import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/tema/pluriwave_tokens.dart';

/// Design ADR-1: 3 new colour fields join the existing PluriWaveTokens
/// extension (colours belong here because they must participate in lerp).
/// Dedicated file under test/tema/ so the WU1 verify command
/// (`flutter test test/tema/ ...`) discovers it; the single pre-existing
/// PluriWaveTokens assertion inside pluriwave_foundations_test.dart is left
/// untouched.
void main() {
  group('PluriWaveTokens — redesign colours', () {
    test('dark keeps the pre-existing base palette', () {
      expect(PluriWaveTokens.dark.deepViolet, const Color(0xFF07121A));
      // S4 (Tier 1 visual fidelity): the prototype's dominant card radius
      // is 18 (t4 lines 512, 613, 715, 133) — radiusMd used to be 22, a
      // systematic +4px drift across every card that defaults to it.
      expect(PluriWaveTokens.dark.radiusMd, 18);
      expect(PluriWaveTokens.dark.spacingMd, 16);
    });

    test(
      'dark exposes listSurface and liveGreen de-literalised from theme.dart',
      () {
        // Design ADR-1: these match the theme's previous raw literals
        // (surfaceContainerLow / secondary) exactly, so promoting them to
        // named tokens keeps rendered output byte-identical.
        expect(PluriWaveTokens.dark.listSurface, const Color(0xFF102532));
        expect(PluriWaveTokens.dark.liveGreen, const Color(0xFF7EE4C2));
      },
    );

    test('dark exposes offlineAccent per the proposal (#E8879A)', () {
      expect(PluriWaveTokens.dark.offlineAccent, const Color(0xFFE8879A));
    });

    test('copyWith overrides only the new colour fields', () {
      final overridden = PluriWaveTokens.dark.copyWith(
        listSurface: Colors.black,
        liveGreen: Colors.black,
        offlineAccent: Colors.black,
      );
      expect(overridden.listSurface, Colors.black);
      expect(overridden.liveGreen, Colors.black);
      expect(overridden.offlineAccent, Colors.black);
      // Untouched fields keep their original value.
      expect(overridden.deepViolet, PluriWaveTokens.dark.deepViolet);
    });

    test('lerp interpolates listSurface, liveGreen and offlineAccent', () {
      const a = PluriWaveTokens.dark;
      final b = a.copyWith(
        listSurface: Colors.white,
        liveGreen: Colors.white,
        offlineAccent: Colors.white,
      );

      final mid = a.lerp(b, 0.5);

      expect(mid.listSurface, Color.lerp(a.listSurface, Colors.white, 0.5));
      expect(mid.liveGreen, Color.lerp(a.liveGreen, Colors.white, 0.5));
      expect(mid.offlineAccent, Color.lerp(a.offlineAccent, Colors.white, 0.5));
    });
  });
}