import 'dart:io';

import 'package:flutter/material.dart';

/// Shared shadow for overlay controls and text on top of video content.
const kOverlayShadow = [
  Shadow(
    offset: Offset(0, 1),
    blurRadius: 4,
    color: Color.fromRGBO(0, 0, 0, 0.3),
  ),
];

/// App-specific semantic colors that extend Material's [ColorScheme].
///
/// Colors that map to Material 3 roles use [ColorScheme] directly:
/// - Links → [ColorScheme.primary]
/// - Mentions → [ColorScheme.error]
/// - First-time chatters → [ColorScheme.tertiary]
///
/// Access via `Theme.of(context).extension<FrostyColors>()!` or the
/// `context.frostyColors` convenience extension.
class FrostyColors extends ThemeExtension<FrostyColors> {
  final Color highlightedMessage;
  final Color emoteOnly;
  final Color followersOnly;
  final Color slowMode;
  final Color subOnly;
  final Color uniqueMode;
  final Color overlayOnSurface;

  const FrostyColors({
    required this.highlightedMessage,
    required this.emoteOnly,
    required this.followersOnly,
    required this.slowMode,
    required this.subOnly,
    required this.uniqueMode,
    required this.overlayOnSurface,
  });

  static FrostyColors light({required ColorScheme colorScheme}) => FrostyColors(
    highlightedMessage: colorScheme.primary,
    emoteOnly: const Color(0xFFFFB74D),
    followersOnly: const Color(0xFFF44336),
    slowMode: const Color(0xFF2196F3),
    subOnly: const Color(0xFF4CAF50),
    uniqueMode: const Color(0xFFAB47BC),
    overlayOnSurface: Colors.white,
  );

  static FrostyColors dark({required ColorScheme colorScheme}) => FrostyColors(
    highlightedMessage: colorScheme.primary,
    emoteOnly: const Color(0xFFFFCC80),
    followersOnly: const Color(0xFFE57373),
    slowMode: const Color(0xFF64B5F6),
    subOnly: const Color(0xFF81C784),
    uniqueMode: const Color(0xFFBA68C8),
    overlayOnSurface: Colors.white,
  );

  @override
  FrostyColors copyWith({
    Color? highlightedMessage,
    Color? emoteOnly,
    Color? followersOnly,
    Color? slowMode,
    Color? subOnly,
    Color? uniqueMode,
    Color? overlayOnSurface,
  }) {
    return FrostyColors(
      highlightedMessage: highlightedMessage ?? this.highlightedMessage,
      emoteOnly: emoteOnly ?? this.emoteOnly,
      followersOnly: followersOnly ?? this.followersOnly,
      slowMode: slowMode ?? this.slowMode,
      subOnly: subOnly ?? this.subOnly,
      uniqueMode: uniqueMode ?? this.uniqueMode,
      overlayOnSurface: overlayOnSurface ?? this.overlayOnSurface,
    );
  }

  @override
  FrostyColors lerp(FrostyColors? other, double t) {
    if (other is! FrostyColors) return this;
    return FrostyColors(
      highlightedMessage: Color.lerp(highlightedMessage, other.highlightedMessage, t)!,
      emoteOnly: Color.lerp(emoteOnly, other.emoteOnly, t)!,
      followersOnly: Color.lerp(followersOnly, other.followersOnly, t)!,
      slowMode: Color.lerp(slowMode, other.slowMode, t)!,
      subOnly: Color.lerp(subOnly, other.subOnly, t)!,
      uniqueMode: Color.lerp(uniqueMode, other.uniqueMode, t)!,
      overlayOnSurface: Color.lerp(overlayOnSurface, other.overlayOnSurface, t)!,
    );
  }
}

class FrostyThemes {
  final Color colorSchemeSeed;

  const FrostyThemes({required this.colorSchemeSeed});

  ThemeData get light => createBaseTheme(
    colorScheme: ColorScheme.fromSeed(seedColor: colorSchemeSeed),
    backgroundColor: const Color.fromRGBO(248, 248, 248, 1),
  );

  ThemeData get dark => createBaseTheme(
    colorScheme: ColorScheme.fromSeed(
      seedColor: colorSchemeSeed,
      brightness: Brightness.dark,
    ),
    backgroundColor: Colors.black,
  );

  ThemeData createBaseTheme({
    required ColorScheme colorScheme,
    Color? backgroundColor,
  }) {
    final borderColor = colorScheme.outlineVariant.withValues(alpha: 0.5);

    const borderWidth = 0.5;

    return ThemeData(
      extensions: [
        colorScheme.brightness == Brightness.dark
            ? FrostyColors.dark(colorScheme: colorScheme)
            : FrostyColors.light(colorScheme: colorScheme),
      ],
      colorScheme: colorScheme,
      fontFamily: 'Inter',
      splashFactory: Platform.isIOS ? NoSplash.splashFactory : null,
      textSelectionTheme: TextSelectionThemeData(
        cursorColor: colorScheme.primary,
        selectionColor: colorScheme.primary.withValues(alpha: 0.3),
        selectionHandleColor: colorScheme.primary,
      ),
      scaffoldBackgroundColor: backgroundColor,
      bottomSheetTheme: BottomSheetThemeData(
        showDragHandle: true,
        backgroundColor: backgroundColor,
        surfaceTintColor: backgroundColor,
      ),
      menuTheme: MenuThemeData(
        style: MenuStyle(
          padding: const WidgetStatePropertyAll(
            EdgeInsets.symmetric(vertical: 2),
          ),
          shape: WidgetStatePropertyAll(
            RoundedRectangleBorder(
              borderRadius: const BorderRadius.all(Radius.circular(12)),
              side: BorderSide(color: borderColor),
            ),
          ),
        ),
      ),
      menuButtonTheme: MenuButtonThemeData(
        style: MenuItemButton.styleFrom(
          visualDensity: VisualDensity.compact,
          minimumSize: const Size(0, 40),
          padding: const EdgeInsets.symmetric(horizontal: 12),
          tapTargetSize: MaterialTapTargetSize.shrinkWrap,
        ),
      ),
      dialogTheme: DialogThemeData(
        backgroundColor: backgroundColor,
        surfaceTintColor: backgroundColor,
        shape: RoundedRectangleBorder(
          borderRadius: const BorderRadius.all(Radius.circular(16)),
          side: BorderSide(color: borderColor),
        ),
      ),
      appBarTheme: AppBarTheme(
        elevation: 0,
        backgroundColor: backgroundColor,
        surfaceTintColor: backgroundColor,
        titleSpacing: 0,
      ),
      inputDecorationTheme: InputDecorationTheme(
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
        filled: true,
        fillColor: colorScheme.surfaceContainerHighest.withValues(alpha: 0.6),
        hintStyle: TextStyle(
          color: colorScheme.onSurfaceVariant,
          fontWeight: FontWeight.normal,
        ),
        border: OutlineInputBorder(
          borderRadius: const BorderRadius.all(Radius.circular(100)),
          borderSide: BorderSide.none,
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: const BorderRadius.all(Radius.circular(100)),
          borderSide: BorderSide.none,
        ),
        disabledBorder: OutlineInputBorder(
          borderRadius: const BorderRadius.all(Radius.circular(100)),
          borderSide: BorderSide.none,
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: const BorderRadius.all(Radius.circular(100)),
          borderSide: BorderSide(
            color: colorScheme.primary.withValues(alpha: 0.8),
            width: 1.5,
          ),
        ),
      ),
      listTileTheme: ListTileThemeData(
        titleTextStyle: TextStyle(
          color: colorScheme.onSurface,
          fontSize: 15,
          fontWeight: FontWeight.w500,
          letterSpacing: -0.011,
          height: 1.5,
        ),
        subtitleTextStyle: TextStyle(
          color: colorScheme.onSurfaceVariant.withValues(alpha: 0.7),
          fontSize: 13,
          height: 1.4,
        ),
        leadingAndTrailingTextStyle: TextStyle(
          color: colorScheme.onSurfaceVariant.withValues(alpha: 0.6),
        ),
      ),
      navigationBarTheme: NavigationBarThemeData(
        elevation: 0,
        backgroundColor: backgroundColor,
        height: 64,
        labelBehavior: NavigationDestinationLabelBehavior.alwaysHide,
        indicatorColor: Colors.transparent,
        indicatorShape: const CircleBorder(),
        overlayColor: const WidgetStatePropertyAll(Colors.transparent),
      ),
      tabBarTheme: const TabBarThemeData(
        dividerColor: Colors.transparent,
        tabAlignment: TabAlignment.start,
      ),
      tooltipTheme: TooltipThemeData(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        showDuration: const Duration(seconds: 2),
        decoration: BoxDecoration(
          color: colorScheme.surface,
          borderRadius: const BorderRadius.all(Radius.circular(12)),
          border: Border.all(color: borderColor),
        ),
        textStyle: TextStyle(color: colorScheme.onSurface),
      ),
      snackBarTheme: SnackBarThemeData(
        showCloseIcon: true,
        backgroundColor: backgroundColor,
        shape: RoundedRectangleBorder(
          side: BorderSide(color: borderColor),
          borderRadius: const BorderRadius.all(Radius.circular(12)),
        ),
        behavior: SnackBarBehavior.floating,
      ),
      dividerTheme: DividerThemeData(
        thickness: borderWidth,
        space: borderWidth,
        color: borderColor,
      ),
      textTheme: TextTheme(
        // Alert dialog title
        headlineSmall: TextStyle(
          fontSize: 18,
          fontWeight: FontWeight.w600,
          letterSpacing: -0.019,
        ),

        // App bar title
        titleLarge: TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.w600,
          letterSpacing: -0.019,
        ),

        // Section titles
        titleMedium: TextStyle(
          fontWeight: FontWeight.w600,
          letterSpacing: -0.011,
        ),

        // Tab bar title
        titleSmall: TextStyle(
          fontSize: 16,
          fontWeight: FontWeight.w600,
          letterSpacing: -0.011,
        ),

        // Labels
        labelLarge: TextStyle(
          fontWeight: FontWeight.w500,
          letterSpacing: -0.006,
        ),
        labelMedium: TextStyle(fontWeight: FontWeight.w500, letterSpacing: 0),
        labelSmall: TextStyle(
          fontWeight: FontWeight.w500,
          letterSpacing: 0.005,
        ),

        // Body text
        bodyLarge: TextStyle(
          fontWeight: FontWeight.w500,
          letterSpacing: -0.011,
        ),
        bodyMedium: TextStyle(letterSpacing: -0.006),
        bodySmall: TextStyle(letterSpacing: 0),
      ),
    );
  }
}