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package com.salesforce.phoenix.iterate;

import static com.salesforce.phoenix.query.QueryConstants.SINGLE_COLUMN;
import static com.salesforce.phoenix.query.QueryConstants.SINGLE_COLUMN_FAMILY;

import java.sql.SQLException;
import java.util.*;

import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;

import com.salesforce.phoenix.schema.tuple.SingleKeyValueTuple;
import com.salesforce.phoenix.schema.tuple.Tuple;
import com.salesforce.phoenix.util.AssertResults;


public class MergeSortResultIteratorTest {
    private final static byte[] A = Bytes.toBytes("a");
    private final static byte[] B = Bytes.toBytes("b");

    @Test
    public void testMergeSort() throws Throwable {
        Tuple[] results1 = new Tuple[] {
                new SingleKeyValueTuple(new KeyValue(A, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
            };
        Tuple[] results2 = new Tuple[] {
                new SingleKeyValueTuple(new KeyValue(B, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1)))
            };
        Tuple[] results3 = new Tuple[] {
                new SingleKeyValueTuple(new KeyValue(A, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
                new SingleKeyValueTuple(new KeyValue(B, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
            };
        final List<PeekingResultIterator>results = new ArrayList<PeekingResultIterator>(Arrays.asList(new PeekingResultIterator[] {new MaterializedResultIterator(Arrays.asList(results1)), new MaterializedResultIterator(Arrays.asList(results2)), new MaterializedResultIterator(Arrays.asList(results3))}));

        Tuple[] expectedResults = new Tuple[] {
                new SingleKeyValueTuple(new KeyValue(A, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
                new SingleKeyValueTuple(new KeyValue(A, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
                new SingleKeyValueTuple(new KeyValue(B, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
                new SingleKeyValueTuple(new KeyValue(B, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, Bytes.toBytes(1))),
            };

        ResultIterators iterators = new ResultIterators() {

            @Override
            public List<PeekingResultIterator> getIterators() throws SQLException {
                return results;
            }

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

            @Override
            public void explain(List<String> planSteps) {
            }
            
        };
        ResultIterator scanner = new MergeSortRowKeyResultIterator(iterators);
        AssertResults.assertResults(scanner, expectedResults);
    }

}
