import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';

// ── Couleurs custom ───────────────────────────────────────────────────────────
// Fond très sombre mais pas noir, vert fluo pour accent, elevation uniquement.
const kSurfaceBg = Color(0xFF12161C);
const kSurfaceCard = Color(0xFF1A1E26);
const kSurfaceElevated = Color(0xFF232730);
const kGreenAccent = Color(0xFF00E676);
const kGreenAccentDim = Color(0xFF00B85C);
const kRedAccent = Color(0xFFFF5252);
const kTextPrimary = Color(0xFFE8EAED);
const kTextSecondary = Color(0xFF9AA0A6);
const kDivider = Color(0xFF2C3038);

final ThemeData ynabDarkTheme = ThemeData(
  useMaterial3: true,
  brightness: Brightness.dark,
  colorScheme: ColorScheme.fromSeed(
    seedColor: kGreenAccent,
    brightness: Brightness.dark,
    surface: kSurfaceBg,
    primary: kGreenAccent,
    secondary: kGreenAccentDim,
    error: kRedAccent,
    onSurface: kTextPrimary,
    onSurfaceVariant: kTextSecondary,
    outline: kDivider,
  ),
  scaffoldBackgroundColor: kSurfaceBg,
  cardTheme: CardThemeData(
    color: kSurfaceCard,
    elevation: 2,
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(12),
    ),
    clipBehavior: Clip.antiAlias,
  ),
  navigationRailTheme: NavigationRailThemeData(
    backgroundColor: kSurfaceCard,
    indicatorColor: kGreenAccent.withAlpha(40),
    unselectedIconTheme: const IconThemeData(color: kTextSecondary),
    selectedIconTheme: const IconThemeData(color: kGreenAccent),
    unselectedLabelTextStyle: GoogleFonts.inter(
      color: kTextSecondary,
      fontSize: 11,
    ),
    selectedLabelTextStyle: GoogleFonts.inter(
      color: kGreenAccent,
      fontSize: 11,
      fontWeight: FontWeight.w600,
    ),
    labelType: NavigationRailLabelType.none,
  ),
  appBarTheme: AppBarTheme(
    backgroundColor: kSurfaceBg,
    elevation: 0,
    scrolledUnderElevation: 1,
    centerTitle: false,
    titleTextStyle: GoogleFonts.inter(
      fontSize: 20,
      fontWeight: FontWeight.w600,
      color: kTextPrimary,
    ),
    iconTheme: const IconThemeData(color: kTextSecondary),
  ),
  textTheme: GoogleFonts.interTextTheme(
    ThemeData.dark().textTheme.copyWith(
          headlineLarge: const TextStyle(color: kTextPrimary),
          headlineMedium: const TextStyle(color: kTextPrimary),
          headlineSmall: const TextStyle(color: kTextPrimary),
          titleLarge: const TextStyle(color: kTextPrimary),
          titleMedium: const TextStyle(color: kTextPrimary),
          titleSmall: const TextStyle(color: kTextPrimary),
          bodyLarge: const TextStyle(color: kTextPrimary),
          bodyMedium: const TextStyle(color: kTextPrimary, fontSize: 14),
          bodySmall: const TextStyle(color: kTextSecondary, fontSize: 12),
          labelLarge: const TextStyle(color: kTextPrimary),
          labelMedium: const TextStyle(color: kTextSecondary),
          labelSmall: const TextStyle(color: kTextSecondary),
        ),
  ),
  dividerTheme: const DividerThemeData(color: kDivider, thickness: 1),
  floatingActionButtonTheme: FloatingActionButtonThemeData(
    backgroundColor: kGreenAccent,
    foregroundColor: kSurfaceBg,
    elevation: 4,
    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
  ),
  inputDecorationTheme: InputDecorationTheme(
    filled: true,
    fillColor: kSurfaceElevated,
    border: OutlineInputBorder(
      borderRadius: BorderRadius.circular(12),
      borderSide: BorderSide.none,
    ),
    focusedBorder: OutlineInputBorder(
      borderRadius: BorderRadius.circular(12),
      borderSide: const BorderSide(color: kGreenAccent, width: 1.5),
    ),
    contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
  ),
  bottomSheetTheme: const BottomSheetThemeData(
    backgroundColor: kSurfaceCard,
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
    ),
  ),
  sliderTheme: SliderThemeData(
    activeTrackColor: kGreenAccent,
    thumbColor: kGreenAccent,
    inactiveTrackColor: kDivider,
    overlayColor: kGreenAccent.withAlpha(30),
  ),
  dialogTheme: DialogThemeData(
    backgroundColor: kSurfaceCard,
    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
  ),
);

// Utils
String formatCurrency(double amount) {
  final sign = amount < 0 ? '-' : '';
  final abs = amount.abs();
  final parts = abs.toStringAsFixed(2).split('.');
  final intPart = parts[0];
  final decPart = parts[1];
  final buf = StringBuffer();
  int count = 0;
  for (int i = intPart.length - 1; i >= 0; i--) {
    if (count > 0 && count % 3 == 0) buf.write(' ');
    buf.write(intPart[i]);
    count++;
  }
  final formatted = '${buf.toString().split('').reversed.join()},$decPart';
  return '$sign$formatted €';
}

String formatCurrencyShort(double amount) {
  final abs = amount.abs();
  if (abs >= 1000000) return '${(abs / 1000000).toStringAsFixed(1)} M';
  if (abs >= 1000) return '${(abs / 1000).toStringAsFixed(1)} k';
  return '${abs.toStringAsFixed(2)} €';
}