/**
 * Copyright © Volker Schukai and all contributing authors, {{copyRightYear}}. All rights reserved.
 * Node module: @schukai/monster
 *
 * This source code is licensed under the GNU Affero General Public License version 3 (AGPLv3).
 * The full text of the license can be found at: https://www.gnu.org/licenses/agpl-3.0.en.html
 *
 * For those who do not wish to adhere to the AGPLv3, a commercial license is available.
 * Acquiring a commercial license allows you to use this software without complying with the AGPLv3 terms.
 * For more information about purchasing a commercial license, please contact Volker Schukai.
 *
 * SPDX-License-Identifier: AGPL-3.0
 */

import { instanceSymbol } from "../../../constants.mjs";
import {
	CustomElement,
	registerCustomElement,
} from "../../../dom/customelement.mjs";
import { ThreadMessageStyleSheet } from "../stylesheet/thread-message.mjs";

export { ThreadMessage };

/**
 * The ThreadMessage component encapsulates a message in a shadow root
 * to prevent list styling from the thread control from leaking in.
 *
 * @summary Isolated message content for thread entries.
 */
class ThreadMessage extends CustomElement {
	/**
	 * This method is called by the `instanceof` operator.
	 * @return {symbol}
	 */
	static get [instanceSymbol]() {
		return Symbol.for(
			"@schukai/monster/components/state/thread-message@@instance",
		);
	}

	/**
	 * @return {object}
	 */
	get defaults() {
		return Object.assign({}, super.defaults, {
			content: "",
			templates: {
				main: getTemplate(),
			},
		});
	}

	/**
	 * @return {string}
	 */
	static getTag() {
		return "monster-thread-message";
	}

	/**
	 * @return {CSSStyleSheet[]}
	 */
	static getCSSStyleSheet() {
		return [ThreadMessageStyleSheet];
	}
}

/**
 * @private
 * @return {string}
 */
function getTemplate() {
	// language=HTML
	return `
        <div data-monster-role="content" part="content"
             data-monster-replace="path:content"></div>
    `;
}

registerCustomElement(ThreadMessage);
