/// Supported GLP-1/GIP receptor agonists and their pharmacokinetic constants.
///
/// Half-lives follow the single-compartment decay values published in the
/// prescribing information:
/// * Semaglutide (Ozempic / Wegovy): ~168 hours (7 days)
/// * Tirzepatide (Mounjaro / Zepbound): ~120 hours (5 days)
/// * Liraglutide (Saxenda / Victoza): ~13 hours
enum Glp1Compound {
  semaglutide(
    displayName: 'Semaglutide',
    brandNames: 'Ozempic / Wegovy / Rybelsus',
    halfLifeHours: 168,
    dosingInterval: Duration(hours: 168),
    defaultDoseMg: 0.25,
    aliases: ['semaglutide', 'ozempic', 'wegovy', 'rybelsus'],
  ),
  tirzepatide(
    displayName: 'Tirzepatide',
    brandNames: 'Mounjaro / Zepbound',
    halfLifeHours: 120,
    dosingInterval: Duration(hours: 168),
    defaultDoseMg: 2.5,
    aliases: ['tirzepatide', 'mounjaro', 'zepbound'],
  ),
  liraglutide(
    displayName: 'Liraglutide',
    brandNames: 'Saxenda / Victoza',
    halfLifeHours: 13,
    dosingInterval: Duration(hours: 24),
    defaultDoseMg: 0.6,
    aliases: ['liraglutide', 'saxenda', 'victoza'],
  );

  const Glp1Compound({
    required this.displayName,
    required this.brandNames,
    required this.halfLifeHours,
    required this.dosingInterval,
    required this.defaultDoseMg,
    required this.aliases,
  });

  /// Generic compound name (e.g. `Tirzepatide`).
  final String displayName;

  /// Commercial brand names surfaced in the logging UI.
  final String brandNames;

  /// Elimination half-life `t_1/2` in hours, used by the pharmacokinetic
  /// serum-level calculator.
  final double halfLifeHours;

  /// Recommended interval between administrations (dose reminder cadence).
  final Duration dosingInterval;

  /// Titration starting dose used to pre-fill the logging form.
  final double defaultDoseMg;

  /// Lowercase names recognized when parsing free-text compound labels.
  final List<String> aliases;

  /// Resolves a compound from a user- or database-supplied name.
  ///
  /// Matching is case-insensitive and accepts generic names, brand names, and
  /// compound strings that merely contain an alias (e.g. `Semaglutide
  /// (compounded)`). Returns `null` for unrecognized compounds so callers can
  /// fall back to a default half-life.
  static Glp1Compound? tryParse(String? raw) {
    if (raw == null || raw.trim().isEmpty) return null;
    final normalized = raw.toLowerCase();

    for (final compound in values) {
      if (compound.aliases.contains(normalized)) return compound;
    }
    for (final compound in values) {
      if (compound.aliases.any(normalized.contains)) return compound;
    }
    return null;
  }
}