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

/// Authoritative Material 3 theme definitions for MotorSignal.
class AppTheme {
  /// Dark Theme (Cockpit OLED).
  static ThemeData get darkTheme {
    const colorScheme = ColorScheme.dark(
      primary: AppColors.darkPrimary,
      onPrimary: AppColors.onBrand,
      primaryContainer: AppColors.brandContainerDark,
      onPrimaryContainer: AppColors.onBrandContainerDark,
      secondary: AppColors.darkSecondary,
      onSecondary: Color(0xFFFFFFFF),
      secondaryContainer: Color(0xFF311414),
      onSecondaryContainer: Color(0xFFFFDAD6),
      surface: AppColors.darkSurface,
      onSurface: AppColors.darkOnSurface,
      onSurfaceVariant: AppColors.darkOnSurfaceVariant,
      outline: AppColors.darkOutline,
      outlineVariant: AppColors.darkOutlineVariant,
      error: AppColors.semanticDanger,
      onError: Color(0xFFFFFFFF),
    );

    return ThemeData(
      useMaterial3: true,
      brightness: Brightness.dark,
      colorScheme: colorScheme,
      scaffoldBackgroundColor: AppColors.darkBackground,
      fontFamily: AppTypography.fontBody,
      extensions: const [
        MotorSignalThemeColors.dark,
      ],
      appBarTheme: const AppBarTheme(
        backgroundColor: Colors.transparent,
        elevation: 0,
        centerTitle: true,
        scrolledUnderElevation: 0,
        titleTextStyle: TextStyle(
          fontFamily: AppTypography.fontHeadline,
          fontSize: 15,
          fontWeight: FontWeight.w700,
          color: AppColors.darkOnSurface,
        ),
        iconTheme: IconThemeData(color: AppColors.darkOnSurface),
        actionsIconTheme: IconThemeData(color: AppColors.darkOnSurface),
        systemOverlayStyle: SystemUiOverlayStyle.light,
      ),
      cardTheme: CardThemeData(
        color: AppColors.darkSurfaceContainer,
        elevation: 0,
        margin: EdgeInsets.zero,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.lgBorderRadius,
          side: const BorderSide(color: AppColors.darkOutlineVariant, width: 0.8),
        ),
      ),
      dialogTheme: DialogThemeData(
        backgroundColor: AppColors.darkSurfaceContainerHigh,
        elevation: 6,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.lgBorderRadius,
          side: const BorderSide(color: AppColors.darkOutlineVariant, width: 0.8),
        ),
        titleTextStyle: AppTypography.headlineMd.copyWith(color: AppColors.darkOnSurface),
        contentTextStyle: AppTypography.bodyMd.copyWith(color: AppColors.darkOnSurfaceVariant),
      ),
      bottomSheetTheme: BottomSheetThemeData(
        backgroundColor: AppColors.darkSurfaceContainerHigh,
        modalBackgroundColor: AppColors.darkSurfaceContainerHigh,
        elevation: 12,
        shape: const RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(AppRadius.xl)),
        ),
      ),
      segmentedButtonTheme: SegmentedButtonThemeData(
        style: ButtonStyle(
          visualDensity: VisualDensity.compact,
          tapTargetSize: MaterialTapTargetSize.shrinkWrap,
          shape: WidgetStateProperty.all(
            RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          ),
          side: WidgetStateProperty.resolveWith<BorderSide>((states) {
            if (states.contains(WidgetState.selected)) {
              return const BorderSide(color: AppColors.darkPrimary, width: 1.2);
            }
            return const BorderSide(color: AppColors.darkOutlineVariant, width: 0.8);
          }),
          backgroundColor: WidgetStateProperty.resolveWith<Color?>((states) {
            if (states.contains(WidgetState.selected)) {
              return AppColors.darkPrimary.withValues(alpha: 0.12);
            }
            return AppColors.darkSurfaceContainer;
          }),
          foregroundColor: WidgetStateProperty.resolveWith<Color?>((states) {
            if (states.contains(WidgetState.selected)) {
              return AppColors.darkPrimary;
            }
            return AppColors.darkOnSurfaceVariant;
          }),
          textStyle: WidgetStateProperty.all(AppTypography.button),
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          backgroundColor: AppColors.darkPrimary,
          foregroundColor: const Color(0xFF0D0F13),
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          shape: RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          textStyle: AppTypography.button,
        ),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: AppColors.darkSurfaceContainerHigh,
          foregroundColor: AppColors.darkOnSurface,
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          shape: RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          textStyle: AppTypography.button,
          elevation: 1,
        ),
      ),
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          foregroundColor: AppColors.darkPrimary,
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          side: const BorderSide(color: AppColors.darkOutline, width: 1),
          shape: RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          textStyle: AppTypography.button,
        ),
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: AppColors.darkPrimary,
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          textStyle: AppTypography.button,
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: AppColors.darkSurfaceContainer,
        contentPadding: const EdgeInsets.symmetric(
          horizontal: AppSpacing.lg,
          vertical: AppSpacing.md,
        ),
        border: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.darkOutline, width: 1),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.darkOutline, width: 1),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.cyberCyan, width: 1.5),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.hazardRed, width: 1.5),
        ),
        labelStyle: AppTypography.bodyMd.copyWith(color: AppColors.darkOnSurfaceVariant),
        hintStyle: AppTypography.bodyMd.copyWith(color: AppColors.darkOnSurfaceVariant.withValues(alpha: 0.6)),
      ),
      chipTheme: ChipThemeData(
        backgroundColor: AppColors.darkSurfaceContainer,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.mdBorderRadius,
          side: const BorderSide(color: AppColors.darkOutline, width: 1),
        ),
        labelStyle: AppTypography.badgeLabel.copyWith(color: AppColors.darkOnSurface),
        padding: const EdgeInsets.symmetric(horizontal: AppSpacing.sm, vertical: AppSpacing.xs),
      ),
      dividerTheme: const DividerThemeData(
        color: AppColors.darkOutline,
        thickness: 1,
        space: 1,
      ),
      navigationBarTheme: NavigationBarThemeData(
        backgroundColor: AppColors.darkSurface,
        indicatorColor: AppColors.darkPrimary.withValues(alpha: 0.14),
        elevation: 0,
        labelTextStyle: WidgetStateProperty.resolveWith((states) {
          if (states.contains(WidgetState.selected)) {
            return AppTypography.telemetryLabel.copyWith(color: AppColors.darkPrimary);
          }
          return AppTypography.telemetryLabel.copyWith(color: AppColors.darkOnSurfaceVariant);
        }),
      ),
      navigationRailTheme: NavigationRailThemeData(
        backgroundColor: AppColors.darkSurface,
        indicatorColor: AppColors.darkPrimary.withValues(alpha: 0.14),
        elevation: 0,
        selectedLabelTextStyle: AppTypography.telemetryLabel.copyWith(color: AppColors.darkPrimary),
        unselectedLabelTextStyle: AppTypography.telemetryLabel.copyWith(color: AppColors.darkOnSurfaceVariant),
      ),
      snackBarTheme: SnackBarThemeData(
        backgroundColor: AppColors.darkSurfaceContainerHighest,
        contentTextStyle: AppTypography.bodyMd.copyWith(color: AppColors.darkOnSurface),
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.mdBorderRadius,
          side: const BorderSide(color: AppColors.darkOutlineVariant, width: 0.8),
        ),
        behavior: SnackBarBehavior.floating,
      ),
    );
  }

  /// Light Theme (Daylight HUD).
  static ThemeData get lightTheme {
    const colorScheme = ColorScheme.light(
      primary: AppColors.lightPrimary,
      onPrimary: AppColors.onBrand,
      primaryContainer: AppColors.brandContainerLight,
      onPrimaryContainer: AppColors.onBrandContainerLight,
      secondary: AppColors.lightSecondary,
      onSecondary: Color(0xFFFFFFFF),
      secondaryContainer: Color(0xFFFDE8E8),
      onSecondaryContainer: Color(0xFF410002),
      surface: AppColors.lightSurface,
      onSurface: AppColors.lightOnSurface,
      onSurfaceVariant: AppColors.lightOnSurfaceVariant,
      outline: AppColors.lightOutline,
      outlineVariant: AppColors.lightOutlineVariant,
      error: AppColors.semanticDanger,
      onError: Color(0xFFFFFFFF),
    );

    return ThemeData(
      useMaterial3: true,
      brightness: Brightness.light,
      colorScheme: colorScheme,
      scaffoldBackgroundColor: AppColors.lightBackground,
      fontFamily: AppTypography.fontBody,
      extensions: const [
        MotorSignalThemeColors.light,
      ],
      appBarTheme: const AppBarTheme(
        backgroundColor: Colors.transparent,
        elevation: 0,
        centerTitle: true,
        scrolledUnderElevation: 0,
        titleTextStyle: TextStyle(
          fontFamily: AppTypography.fontHeadline,
          fontSize: 15,
          fontWeight: FontWeight.w700,
          color: AppColors.lightOnSurface,
        ),
        iconTheme: IconThemeData(color: AppColors.lightOnSurface),
        actionsIconTheme: IconThemeData(color: AppColors.lightOnSurface),
        systemOverlayStyle: SystemUiOverlayStyle.dark,
      ),
      cardTheme: CardThemeData(
        color: AppColors.lightSurfaceContainer,
        elevation: 0,
        margin: EdgeInsets.zero,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.lgBorderRadius,
          side: const BorderSide(color: AppColors.lightOutlineVariant, width: 0.8),
        ),
      ),
      dialogTheme: DialogThemeData(
        backgroundColor: AppColors.lightSurfaceContainer,
        elevation: 6,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.lgBorderRadius,
          side: const BorderSide(color: AppColors.lightOutlineVariant, width: 0.8),
        ),
        titleTextStyle: AppTypography.headlineMd.copyWith(color: AppColors.lightOnSurface),
        contentTextStyle: AppTypography.bodyMd.copyWith(color: AppColors.lightOnSurfaceVariant),
      ),
      bottomSheetTheme: BottomSheetThemeData(
        backgroundColor: AppColors.lightSurfaceContainer,
        modalBackgroundColor: AppColors.lightSurfaceContainer,
        elevation: 12,
        shape: const RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(AppRadius.xl)),
        ),
      ),
      segmentedButtonTheme: SegmentedButtonThemeData(
        style: ButtonStyle(
          visualDensity: VisualDensity.compact,
          tapTargetSize: MaterialTapTargetSize.shrinkWrap,
          shape: WidgetStateProperty.all(
            RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          ),
          side: WidgetStateProperty.resolveWith<BorderSide>((states) {
            if (states.contains(WidgetState.selected)) {
              return const BorderSide(color: AppColors.lightPrimary, width: 1.2);
            }
            return const BorderSide(color: AppColors.lightOutlineVariant, width: 0.8);
          }),
          backgroundColor: WidgetStateProperty.resolveWith<Color?>((states) {
            if (states.contains(WidgetState.selected)) {
              return AppColors.lightPrimary.withValues(alpha: 0.10);
            }
            return AppColors.lightSurfaceContainer;
          }),
          foregroundColor: WidgetStateProperty.resolveWith<Color?>((states) {
            if (states.contains(WidgetState.selected)) {
              return AppColors.lightPrimary;
            }
            return AppColors.lightOnSurfaceVariant;
          }),
          textStyle: WidgetStateProperty.all(AppTypography.button),
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          backgroundColor: AppColors.lightPrimary,
          foregroundColor: const Color(0xFFFFFFFF),
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          shape: RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          textStyle: AppTypography.button,
        ),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: AppColors.lightSurfaceContainer,
          foregroundColor: AppColors.lightOnSurface,
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          shape: RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          textStyle: AppTypography.button,
          elevation: 1,
        ),
      ),
      outlinedButtonTheme: OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
          foregroundColor: AppColors.lightPrimary,
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          side: const BorderSide(color: AppColors.lightOutline, width: 1),
          shape: RoundedRectangleBorder(borderRadius: AppRadius.mdBorderRadius),
          textStyle: AppTypography.button,
        ),
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: AppColors.lightPrimary,
          minimumSize: const Size(AppSpacing.minTouchTarget, AppSpacing.minTouchTarget),
          textStyle: AppTypography.button,
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: AppColors.lightSurfaceContainer,
        contentPadding: const EdgeInsets.symmetric(
          horizontal: AppSpacing.lg,
          vertical: AppSpacing.md,
        ),
        border: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.lightOutline, width: 1),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.lightOutline, width: 1),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.lightPrimary, width: 1.5),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: AppRadius.mdBorderRadius,
          borderSide: const BorderSide(color: AppColors.hazardRed, width: 1.5),
        ),
        labelStyle: AppTypography.bodyMd.copyWith(color: AppColors.lightOnSurfaceVariant),
        hintStyle: AppTypography.bodyMd.copyWith(color: AppColors.lightOnSurfaceVariant.withValues(alpha: 0.6)),
      ),
      chipTheme: ChipThemeData(
        backgroundColor: AppColors.lightSurfaceContainerHigh,
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.mdBorderRadius,
          side: const BorderSide(color: AppColors.lightOutline, width: 1),
        ),
        labelStyle: AppTypography.badgeLabel.copyWith(color: AppColors.lightOnSurface),
        padding: const EdgeInsets.symmetric(horizontal: AppSpacing.sm, vertical: AppSpacing.xs),
      ),
      dividerTheme: const DividerThemeData(
        color: AppColors.lightOutlineVariant,
        thickness: 1,
        space: 1,
      ),
      navigationBarTheme: NavigationBarThemeData(
        backgroundColor: AppColors.lightSurface,
        indicatorColor: AppColors.lightPrimary.withValues(alpha: 0.12),
        elevation: 0,
        labelTextStyle: WidgetStateProperty.resolveWith((states) {
          if (states.contains(WidgetState.selected)) {
            return AppTypography.telemetryLabel.copyWith(color: AppColors.lightPrimary);
          }
          return AppTypography.telemetryLabel.copyWith(color: AppColors.lightOnSurfaceVariant);
        }),
      ),
      navigationRailTheme: NavigationRailThemeData(
        backgroundColor: AppColors.lightSurface,
        indicatorColor: AppColors.lightPrimary.withValues(alpha: 0.12),
        elevation: 0,
        selectedLabelTextStyle: AppTypography.telemetryLabel.copyWith(color: AppColors.lightPrimary),
        unselectedLabelTextStyle: AppTypography.telemetryLabel.copyWith(color: AppColors.lightOnSurfaceVariant),
      ),
      snackBarTheme: SnackBarThemeData(
        backgroundColor: AppColors.lightSurfaceContainerHighest,
        contentTextStyle: AppTypography.bodyMd.copyWith(color: AppColors.lightOnSurface),
        shape: RoundedRectangleBorder(
          borderRadius: AppRadius.mdBorderRadius,
          side: const BorderSide(color: AppColors.lightOutline, width: 1),
        ),
        behavior: SnackBarBehavior.floating,
      ),
    );
  }
}