import 'package:flutter/material.dart';

/// A restrained green accent, used sparingly against neutral surfaces.
const accentGreen = Color(0xff36d681);

ThemeData groundSuiteLightTheme() => _theme(
  brightness: Brightness.light,
  seed: const Color(0xff087a3b),
  surface: const Color(0xfff3f6f3),
  onSurface: const Color(0xff142019),
  outline: const Color(0xffc2cec4),
);

ThemeData groundSuiteDarkTheme() => _theme(
  brightness: Brightness.dark,
  seed: const Color(0xff36d681),
  surface: const Color(0xff080b09),
  onSurface: const Color(0xffe8f0ea),
  outline: const Color(0xff2a382e),
);

ThemeData _theme({
  required Brightness brightness,
  required Color seed,
  required Color surface,
  required Color onSurface,
  required Color outline,
}) {
  final scheme = ColorScheme.fromSeed(seedColor: seed, brightness: brightness)
      .copyWith(
        primary: seed,
        onPrimary: brightness == Brightness.dark
            ? const Color(0xff031207)
            : Colors.white,
        surface: surface,
        onSurface: onSurface,
        onSurfaceVariant: brightness == Brightness.dark
            ? const Color(0xffa8b5ac)
            : const Color(0xff546258),
        outline: outline,
        surfaceContainer: brightness == Brightness.dark
            ? const Color(0xff101712)
            : const Color(0xffeaf0eb),
      );

  return ThemeData(
    useMaterial3: true,
    colorScheme: scheme,
    scaffoldBackgroundColor: Colors.transparent,
    visualDensity: VisualDensity.standard,
    cardTheme: const CardThemeData(
      color: Colors.transparent,
      elevation: 0,
      margin: EdgeInsets.zero,
    ),
    textTheme: ThemeData(brightness: brightness).textTheme.copyWith(
      headlineMedium: TextStyle(
        color: onSurface,
        fontWeight: FontWeight.w700,
        letterSpacing: -0.6,
      ),
      titleLarge: TextStyle(color: onSurface, fontWeight: FontWeight.w700),
      titleMedium: TextStyle(color: onSurface, fontWeight: FontWeight.w600),
      bodyMedium: TextStyle(color: onSurface),
      bodySmall: TextStyle(
        color: brightness == Brightness.dark
            ? const Color(0xffa8b5ac)
            : const Color(0xff546258),
      ),
    ),
    dividerTheme: DividerThemeData(color: outline.withValues(alpha: 0.72)),
    navigationRailTheme: NavigationRailThemeData(
      backgroundColor: Colors.transparent,
      indicatorColor: seed.withValues(
        alpha: brightness == Brightness.dark ? 0.2 : 0.13,
      ),
      selectedIconTheme: IconThemeData(color: seed),
      selectedLabelTextStyle: TextStyle(
        color: seed,
        fontWeight: FontWeight.w700,
      ),
    ),
    navigationBarTheme: NavigationBarThemeData(
      backgroundColor: Colors.transparent,
      indicatorColor: seed.withValues(
        alpha: brightness == Brightness.dark ? 0.2 : 0.13,
      ),
      labelTextStyle: WidgetStatePropertyAll(
        TextStyle(color: onSurface, fontWeight: FontWeight.w600),
      ),
    ),
    chipTheme: ChipThemeData(
      backgroundColor: scheme.surfaceContainer.withValues(alpha: 0.72),
      selectedColor: seed.withValues(
        alpha: brightness == Brightness.dark ? 0.22 : 0.16,
      ),
      side: BorderSide(color: outline.withValues(alpha: 0.75)),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: scheme.surfaceContainer.withValues(alpha: 0.7),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: outline),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: outline.withValues(alpha: 0.8)),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(14),
        borderSide: BorderSide(color: seed, width: 1.5),
      ),
    ),
  );
}