import 'package:intl/intl.dart';

/// Parses an API timestamp field that may arrive as int, double, or string.
/// Returns null for missing, empty, unparseable, or non-positive values
/// (a non-positive epoch is treated as "no value" by the API).
int? unixTimestampFromJson(dynamic value) {
  if (value == null) return null;
  int? parsed;
  if (value is int) {
    parsed = value;
  } else if (value is num) {
    parsed = value.toInt();
  } else if (value is String) {
    final trimmed = value.trim();
    if (trimmed.isEmpty) return null;
    parsed = int.tryParse(trimmed);
  }
  if (parsed == null || parsed <= 0) return null;
  return parsed;
}

/// Converts a Unix timestamp from the API to a display string.
///
/// The API contract is seconds since epoch, but some legacy fields still
/// emit milliseconds. Anything past the year 2286 in seconds (>1e10) is
/// assumed to be milliseconds and converted down. Remove this branch once
/// every endpoint has been migrated to seconds.
String timeConvertor(int? unix, {bool hasTime = false}) {
  if (unix == null || unix <= 0) return '-';

  final seconds = unix > 9999999999 ? unix ~/ 1000 : unix;
  final date = DateTime.fromMillisecondsSinceEpoch(
    seconds * 1000,
    isUtc: true,
  ).toLocal();

  if (hasTime) {
    return DateFormat('yyyy-MM-dd HH:mm').format(date);
  }
  return DateFormat('yyyy-MM-dd').format(date);
}