// Domain model for the F∆I Law-Heatmap client.
//
// These types are the lingua franca between the (eventually
// gRPC-fed) repository and the UI. Names mirror the Studie's
// §5.3 data model.

/// Evidence tier of the lowest-tier ingredient in a value.
/// Per Studie §6.7: "Regel der niedrigsten Stufe" — any composed
/// figure carries the tier of its weakest input.
enum EvidenceTier {
  /// Official / peer-reviewed: NKR, DESTATIS, ifo, ZEW.
  t1,

  /// Verbands-Erhebung: DIHK, BDI, ZDH, IHK.
  t2,

  /// Eigene strukturierte Erhebung (Phase 2/3).
  t3,

  /// Qualitatives Signal — pain indicator only, never magnitude.
  t4,
}

extension EvidenceTierLabel on EvidenceTier {
  String get short => switch (this) {
        EvidenceTier.t1 => 'T1',
        EvidenceTier.t2 => 'T2',
        EvidenceTier.t3 => 'T3',
        EvidenceTier.t4 => 'T4',
      };

  String get description => switch (this) {
        EvidenceTier.t1 => 'amtlich / peer-reviewed',
        EvidenceTier.t2 => 'Verband',
        EvidenceTier.t3 => 'eigene Erhebung',
        EvidenceTier.t4 => 'qualitatives Signal',
      };
}

/// A citable source — never an LLM, always a public document or
/// dataset reference. UI surfaces these next to every figure.
class Source {
  const Source({
    required this.label,
    required this.url,
    required this.tier,
    this.note,
  });

  final String label;
  final String url;
  final EvidenceTier tier;
  final String? note;
}

/// One atomic obligation (Pflicht) extracted from a norm.
/// Tuple shape matches Studie §6.3.
class Duty {
  const Duty({
    required this.modality,
    required this.addressee,
    required this.action,
    required this.frequency,
    required this.sourceNorm,
    this.authority,
    this.consequence,
  });

  final String modality; // OBLIGATION | PROHIBITION | …
  final String addressee;
  final String action;
  final String frequency;
  final String sourceNorm;
  final String? authority;
  final String? consequence;
}

/// One norm version — a versioned legal text identified by its
/// (synthetic for now) ELI/CELEX.
class Norm {
  const Norm({
    required this.eli,
    required this.title,
    required this.jurabk,
    required this.paragraph,
    required this.standDate,
    required this.sourceUrl,
    required this.sourceSha256,
  });

  final String eli;
  final String title;
  final String jurabk;
  final String paragraph;
  final DateTime standDate;
  final String sourceUrl;
  final String sourceSha256;
}

/// A heatmap point: one norm with its computed scores.
/// Axes mirror §6 in the study.
class Evaluation {
  const Evaluation({
    required this.norm,
    required this.skmEurPerYear,
    required this.benefitScore,
    required this.affectedCount,
    required this.frustScore,
    required this.tierLowest,
    required this.duties,
    required this.sources,
    required this.auditEventId,
    this.notes,
  });

  final Norm norm;

  /// Yearly bureaucracy cost across the addressee population.
  /// €/year, computed via SKM (`P × F × T × h`).
  final double skmEurPerYear;

  /// 0–5, composite of seven dimensions
  /// (safety / market / legal-certainty / EU-harmony / …).
  final double benefitScore;

  /// Number of addressees (KMU, Bürger, etc.). UI uses this for
  /// heatmap point size.
  final int affectedCount;

  /// 0–10, composite of readability + Verweistiefe + Akteurs-
  /// pluralität + Norm-Volatilität.
  final double frustScore;

  /// Lowest tier among all ingredients of any displayed figure.
  final EvidenceTier tierLowest;

  final List<Duty> duties;
  final List<Source> sources;

  /// Pointer into the Ch∆In audit log (SQLite event_log row).
  final String auditEventId;

  final String? notes;
}