the-mews/app/lib/presentation/reader/palettes.dart

import 'package:flutter/material.dart';

import '../../mews/document.dart';

/// The client's own presentation, mirroring the palettes of the default
/// stylesheet mews-0.1.css (spec 5.1). Mews clients ignore author CSS and use
/// their own, so these colors are the single visual source for page content.
class MewsPalette {
  const MewsPalette({
    required this.background,
    required this.foreground,
    required this.link,
    required this.visited,
    required this.border,
    required this.preBackground,
  });

  final Color background;
  final Color foreground;
  final Color link;
  final Color visited;
  final Color border;
  final Color preBackground;
}

const _plainLight = MewsPalette(
  background: Color(0xfffaf8f3),
  foreground: Color(0xff1f1f1f),
  link: Color(0xff1a4f9c),
  visited: Color(0xff5b2a86),
  border: Color(0xffc9c4b8),
  preBackground: Color(0xffefece4),
);

const _plainDark = MewsPalette(
  background: Color(0xff18191b),
  foreground: Color(0xffe3e1dc),
  link: Color(0xff8fb8f5),
  visited: Color(0xffc9a3f2),
  border: Color(0xff45464a),
  preBackground: Color(0xff222326),
);

const _warmLight = MewsPalette(
  background: Color(0xfffbf4e8),
  foreground: Color(0xff2a2420),
  link: Color(0xff8a3d14),
  visited: Color(0xff5b2a86),
  border: Color(0xffc9c4b8),
  preBackground: Color(0xffefece4),
);

const _warmDark = MewsPalette(
  background: Color(0xff1d1916),
  foreground: Color(0xffe8dfd3),
  link: Color(0xfff0b48a),
  visited: Color(0xffc9a3f2),
  border: Color(0xff45464a),
  preBackground: Color(0xff222326),
);

const _coolLight = MewsPalette(
  background: Color(0xfff3f6fa),
  foreground: Color(0xff1c2430),
  link: Color(0xff1a4f9c),
  visited: Color(0xff5b2a86),
  border: Color(0xffc9c4b8),
  preBackground: Color(0xffefece4),
);

const _coolDark = MewsPalette(
  background: Color(0xff161a20),
  foreground: Color(0xffdde4ee),
  link: Color(0xff8fb8f5),
  visited: Color(0xffc9a3f2),
  border: Color(0xff45464a),
  preBackground: Color(0xff222326),
);

const _greenLight = MewsPalette(
  background: Color(0xfff2f6ef),
  foreground: Color(0xff1f2a1f),
  link: Color(0xff24502a),
  visited: Color(0xff5b2a86),
  border: Color(0xffc9c4b8),
  preBackground: Color(0xffefece4),
);

const _greenDark = MewsPalette(
  background: Color(0xff161b16),
  foreground: Color(0xffdbe6d8),
  link: Color(0xff9fd39a),
  visited: Color(0xffc9a3f2),
  border: Color(0xff45464a),
  preBackground: Color(0xff222326),
);

const _monoLight = MewsPalette(
  background: Color(0xffe8ebe1),
  foreground: Color(0xff1e2219),
  link: Color(0xff1e2219),
  visited: Color(0xff5b2a86),
  border: Color(0xffc9c4b8),
  preBackground: Color(0xffefece4),
);

const _monoDark = MewsPalette(
  background: Color(0xff1b1d18),
  foreground: Color(0xffc8d0b8),
  link: Color(0xffc8d0b8),
  visited: Color(0xffc9a3f2),
  border: Color(0xff45464a),
  preBackground: Color(0xff222326),
);

/// Resolves the palette: the reader's variant choice overrides the page's own
/// variant unless the choice is "site" (spec 5.3, 8.2).
MewsPalette paletteFor({required MewsVariant pageVariant, required String readerVariant, required bool dark}) {
  final variant = readerVariant == 'site' ? pageVariant : pageVariantFromName(readerVariant);
  return switch ((variant, dark)) {
    (MewsVariant.warm, false) => _warmLight,
    (MewsVariant.warm, true) => _warmDark,
    (MewsVariant.cool, false) => _coolLight,
    (MewsVariant.cool, true) => _coolDark,
    (MewsVariant.green, false) => _greenLight,
    (MewsVariant.green, true) => _greenDark,
    (MewsVariant.mono, false) => _monoLight,
    (MewsVariant.mono, true) => _monoDark,
    (_, false) => _plainLight,
    (_, true) => _plainDark,
  };
}

MewsVariant pageVariantFromName(String name) => switch (name) {
      'warm' => MewsVariant.warm,
      'cool' => MewsVariant.cool,
      'green' => MewsVariant.green,
      'mono' => MewsVariant.mono,
      _ => MewsVariant.plain,
    };