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/*
 * Copyright 2019-2023 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 org.springframework.data.relational.core.conversion;

import static java.util.Arrays.*;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.data.mapping.PersistentPropertyPath;
import org.springframework.data.relational.core.mapping.PersistentPropertyPathExtension;
import org.springframework.data.relational.core.mapping.RelationalMappingContext;
import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
import org.springframework.data.util.Pair;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * Holds context information for the current save operation.
 *
 * @author Jens Schauder
 * @author Bastian Wilhelm
 * @author Mark Paluch
 * @author Myeonghyeon Lee
 * @author Chirag Tailor
 */
class WritingContext {

	private final RelationalMappingContext context;
	private final T root;
	private final Class entityType;
	private final List> paths;
	private final Map> previousActions = new HashMap<>();
	private final Map, List> nodesCache = new HashMap<>();
	private final IdValueSource rootIdValueSource;
	@Nullable private final Number previousVersion;
	private final RootAggregateChange aggregateChange;

	WritingContext(RelationalMappingContext context, T root, RootAggregateChange aggregateChange) {

		this.context = context;
		this.root = root;
		this.entityType = aggregateChange.getEntityType();
		this.previousVersion = aggregateChange.getPreviousVersion();
		this.aggregateChange = aggregateChange;
		this.rootIdValueSource = IdValueSource.forInstance(root,
				context.getRequiredPersistentEntity(aggregateChange.getEntityType()));
		this.paths = context.findPersistentPropertyPaths(entityType, (p) -> p.isEntity() && !p.isEmbedded()) //
				.filter(PersistentPropertyPathExtension::isWritable).toList();
	}

	/**
	 * Leaves out the isNew check as defined in #DATAJDBC-282
	 *
	 * @see DAJDBC-282
	 */
	void insert() {

		setRootAction(new DbAction.InsertRoot<>(root, rootIdValueSource));
		insertReferenced().forEach(aggregateChange::addAction);
	}

	/**
	 * Leaves out the isNew check as defined in #DATAJDBC-282 Possible Deadlocks in Execution Order in #DATAJDBC-488
	 *
	 * @see DAJDBC-282
	 * @see DAJDBC-488
	 */
	void update() {

		setRootAction(new DbAction.UpdateRoot<>(root, previousVersion));
		deleteReferenced().forEach(aggregateChange::addAction);
		insertReferenced().forEach(aggregateChange::addAction);
	}

	void save() {

		if (isNew(root)) {

			setRootAction(new DbAction.InsertRoot<>(root, rootIdValueSource));
			insertReferenced().forEach(aggregateChange::addAction);
		} else {

			setRootAction(new DbAction.UpdateRoot<>(root, previousVersion));
			deleteReferenced().forEach(aggregateChange::addAction);
			insertReferenced().forEach(aggregateChange::addAction);
		}
	}

	private boolean isNew(Object o) {
		return context.getRequiredPersistentEntity(o.getClass()).isNew(o);
	}

	//// Operations on all paths

	private List> insertReferenced() {

		List> actions = new ArrayList<>();

		paths.forEach(path -> actions.addAll(insertAll(path)));

		return actions;
	}

	@SuppressWarnings("unchecked")
	private List> insertAll(PersistentPropertyPath path) {

		RelationalPersistentEntity persistentEntity = context
				.getRequiredPersistentEntity(path.getLeafProperty());
		List> inserts = new ArrayList<>();
		from(path).forEach(node -> {

			DbAction.WithEntity parentAction = getAction(node.getParent());
			Map, Object> qualifiers = new HashMap<>();
			Object instance;
			if (node.getPath().getLeafProperty().isQualified()) {

				Pair value = (Pair) node.getValue();
				qualifiers.put(node.getPath(), value.getFirst());

				RelationalPersistentEntity parentEntity = context.getRequiredPersistentEntity(parentAction.getEntityType());

				if (!parentEntity.hasIdProperty() && parentAction instanceof DbAction.Insert) {
					qualifiers.putAll(((DbAction.Insert) parentAction).getQualifiers());
				}
				instance = value.getSecond();
			} else {
				instance = node.getValue();
			}
			IdValueSource idValueSource = IdValueSource.forInstance(instance, persistentEntity);
			DbAction.Insert