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

/// Extract a lively accent color from album art, mirroring Ratune's
/// art-driven `dynamic` theme (`color.rs`): pick the most vibrant swatch, then
/// nudge it into a readable lightness/saturation band. Ratune does the boost in
/// OKLab; this HSL approximation is close enough for now (OKLab is a later
/// refinement noted in the roadmap).
Future<Color?> extractAccent(ImageProvider image) async {
  final palette = await PaletteGenerator.fromImageProvider(
    image,
    size: const Size(200, 200),
    maximumColorCount: 8,
  );

  final picked = palette.vibrantColor?.color ??
      palette.lightVibrantColor?.color ??
      palette.dominantColor?.color;
  if (picked == null) return null;
  return _ensureReadable(picked);
}

Color _ensureReadable(Color c) {
  final hsl = HSLColor.fromColor(c);
  // Keep it bright enough to read on near-black, saturated enough to feel alive.
  final lightness = hsl.lightness.clamp(0.45, 0.70);
  final saturation = hsl.saturation < 0.40 ? 0.55 : hsl.saturation;
  return hsl.withLightness(lightness).withSaturation(saturation).toColor();
}