/// Display formatting shared across screens.
///
/// Ported from `com.rippr.ui.Format`.
///
/// Timestamps come from the platform location fix, which is UTC epoch millis, so
/// everything here converts to the device zone. Formatting in UTC would show a 21:00
/// ride as tomorrow.
library;

import 'package:intl/intl.dart';

import '../domain/models.dart';

// Built per call rather than cached in a top-level final. The Kotlin original captured
// Locale.getDefault() once at class-init; doing the same here would freeze the format
// for the process lifetime and ignore a locale change.
DateFormat get _dayTime => DateFormat("EEE d MMM '·' HH:mm");
DateFormat get _fileStamp => DateFormat('yyyy-MM-dd-HHmm');

String formatDateTime(int epochMillis) =>
    _dayTime.format(DateTime.fromMillisecondsSinceEpoch(epochMillis));

String formatFileTimestamp(int epochMillis) =>
    _fileStamp.format(DateTime.fromMillisecondsSinceEpoch(epochMillis));

/// A trip's own name, or a date-derived label when it has none.
String tripLabel(Trip trip) => trip.name ?? formatDateTime(trip.startedAt);

String formatDistance(double meters) => meters < 1000
    ? '${meters.toInt()} m'
    : '${(meters / 1000).toStringAsFixed(1)} km';

String formatSpeed(double kmh) => '${kmh.toStringAsFixed(1)} km/h';

String formatElevation(double meters) => '${meters.toInt()} m';