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import { BuildingId } from "../data/buildings";
import { getAvailableFloors } from "./buildingIndoorMaps";
import { findBuildingFromLocationText } from "./eventLocationBuildingMatcher";
export type EventDirectionsRequest = {
locationText: string;
detailsText: string;
};
export type EventIndoorTarget = {
buildingId: BuildingId;
floor: string | null;
startFloor: string | null;
floorSupported: boolean;
destinationRoom: string | null;
startRoom: string | null;
globalOriginRoom?: string | null;
globalOriginBuildingId?: BuildingId | null;
globalDestinationRoom?: string | null;
globalDestinationBuildingId?: BuildingId | null;
};
type RoomIndex = {
floor: string;
rooms: string[];
};
const MAX_REGEX_INPUT_LENGTH = 2048;
const MAX_REGEX_MATCHES = 200;
const MAX_REGEX_CAPTURE_LENGTH = 48;
const CLASSROOM_KEYWORD_REGEX = /\b(?:classroom|room|rm)\b/i;
const CLASSROOM_VALUE_REGEX =
/^[ \t]{0,6}[:#-]?[ \t]{0,6}([A-Z0-9][A-Z0-9 ./-]{0,119})/i;
const FLOOR_LINE_REGEX =
/\b(?:floor|flr|niveau)\b[ \t]{0,6}[:#-]?[ \t]{0,6}(S?\d{1,2})\b/i;
const ROOM_MARKER_REGEX =
/\b(?:RM|ROOM)\b[ \t]{0,6}[:#-]?[ \t]{0,6}([A-Z0-9][A-Z0-9.\-/]{0,23})\b/gi;
const PREFIXED_ROOM_REGEX =
/\b([A-Z]{1,3}[ \t]{0,3}-?[ \t]{0,3}S?\d[A-Z0-9.\-/]{0,15})\b/gi;
const ROOM_NUMBER_REGEX = /\b(S\d[-.]?\d{2,4}|\d{3,4})\b/gi;
const SUB_FLOOR_REGEX = /S(\d)/;
const DOTTED_FLOOR_REGEX = /\b(\d)\.\d{2,4}\b/;
const EXPLICIT_FLOOR_REGEX = /^[A-Z]{1,3}-?(\d)-/;
const ROOM_DIGITS_REGEX = /(\d{3,4})/;
const ROOM_AFTER_SUB_FLOOR_REGEX = /S\d[-.]?(\d{2,4})/;
const safeRegexInput = (value: string): string =>
value.length > MAX_REGEX_INPUT_LENGTH
? value.slice(0, MAX_REGEX_INPUT_LENGTH)
: value;
const normalizeRoom = (value: string): string =>
value
.toUpperCase()
.replaceAll(/[\u2013\u2014]/g, "-")
.replaceAll(/\s+/g, "")
.trim();
const compactRoom = (value: string): string =>
normalizeRoom(value).replaceAll(/[^A-Z0-9]/g, "");
const getRoomSuffix = (value: string): string => {
const normalized = normalizeRoom(value);
const lastSegment = normalized.split("-").at(-1) ?? normalized;
return lastSegment.replaceAll(/[^A-Z0-9.]/g, "");
};
const inferFloorFromCandidate = (
candidate: string,
buildingId: BuildingId,
): string | null => {
const normalized = normalizeRoom(candidate);
const subFloor = SUB_FLOOR_REGEX.exec(normalized);
if (subFloor?.[1]) return `S${subFloor[1]}`;
const dottedFloor = DOTTED_FLOOR_REGEX.exec(normalized);
Iif (dottedFloor?.[1]) return dottedFloor[1];
const explicit = EXPLICIT_FLOOR_REGEX.exec(normalized);
if (explicit?.[1]) return explicit[1];
const digits = ROOM_DIGITS_REGEX.exec(normalized);
if (digits?.[1]) {
const first = digits[1][0];
if (buildingId === "H") return first;
Eif (["LB", "VL", "VE", "CC", "MB"].includes(buildingId)) return first;
}
return null;
};
const tokenizeForMatch = (value: string): Set<string> => {
const normalized = normalizeRoom(value);
const compact = compactRoom(normalized);
const suffix = getRoomSuffix(normalized);
const tokens = new Set<string>();
Eif (compact.length >= 2) tokens.add(compact);
if (suffix.length >= 2) tokens.add(suffix.replaceAll(".", ""));
const digitsOnly = compact.replaceAll(/\D/g, "");
if (digitsOnly.length >= 3) tokens.add(digitsOnly);
const numbered = ROOM_DIGITS_REGEX.exec(normalized);
if (numbered?.[1]) tokens.add(numbered[1]);
const roomAfterSubFloor = ROOM_AFTER_SUB_FLOOR_REGEX.exec(normalized);
if (roomAfterSubFloor?.[1]) tokens.add(roomAfterSubFloor[1]);
return tokens;
};
const scoreRoomMatch = (
candidate: string,
room: string,
roomFloor: string,
buildingId: BuildingId,
): number => {
const normalizedCandidate = normalizeRoom(candidate);
const normalizedRoom = normalizeRoom(room);
const compactCandidate = compactRoom(normalizedCandidate);
const compactRoomId = compactRoom(normalizedRoom);
Iif (!compactCandidate || !compactRoomId) return Number.NEGATIVE_INFINITY;
let score = Number.NEGATIVE_INFINITY;
if (normalizedRoom === normalizedCandidate) {
score = 1200;
}
if (compactRoomId === compactCandidate) {
score = Math.max(score, 1150);
}
const suffixCandidate = getRoomSuffix(normalizedCandidate).replaceAll(
".",
"",
);
const suffixRoom = getRoomSuffix(normalizedRoom).replaceAll(".", "");
if (suffixCandidate.length >= 2 && suffixCandidate === suffixRoom) {
score = Math.max(score, 1050);
}
if (
compactCandidate.length >= 3 &&
compactRoomId.endsWith(compactCandidate)
) {
score = Math.max(score, 980);
}
const candidateTokens = tokenizeForMatch(normalizedCandidate);
const roomTokens = tokenizeForMatch(normalizedRoom);
let bestTokenLength = 0;
candidateTokens.forEach((token) => {
if (token.length >= 3 && roomTokens.has(token)) {
bestTokenLength = Math.max(bestTokenLength, token.length);
}
});
if (bestTokenLength > 0) {
score = Math.max(score, 820 + bestTokenLength);
}
if (!Number.isFinite(score)) {
return Number.NEGATIVE_INFINITY;
}
const inferredFloor = inferFloorFromCandidate(
normalizedCandidate,
buildingId,
);
Eif (inferredFloor) {
score += inferredFloor === roomFloor ? 120 : -80;
}
return score;
};
const pushCandidate = (set: Set<string>, value: string | undefined | null) => {
Iif (!value) return;
const normalized = normalizeRoom(value)
.replaceAll(/^RM[-:]?/g, "")
.replaceAll(/^ROOM[-:]?/g, "");
Eif (normalized.length >= 2) {
set.add(normalized);
}
};
const collectRegexMatches = (set: Set<string>, text: string, regex: RegExp) => {
const safeText = safeRegexInput(text);
regex.lastIndex = 0;
for (let i = 0; i < MAX_REGEX_MATCHES; i += 1) {
const match = regex.exec(safeText);
if (!match?.[1]) break;
pushCandidate(set, match[1].slice(0, MAX_REGEX_CAPTURE_LENGTH));
Iif (match[0].length === 0) {
regex.lastIndex += 1;
}
}
};
const extractClassroomLine = (detailsText: string): string | null => {
const safeDetailsText = safeRegexInput(detailsText);
const keywordMatch = CLASSROOM_KEYWORD_REGEX.exec(safeDetailsText);
if (!keywordMatch) return null;
const startIndex = keywordMatch.index + keywordMatch[0].length;
Iif (startIndex >= safeDetailsText.length) return null;
const tail = safeDetailsText.slice(startIndex);
const valueMatch = CLASSROOM_VALUE_REGEX.exec(tail);
const rawValue = valueMatch?.[1]?.trim();
return rawValue && rawValue.length > 0 ? rawValue : null;
};
const parseRoomCandidates = (
detailsText: string,
locationText: string,
): string[] => {
const candidates = new Set<string>();
const safeLocationText = safeRegexInput(locationText);
const safeDetailsText = safeRegexInput(detailsText);
const mergedText = `${safeLocationText}\n${safeDetailsText}`;
const classroomLine = extractClassroomLine(safeDetailsText);
if (classroomLine) {
collectRegexMatches(candidates, classroomLine, ROOM_MARKER_REGEX);
collectRegexMatches(candidates, classroomLine, PREFIXED_ROOM_REGEX);
collectRegexMatches(candidates, classroomLine, ROOM_NUMBER_REGEX);
const firstToken = classroomLine.trim().split(" ")[0];
pushCandidate(candidates, firstToken);
}
collectRegexMatches(candidates, mergedText, ROOM_MARKER_REGEX);
collectRegexMatches(candidates, mergedText, PREFIXED_ROOM_REGEX);
collectRegexMatches(candidates, mergedText, ROOM_NUMBER_REGEX);
return Array.from(candidates);
};
const resolveBestRoomMatch = (
roomCandidates: string[],
roomIndex: RoomIndex[],
buildingId: BuildingId,
): { room: string; floor: string } | null => {
if (!roomCandidates.length) return null;
let best: { room: string; floor: string; score: number } | null = null;
for (const floorEntry of roomIndex) {
for (const room of floorEntry.rooms) {
for (const candidate of roomCandidates) {
const score = scoreRoomMatch(
candidate,
room,
floorEntry.floor,
buildingId,
);
if (!Number.isFinite(score) || (best && score <= best.score)) continue;
best = { room, floor: floorEntry.floor, score };
}
}
}
return best && best.score >= 820
? { room: best.room, floor: best.floor }
: null;
};
const parseFloorCandidate = (
detailsText: string,
roomCandidates: string[],
buildingId: BuildingId,
): string | null => {
const floorFromDetails = FLOOR_LINE_REGEX.exec(
safeRegexInput(detailsText),
)?.[1]?.toUpperCase();
if (floorFromDetails) return floorFromDetails;
for (const candidate of roomCandidates) {
const inferred = inferFloorFromCandidate(candidate, buildingId);
if (inferred) return inferred;
}
return null;
};
const scoreStartRoom = (room: string): number => {
const lower = room.toLowerCase();
if (/(entrance|entry)/.test(lower)) return 100;
if (/elevator/.test(lower) && /main/.test(lower)) return 90;
Iif (/stairs?/.test(lower) && /main/.test(lower)) return 80;
Iif (/elevator/.test(lower)) return 70;
Iif (/stairs?/.test(lower)) return 60;
if (/exit/.test(lower) && !/emergency/.test(lower)) return 50;
Iif (/exit/.test(lower)) return 30;
return 0;
};
const resolveStartRoom = (
availableRooms: string[],
destinationRoom: string | null,
): string | null => {
if (availableRooms.length === 0) return null;
const pool = availableRooms.filter(
(room) => room.toUpperCase() !== destinationRoom?.toUpperCase(),
);
if (pool.length === 0) return null;
const scored = pool
.map((room) => ({ room, score: scoreStartRoom(room) }))
.sort((a, b) => b.score - a.score || a.room.localeCompare(b.room));
return scored[0].score > 0 ? scored[0].room : null;
};
const resolveSpecialStartRoom = (
availableRooms: string[],
buildingId: BuildingId,
floor: string,
): string | null => {
if (buildingId !== "MB" || !/^S\d+$/i.test(floor)) {
return null;
}
const elevators = availableRooms
.filter((room) => /elevator/i.test(room))
.sort((a, b) => {
const aMain = /main/i.test(a) ? 1 : 0;
const bMain = /main/i.test(b) ? 1 : 0;
if (aMain !== bMain) return bMain - aMain;
return a.localeCompare(b);
});
return elevators[0] ?? null;
};
const getPreferredStartFloor = (
buildingId: BuildingId,
availableFloors: string[],
destinationFloor: string,
): string => {
// Mirror backend entrance-floor behavior where possible.
Iif (buildingId === "LB" && availableFloors.includes("2")) return "2";
if (availableFloors.includes("1")) return "1";
Eif (availableFloors.includes(destinationFloor)) return destinationFloor;
return availableFloors[0] ?? destinationFloor;
};
const resolveStartRoomForFloor = (
rooms: string[],
buildingId: BuildingId,
floor: string,
destinationRoom: string | null,
): string | null =>
resolveSpecialStartRoom(rooms, buildingId, floor) ??
resolveStartRoom(rooms, destinationRoom);
export const buildEventIndoorTarget = async (
request: EventDirectionsRequest,
): Promise<EventIndoorTarget | null> => {
const building =
findBuildingFromLocationText(request.locationText) ||
findBuildingFromLocationText(request.detailsText) ||
findBuildingFromLocationText(
`${request.locationText} ${request.detailsText}`,
);
if (!building) return null;
const buildingId = building.id;
const availableFloors = getAvailableFloors(buildingId);
if (!availableFloors.length) {
return {
buildingId,
floor: null,
startFloor: null,
floorSupported: false,
destinationRoom: null,
startRoom: null,
};
}
const roomCandidates = parseRoomCandidates(
request.detailsText,
request.locationText,
);
const roomIndex = await Promise.all(
availableFloors.map(async (floor): Promise<RoomIndex> => {
try {
const fetched = await getAvailableRooms(buildingId, floor);
return {
floor,
rooms: Array.isArray(fetched) ? fetched : [],
};
} catch {
return { floor, rooms: [] };
}
}),
);
const bestMatch = resolveBestRoomMatch(roomCandidates, roomIndex, buildingId);
const explicitFloor = parseFloorCandidate(
request.detailsText,
roomCandidates,
buildingId,
);
const resolvedFloor = bestMatch?.floor ?? explicitFloor ?? null;
const floorSupported =
!!resolvedFloor && availableFloors.includes(resolvedFloor);
if (!floorSupported || !resolvedFloor) {
return {
buildingId,
floor: resolvedFloor,
startFloor: null,
floorSupported: false,
destinationRoom: bestMatch?.room ?? roomCandidates[0] ?? null,
startRoom: null,
};
}
const floorRooms =
roomIndex.find((entry) => entry.floor === resolvedFloor)?.rooms ?? [];
const destinationRoom = bestMatch?.room ?? roomCandidates[0] ?? null;
const preferredStartFloor = getPreferredStartFloor(
buildingId,
availableFloors,
resolvedFloor,
);
const preferredStartFloorRooms =
roomIndex.find((entry) => entry.floor === preferredStartFloor)?.rooms ?? [];
let startFloor = preferredStartFloor;
let startRoom = resolveStartRoomForFloor(
preferredStartFloorRooms,
buildingId,
preferredStartFloor,
destinationRoom,
);
// If we cannot resolve a meaningful start room on the preferred entrance floor,
// fall back to destination-floor start behavior.
if (!startRoom && preferredStartFloor !== resolvedFloor) {
startFloor = resolvedFloor;
startRoom = resolveStartRoomForFloor(
floorRooms,
buildingId,
resolvedFloor,
destinationRoom,
);
}
if (!startRoom) {
startFloor = resolvedFloor;
}
return {
buildingId,
floor: resolvedFloor,
startFloor,
floorSupported: true,
destinationRoom,
startRoom,
};
};
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