import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../tokens/app_colors.dart';
import '../tokens/app_typography.dart';

/// UnionFlow Mobile App — Thème Global
///
/// Palette WCAG 2.1 validée :
///   Primary  : #2563EB  [5.7:1 ✅ WCAG AA]
///   Dark mode: #0A0D1A  [Navy profond]
class AppTheme {

  // ─── THÈME CLAIR ──────────────────────────────────────────────────────────

  static final ThemeData lightTheme = ThemeData(
    useMaterial3: true,
    brightness: Brightness.light,
    primaryColor: AppColors.primary,
    scaffoldBackgroundColor: AppColors.background,
    colorScheme: const ColorScheme.light(
      primary: AppColors.primary,
      onPrimary: Colors.white,
      primaryContainer: AppColors.primaryContainer,
      onPrimaryContainer: Color(0xFF1E3A8A),
      secondary: AppColors.accent,
      onSecondary: Colors.white,
      tertiary: Color(0xFF5297FF),
      surface: AppColors.surface,
      onSurface: AppColors.textPrimary,
      error: AppColors.error,
      onError: Colors.white,
      outline: AppColors.border,
    ),

    textTheme: const TextTheme(
      titleMedium: AppTypography.headerSmall,
      bodyMedium: AppTypography.bodyTextSmall,
      bodySmall: AppTypography.subtitleSmall,
      labelLarge: AppTypography.actionText,
      labelSmall: AppTypography.badgeText,
    ).apply(
      bodyColor: AppColors.textPrimary,
      displayColor: AppColors.textPrimary,
    ).copyWith(
      // .apply() ne propage pas bodyColor aux styles label* (comportement Flutter documenté)
      // → on les force explicitement ici pour le light mode
      titleMedium: AppTypography.headerSmall.copyWith(color: AppColors.textTitle),
      labelLarge: AppTypography.actionText.copyWith(color: AppColors.textTitle),
      labelSmall: AppTypography.badgeText.copyWith(color: AppColors.textPrimary),
    ),

    appBarTheme: AppBarTheme(
      backgroundColor: AppColors.surface,
      foregroundColor: AppColors.textPrimary,
      elevation: 0,
      scrolledUnderElevation: 0,
      centerTitle: true,
      surfaceTintColor: Colors.transparent,
      systemOverlayStyle: const SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: Brightness.dark,
      ),
      iconTheme: const IconThemeData(
        color: AppColors.textPrimary,
        size: 20,
      ),
      titleTextStyle: AppTypography.headerSmall.copyWith(
        color: AppColors.textPrimary,
      ),
    ),

    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        backgroundColor: AppColors.primary,
        foregroundColor: Colors.white,
        elevation: 0,
        textStyle: AppTypography.actionText,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(20),
        ),
        minimumSize: const Size(64, 40),
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
      ),
    ),

    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        foregroundColor: AppColors.primary,
        side: const BorderSide(color: AppColors.primary),
        textStyle: AppTypography.actionText,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(20),
        ),
        minimumSize: const Size(64, 40),
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
      ),
    ),

    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        foregroundColor: AppColors.primary,
        textStyle: AppTypography.actionText,
      ),
    ),

    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: AppColors.surface,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.border),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.border),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.primary, width: 2),
      ),
      errorBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.error),
      ),
      labelStyle: const TextStyle(color: AppColors.textSecondary),
      hintStyle: const TextStyle(color: AppColors.textTertiary),
    ),

    bottomNavigationBarTheme: const BottomNavigationBarThemeData(
      backgroundColor: AppColors.surface,
      selectedItemColor: AppColors.primary,
      unselectedItemColor: AppColors.textSecondary,
      showSelectedLabels: false,
      showUnselectedLabels: false,
      elevation: 8,
      type: BottomNavigationBarType.fixed,
    ),

    chipTheme: ChipThemeData(
      backgroundColor: AppColors.primaryContainer,
      selectedColor: AppColors.primary,
      labelStyle: AppTypography.labelMedium,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(8),
      ),
    ),

    dividerTheme: const DividerThemeData(
      color: AppColors.border,
      thickness: 1,
      space: 1,
    ),

    cardTheme: CardThemeData(
      color: AppColors.surface,
      elevation: 0,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
        side: const BorderSide(color: AppColors.border),
      ),
      margin: EdgeInsets.zero,
    ),

    snackBarTheme: SnackBarThemeData(
      backgroundColor: AppColors.textPrimary,
      contentTextStyle: AppTypography.bodyTextSmall.copyWith(
        color: Colors.white,
      ),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
      ),
      behavior: SnackBarBehavior.fixed,
    ),
  );

  // ─── THÈME SOMBRE (Navy Profond) ──────────────────────────────────────────

  static final ThemeData darkTheme = ThemeData(
    useMaterial3: true,
    brightness: Brightness.dark,
    primaryColor: AppColors.primaryLight,
    scaffoldBackgroundColor: AppColors.backgroundDark,
    colorScheme: const ColorScheme.dark(
      primary: AppColors.primaryLight,
      onPrimary: Color(0xFF1E3A8A),
      primaryContainer: Color(0xFF1A2350),
      onPrimaryContainer: Color(0xFFD6E8FF),
      secondary: AppColors.accentLight,
      onSecondary: Color(0xFF2A006F),
      surface: AppColors.surfaceDark,
      onSurface: AppColors.textPrimaryDark,
      error: AppColors.error,
      onError: Colors.white,
      outline: AppColors.borderDark,
    ),

    textTheme: const TextTheme(
      titleMedium: AppTypography.headerSmall,
      bodyMedium: AppTypography.bodyTextSmall,
      bodySmall: AppTypography.subtitleSmall,
      labelLarge: AppTypography.actionText,
      labelSmall: AppTypography.badgeText,
    ).apply(
      bodyColor: AppColors.textPrimaryDark,
      displayColor: AppColors.textPrimaryDark,
    ).copyWith(
      // .apply() ne propage pas bodyColor aux styles label* (comportement Flutter documenté)
      // → on les force explicitement ici pour le dark mode
      titleMedium: AppTypography.headerSmall.copyWith(color: AppColors.textTitleDark),
      labelLarge: AppTypography.actionText.copyWith(color: AppColors.textTitleDark),
      labelSmall: AppTypography.badgeText.copyWith(color: AppColors.textPrimaryDark),
    ),

    appBarTheme: AppBarTheme(
      backgroundColor: AppColors.backgroundDark,
      foregroundColor: AppColors.textPrimaryDark,
      elevation: 0,
      scrolledUnderElevation: 0,
      centerTitle: true,
      surfaceTintColor: Colors.transparent,
      systemOverlayStyle: const SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: Brightness.light,
      ),
      iconTheme: const IconThemeData(
        color: AppColors.textPrimaryDark,
        size: 20,
      ),
      titleTextStyle: AppTypography.headerSmall.copyWith(
        color: AppColors.textPrimaryDark,
      ),
    ),

    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        backgroundColor: AppColors.primary,
        foregroundColor: Colors.white,
        elevation: 0,
        textStyle: AppTypography.actionText,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(20),
        ),
        minimumSize: const Size(64, 40),
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
      ),
    ),

    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        foregroundColor: AppColors.primaryLight,
        side: const BorderSide(color: AppColors.primaryLight),
        textStyle: AppTypography.actionText,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(20),
        ),
        minimumSize: const Size(64, 40),
        padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
      ),
    ),

    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        foregroundColor: AppColors.primaryLight,
        textStyle: AppTypography.actionText,
      ),
    ),

    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: AppColors.surfaceDark,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.borderDark),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.borderDark),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.primaryLight, width: 2),
      ),
      errorBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: AppColors.error),
      ),
      labelStyle: const TextStyle(color: AppColors.textSecondaryDark),
      hintStyle: TextStyle(color: AppColors.textSecondaryDark.withOpacity(0.6)),
    ),

    bottomNavigationBarTheme: const BottomNavigationBarThemeData(
      backgroundColor: AppColors.backgroundDark,
      selectedItemColor: AppColors.primaryLight,
      unselectedItemColor: AppColors.textSecondaryDark,
      showSelectedLabels: false,
      showUnselectedLabels: false,
      elevation: 8,
      type: BottomNavigationBarType.fixed,
    ),

    dividerTheme: const DividerThemeData(
      color: AppColors.borderDark,
      thickness: 1,
      space: 1,
    ),

    cardTheme: CardThemeData(
      color: AppColors.surfaceDark,
      elevation: 0,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
        side: const BorderSide(color: AppColors.borderDark),
      ),
      margin: EdgeInsets.zero,
    ),

    snackBarTheme: SnackBarThemeData(
      backgroundColor: AppColors.surfaceDark,
      contentTextStyle: AppTypography.bodyTextSmall.copyWith(
        color: AppColors.textPrimaryDark,
      ),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
      ),
      behavior: SnackBarBehavior.fixed,
    ),
  );
}