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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.ingest;

import java.util.List;
import java.util.Map;
import java.util.Objects;

public class IngestDocumentMatcher {
    /**
     * Helper method to assert the equivalence between two IngestDocuments.
     *
     * @param docA first document to compare
     * @param docB second document to compare
     */
    public static void assertIngestDocument(IngestDocument docA, IngestDocument docB) {
        if ((deepEquals(docA.getIngestMetadata(), docB.getIngestMetadata(), true)
            && deepEquals(docA.getSourceAndMetadata(), docB.getSourceAndMetadata(), false)) == false) {
            throw new AssertionError("Expected [" + docA + "] but received [" + docB + "].");
        }
    }

    private static boolean deepEquals(Object a, Object b, boolean isIngestMeta) {
        if (a instanceof Map mapA) {
            if (b instanceof Map == false) {
                return false;
            }
            Map mapB = (Map) b;
            if (mapA.size() != mapB.size()) {
                return false;
            }
            for (Map.Entry entry : mapA.entrySet()) {
                Object key = entry.getKey();
                // Don't compare the timestamp of ingest metadata since it will differ between executions
                if ((isIngestMeta && "timestamp".equals(key)) == false && deepEquals(entry.getValue(), mapB.get(key), false) == false) {
                    return false;
                }
            }
            return true;
        } else if (a instanceof List listA) {
            if (b instanceof List == false) {
                return false;
            }
            List listB = (List) b;
            int countA = listA.size();
            if (countA != listB.size()) {
                return false;
            }
            for (int i = 0; i < countA; i++) {
                Object value = listA.get(i);
                if (deepEquals(value, listB.get(i), false) == false) {
                    return false;
                }
            }
            return true;
        } else {
            return Objects.deepEquals(a, b);
        }
    }
}