/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.amazon.awssdk.enhanced.dynamodb.functionaltests;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.nullValue;
import static software.amazon.awssdk.enhanced.dynamodb.mapper.StaticAttributeTags.primaryPartitionKey;

import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import software.amazon.awssdk.enhanced.dynamodb.Document;
import software.amazon.awssdk.enhanced.dynamodb.DynamoDbEnhancedClient;
import software.amazon.awssdk.enhanced.dynamodb.DynamoDbTable;
import software.amazon.awssdk.enhanced.dynamodb.Key;
import software.amazon.awssdk.enhanced.dynamodb.TableSchema;
import software.amazon.awssdk.enhanced.dynamodb.mapper.StaticTableSchema;
import software.amazon.awssdk.enhanced.dynamodb.model.TransactGetItemsEnhancedRequest;
import software.amazon.awssdk.services.dynamodb.model.DeleteTableRequest;

public class TransactGetItemsTest extends LocalDynamoDbSyncTestBase {
    private static class Record1 {
        private Integer id;

        private Integer getId() {
            return id;
        }

        private Record1 setId(Integer id) {
            this.id = id;
            return this;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Record1 record1 = (Record1) o;
            return Objects.equals(id, record1.id);
        }

        @Override
        public int hashCode() {
            return Objects.hash(id);
        }
    }

    private static class Record2 {
        private Integer id;

        private Integer getId() {
            return id;
        }

        private Record2 setId(Integer id) {
            this.id = id;
            return this;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Record2 record2 = (Record2) o;
            return Objects.equals(id, record2.id);
        }

        @Override
        public int hashCode() {
            return Objects.hash(id);
        }
    }

    private static final TableSchema<Record1> TABLE_SCHEMA_1 =
        StaticTableSchema.builder(Record1.class)
                         .newItemSupplier(Record1::new)
                         .addAttribute(Integer.class, a -> a.name("id_1")
                                                            .getter(Record1::getId)
                                                            .setter(Record1::setId)
                                                            .tags(primaryPartitionKey()))
                         .build();

    private static final TableSchema<Record2> TABLE_SCHEMA_2 =
        StaticTableSchema.builder(Record2.class)
                         .newItemSupplier(Record2::new)
                         .addAttribute(Integer.class, a -> a.name("id_2")
                                                            .getter(Record2::getId)
                                                            .setter(Record2::setId)
                                                            .tags(primaryPartitionKey()))
                         .build();

    private DynamoDbEnhancedClient enhancedClient = DynamoDbEnhancedClient.builder()
                                                                          .dynamoDbClient(getDynamoDbClient())
                                                                          .build();

    private DynamoDbTable<Record1> mappedTable1 = enhancedClient.table(getConcreteTableName("table-name-1"), TABLE_SCHEMA_1);
    private DynamoDbTable<Record2> mappedTable2 = enhancedClient.table(getConcreteTableName("table-name-2"), TABLE_SCHEMA_2);

    private static final List<Record1> RECORDS_1 =
        IntStream.range(0, 2)
                 .mapToObj(i -> new Record1().setId(i))
                 .collect(Collectors.toList());

    private static final List<Record2> RECORDS_2 =
        IntStream.range(0, 2)
                 .mapToObj(i -> new Record2().setId(i))
                 .collect(Collectors.toList());

    @Before
    public void createTable() {
        mappedTable1.createTable(r -> r.provisionedThroughput(getDefaultProvisionedThroughput()));
        mappedTable2.createTable(r -> r.provisionedThroughput(getDefaultProvisionedThroughput()));
    }

    @After
    public void deleteTable() {
        getDynamoDbClient().deleteTable(DeleteTableRequest.builder()
                                                          .tableName(getConcreteTableName("table-name-1"))
                                                          .build());
        getDynamoDbClient().deleteTable(DeleteTableRequest.builder()
                                                          .tableName(getConcreteTableName("table-name-2"))
                                                          .build());
    }

    private void insertRecords() {
        RECORDS_1.forEach(record -> mappedTable1.putItem(r -> r.item(record)));
        RECORDS_2.forEach(record -> mappedTable2.putItem(r -> r.item(record)));
    }

    @Test
    public void getRecordsFromMultipleTables() {
        insertRecords();

        TransactGetItemsEnhancedRequest transactGetItemsEnhancedRequest =
            TransactGetItemsEnhancedRequest.builder()
                                           .addGetItem(mappedTable1, Key.builder().partitionValue(0).build())
                                           .addGetItem(mappedTable2, Key.builder().partitionValue(0).build())
                                           .addGetItem(mappedTable2, Key.builder().partitionValue(1).build())
                                           .addGetItem(mappedTable1, Key.builder().partitionValue(1).build())
                                           .build();

        List<Document> results = enhancedClient.transactGetItems(transactGetItemsEnhancedRequest);

        assertThat(results.size(), is(4));
        assertThat(results.get(0).getItem(mappedTable1), is(RECORDS_1.get(0)));
        assertThat(results.get(1).getItem(mappedTable2), is(RECORDS_2.get(0)));
        assertThat(results.get(2).getItem(mappedTable2), is(RECORDS_2.get(1)));
        assertThat(results.get(3).getItem(mappedTable1), is(RECORDS_1.get(1)));
    }

    @Test
    public void notFoundRecordReturnsNull() {
        insertRecords();

        TransactGetItemsEnhancedRequest transactGetItemsEnhancedRequest =
            TransactGetItemsEnhancedRequest.builder()
                                           .addGetItem(mappedTable1, Key.builder().partitionValue(0).build())
                                           .addGetItem(mappedTable2, Key.builder().partitionValue(0).build())
                                           .addGetItem(mappedTable2, Key.builder().partitionValue(5).build())
                                           .addGetItem(mappedTable1, Key.builder().partitionValue(1).build())
                                           .build();

        List<Document> results = enhancedClient.transactGetItems(transactGetItemsEnhancedRequest);

        assertThat(results.size(), is(4));
        assertThat(results.get(0).getItem(mappedTable1), is(RECORDS_1.get(0)));
        assertThat(results.get(1).getItem(mappedTable2), is(RECORDS_2.get(0)));
        assertThat(results.get(2).getItem(mappedTable2), is(nullValue()));
        assertThat(results.get(3).getItem(mappedTable1), is(RECORDS_1.get(1)));
    }
}