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

// ── Colour constants ──────────────────────────────────────────────────────────

const _darkBackground    = Color(0xFF0F0F14);
const _darkSurface       = Color(0xFF16161F);
const _darkSurfaceVar    = Color(0xFF1A1A24);
const _darkPrimary       = Color(0xFF7C3AED);
const _darkOnSurface     = Color(0xFFE4E4F0);
const _darkOnSurfaceVar  = Color(0xFF8888A8);
const _darkOutline       = Color(0xFF2A2A3A);

const _lightBackground   = Color(0xFFF5F5FB);
const _lightSurface      = Color(0xFFFFFFFF);
const _lightSurfaceVar   = Color(0xFFF0F0F8);
const _lightPrimary      = Color(0xFF7C3AED);
const _lightOnSurface    = Color(0xFF1A1A1A);
const _lightOnSurfaceVar = Color(0xFF666666);
const _lightOutline      = Color(0xFFDDDDE8);

// ── Typography ─────────────────────────────────────────────────────────────────

TextTheme _buildTextTheme(TextTheme base) {
  final fraunces = GoogleFonts.frauncesTextTheme(base);
  return base.copyWith(
    // Headings / titles use Fraunces
    headlineLarge:  fraunces.headlineLarge,
    headlineMedium: fraunces.headlineMedium,
    headlineSmall:  fraunces.headlineSmall,
    titleLarge:     fraunces.titleLarge,
    titleMedium:    fraunces.titleMedium,
    // Body / labels remain system default
  );
}

// ── Themes ─────────────────────────────────────────────────────────────────────

ThemeData fabledDarkTheme() {
  final cs = ColorScheme(
    brightness:          Brightness.dark,
    primary:             _darkPrimary,
    onPrimary:           Colors.white,
    primaryContainer:    const Color(0xFF5B21B6),
    onPrimaryContainer:  _darkOnSurface,
    secondary:           _darkPrimary,
    onSecondary:         Colors.white,
    secondaryContainer:  _darkSurfaceVar,
    onSecondaryContainer: _darkOnSurface,
    tertiary:            _darkPrimary,
    onTertiary:          Colors.white,
    tertiaryContainer:   _darkSurfaceVar,
    onTertiaryContainer: _darkOnSurface,
    error:               const Color(0xFFEF4444),
    onError:             Colors.white,
    errorContainer:      const Color(0xFF7F1D1D),
    onErrorContainer:    const Color(0xFFFEE2E2),
    surface:             _darkSurface,
    onSurface:           _darkOnSurface,
    surfaceContainerHighest: _darkSurfaceVar,
    onSurfaceVariant:    _darkOnSurfaceVar,
    outline:             _darkOutline,
    outlineVariant:      _darkOutline,
    shadow:              Colors.black,
    scrim:               Colors.black,
    inverseSurface:      _darkOnSurface,
    onInverseSurface:    _darkSurface,
    inversePrimary:      _lightPrimary,
  );

  return ThemeData(
    useMaterial3:   true,
    colorScheme:    cs,
    scaffoldBackgroundColor: _darkBackground,
    textTheme: _buildTextTheme(ThemeData.dark().textTheme),
    cardTheme: CardThemeData(
      color:         _darkSurface,
      elevation:     2,
      shadowColor:   Colors.black.withValues(alpha: 0.4),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
    ),
    navigationBarTheme: NavigationBarThemeData(
      backgroundColor: _darkSurface,
      indicatorColor:  _darkPrimary.withValues(alpha: 0.2),
    ),
    navigationRailTheme: NavigationRailThemeData(
      backgroundColor: _darkSurface,
      indicatorColor:  _darkPrimary.withValues(alpha: 0.2),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled:      true,
      fillColor:   _darkSurfaceVar,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(24),
        borderSide: BorderSide(color: _darkOutline),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(24),
        borderSide: BorderSide(color: _darkOutline),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(24),
        borderSide: BorderSide(color: _darkPrimary, width: 2),
      ),
    ),
    dividerTheme: DividerThemeData(color: _darkOutline, thickness: 1),
    chipTheme: ChipThemeData(
      backgroundColor: _darkSurfaceVar,
      labelStyle: TextStyle(color: _darkOnSurfaceVar, fontSize: 12),
      side: BorderSide(color: _darkOutline),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
    ),
  );
}

ThemeData fabledLightTheme() {
  final cs = ColorScheme(
    brightness:          Brightness.light,
    primary:             _lightPrimary,
    onPrimary:           Colors.white,
    primaryContainer:    const Color(0xFFEDE5FF),
    onPrimaryContainer:  _lightOnSurface,
    secondary:           _lightPrimary,
    onSecondary:         Colors.white,
    secondaryContainer:  _lightSurfaceVar,
    onSecondaryContainer: _lightOnSurface,
    tertiary:            _lightPrimary,
    onTertiary:          Colors.white,
    tertiaryContainer:   _lightSurfaceVar,
    onTertiaryContainer: _lightOnSurface,
    error:               const Color(0xFFDC2626),
    onError:             Colors.white,
    errorContainer:      const Color(0xFFFEE2E2),
    onErrorContainer:    const Color(0xFF7F1D1D),
    surface:             _lightSurface,
    onSurface:           _lightOnSurface,
    surfaceContainerHighest: _lightSurfaceVar,
    onSurfaceVariant:    _lightOnSurfaceVar,
    outline:             _lightOutline,
    outlineVariant:      _lightOutline,
    shadow:              Colors.black,
    scrim:               Colors.black,
    inverseSurface:      _lightOnSurface,
    onInverseSurface:    _lightSurface,
    inversePrimary:      _darkPrimary,
  );

  return ThemeData(
    useMaterial3:   true,
    colorScheme:    cs,
    scaffoldBackgroundColor: _lightBackground,
    textTheme: _buildTextTheme(ThemeData.light().textTheme),
    cardTheme: CardThemeData(
      color:         _lightSurface,
      elevation:     1,
      shadowColor:   Colors.black.withValues(alpha: 0.08),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
    ),
    navigationBarTheme: NavigationBarThemeData(
      backgroundColor: _lightSurface,
      indicatorColor:  _lightPrimary.withValues(alpha: 0.12),
    ),
    navigationRailTheme: NavigationRailThemeData(
      backgroundColor: _lightSurface,
      indicatorColor:  _lightPrimary.withValues(alpha: 0.12),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled:      true,
      fillColor:   _lightSurfaceVar,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(24),
        borderSide: BorderSide(color: _lightOutline),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(24),
        borderSide: BorderSide(color: _lightOutline),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(24),
        borderSide: BorderSide(color: _lightPrimary, width: 2),
      ),
    ),
    dividerTheme: DividerThemeData(color: _lightOutline, thickness: 1),
    chipTheme: ChipThemeData(
      backgroundColor: _lightSurfaceVar,
      labelStyle: TextStyle(color: _lightOnSurfaceVar, fontSize: 12),
      side: BorderSide(color: _lightOutline),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
    ),
  );
}

// ── GradientButton ─────────────────────────────────────────────────────────────
// Use wherever the web app uses the indigo gradient button (send, primary actions).

class GradientButton extends StatelessWidget {
  final VoidCallback? onPressed;
  final Widget child;
  final EdgeInsetsGeometry padding;

  const GradientButton({
    super.key,
    required this.onPressed,
    required this.child,
    this.padding = const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
  });

  @override
  Widget build(BuildContext context) {
    final disabled = onPressed == null;
    return AnimatedOpacity(
      opacity: disabled ? 0.45 : 1.0,
      duration: const Duration(milliseconds: 150),
      child: DecoratedBox(
        decoration: BoxDecoration(
          gradient: disabled
              ? null
              : const LinearGradient(
                  begin: Alignment.topLeft,
                  end: Alignment.bottomRight,
                  colors: [Color(0xFF7C3AED), Color(0xFF5B21B6)],
                ),
          color: disabled ? const Color(0xFF7C3AED) : null,
          borderRadius: BorderRadius.circular(12),
          boxShadow: disabled
              ? null
              : [
                  BoxShadow(
                    color: const Color(0xFF7C3AED).withValues(alpha: 0.45),
                    blurRadius: 8,
                    offset: const Offset(0, 3),
                  ),
                ],
        ),
        child: Material(
          color: Colors.transparent,
          child: InkWell(
            onTap: onPressed,
            borderRadius: BorderRadius.circular(12),
            child: Padding(padding: padding, child: child),
          ),
        ),
      ),
    );
  }
}