/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ---------------------------------------------------------------------
 *
 * Portions of this file were modified and ported to Vala by Victor Vintorez in 2026.
 * These modifications are licensed under the European Union Public License (EUPL),
 * Version 1.2 or later. You may obtain a copy of the License at:
 * https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12
 */

using GLib;

namespace MaterialColorUtilities {
	/**
	 * Check and/or fix universally disliked colors.
	 *
	 * <p>Color science studies of color preference indicate universal distaste for dark yellow-greens,
	 * and also show this is correlated to distate for biological waste and rotting food.
	 *
	 * <p>See Palmer and Schloss, 2010 or Schloss and Palmer's Chapter 21 in Handbook of Color
	 * Psychology (2015).
	 */
	public sealed class DislikeAnalyzer : Object {
		private DislikeAnalyzer() {}

		/**
		 * Returns true if color is disliked.
		 *
		 * <p>Disliked is defined as a dark yellow-green that is not neutral.
		 */
		public static bool is_disliked(Hct hct) {
			bool hue_passes = Math.round(hct.hue) >= 90.0 && Math.round(hct.hue) <= 111.0;
			bool chroma_passes = Math.round(hct.chroma) > 16.0;
			bool tone_passes = Math.round(hct.tone) < 65.0;

			return hue_passes && chroma_passes && tone_passes;
		}

		/** If color is disliked, lighten it to make it likable. */
		public static Hct fix_if_disliked(Hct hct) {
			if (is_disliked(hct)) {
				return Hct.from(hct.hue, hct.chroma, 70.0);
			}

			return hct;
		}
	}
}
