// Domain model for the F∆I Recl∆Im 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 {
  /// Kompakt-Code für enge Layouts.
  String get short => switch (this) {
        EvidenceTier.t1 => 'T1',
        EvidenceTier.t2 => 'T2',
        EvidenceTier.t3 => 'T3',
        EvidenceTier.t4 => 'T4',
      };

  /// Ein-Wort-Bedeutung, immer neben dem T-Code zu zeigen.
  String get headline => switch (this) {
        EvidenceTier.t1 => 'amtlich',
        EvidenceTier.t2 => 'Verband',
        EvidenceTier.t3 => 'Erhebung',
        EvidenceTier.t4 => 'Signal',
      };

  /// Lange Form für Listen, Tooltips, Legend-Texte.
  String get description => switch (this) {
        EvidenceTier.t1 =>
          'amtlich oder peer-reviewed (NKR, DESTATIS, ifo, ZEW)',
        EvidenceTier.t2 =>
          'Verbands-Erhebung (DIHK, IHK, ZDH, BDI)',
        EvidenceTier.t3 =>
          'eigene strukturierte Erhebung (Phase 2/3)',
        EvidenceTier.t4 =>
          'qualitatives Signal — nur Hinweis, keine Magnitude',
      };
}

/// Geltungsbereich — the geographic/legal scope a norm belongs to.
/// Nested by widening reach: Berlin ⊂ Deutschland ⊂ EU ⊂ Welt.
/// Every norm carries one so the UI can flag, at a glance, *which*
/// reform lever a figure speaks to (Bezirk/Senat, Bund, Brüssel,
/// or völkerrechtlich) — see Studie §5.3.
enum Jurisdiction {
  /// Landesrecht Berlin (BauO Bln, ASOG, …) — Senat/Bezirk lever.
  berlin,

  /// Bundesrecht (GewO, MiLoG, KassenSichV) — NKR/Bundestag lever.
  deutschland,

  /// EU-Recht (DSGVO, REFIT) — Reform-Hebel liegt in Brüssel.
  eu,

  /// Völker-/Welthandelsrecht (WTO, OECD, UN) — international.
  international,
}

extension JurisdictionLabel on Jurisdiction {
  /// Kompakt-Code für Chips und enge Layouts.
  String get short => switch (this) {
        Jurisdiction.berlin => 'BE',
        Jurisdiction.deutschland => 'DE',
        Jurisdiction.eu => 'EU',
        Jurisdiction.international => 'INT',
      };

  /// Voll ausgeschriebener Name.
  String get label => switch (this) {
        Jurisdiction.berlin => 'Berlin',
        Jurisdiction.deutschland => 'Deutschland',
        Jurisdiction.eu => 'EU',
        Jurisdiction.international => 'International',
      };

  /// Rechtsebene — für Tooltip und Legend.
  String get level => switch (this) {
        Jurisdiction.berlin => 'Landesrecht Berlin',
        Jurisdiction.deutschland => 'Bundesrecht',
        Jurisdiction.eu => 'Recht der Europäischen Union',
        Jurisdiction.international => 'Völker-/Welthandelsrecht',
      };

  /// Wo der Reform-Hebel ansetzt — die handlungsleitende Aussage.
  String get reformLever => switch (this) {
        Jurisdiction.berlin =>
          'Reform-Hebel: Senat / Bezirk (Land Berlin)',
        Jurisdiction.deutschland =>
          'Reform-Hebel: Bundestag / NKR (Bund)',
        Jurisdiction.eu =>
          'Reform-Hebel: Brüssel — DE-Streichung allein wirkt nicht',
        Jurisdiction.international =>
          'Reform-Hebel: völkerrechtlich (WTO / OECD / UN)',
      };

  /// Ableitung aus der ELI/CELEX-Kennung, wenn kein Feld gesetzt
  /// ist (Hub-Live-Modus liefert die ELI, nicht immer den Scope).
  ///   eli/eu/…           → eu
  ///   eli/land/be/…      → berlin
  ///   eli/bund/…         → deutschland
  ///   eli/int|un|wto/…   → international
  static Jurisdiction fromEli(String eli) {
    final e = eli.toLowerCase();
    if (e.contains('/eu/') || e.startsWith('eli/eu') || e.contains('celex')) {
      return Jurisdiction.eu;
    }
    if (e.contains('/land/be') || e.contains('/land/berlin') ||
        e.contains('/be/')) {
      return Jurisdiction.berlin;
    }
    if (e.contains('/int/') || e.contains('/un/') || e.contains('/wto/') ||
        e.contains('/oecd/')) {
      return Jurisdiction.international;
    }
    return Jurisdiction.deutschland;
  }

  /// Parse a serialized scope string from a hub flow bag, falling
  /// back to ELI-derivation when absent or unrecognized.
  static Jurisdiction parse(String? raw, {required String eli}) {
    switch (raw?.trim().toLowerCase()) {
      case 'berlin' || 'be' || 'land-berlin':
        return Jurisdiction.berlin;
      case 'deutschland' || 'de' || 'bund' || 'bundesrecht':
        return Jurisdiction.deutschland;
      case 'eu' || 'europa' || 'union':
        return Jurisdiction.eu;
      case 'international' || 'int' || 'welt' || 'global':
        return Jurisdiction.international;
      default:
        return fromEli(eli);
    }
  }
}

/// Aktualität einer Norm-Fassung relativ zu unserer Datenbasis.
/// Quelle der Wahrheit: `Norm.sourceSha256` gegen die aktuell
/// veröffentlichte Quelle + `standDate`. Surfaced als Badge, damit
/// eine veraltete Auswertung sofort erkennbar ist (Studie §5.3).
enum Freshness {
  /// Unsere Fassung == aktuell veröffentlichter Stand.
  current,

  /// Upstream geändert/aufgehoben — unsere Auswertung ist veraltet.
  superseded,

  /// Noch nicht gegen die Quelle abgeglichen.
  unknown,
}

extension FreshnessLabel on Freshness {
  String get label => switch (this) {
        Freshness.current => 'aktuell',
        Freshness.superseded => 'geändert',
        Freshness.unknown => 'ungeprüft',
      };

  String get description => switch (this) {
        Freshness.current =>
          'Fassung entspricht dem aktuell veröffentlichten Stand.',
        Freshness.superseded =>
          'Quelle wurde upstream geändert — Auswertung veraltet, '
              'Neubewertung nötig.',
        Freshness.unknown =>
          'Aktualität nicht gegen die Quelle abgeglichen.',
      };

  /// Stale-Zustände bekommen ein sichtbares Badge; `current` nicht.
  bool get needsBadge => this != Freshness.current;
}

/// 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 Absatz/paragraph of the actual normative text.
class NormParagraph {
  const NormParagraph({required this.number, required this.text});

  /// Source numbering as it appears, e.g. "(1)", "(2a)". Empty
  /// when the source has no Absatz numbering.
  final String number;
  final String text;
}

/// 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.jurisdiction,
    required this.standDate,
    required this.sourceUrl,
    required this.sourceSha256,
    this.freshness = Freshness.current,
    this.supersededNote,
    this.paragraphs = const [],
  });

  final String eli;
  final String title;
  final String jurabk;
  final String paragraph;

  /// Geltungsbereich — Berlin / Deutschland / EU / International.
  /// Surfaced as a scope badge wherever the norm appears.
  final Jurisdiction jurisdiction;

  final DateTime standDate;
  final String sourceUrl;
  final String sourceSha256;

  /// Aktualität dieser Fassung gegenüber der Quelle.
  final Freshness freshness;

  /// Optionaler Klartext-Hinweis, *was* sich geändert hat (z. B.
  /// "BEG IV hat §17 zum 1.1.2026 entschärft"). Nur gesetzt, wenn
  /// freshness != current.
  final String? supersededNote;

  /// The actual paragraphs of the norm text, normalised by
  /// `text.akoma-normalize` in live mode. In demo mode the
  /// fixture quotes the public source verbatim under §5 UrhG
  /// (amtliche Werke).
  final List<NormParagraph> paragraphs;
}

/// 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,
    this.componentSummary = const [],
    this.reviewedBy,
    this.reviewedAt,
  });

  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;

  /// Compact lines for at-a-glance reading on list views.
  /// One line per SKM-Komponente (P / F / T / h) plus optional
  /// extras — each carries its tier-tag inline. Empty list ⇒
  /// fall back to the notes field for the list view.
  final List<String> componentSummary;

  /// Jurist who confirmed this evaluation (the `by` of the hub
  /// approval). Null ⇒ not yet reviewed. Jurist review is OPTIONAL:
  /// the figure stands on its own; a review only *confirms* it.
  final String? reviewedBy;

  /// When the jurist signed off. Null ⇒ not reviewed.
  final DateTime? reviewedAt;

  /// True once a trusted jurist has confirmed this evaluation.
  bool get isReviewed => reviewedBy != null;
}