/**
 * Metadata args utility functions.
 */
export class MetadataUtils {
	/**
	 * Gets given's entity all inherited classes.
	 * Gives in order from parents to children.
	 * For example Post extends ContentModel which extends Unit it will give
	 * [Unit, ContentModel, Post]
	 */
	static getInheritanceTree(entity: Function): Function[] {
		const tree: Function[] = [entity];
		const getPrototypeOf = (object: Function): void => {
			const proto = Object.getPrototypeOf(object);
			if (proto && proto.name) {
				tree.push(proto);
				getPrototypeOf(proto);
			}
		};
		getPrototypeOf(entity);
		return tree;
	}

	/**
	 * Checks if this table is inherited from another table.
	 */
	static isInherited(target1: Function, target2: Function) {
		return target1.prototype instanceof target2;
	}

	/**
	 * Filters given array of targets by a given classes.
	 * If classes are not given, then it returns array itself.
	 */
	static filterByTarget<T extends { target?: any }>(array: T[], classes?: any[]): T[] {
		if (!classes) return array;
		return array.filter((item) => item.target && classes.indexOf(item.target) !== -1);
	}
}