",
};
}
if (userResponse.groupCode !== "0" || userResponse.isGroupCreator) {
return {
message: "User is a creator or a member of a group",
status: "error",
errorId: "groupExists",
};
}
// No existing group, create
const newGroupCode = generateGroupCode();
const saveGroupResponseResult = await saveGroupCreator(
newGroupCode,
true,
username,
);
Iif (!saveGroupResponseResult.ok) {
return {
message: "Save group failure",
status: "error",
errorId: "unknown",
};
}
return {
message: "Create group success",
status: "success",
groupCode: saveGroupResponseResult.value.groupCode,
};
};
export const joinGroup = async (
username: string,
groupCode: string,
): Promise<PostJoinGroupResponse> => {
const timeNowResult = await getTimeNow();
Iif (!timeNowResult.ok) {
return {
message: "Unable to get current time",
status: "error",
errorId: "unknown",
};
}
const timeNow = timeNowResult.value;
const programItemsResult = await findProgramItems();
Iif (!programItemsResult.ok) {
return {
message: "Error finding program items",
status: "error",
errorId: "unknown",
};
}
const programItems = programItemsResult.value;
// User cannot have direct signups in future when joining a group
const hasUpcomingDirectSignups = await checkUpcomingDirectSignups(
username,
programItems,
timeNow,
);
if (hasUpcomingDirectSignups) {
return hasUpcomingDirectSignups as PostJoinGroupError;
}
// Check if user is already in a group (or has created a group)
const userResult = await findUser(username);
Iif (!userResult.ok) {
return {
message: "Error finding user",
status: "error",
errorId: "errorFindingUser",
};
}
const user = userResult.value;
Iif (!user) {
return {
message: "User not found",
status: "error",
errorId: "unknown",
};
}
if (user.groupCode !== "0" || user.isGroupCreator) {
return {
message: "User is a creator or a member of a group",
status: "error",
errorId: "alreadyInGroup",
};
}
// Check if given group exists
const groupExistsResult = await checkGroupExists(groupCode);
Iif (!groupExistsResult.ok) {
return {
message: "Error finding group",
status: "error",
errorId: "unknown",
};
}
if (!groupExistsResult.value) {
return {
message: "Group does not exist",
status: "error",
errorId: "groupDoesNotExist",
};
}
// Clean lottery signups whose lottery has not yet run
const lotteryNotYetRunProgramItemIds = getLotteryNotYetRunProgramItemIds(
user.lotterySignups,
programItems,
timeNow,
);
if (lotteryNotYetRunProgramItemIds.length > 0) {
const saveLotterySignupsResult = await delLotterySignups([
{
lotterySignupProgramItemIds: lotteryNotYetRunProgramItemIds,
username,
},
]);
Iif (!saveLotterySignupsResult.ok) {
return {
message: "Error removing upcoming lottery signups",
status: "error",
errorId: "removeUpcomingLotterySignupsFailed",
};
}
}
// Group exists, join
const saveGroupResponseResult = await saveGroupCode(groupCode, username);
Iif (!saveGroupResponseResult.ok) {
return {
message: "Error saving group",
status: "error",
errorId: "unknown",
};
}
return {
message: "Joined to group success",
status: "success",
groupCode: saveGroupResponseResult.value.groupCode,
};
};
export const leaveGroup = async (
username: string,
): Promise<PostLeaveGroupResponse> => {
const userResult = await findUser(username);
Iif (!userResult.ok) {
return {
message: "Error finding user",
status: "error",
errorId: "unknown",
};
}
const user = userResult.value;
Iif (!user) {
return {
message: "User not found",
status: "error",
errorId: "unknown",
};
}
// Group creators must close the group, not leave it (leaving would orphan it)
if (user.isGroupCreator) {
return {
message: "Group creator cannot leave group, close it instead",
status: "error",
errorId: "creatorCannotLeave",
};
}
const saveGroupResponseResult = await saveGroupCode("0", username);
Iif (!saveGroupResponseResult.ok) {
return {
message: "Failed to leave group",
status: "error",
errorId: "failedToLeave",
};
}
return {
message: "Leave group success",
status: "success",
groupCode: saveGroupResponseResult.value.groupCode,
};
};
export const closeGroup = async (
groupCode: string,
username: string,
): Promise<PostCloseGroupResponse> => {
const groupMembersResult = await findGroupMembers(groupCode);
Iif (!groupMembersResult.ok) {
return {
message: "Unknown error",
status: "error",
errorId: "unknown",
};
}
const groupMembers = groupMembersResult.value;
// Check if group creator, only creator can close group
const groupCreator = groupMembers.find(
(groupMember) => groupMember.username === username,
);
if (!groupCreator?.isGroupCreator) {
return {
message: "Only group creator can close group",
status: "error",
errorId: "onlyCreatorCanCloseGroup",
};
}
const leaveGroupPromises = groupMembers.map(async (groupMember) => {
const saveGroupCodeResult = await saveGroupCode("0", groupMember.username);
Iif (!saveGroupCodeResult.ok) {
return makeErrorResult(MongoDbError.UNKNOWN_ERROR);
}
return makeSuccessResult();
});
const results = await Promise.all(leaveGroupPromises);
const someUpdateFailed = results.some((result) => !result.ok);
Iif (someUpdateFailed) {
return {
message: "Unknown error",
status: "error",
errorId: "unknown",
};
}
const removeGroupCreatorResult = await saveGroupCreator(
"0",
false,
groupCreator.username,
);
Iif (!removeGroupCreatorResult.ok) {
return {
message: "Error removing group creator status",
status: "error",
errorId: "unknown",
};
}
return {
message: "Group closed successfully",
status: "success",
groupCode: "0",
};
};
export const leaveOrCloseGroup = async (
username: string,
): Promise<Result<boolean, string>> => {
const userResult = await findUser(username);
Iif (!userResult.ok) {
return makeErrorResult("Error finding user");
}
const user = userResult.value;
Iif (!user) {
return makeErrorResult("User not found");
}
if (user.groupCode === "0") {
return makeSuccessResult(false);
}
if (user.isGroupCreator) {
const closeGroupResult = await closeGroup(user.groupCode, username);
Iif (closeGroupResult.status === "error") {
return makeErrorResult(closeGroupResult.message);
}
} else {
const leaveGroupResult = await leaveGroup(username);
Iif (leaveGroupResult.status === "error") {
return makeErrorResult(leaveGroupResult.message);
}
}
return makeSuccessResult(true);
};
export const fetchGroup = async (
groupCode: string,
username: string,
): Promise<GetGroupResponse> => {
// Only members of a group may read it; groupCode "0" is the sentinel for users not in any group
const findUserResult = await findUser(username);
Iif (!findUserResult.ok || !findUserResult.value) {
return {
message: "Getting group members failed",
status: "error",
errorId: "unknown",
};
}
if (groupCode === "0" || findUserResult.value.groupCode !== groupCode) {
return {
message: "User is not a member of the requested group",
status: "error",
errorId: "unknown",
};
}
const findGroupResultsResult = await findGroupMembers(groupCode);
Iif (!findGroupResultsResult.ok) {
return {
message: "Getting group members failed",
status: "error",
errorId: "unknown",
};
}
const returnData = findGroupResultsResult.value.map((result) => ({
groupCode: result.groupCode,
isGroupCreator: result.isGroupCreator,
lotterySignups: result.lotterySignups,
serial: result.serial,
username: result.username,
}));
return {
message: "Getting group members success",
status: "success",
results: returnData,
};
};
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