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

class AppTheme {
  // Shadow helpers
  static List<BoxShadow> get shadowSm => [
    const BoxShadow(
      color: AppColors.shadow,
      blurRadius: 2,
      offset: Offset(0, 1),
    ),
  ];

  static List<BoxShadow> get shadowMd => [
    const BoxShadow(
      color: AppColors.shadowMedium,
      blurRadius: 6,
      offset: Offset(0, 4),
    ),
  ];

  static List<BoxShadow> get shadowLg => [
    const BoxShadow(
      color: AppColors.shadowLarge,
      blurRadius: 15,
      offset: Offset(0, 10),
    ),
  ];

  static List<BoxShadow> get shadowXl => [
    const BoxShadow(
      color: AppColors.shadowXLarge,
      blurRadius: 25,
      offset: Offset(0, 20),
    ),
  ];

  static ThemeData lightTheme() {
    final colorScheme = ColorScheme.light(
      primary: AppColors.primary,
      secondary: AppColors.secondary,
      error: AppColors.error,
      surface: AppColors.surface,
      surfaceContainerHighest: AppColors.surfaceVariant,
      onPrimary: Colors.white,
      onSecondary: AppColors.textPrimary,
      onError: Colors.white,
      onSurface: AppColors.textPrimary,
      outline: AppColors.outline,
      outlineVariant: AppColors.outlineVariant,
      shadow: AppColors.shadow,
      primaryContainer: AppColors.secondary.withValues(alpha: 0.2),
      onPrimaryContainer: AppColors.primary,
    );

    final textTheme = GoogleFonts.interTextTheme(
      TextTheme(
        // Display styles (32px, 28px)
        displayLarge: TextStyle(
          fontSize: 32,
          fontWeight: FontWeight.w700,
          color: colorScheme.onSurface,
          height: 1.2,
        ),
        displayMedium: TextStyle(
          fontSize: 28,
          fontWeight: FontWeight.w700,
          color: colorScheme.onSurface,
          height: 1.2,
        ),

        // Headline styles (24px, 20px)
        headlineLarge: TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.w600,
          color: colorScheme.onSurface,
          height: 1.3,
        ),
        headlineMedium: TextStyle(
          fontSize: 20,
          fontWeight: FontWeight.w600,
          color: colorScheme.onSurface,
          height: 1.3,
        ),

        // Title styles (18px, 16px, 14px)
        titleLarge: TextStyle(
          fontSize: 18,
          fontWeight: FontWeight.w600,
          color: colorScheme.onSurface,
          height: 1.4,
        ),
        titleMedium: TextStyle(
          fontSize: 16,
          fontWeight: FontWeight.w600,
          color: colorScheme.onSurface,
          height: 1.4,
        ),
        titleSmall: TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w600,
          color: colorScheme.onSurface,
          height: 1.4,
        ),

        // Body styles (16px, 14px, 12px)
        bodyLarge: TextStyle(
          fontSize: 16,
          fontWeight: FontWeight.w400,
          color: colorScheme.onSurface,
          height: 1.5,
        ),
        bodyMedium: TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w400,
          color: colorScheme.onSurface,
          height: 1.5,
        ),
        bodySmall: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w400,
          color: colorScheme.onSurface,
          height: 1.5,
        ),

        // Label styles (14px, 12px, 10px)
        labelLarge: TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w500,
          color: colorScheme.onSurface,
          height: 1.4,
        ),
        labelMedium: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w500,
          color: colorScheme.onSurface,
          height: 1.4,
        ),
        labelSmall: TextStyle(
          fontSize: 10,
          fontWeight: FontWeight.w500,
          color: colorScheme.onSurface,
          height: 1.4,
        ),
      ),
    );

    return ThemeData(
      useMaterial3: true,
      colorScheme: colorScheme,
      textTheme: textTheme,
      scaffoldBackgroundColor: AppColors.background,

      // AppBar theme
      appBarTheme: AppBarTheme(
        backgroundColor: AppColors.surface,
        foregroundColor: colorScheme.onSurface,
        elevation: 0,
        centerTitle: false,
        titleTextStyle: textTheme.headlineLarge,
      ),

      // Card theme
      cardTheme: CardThemeData(
        color: AppColors.surface,
        elevation: 0,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          side: BorderSide(color: colorScheme.outline, width: 1),
        ),
        margin: const EdgeInsets.all(AppSpacing.sm),
      ),

      // Input decoration theme
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: AppColors.surface,
        contentPadding: const EdgeInsets.symmetric(
          horizontal: AppSpacing.md,
          vertical: AppSpacing.md,
        ),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          borderSide: BorderSide(color: colorScheme.outline),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          borderSide: BorderSide(color: colorScheme.outline),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          borderSide: BorderSide(color: colorScheme.primary, width: 2),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          borderSide: BorderSide(color: colorScheme.error),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          borderSide: BorderSide(color: colorScheme.error, width: 2),
        ),
        labelStyle: textTheme.labelMedium,
        hintStyle: textTheme.bodyMedium?.copyWith(
          color: colorScheme.onSurface.withValues(alpha: 0.5),
        ),
      ),

      // Elevated button theme
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: AppColors.success,
          foregroundColor: Colors.white,
          elevation: 0,
          padding: const EdgeInsets.symmetric(
            horizontal: AppSpacing.lg,
            vertical: AppSpacing.md,
          ),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          ),
          textStyle: textTheme.labelLarge,
        ),
      ),

      // Outlined button theme
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          foregroundColor: colorScheme.primary,
          side: BorderSide(color: colorScheme.outline),
          padding: const EdgeInsets.symmetric(
            horizontal: AppSpacing.lg,
            vertical: AppSpacing.md,
          ),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
          ),
          textStyle: textTheme.labelLarge,
        ),
      ),

      // Text button theme
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: colorScheme.primary,
          padding: const EdgeInsets.symmetric(
            horizontal: AppSpacing.md,
            vertical: AppSpacing.sm,
          ),
          textStyle: textTheme.labelLarge,
        ),
      ),

      // FAB theme
      floatingActionButtonTheme: FloatingActionButtonThemeData(
        backgroundColor: AppColors.success,
        foregroundColor: Colors.white,
        elevation: 4,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppSpacing.radiusMedium),
        ),
      ),

      // Bottom navigation bar theme
      bottomNavigationBarTheme: BottomNavigationBarThemeData(
        backgroundColor: AppColors.surface,
        selectedItemColor: colorScheme.primary,
        unselectedItemColor: colorScheme.onSurface.withValues(alpha: 0.6),
        selectedLabelStyle: textTheme.labelSmall,
        unselectedLabelStyle: textTheme.labelSmall,
        type: BottomNavigationBarType.fixed,
        elevation: 0,
      ),

      // Icon theme
      iconTheme: IconThemeData(color: colorScheme.onSurface, size: 24),

      // Divider theme
      dividerTheme: DividerThemeData(
        color: colorScheme.outline,
        thickness: 1,
        space: 1,
      ),
    );
  }

  // Placeholder for dark theme
  static ThemeData darkTheme() {
    return lightTheme(); // TODO: Implement dark theme in future
  }

  AppTheme._();
}