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/*******************************************************************
 * © 2020 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds.reflect.impl;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Stream;

import com.sap.cds.reflect.CdsAnnotatable;
import com.sap.cds.reflect.CdsAnnotation;

public abstract class CdsAnnotatableImpl implements CdsAnnotatable {

	private final Map> annotations = new HashMap<>();

	protected CdsAnnotatableImpl(Collection> annotations) {
		annotations.forEach(a -> this.annotations.put(a.getName(), a));
	}

	@Override
	public Stream> annotations() {
		return annotations.values().stream();
	}

	@SuppressWarnings("unchecked")
	public  Optional> findAnnotation(String name) {
		return Optional.ofNullable((CdsAnnotation) annotations.get(removeAt(name)));
	}

	private static String removeAt(String name) {
		if (name.startsWith("@")) {
			name = name.substring(1);
		}
		return name;
	}

	public static class CdsAnnotationImpl implements CdsAnnotation {
		private final String name;
		private final T value;

		private CdsAnnotationImpl(String name, T value) {
			this.name = name;
			this.value = value;
		}

		public static  CdsAnnotation annotation(String name, T value) {
			return new CdsAnnotationImpl<>(removeAt(name), value);
		}

		@Override
		public String getName() {
			return name;
		}

		@Override
		public T getValue() {
			return value;
		}
	}

}