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Further improvement to room allocation algorithm to handle more compl…
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…ex schedule overlaps
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EdNutting committed Apr 14, 2022
1 parent 0ab5950 commit 78c01dd
Showing 1 changed file with 42 additions and 15 deletions.
57 changes: 42 additions & 15 deletions services/importer/src/tasks/autoAssignRooms.ts
Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,8 @@ import { gqlClient } from "@midspace/component-clients/graphqlClient";
import type { Session } from "@midspace/shared-types/import/program";
import { gql } from "@urql/core";
import * as R from "ramda";
import {
FindExistingDefaultRoomsDocument,
FindExistingDefaultRoomsQuery,
FindExistingDefaultRoomsQueryVariables,
} from "../generated/graphql";
import type { FindExistingDefaultRoomsQuery, FindExistingDefaultRoomsQueryVariables } from "../generated/graphql";
import { FindExistingDefaultRoomsDocument } from "../generated/graphql";
import { logger } from "../logger";
import { publishTask } from "../rabbitmq/tasks";
import { getJob, updateJob } from "./lib/job";
Expand Down Expand Up @@ -71,23 +68,30 @@ export async function autoAssignRoomsTask(jobId: string): Promise<boolean> {
);

if (sortedSessions.length > 0) {
let roomNumber = defaultRoomMaxNumber + 1;

logger.info({ sortedSessions }, "Assigning rooms to sessions");
let end = toMilliseconds(sortedSessions[0].event.start) + sortedSessions[0].event.duration * 60 * 1000;

sortedSessions[0].event.roomName = `Auditorium ${roomNumber}`;

const roomEndTimes: number[] = [];
for (let idx = 1; idx < sortedSessions.length; idx++) {
const session = sortedSessions[idx];
const start = toMilliseconds(session.event.start);
if (start < end) {
roomNumber++;
} else {
roomNumber = defaultRoomMaxNumber + 1;

let nextEndingRoomIndex = findIndexOfLowest(roomEndTimes);
while (nextEndingRoomIndex !== undefined) {
const end = roomEndTimes[nextEndingRoomIndex];
if (start >= end) {
roomEndTimes[nextEndingRoomIndex] = Number.POSITIVE_INFINITY;
} else {
break;
}

nextEndingRoomIndex = findIndexOfLowest(roomEndTimes);
}

const roomNumber =
insertAtFirstInfinityOrEnd(roomEndTimes, start + session.event.duration * 60 * 1000) +
1 +
defaultRoomMaxNumber;
session.event.roomName = `Auditorium ${roomNumber}`;
end = Math.max(end, start + session.event.duration * 60 * 1000);
}
}

Expand All @@ -108,6 +112,29 @@ export async function autoAssignRoomsTask(jobId: string): Promise<boolean> {
return true;
}

function findIndexOfLowest(arr: number[]): number | undefined {
let lowest = Number.POSITIVE_INFINITY;
let result: number | undefined;
for (let index = 0; index < arr.length; index++) {
if (arr[index] < lowest) {
lowest = arr[index];
result = index;
}
}
return result;
}

function insertAtFirstInfinityOrEnd(arr: number[], value: number): number {
for (let i = 0; i < arr.length; i++) {
if (arr[i] === Number.POSITIVE_INFINITY) {
arr[i] = value;
return i;
}
}
arr.push(value);
return arr.length - 1;
}

function hasNoAssignedRoomOrIsDefaultRoom(session: Session) {
return !session.event.roomName || session.event.roomName.startsWith("Auditorium ");
}
Expand Down

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