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/*
 * Copyright 2021-2024 spring-boot-extension the original author or authors.
 * 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
 *       https://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.
 */

package com.livk.commons.expression;

import com.google.common.collect.Maps;
import org.springframework.lang.NonNull;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * 解析器上下文
 *
 * @author livk
 */
public interface Context extends Map {

	/**
	 * Instantiates a new Context.
	 */
	static Context create() {
		return new ContextImpl();
	}

	/**
	 * Instantiates a new Context.
	 * @param map the map
	 */
	static Context create(Map map) {
		return new ContextImpl(map);
	}

	/**
	 * Put all.
	 * @param m the m
	 * @param override the override
	 */
	void putAll(Map m, boolean override);

	/**
	 * Put object.
	 * @param key the key
	 * @param value the value
	 * @param override the override
	 * @return the object
	 */
	Object put(String key, Object value, boolean override);

	class ContextImpl implements Context {

		private final Map variables;

		private ContextImpl() {
			variables = new HashMap<>();
		}

		private ContextImpl(Map map) {
			variables = Maps.newHashMap(map);
		}

		@Override
		public int size() {
			return variables.size();
		}

		@Override
		public boolean isEmpty() {
			return variables.isEmpty();
		}

		@Override
		public boolean containsKey(Object key) {
			return variables.containsKey(key);
		}

		@Override
		public boolean containsValue(Object value) {
			return variables.containsValue(value);
		}

		@Override
		public Object get(Object key) {
			return variables.get(key);
		}

		@NonNull
		@Override
		public Object put(String key, Object value) {
			return put(key, value, false);
		}

		@Override
		public Object put(String key, Object value, boolean override) {
			return !override && variables.containsKey(key) ? variables.get(key) : variables.put(key, value);
		}

		@Override
		public Object remove(Object key) {
			return variables.remove(key);
		}

		@Override
		public void putAll(@NonNull Map m) {
			variables.putAll(m);
		}

		@Override
		public void putAll(Map m, boolean override) {
			if (override) {
				variables.putAll(m);
			}
			else {
				for (Entry entry : m.entrySet()) {
					if (!variables.containsKey(entry.getKey())) {
						variables.put(entry.getKey(), entry.getValue());
					}
				}
			}
		}

		@Override
		public void clear() {
			variables.clear();
		}

		@NonNull
		@Override
		public Set keySet() {
			return variables.keySet();
		}

		@NonNull
		@Override
		public Collection