/// Local transaction categories and per-transaction annotations.
library;

import 'package:flutter/material.dart';

/// User-facing spend / income categories (stored locally, not on the bank API).
enum TxCategory {
  uncategorized,
  groceries,
  energy,
  salary,
  mortgage,
  transport,
  dining,
  shopping,
  health,
  transfer,
  other,
}

extension TxCategoryX on TxCategory {
  String get label => switch (this) {
        TxCategory.uncategorized => 'Uncategorized',
        TxCategory.groceries => 'Groceries',
        TxCategory.energy => 'Energy',
        TxCategory.salary => 'Salary',
        TxCategory.mortgage => 'Mortgage',
        TxCategory.transport => 'Transport',
        TxCategory.dining => 'Dining',
        TxCategory.shopping => 'Shopping',
        TxCategory.health => 'Health',
        TxCategory.transfer => 'Transfer',
        TxCategory.other => 'Other',
      };

  IconData get icon => switch (this) {
        TxCategory.uncategorized => Icons.label_outline,
        TxCategory.groceries => Icons.shopping_cart_outlined,
        TxCategory.energy => Icons.bolt_outlined,
        TxCategory.salary => Icons.payments_outlined,
        TxCategory.mortgage => Icons.home_work_outlined,
        TxCategory.transport => Icons.directions_bus_outlined,
        TxCategory.dining => Icons.restaurant_outlined,
        TxCategory.shopping => Icons.shopping_bag_outlined,
        TxCategory.health => Icons.local_hospital_outlined,
        TxCategory.transfer => Icons.swap_horiz,
        TxCategory.other => Icons.more_horiz,
      };

  Color get color => switch (this) {
        TxCategory.uncategorized => const Color(0xFF64748B),
        TxCategory.groceries => const Color(0xFF16A34A),
        TxCategory.energy => const Color(0xFFEAB308),
        TxCategory.salary => const Color(0xFF0F766E),
        TxCategory.mortgage => const Color(0xFF7C3AED),
        TxCategory.transport => const Color(0xFF2563EB),
        TxCategory.dining => const Color(0xFFEA580C),
        TxCategory.shopping => const Color(0xFFDB2777),
        TxCategory.health => const Color(0xFFDC2626),
        TxCategory.transfer => const Color(0xFF0891B2),
        TxCategory.other => const Color(0xFF57534E),
      };

  static TxCategory fromName(String? name) {
    if (name == null || name.isEmpty) return TxCategory.uncategorized;
    return TxCategory.values.firstWhere(
      (c) => c.name == name,
      orElse: () => TxCategory.uncategorized,
    );
  }
}

/// Local overlay for a bank transaction.
class TxMeta {
  const TxMeta({
    this.category = TxCategory.uncategorized,
    this.recurring = false,
    this.notes = '',
  });

  final TxCategory category;
  final bool recurring;
  final String notes;

  static const empty = TxMeta();

  bool get hasCategory => category != TxCategory.uncategorized;
  bool get hasNotes => notes.trim().isNotEmpty;

  TxMeta copyWith({
    TxCategory? category,
    bool? recurring,
    String? notes,
  }) {
    return TxMeta(
      category: category ?? this.category,
      recurring: recurring ?? this.recurring,
      notes: notes ?? this.notes,
    );
  }

  Map<String, dynamic> toJson() => {
        'category': category.name,
        'recurring': recurring,
        'notes': notes,
      };

  factory TxMeta.fromJson(Map<String, dynamic> json) {
    return TxMeta(
      category: TxCategoryX.fromName(json['category'] as String?),
      recurring: json['recurring'] as bool? ?? false,
      notes: json['notes'] as String? ?? '',
    );
  }
}

/// Notes / recurring template keyed by exact merchant+amount match.
class TxExactTemplate {
  const TxExactTemplate({this.notes = '', this.recurring = false});

  final String notes;
  final bool recurring;

  Map<String, dynamic> toJson() => {
        'notes': notes,
        'recurring': recurring,
      };

  factory TxExactTemplate.fromJson(Map<String, dynamic> json) {
    return TxExactTemplate(
      notes: json['notes'] as String? ?? '',
      recurring: json['recurring'] as bool? ?? false,
    );
  }
}