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import { countBy, groupBy } from "remeda";
import {
findProgramItems,
saveProgramItemPopularity,
} from "server/features/program-item/programItemRepository";
import {
Result,
makeErrorResult,
makeSuccessResult,
} from "shared/utils/result";
import { MongoDbError } from "shared/types/api/errors";
import { getTimeNow } from "server/features/assignment/utils/getTimeNow";
import { config } from "shared/config";
import { runAssignmentAlgorithm } from "server/features/assignment/utils/runAssignmentAlgorithm";
import { findUsers } from "server/features/user/userRepository";
import { findDirectSignups } from "server/features/direct-signup/directSignupRepository";
import { prepareAssignmentParams } from "server/features/assignment/utils/prepareAssignmentParams";
import { logger } from "server/utils/logger";
import { getPopularity } from "server/features/program-item-popularity/getPopularity";
export const updateProgramItemPopularity = async (): Promise<
Result<void, MongoDbError>
> => {
logger.info("Calculate program item popularity");
const usersResult = await findUsers();
Iif (!usersResult.ok) {
return usersResult;
}
const programItemsResult = await findProgramItems();
Iif (!programItemsResult.ok) {
return programItemsResult;
}
const directSignupsResult = await findDirectSignups();
Iif (!directSignupsResult.ok) {
return directSignupsResult;
}
const {
validLotterySignupsUsers,
validLotterySignupProgramItems,
lotteryParticipantDirectSignups,
} = prepareAssignmentParams(
usersResult.value,
programItemsResult.value,
directSignupsResult.value,
);
const programItemsByStartTimes = groupBy(
validLotterySignupProgramItems,
(programItem) => {
const parentStartTime = config
.event()
.startTimesByParentIds.get(programItem.parentId);
return dayjs(parentStartTime ?? programItem.startTime).toISOString();
},
);
const timeNowResult = await getTimeNow();
Iif (!timeNowResult.ok) {
return timeNowResult;
}
const futureStartTimes = Object.keys(programItemsByStartTimes).filter(
(startTime) => dayjs(startTime).isSameOrAfter(timeNowResult.value),
);
// TODO: Only update popularity for startTimes where lottery signup is open
const assignmentResults = futureStartTimes.map((startTime) => {
const result = runAssignmentAlgorithm(
config.event().assignmentAlgorithm,
validLotterySignupsUsers,
validLotterySignupProgramItems,
startTime,
lotteryParticipantDirectSignups,
);
return { result, startTime };
});
const successResults = assignmentResults.flatMap((assignmentResult) => {
Iif (!assignmentResult.result.ok) {
logger.error(
new Error(
`Popularity update: assignment for start time ${assignmentResult.startTime} failed: ${assignmentResult.result.error}`,
),
);
return [];
}
return assignmentResult.result.value;
});
const userAssignmentProgramIds = successResults
.flatMap((result) => result.results)
.map((result) => result.assignmentSignup.programItemId);
const programItemSignupsCounts = countBy(
userAssignmentProgramIds,
(id) => id,
);
const lotterySignups = validLotterySignupsUsers.flatMap(
(user) => user.lotterySignups,
);
const groupedLotterySignups = groupBy(
lotterySignups,
(signup) => signup.programItemId,
);
const programItemPopularityUpdates = Object.entries(
programItemSignupsCounts,
).flatMap(([programItemId, assignmentSignupCount]) => {
const programItem = validLotterySignupProgramItems.find(
(item) => item.programItemId === programItemId,
);
Iif (!programItem) {
return [];
}
return {
programItemId,
popularity: getPopularity({
minAttendance: programItem.minAttendance,
maxAttendance: programItem.maxAttendance,
assignmentSignupCount,
lotterySignups: groupedLotterySignups[programItemId],
}),
};
});
const saveProgramItemPopularityResult = await saveProgramItemPopularity(
programItemPopularityUpdates,
);
Iif (!saveProgramItemPopularityResult.ok) {
return makeErrorResult(MongoDbError.UNKNOWN_ERROR);
}
logger.info("Program item popularity updated");
return makeSuccessResult();
};
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