import 'package:intl/intl.dart';

/// Locale-aware short date (S5-R4).
///
/// Replaces the old hardcoded `DD/MM/YYYY` pattern, which was wrong for
/// locales like en-US (M/D/Y) or ja (Y/M/D). [localeTag] accepts both
/// BCP-47 ('en-US') and ICU ('en_US') forms — intl canonicalizes them.
///
/// Date symbols for the active locale are loaded by
/// GlobalMaterialLocalizations, so any widget below MaterialApp can call
/// this safely.
String fechaCortaLocalizada(String localeTag, DateTime fecha) =>
    DateFormat.yMd(localeTag).format(fecha);

/// Day + abbreviated month, locale-aware (e.g. "28 jul" for `es`, "Jul 28"
/// for `en`) — item 21 / audit 9b.4 (t4:459), the big digit half of the
/// vacation screen's date-pair.
String diaMesLocalizado(String localeTag, DateTime fecha) =>
    DateFormat.MMMd(localeTag).format(fecha);

/// Full weekday name, locale-aware (e.g. "lunes"/"Monday") — item 21 /
/// audit 9b.4 (t4:459), the small caption under the day-month.
String nombreDiaSemanaLocalizado(String localeTag, DateTime fecha) =>
    DateFormat.EEEE(localeTag).format(fecha);

/// Full weekday + month + day, locale-aware (e.g. "lunes, 3 de agosto" for
/// `es`, "Monday, August 3" for `en`) — audit 9.4 (t4:419), the ringing
/// screen's date line between the schedule pill and the hero time.
String fechaLargaConDiaSemana(String localeTag, DateTime fecha) =>
    DateFormat.MMMMEEEEd(localeTag).format(fecha);

/// Short "d–d MON" range pill, locale-aware month abbreviation, uppercased
/// (e.g. "4–18 AGO" for `es`, "4–18 AUG" for `en`) — audit 7.3 (t4:332),
/// the vacation-row date-range pill on the Alarmas root. Always labels the
/// range with the END date's month: vacation ranges are short (days to a
/// couple of weeks), so a cross-month span is the rare case, and the
/// prototype itself only ever shows a single abbreviation.
String rangoFechasCorto(String localeTag, DateTime inicio, DateTime fin) {
  final dia = DateFormat.d(localeTag);
  final mes = DateFormat.MMM(localeTag).format(fin).toUpperCase();
  return '${dia.format(inicio)}–${dia.format(fin)} $mes';
}