// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
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// ==========================================================================
// Author: Manuel Holtgrewe <manuel.holtgrewe@fu-berlin.de>
// ==========================================================================
// Tests for the align_split module.
// ==========================================================================

#ifndef SEQAN_TESTS_ALIGN_SPLIT_TEST_ALIGN_SPLIT_H_
#define SEQAN_TESTS_ALIGN_SPLIT_TEST_ALIGN_SPLIT_H_

#include <seqan/basic.h>
#include <seqan/sequence.h>

#include <seqan/align_split.h>

SEQAN_DEFINE_TEST(test_align_split_overlapping_reads_in_reference_align_unbanded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT";
    seqan2::DnaString seqR =                         "GGCTAGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Align<seqan2::DnaString> alignL, alignR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    resize(rows(alignL), 2);
    assignSource(row(alignL, 0), contig);
    assignSource(row(alignL, 1), seqL);
    resize(rows(alignR), 2);
    assignSource(row(alignR, 0), contig);
    assignSource(row(alignR, 1), seqR);

    int res = splitAlignment(alignL, alignR, score);
    // clearClipping(row(alignL, 0));
    // clearClipping(row(alignL, 1));
    // clearClipping(row(alignR, 0));
    // clearClipping(row(alignR, 1));
    // std::cerr << "alignL\n"
    //           << alignL
    //           << "--------------\n"
    //           << "alignR\n"
    //           << alignR;
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << row(alignL, 0) << row(alignR, 0);
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), row(alignL, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), row(alignL, 1));
    SEQAN_ASSERT_EQ(clippedBeginPosition(row(alignL, 0)), 0);
    SEQAN_ASSERT_EQ(clippedBeginPosition(row(alignL, 1)), 0);
    SEQAN_ASSERT_EQ(clippedEndPosition(row(alignL, 0)), 23);
    SEQAN_ASSERT_EQ(clippedEndPosition(row(alignL, 1)), 23);

    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), row(alignR, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), row(alignR, 1));
    SEQAN_ASSERT_EQ(clippedBeginPosition(row(alignR, 0)), 23);
    SEQAN_ASSERT_EQ(clippedBeginPosition(row(alignR, 1)), 1);
    SEQAN_ASSERT_EQ(clippedEndPosition(row(alignR, 0)), 45);
    SEQAN_ASSERT_EQ(clippedEndPosition(row(alignR, 1)), 23);
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_contigs_in_reference_align_unbanded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCT"                                   "AGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT""TTCTCCTCCTGCAAATAAAACCTCACCCATGAATGCTCACGCAAG";
    seqan2::DnaString seqR =   "TTTCCTCGCTTGGTGGTTTGAGTGGACCTCCCAGGCCAGTGCCGGGCCCCTCATAGGGGCT""AGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Align<seqan2::DnaString> alignL, alignR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    resize(rows(alignL), 2);
    assignSource(row(alignL, 0), contig);
    assignSource(row(alignL, 1), seqL);
    resize(rows(alignR), 2);
    assignSource(row(alignR, 0), contig);
    assignSource(row(alignR, 1), seqR);

    int res = splitAlignment(alignL, alignR, score);
    // clearClipping(row(alignL, 0));
    // clearClipping(row(alignL, 1));
    // clearClipping(row(alignR, 0));
    // clearClipping(row(alignR, 1));
    // std::cerr << "alignL\n"
    //           << alignL
    //           << "--------------\n"
    //           << "alignR\n"
    //           << alignR;
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << row(alignL, 0) << row(alignR, 0);
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), row(alignL, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), row(alignL, 1));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), row(alignR, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), row(alignR, 1));
}

SEQAN_DEFINE_TEST(test_align_split_insertion_in_reference_align_unbanded)
{
    // Define the input sequences.  contig1 has an insertion with respect to contig1.
    seqan2::DnaString contig1 = "AGCATTTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCTT";
    seqan2::DnaString contig2 = "AGCATGTTAGATAAGATAGCCCCCCCCCCCCTGTGCTAGTAGGCAGTCAGCGCCAT";

    // Variables for the alignments.
    seqan2::Align<seqan2::DnaString> alignL, alignR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    resize(rows(alignL), 2);
    assignSource(row(alignL, 0), contig1);
    assignSource(row(alignL, 1), contig2);
    resize(rows(alignR), 2);
    assignSource(row(alignR, 0), contig1);
    assignSource(row(alignR, 1), contig2);

    int res = splitAlignment(alignL, alignR, score);
    // clearClipping(row(alignL, 0));
    // clearClipping(row(alignL, 1));
    // clearClipping(row(alignR, 0));
    // clearClipping(row(alignR, 1));
    // std::cerr << "alignL\n"
    //           << alignL
    //           << "--------------\n"
    //           << "alignR\n"
    //           << alignR;
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << row(alignL, 0) << row(alignR, 0);
    SEQAN_ASSERT_EQ(contig1, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATTTTAGATAAGATAG"), row(alignL, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAG"), row(alignL, 1));
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCTT"), row(alignR, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCAT"), row(alignR, 1));
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_reads_in_reference_gaps_unbanded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT";
    seqan2::DnaString seqR =                         "GGCTAGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Gaps<seqan2::DnaString> gapsHL, gapsVL, gapsHR, gapsVR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    assignSource(gapsHL, contig);
    assignSource(gapsVL, seqL);
    assignSource(gapsHR, contig);
    assignSource(gapsVR, seqR);

    int res = splitAlignment(gapsHL, gapsVL, gapsHR, gapsVR, score);
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << gapsHL << gapsHR;
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), gapsHL);
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), gapsVL);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), gapsHR);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), gapsVR);
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_contigs_in_reference_gaps_unbanded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCT"                                   "AGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT""TTCTCCTCCTGCAAATAAAACCTCACCCATGAATGCTCACGCAAG";
    seqan2::DnaString seqR =   "TTTCCTCGCTTGGTGGTTTGAGTGGACCTCCCAGGCCAGTGCCGGGCCCCTCATAGGGGCT""AGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Gaps<seqan2::DnaString> gapsHL, gapsVL, gapsHR, gapsVR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    assignSource(gapsHL, contig);
    assignSource(gapsVL, seqL);
    assignSource(gapsHR, contig);
    assignSource(gapsVR, seqR);

    int res = splitAlignment(gapsHL, gapsVL, gapsHR, gapsVR, score);
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << gapsHL << gapsHR;
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), gapsHL);
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), gapsVL);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), gapsHR);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), gapsVR);
}

SEQAN_DEFINE_TEST(test_align_split_insertion_in_reference_gaps_unbanded)
{
    // Define the input sequences.  contig1 has an insertion with respect to contig1.
    seqan2::DnaString contig1 = "AGCATTTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCTT";
    seqan2::DnaString contig2 = "AGCATGTTAGATAAGATAGCCCCCCCCCCCCTGTGCTAGTAGGCAGTCAGCGCCAT";

    // Variables for the alignments.
    seqan2::Gaps<seqan2::DnaString> gapsHL, gapsVL, gapsHR, gapsVR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    assignSource(gapsHL, contig1);
    assignSource(gapsVL, contig2);
    assignSource(gapsHR, contig1);
    assignSource(gapsVR, contig2);

    int res = splitAlignment(gapsHL, gapsVL, gapsHR, gapsVR, score);
    // clearClipping(gapsHL);
    // clearClipping(gapsVL);
    // clearClipping(gapsHR);
    // clearClipping(gapsVR);
    // std::cerr << "gapsHL\n"
    //           << gapsHL << "\n"
    //           << "gapsVL\n"
    //           << gapsVL << "\n"
    //           << "gapsHL\n"
    //           << gapsHL << "\n"
    //           << "gapsHR\n"
    //           << gapsHR << "\n";
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << gapsHL << gapsHR;
    SEQAN_ASSERT_EQ(contig1, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATTTTAGATAAGATAG"), gapsHL);
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAG"), gapsVL);
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCTT"), gapsHR);
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCAT"), gapsVR);
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_reads_in_reference_align_banded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT";
    seqan2::DnaString seqR =                         "GGCTAGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Align<seqan2::DnaString> alignL, alignR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    resize(rows(alignL), 2);
    assignSource(row(alignL, 0), contig);
    assignSource(row(alignL, 1), seqL);
    resize(rows(alignR), 2);
    assignSource(row(alignR, 0), contig);
    assignSource(row(alignR, 1), seqR);

    int res = splitAlignment(alignL, alignR, score, -10, 10);

    // clearClipping(row(alignL, 0));
    // clearClipping(row(alignL, 1));
    // clearClipping(row(alignR, 0));
    // clearClipping(row(alignR, 1));
    // std::cerr << "alignL\n"
    //           << alignL
    //           << "--------------\n"
    //           << "alignR\n"
    //           << alignR;

    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << row(alignL, 0) << row(alignR, 0);
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), row(alignL, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), row(alignL, 1));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), row(alignR, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), row(alignR, 1));
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_contigs_in_reference_align_banded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCT"                                   "AGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT""TTCTCCTCCTGCAAATAAAACCTCACCCATGAATGCTCACGCAAG";
    seqan2::DnaString seqR =   "TTTCCTCGCTTGGTGGTTTGAGTGGACCTCCCAGGCCAGTGCCGGGCCCCTCATAGGGGCT""AGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Align<seqan2::DnaString> alignL, alignR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    resize(rows(alignL), 2);
    assignSource(row(alignL, 0), contig);
    assignSource(row(alignL, 1), seqL);
    resize(rows(alignR), 2);
    assignSource(row(alignR, 0), contig);
    assignSource(row(alignR, 1), seqR);

    int res = splitAlignment(alignL, alignR, score, -10, 10);
    // clearClipping(row(alignL, 0));
    // clearClipping(row(alignL, 1));
    // clearClipping(row(alignR, 0));
    // clearClipping(row(alignR, 1));
    // std::cerr << "alignL\n"
    //           << alignL
    //           << "--------------\n"
    //           << "alignR\n"
    //           << alignR;
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << row(alignL, 0) << row(alignR, 0);
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), row(alignL, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), row(alignL, 1));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), row(alignR, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), row(alignR, 1));
}

SEQAN_DEFINE_TEST(test_align_split_insertion_in_reference_align_banded)
{
    // Define the input sequences.  contig1 has an insertion with respect to contig1.
    seqan2::DnaString contig1 = "AGCATTTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCTT";
    seqan2::DnaString contig2 = "AGCATGTTAGATAAGATAGCCCCCCCCCCCCTGTGCTAGTAGGCAGTCAGCGCCAT";

    // Variables for the alignments.
    seqan2::Align<seqan2::DnaString> alignL, alignR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    resize(rows(alignL), 2);
    assignSource(row(alignL, 0), contig1);
    assignSource(row(alignL, 1), contig2);
    resize(rows(alignR), 2);
    assignSource(row(alignR, 0), contig1);
    assignSource(row(alignR, 1), contig2);

    int res = splitAlignment(alignL, alignR, score, -12, 0);
    // clearClipping(row(alignL, 0));
    // clearClipping(row(alignL, 1));
    // clearClipping(row(alignR, 0));
    // clearClipping(row(alignR, 1));
    // std::cerr << "alignL\n"
    //           << alignL
    //           << "--------------\n"
    //           << "alignR\n"
    //           << alignR;
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << row(alignL, 0) << row(alignR, 0);
    SEQAN_ASSERT_EQ(contig1, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATTTTAGATAAGATAG"), row(alignL, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAG"), row(alignL, 1));
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCTT"), row(alignR, 0));
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCAT"), row(alignR, 1));
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_reads_in_reference_gaps_banded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT";
    seqan2::DnaString seqR =                         "GGCTAGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Gaps<seqan2::DnaString> gapsHL, gapsVL, gapsHR, gapsVR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    assignSource(gapsHL, contig);
    assignSource(gapsVL, seqL);
    assignSource(gapsHR, contig);
    assignSource(gapsVR, seqR);

    int res = splitAlignment(gapsHL, gapsVL, gapsHR, gapsVR, score, -10, 10);
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << gapsHL << gapsHR;
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), gapsHL);
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), gapsVL);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), gapsHR);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), gapsVR);
}

SEQAN_DEFINE_TEST(test_align_split_overlapping_contigs_in_reference_gaps_banded)
{
    // Define the input sequences.
    seqan2::DnaString contig = "AGCATGTTAGATAAGATAGCTGTGCT"                                   "AGTAGGCAGTCAGCGCCAT";
    seqan2::DnaString seqL =   "AGCCTGTTAGATAAGATAGCTGTGGT""TTCTCCTCCTGCAAATAAAACCTCACCCATGAATGCTCACGCAAG";
    seqan2::DnaString seqR =   "TTTCCTCGCTTGGTGGTTTGAGTGGACCTCCCAGGCCAGTGCCGGGCCCCTCATAGGGGCT""AGTAGGCAGTCAGCGACAT";

    // Variables for the alignments.
    seqan2::Gaps<seqan2::DnaString> gapsHL, gapsVL, gapsHR, gapsVR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    assignSource(gapsHL, contig);
    assignSource(gapsVL, seqL);
    assignSource(gapsHR, contig);
    assignSource(gapsVR, seqR);

    int res = splitAlignment(gapsHL, gapsVL, gapsHR, gapsVR, score, -10, 10);
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << gapsHL << gapsHR;
    SEQAN_ASSERT_EQ(contig, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAGCTGT"), gapsHL);
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCCTGTTAGATAAGATAGCTGT"), gapsVL);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGCCAT"), gapsHR);
    SEQAN_ASSERT_EQ(seqan2::CharString("GCTAGTAGGCAGTCAGCGACAT"), gapsVR);
}

SEQAN_DEFINE_TEST(test_align_split_insertion_in_reference_gaps_banded)
{
    // Define the input sequences.  contig1 has an insertion with respect to contig1.
    seqan2::DnaString contig1 = "AGCATTTTAGATAAGATAGCTGTGCTAGTAGGCAGTCAGCGCCTT";
    seqan2::DnaString contig2 = "AGCATGTTAGATAAGATAGCCCCCCCCCCCCTGTGCTAGTAGGCAGTCAGCGCCAT";

    // Variables for the alignments.
    seqan2::Gaps<seqan2::DnaString> gapsHL, gapsVL, gapsHR, gapsVR;
    seqan2::Score<int, seqan2::Simple> score(0, -1, -1, -1);

    assignSource(gapsHL, contig1);
    assignSource(gapsVL, contig2);
    assignSource(gapsHR, contig1);
    assignSource(gapsVR, contig2);

    int res = splitAlignment(gapsHL, gapsVL, gapsHR, gapsVR, score, -12, 0);
    // clearClipping(gapsHL);
    // clearClipping(gapsVL);
    // clearClipping(gapsHR);
    // clearClipping(gapsVR);
    // std::cerr << "gapsHL\n"
    //           << gapsHL << "\n"
    //           << "gapsVL\n"
    //           << gapsVL << "\n"
    //           << "gapsHL\n"
    //           << gapsHL << "\n"
    //           << "gapsHR\n"
    //           << gapsHR << "\n";
    SEQAN_ASSERT_EQ(res, -2);

    std::stringstream contigS;
    contigS << gapsHL << gapsHR;
    SEQAN_ASSERT_EQ(contig1, contigS.str());

    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATTTTAGATAAGATAG"), gapsHL);
    SEQAN_ASSERT_EQ(seqan2::CharString("AGCATGTTAGATAAGATAG"), gapsVL);
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCTT"), gapsHR);
    SEQAN_ASSERT_EQ(seqan2::CharString("CTGTGCTAGTAGGCAGTCAGCGCCAT"), gapsVR);
}

SEQAN_DEFINE_TEST(test_align_split_issue_1679)
{
    using namespace seqan2;

    // Scenario 1:
    DnaString refLeft  = "TTTTTTTTTTTTGAGCCGATTTTTTTT";
    DnaString refRight = "CCCCCCCCCCCCCCCCGGACCGTTTTTTTTTTTTTTTTTTTTTTT";
    DnaString read     = "GAGCCGA" "GGACCG";

    Gaps<DnaString> refGapsLeft;
    Gaps<DnaString> refGapsRight;
    Gaps<DnaString> readGapsLeft;
    Gaps<DnaString> readGapsRight;

    setSource(refGapsLeft, refLeft);
    setSource(refGapsRight, refRight);
    setSource(readGapsLeft, read);
    setSource(readGapsRight, read);

    Score<int> scoring(1, -3, -4, -5);

    int splitScore = splitAlignment(readGapsLeft, refGapsLeft, readGapsRight, refGapsRight, scoring,
                                    AlignConfig<false, true, true, true>());

    SEQAN_ASSERT_EQ(splitScore, 13);
    SEQAN_ASSERT_EQ(readGapsLeft, "------------GAGCCGA");
    SEQAN_ASSERT_EQ(refGapsLeft,  "TTTTTTTTTTTTGAGCCGA");
    SEQAN_ASSERT_EQ(readGapsRight, "GGACCG-----------------------");
    SEQAN_ASSERT_EQ(refGapsRight,  "GGACCGTTTTTTTTTTTTTTTTTTTTTTT");

    // Scenario 2:
    refLeft  = "AGGCGCACGCCACCACCAAGCCCGGCTAAAGTTTTGTGTTTTTAGTATAGATGGGGTTTCGCCATGTTGGCCTGGCTGGTCTCGAATTCCTGACCTCAGGTGATCCACCCGCCCTGGCCTCCCAAAG";
    read     = "AGGGGTTTCGCCATGTTGGCCTGGCTGGTCTCGAATTCCTGACCTCAGGTGATCCACCCGCCCTGGCCTCCCAAAGTGCTGGGATTACAGGCCTGAGCCGCTGCACCCGGCCCAGAGGCATTTATTTAAAATGTGCAATAAAAGTGTTCTG";
    refRight = "AGAGACAGGGTTTTACCATGTTGGCCAGGCTGGTCTTGAGCTCCTGACCTCAGGTGATCCACCCGCCCTGGCCTCCCAAAGTGCTGGGATTACAGGCCTGAGCCGCTGCACCCGGCCCAGAGGCATTTATTTAAAATGTGCAATAAAAGTGTTCTGAGCTTCCCTTACGTACA";

    setSource(refGapsLeft, refLeft);
    setSource(refGapsRight, refRight);
    setSource(readGapsLeft, read);
    setSource(readGapsRight, read);

    splitScore = splitAlignment(readGapsLeft, refGapsLeft, readGapsRight, refGapsRight, scoring,
                                AlignConfig<false, true, true, true>());

    SEQAN_ASSERT_EQ(splitScore, 147);
    SEQAN_ASSERT_EQ(refGapsLeft, "AGGCGCACGCCACCACCAAGCCCGGCTAAAGTTTTGTGTTTTTAGTATAGATGGGGTTTCGCCATGTTGGCCTGGCTGGTCTCGAAT");
    SEQAN_ASSERT_EQ(readGapsLeft, "---------------------------------------------------AGGGGTTTCGCCATGTTGGCCTGGCTGGTCTCGAAT");

    SEQAN_ASSERT_EQ(refGapsRight,  "TCCTGACCTCAGGTGATCCACCCGCCCTGGCCTCCCAAAGTGCTGGGATTACAGGCCTGAGCCGCTGCACCCGGCCCAGAGGCATTTATTTAAAATGTGCAATAAAAGTGTTCTGAGCTTCCCTTACGTACA");
    SEQAN_ASSERT_EQ(readGapsRight, "TCCTGACCTCAGGTGATCCACCCGCCCTGGCCTCCCAAAGTGCTGGGATTACAGGCCTGAGCCGCTGCACCCGGCCCAGAGGCATTTATTTAAAATGTGCAATAAAAGTGTTCTG-----------------");

    // Scenario 3:
    read     =           "ATTTTTTTTTTTTTAAATTCTAATATTATGAAGAA";
    refLeft  = "ACACCCGGCTATTTTTTTTTTTTTTTTTT";
    refRight =       "TTCTTCTTCATTTATCTGAAATTCTAATATGATGAAGAATCCTGCTT";

    setSource(refGapsLeft, refLeft);
    setSource(refGapsRight, refRight);
    setSource(readGapsLeft, read);
    setSource(readGapsRight, read);

    splitScore = splitAlignment(readGapsLeft, refGapsLeft, readGapsRight, refGapsRight, scoring,
                                AlignConfig<false, true, true, true>());

    SEQAN_ASSERT_EQ(splitScore, 31);
    SEQAN_ASSERT_EQ(readGapsLeft, "----------ATTTTTTTTTTTTT");
    SEQAN_ASSERT_EQ(refGapsLeft,  "ACACCCGGCTATTTTTTTTTTTTT");

    SEQAN_ASSERT_EQ(readGapsRight, "AAATTCTAATATTATGAAGAA--------");
    SEQAN_ASSERT_EQ(refGapsRight,  "AAATTCTAATATGATGAAGAATCCTGCTT");
}

#endif  // SEQAN_TESTS_ALIGN_SPLIT_TEST_ALIGN_SPLIT_H_
