mobile app phase 1

packages/core/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "@timetoleave/core",
+  "version": "0.1.0",
+  "private": true,
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "typecheck": "tsc --noEmit",
+    "lint": "eslint src/"
+  },
+  "dependencies": {
+    "date-fns": "^4.1.0"
+  },
+  "devDependencies": {
+    "typescript": "^5"
+  }
+}

packages/core/src/countdown-utils.ts

@@ -0,0 +1,48 @@
+// Countdown utilities for TimeToLeave
+import { CountdownInfo } from "./types";
+
+export function calculateCountdown(targetDate: Date): CountdownInfo {
+  const now = new Date();
+  const diffMs = targetDate.getTime() - now.getTime();
+  const diffMin = Math.floor(diffMs / 60000);
+
+  if (diffMin <= 0) {
+    return {
+      label: "Now",
+      color: "red",
+      urgent: true,
+    };
+  }
+
+  if (diffMin <= 10) {
+    return {
+      label: `${diffMin}min`,
+      color: "orange",
+      urgent: true,
+    };
+  }
+
+  if (diffMin <= 30) {
+    return {
+      label: `${diffMin}min`,
+      color: "yellow",
+      urgent: false,
+    };
+  }
+
+  if (diffMin <= 60) {
+    return {
+      label: `${diffMin}min`,
+      color: "green",
+      urgent: false,
+    };
+  }
+
+  const hours = Math.floor(diffMin / 60);
+  const remainingMin = diffMin % 60;
+  return {
+    label: `${hours}h ${remainingMin}min`,
+    color: "blue",
+    urgent: false,
+  };
+}

packages/core/src/formatting.ts

@@ -0,0 +1,41 @@
+// Formatting utilities for TimeToLeave
+
+export function formatTime(date: Date): string {
+  return date.toLocaleTimeString("de-AT", { hour: "2-digit", minute: "2-digit" });
+}
+
+export function formatDate(date: Date): string {
+  return date.toLocaleDateString("de-AT", {
+    weekday: "short",
+    day: "numeric",
+    month: "long",
+    year: "numeric",
+  });
+}
+
+export function formatDateTime(date: Date): string {
+  return date.toLocaleString("de-AT", {
+    day: "numeric",
+    month: "long",
+    year: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+  });
+}
+
+export function formatDuration(seconds: number): string {
+  const hours = Math.floor(seconds / 3600);
+  const minutes = Math.floor((seconds % 3600) / 60);
+
+  if (hours > 0) {
+    return `${hours}h ${minutes}min`;
+  }
+  return `${minutes}min`;
+}
+
+export function formatDistance(meters: number): string {
+  if (meters < 1000) {
+    return `${meters}m`;
+  }
+  return `${(meters / 1000).toFixed(1)}km`;
+}

packages/core/src/hafas-time.ts

@@ -0,0 +1,115 @@
+// Timezone-aware parsing for HAFAS times.
+// HAFAS returns times in Vienna (CET/CEST). This module provides correct parsing
+// regardless of the server or browser timezone.
+
+// Helper: get the offset (in minutes) from UTC for a given instant in a specific
+// IANA timezone.
+//
+// CAVEAT — Hour-level precision only. This helper reads the hour via
+// Intl.DateTimeFormat (hour part only), so it returns incorrect results for
+// timezones with fractional-hour offsets (e.g. India +05:30, Nepal +05:45).
+// It is designed exclusively for "Europe/Vienna" (CET/CEST), which only uses
+// full-hour offsets (+01:00 / +02:00). Do not reuse for other timezones.
+function getTimezoneOffsetMinutes(instant: Date, tz: string): number {
+  const getHour = (timeZone: string) => {
+    const parts = new Intl.DateTimeFormat("en-US", {
+      timeZone,
+      hour: "2-digit",
+      hour12: false,
+    }).formatToParts(instant);
+    return parseInt(parts.find((p) => p.type === "hour")!.value, 10);
+  };
+
+  const utcH = getHour("UTC");
+  const tzH = getHour(tz);
+
+  let diff = tzH - utcH;
+  // Handle midnight wraparound:
+  // e.g. UTC 23 → Vienna 01: diff = -22, but actual offset is +2.
+  // Vienna is always between +1 and +2, so |diff| > 12 means we crossed midnight.
+  if (diff < -12) diff += 24;
+  if (diff > 12) diff -= 24;
+
+  return diff * 60;
+}
+
+/**
+ * Parse a HAFAS date+time string into a proper JavaScript Date.
+ * HAFAS dates are "YYYYMMDD" and times are "HHMMSS".
+ * The resulting Date represents the correct UTC instant for the Vienna local time.
+ *
+ * We try each plausible Vienna offset (CET +60 or CEST +120), compute the
+ * candidate UTC timestamp via Date.UTC, and verify by checking that Vienna's
+ * offset at that candidate instant matches the assumed offset. The first match
+ * wins. This correctly handles DST transitions.
+ *
+ * Ambiguous times during the fall-back DST transition (02:xx on Oct 27, 2024):
+ * HAFAS resolves ambiguous local times by using the post-transition (standard)
+ * interpretation. Our loop tries CET (+60) before CEST (+120), so ambiguous
+ * hours naturally resolve to CET — matching HAFAS convention. For example
+ * "023000" on "20241027" → Oct 27 01:30:00 UTC (the second 02:30, not the
+ * first).
+ */
+export function parseHafasTime(dateStr: string, timeStr: string): Date {
+  const y = parseInt(dateStr.slice(0, 4), 10);
+  const mo = parseInt(dateStr.slice(4, 6), 10) - 1;
+  const d = parseInt(dateStr.slice(6, 8), 10);
+  const h = parseInt(timeStr.slice(0, 2), 10);
+  const m = parseInt(timeStr.slice(2, 4), 10);
+  const s = parseInt(timeStr.slice(4, 6), 10);
+
+  for (const offsetMin of [60, 120]) {
+    const candidateTs = Date.UTC(y, mo, d, h, m, s, 0) - offsetMin * 60_000;
+    const actualOffset = getTimezoneOffsetMinutes(new Date(candidateTs), "Europe/Vienna");
+    if (actualOffset === offsetMin) {
+      return new Date(candidateTs);
+    }
+  }
+
+  // Fallback — should not happen for valid Vienna times.
+  // Treat as CET (+1).
+  return new Date(Date.UTC(y, mo, d, h, m, s, 0) - 60 * 60_000);
+}
+
+// Helper: extract date/time components of an instant in a given IANA timezone
+// via Intl.DateTimeFormat. Returns { year, month (1-based), day, hour, minute, second }.
+function getDateTimeParts(instant: Date, tz: string) {
+  const fmt = new Intl.DateTimeFormat("en-US", {
+    timeZone: tz,
+    year: "numeric",
+    month: "numeric",
+    day: "numeric",
+    hour: "2-digit",
+    minute: "numeric",
+    second: "numeric",
+    hour12: false,
+  });
+
+  const parts = fmt.formatToParts(instant);
+  const get = (type: string) => parseInt(parts.find((p) => p.type === type)!.value, 10);
+
+  return {
+    year: get("year"),
+    month: get("month"), // 1-based
+    day: get("day"),
+    hour: get("hour"),
+    minute: get("minute"),
+    second: get("second"),
+  };
+}
+
+/**
+ * Build HAFAS date and time strings from a JavaScript Date.
+ *
+ * Components are extracted in Europe/Vienna so the output is always a valid
+ * Vienna-local HAFAS timestamp, regardless of the server's timezone.
+ * This is the inverse of parseHafasTime: hafasDateTime(parseHafasTime(d, t))
+ * will return { date: d, time: t } for every valid Vienna date/time pair.
+ */
+export function hafasDateTime(date: Date): { date: string; time: string } {
+  const pad = (n: number) => String(n).padStart(2, "0");
+  const p = getDateTimeParts(date, "Europe/Vienna");
+  const d = `${p.year}${pad(p.month)}${pad(p.day)}`;
+  const t = `${pad(p.hour)}${pad(p.minute)}${pad(p.second)}000`;
+  return { date: d, time: t };
+}

packages/core/src/index.ts

@@ -0,0 +1,6 @@
+// Re-export everything for clean imports
+export * from './types';
+export * from './countdown-utils';
+export * from './formatting';
+export * from './status-utils';
+export * from './hafas-time';

packages/core/src/status-utils.ts

@@ -0,0 +1,16 @@
+// Status utilities for TimeToLeave
+import type { ServerStatus } from "./types";
+
+export class StatusUtils {
+  static async checkServerStatus(url: string): Promise<ServerStatus> {
+    try {
+      const res = await fetch(url, {
+        method: "HEAD",
+        signal: AbortSignal.timeout(5000),
+      });
+      return res.ok;
+    } catch {
+      return false;
+    }
+  }
+}

packages/core/src/types.ts

@@ -0,0 +1,110 @@
+// Core domain types
+
+export interface Event {
+  id: string;
+  title: string;
+  destination: string;
+  eventTime: Date;
+  source: string;
+}
+
+export interface CalendarEvent {
+  id: string;
+  title: string;
+  destination: string;
+  eventTime: string;
+  source: string;
+}
+
+export interface Station {
+  name: string;
+  extId: string;
+  lat?: number;
+  lng?: number;
+}
+
+export interface Journey {
+  id: string;
+  sD: Date; // scheduled departure
+  rD: Date; // real departure
+  sA: Date; // scheduled arrival
+  rA: Date; // real arrival
+  delay: number; // delay in minutes
+  platform: string;
+  changes: number;
+  trains: string[];
+  cancelled: boolean;
+}
+
+export interface BikeStep {
+  name: string;
+  distance: number;
+  duration: number;
+  instruction: string;
+}
+
+export interface BikeRoute {
+  distance: number;
+  duration: number;
+  steps: BikeStep[];
+}
+
+export interface CountdownInfo {
+  label: string;
+  color: string;
+  urgent: boolean;
+}
+
+export type LocState = "pending" | "granted" | "denied";
+export type CalStatus = null | "loading" | "ok" | "error";
+
+// ── Reminder Settings ──────────────────────────────────
+
+export interface ReminderSettings {
+  bufferMinutes: number;
+  enabled: boolean;
+}
+
+export type ServerStatus = boolean | null;
+
+export interface GeocodeResult {
+  lat: number;
+  lng: number;
+  display_name: string;
+}
+
+// WienerLinien types
+
+export interface WienerLinienLine {
+  name: string;
+  type?: string;
+}
+
+export interface WienerLinienStop {
+  id: string;
+  name: string;
+  lat: number;
+  lng: number;
+}
+
+export interface WienerLinienDeparture {
+  stopId: string;
+  line: WienerLinienLine;
+  direction: string;
+  departureTime: number;
+  delay?: number;
+}
+
+export interface WienerLinienMonitorResponse {
+  stops: {
+    stopId: string;
+    departures: WienerLinienDeparture[];
+  }[];
+}
+
+export interface NearbyStop {
+  id: string;
+  name: string;
+  lat: number;
+  lng: number;
+}

packages/core/tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules"]
+}