#include <iostream>
#include <string>
#include <random>
#include <gtest/gtest.h>

#include "dog_segment/collection_c.h"
#include "dog_segment/segment_c.h"

#include <chrono>
namespace chrono = std::chrono;

TEST(CApiTest, CollectionTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    DeleteCollection(collection);
}


TEST(CApiTest, PartitonTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    DeleteCollection(collection);
    DeletePartition(partition);
}


TEST(CApiTest, SegmentTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);
    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, InsertTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    std::vector<char> raw_data;
    std::vector<uint64_t> timestamps;
    std::vector<int64_t> uids;
    int N = 10000;
    std::default_random_engine e(67);
    for (int i = 0; i < N; ++i) {
        uids.push_back(100000 + i);
        timestamps.push_back(0);
        // append vec
        float vec[16];
        for (auto& x : vec) {
            x = e() % 2000 * 0.001 - 1.0;
        }
        raw_data.insert(
            raw_data.end(), (const char*)std::begin(vec), (const char*)std::end(vec));
        int age = e() % 100;
        raw_data.insert(
            raw_data.end(), (const char*)&age, ((const char*)&age) + sizeof(age));
    }

    auto line_sizeof = (sizeof(int) + sizeof(float) * 16);

    auto offset = PreInsert(segment, N);

    auto res = Insert(segment,
                      offset,
                      N,
                      uids.data(),
                      timestamps.data(),
                      raw_data.data(),
                      (int)line_sizeof,
                      N);

    assert(res == 0);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, DeleteTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    long delete_primary_keys[] = {100000, 100001, 100002};
    unsigned long delete_timestamps[] = {0, 0, 0};

    auto offset = PreDelete(segment, 3);

    auto del_res = Delete(segment, offset, 3, delete_primary_keys, delete_timestamps);
    assert(del_res == 0);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, SearchTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    std::vector<char> raw_data;
    std::vector<uint64_t> timestamps;
    std::vector<int64_t> uids;
    int N = 10000;
    std::default_random_engine e(67);
    for (int i = 0; i < N; ++i) {
        uids.push_back(100000 + i);
        timestamps.push_back(0);
        // append vec
        float vec[16];
        for (auto& x : vec) {
            x = e() % 2000 * 0.001 - 1.0;
        }
        raw_data.insert(
            raw_data.end(), (const char*)std::begin(vec), (const char*)std::end(vec));
        int age = e() % 100;
        raw_data.insert(
            raw_data.end(), (const char*)&age, ((const char*)&age) + sizeof(age));
    }

    auto line_sizeof = (sizeof(int) + sizeof(float) * 16);

    auto offset = PreInsert(segment, N);

    auto ins_res = Insert(segment,
                          offset,
                          N,
                          uids.data(),
                          timestamps.data(),
                          raw_data.data(),
                          (int)line_sizeof,
                          N);
    assert(ins_res == 0);

    long result_ids[10];
    float result_distances[10];

    auto query_json =
        std::string(R"({"field_name":"fakevec","num_queries":1,"topK":10})");
    std::vector<float> query_raw_data(16);
    for (int i = 0; i < 16; i++) {
        query_raw_data[i] = e() % 2000 * 0.001 - 1.0;
    }

    CQueryInfo queryInfo{1, 10, "fakevec"};

    auto sea_res = Search(
        segment, queryInfo, 1, query_raw_data.data(), 16, result_ids, result_distances);
    assert(sea_res == 0);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, BuildIndexTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    std::vector<char> raw_data;
    std::vector<uint64_t> timestamps;
    std::vector<int64_t> uids;

    int N = 10000;
    int DIM = 16;

    std::vector<float> vec(DIM);
    for (int i = 0; i < DIM; i++) {
        vec[i] = i;
    }

    for (int i = 0; i < N; i++) {
        uids.push_back(i);
        timestamps.emplace_back(i);
        // append vec

        raw_data.insert(raw_data.end(),
                        (const char*)&vec[0],
                        ((const char*)&vec[0]) + sizeof(float) * vec.size());
        int age = i;
        raw_data.insert(
            raw_data.end(), (const char*)&age, ((const char*)&age) + sizeof(age));
    }

    auto line_sizeof = (sizeof(int) + sizeof(float) * DIM);

    auto offset = PreInsert(segment, N);

    auto ins_res = Insert(segment,
                          offset,
                          N,
                          uids.data(),
                          timestamps.data(),
                          raw_data.data(),
                          (int)line_sizeof,
                          N);
    assert(ins_res == 0);

    // TODO: add index ptr
    Close(segment);
    BuildIndex(collection, segment);

    long result_ids[10];
    float result_distances[10];

    std::vector<float> query_raw_data(DIM);
    for (int i = 0; i < DIM; i++) {
        query_raw_data[i] = i;
    }

    CQueryInfo queryInfo{1, 10, "fakevec"};

    auto sea_res = Search(
        segment, queryInfo, 20, query_raw_data.data(), DIM, result_ids, result_distances);
    assert(sea_res == 0);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, IsOpenedTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    auto is_opened = IsOpened(segment);
    assert(is_opened);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, CloseTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    auto status = Close(segment);
    assert(status == 0);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, GetMemoryUsageInBytesTest) {
  auto collection_name = "collection0";
  auto schema_tmp_conf = "";
  auto collection = NewCollection(collection_name, schema_tmp_conf);
  auto partition_name = "partition0";
  auto partition = NewPartition(collection, partition_name);
  auto segment = NewSegment(partition, 0);

  auto old_memory_usage_size = GetMemoryUsageInBytes(segment);
  std::cout << "old_memory_usage_size = " << old_memory_usage_size << std::endl;

  std::vector<char> raw_data;
  std::vector<uint64_t> timestamps;
  std::vector<int64_t> uids;
  int N = 10000;
  std::default_random_engine e(67);
  for (int i = 0; i < N; ++i) {
    uids.push_back(100000 + i);
    timestamps.push_back(0);
    // append vec
    float vec[16];
    for (auto &x: vec) {
      x = e() % 2000 * 0.001 - 1.0;
    }
    raw_data.insert(raw_data.end(), (const char *) std::begin(vec), (const char *) std::end(vec));
    int age = e() % 100;
    raw_data.insert(raw_data.end(), (const char *) &age, ((const char *) &age) + sizeof(age));
  }

  auto line_sizeof = (sizeof(int) + sizeof(float) * 16);

  auto offset = PreInsert(segment, N);

  auto res = Insert(segment, offset, N, uids.data(), timestamps.data(), raw_data.data(), (int) line_sizeof, N);

  assert(res == 0);

  auto memory_usage_size = GetMemoryUsageInBytes(segment);

  std::cout << "new_memory_usage_size = " << memory_usage_size << std::endl;

  assert(memory_usage_size == 2785280);

  DeleteCollection(collection);
  DeletePartition(partition);
  DeleteSegment(segment);
}


namespace {
auto
generate_data(int N) {
    std::vector<char> raw_data;
    std::vector<uint64_t> timestamps;
    std::vector<int64_t> uids;
    std::default_random_engine er(42);
    std::uniform_real_distribution<> distribution(0.0, 1.0);
    std::default_random_engine ei(42);
    for (int i = 0; i < N; ++i) {
        uids.push_back(10 * N + i);
        timestamps.push_back(0);
        // append vec
        float vec[16];
        for (auto& x : vec) {
            x = distribution(er);
        }
        raw_data.insert(
            raw_data.end(), (const char*)std::begin(vec), (const char*)std::end(vec));
        int age = ei() % 100;
        raw_data.insert(
            raw_data.end(), (const char*)&age, ((const char*)&age) + sizeof(age));
    }
    return std::make_tuple(raw_data, timestamps, uids);
}
}    // namespace


TEST(CApiTest, TestSearchPreference) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);


    auto beg = chrono::high_resolution_clock::now();
    auto next = beg;
    int N = 1000 * 1000 * 10;
    auto [raw_data, timestamps, uids] = generate_data(N);
    auto line_sizeof = (sizeof(int) + sizeof(float) * 16);

    next = chrono::high_resolution_clock::now();
    std::cout << "generate_data: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;


    auto offset = PreInsert(segment, N);
    auto res = Insert(segment,
                      offset,
                      N,
                      uids.data(),
                      timestamps.data(),
                      raw_data.data(),
                      (int)line_sizeof,
                      N);
    assert(res == 0);
    next = chrono::high_resolution_clock::now();
    std::cout << "insert: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;

    auto N_del = N / 100;
    std::vector<uint64_t> del_ts(N_del, 100);
    auto pre_off = PreDelete(segment, N_del);
    Delete(segment, pre_off, N_del, uids.data(), del_ts.data());

    next = chrono::high_resolution_clock::now();
    std::cout << "delete1: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;


    auto row_count = GetRowCount(segment);
    assert(row_count == N);

    std::vector<long> result_ids(10 * 16);
    std::vector<float> result_distances(10 * 16);

    CQueryInfo queryInfo{1, 10, "fakevec"};
    auto sea_res = Search(segment,
                          queryInfo,
                          104,
                          (float*)raw_data.data(),
                          16,
                          result_ids.data(),
                          result_distances.data());

    //    ASSERT_EQ(sea_res, 0);
    //    ASSERT_EQ(result_ids[0], 10 * N);
    //    ASSERT_EQ(result_distances[0], 0);

    next = chrono::high_resolution_clock::now();
    std::cout << "query1: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;
    sea_res = Search(segment,
                     queryInfo,
                     104,
                     (float*)raw_data.data(),
                     16,
                     result_ids.data(),
                     result_distances.data());

    //    ASSERT_EQ(sea_res, 0);
    //    ASSERT_EQ(result_ids[0], 10 * N);
    //    ASSERT_EQ(result_distances[0], 0);

    next = chrono::high_resolution_clock::now();
    std::cout << "query2: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;

    // Close(segment);
    // BuildIndex(segment);

    next = chrono::high_resolution_clock::now();
    std::cout << "build index: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;


    std::vector<int64_t> result_ids2(10);
    std::vector<float> result_distances2(10);

    sea_res = Search(segment,
                     queryInfo,
                     104,
                     (float*)raw_data.data(),
                     16,
                     result_ids2.data(),
                     result_distances2.data());

    //    sea_res = Search(segment, nullptr, 104, result_ids2.data(),
    //    result_distances2.data());

    next = chrono::high_resolution_clock::now();
    std::cout << "search10: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;

    sea_res = Search(segment,
                     queryInfo,
                     104,
                     (float*)raw_data.data(),
                     16,
                     result_ids2.data(),
                     result_distances2.data());

    next = chrono::high_resolution_clock::now();
    std::cout << "search11: "
              << chrono::duration_cast<chrono::milliseconds>(next - beg).count() << "ms"
              << std::endl;
    beg = next;

    //    std::cout << "case 1" << std::endl;
    //    for (int i = 0; i < 10; ++i) {
    //        std::cout << result_ids[i] << "->" << result_distances[i] << std::endl;
    //    }
    //    std::cout << "case 2" << std::endl;
    //    for (int i = 0; i < 10; ++i) {
    //        std::cout << result_ids2[i] << "->" << result_distances2[i] << std::endl;
    //    }
    //
    //    for (auto x : result_ids2) {
    //        ASSERT_GE(x, 10 * N + N_del);
    //        ASSERT_LT(x, 10 * N + N);
    //    }

    //    auto iter = 0;
    //    for(int i = 0; i < result_ids.size(); ++i) {
    //        auto uid = result_ids[i];
    //        auto dis = result_distances[i];
    //        if(uid >= 10 * N + N_del) {
    //            auto uid2 = result_ids2[iter];
    //            auto dis2 = result_distances2[iter];
    //            ASSERT_EQ(uid, uid2);
    //            ASSERT_EQ(dis, dis2);
    //            ++iter;
    //        }
    //    }

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}

TEST(CApiTest, GetDeletedCountTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);

    long delete_primary_keys[] = {100000, 100001, 100002};
    unsigned long delete_timestamps[] = {0, 0, 0};

    auto offset = PreDelete(segment, 3);

    auto del_res = Delete(segment, offset, 3, delete_primary_keys, delete_timestamps);
    assert(del_res == 0);

    // TODO: assert(deleted_count == len(delete_primary_keys))
    auto deleted_count = GetDeletedCount(segment);
    assert(deleted_count == 0);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}


TEST(CApiTest, GetRowCountTest) {
    auto collection_name = "collection0";
    auto schema_tmp_conf = "";
    auto collection = NewCollection(collection_name, schema_tmp_conf);
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);


    int N = 10000;
    auto [raw_data, timestamps, uids] = generate_data(N);
    auto line_sizeof = (sizeof(int) + sizeof(float) * 16);
    auto offset = PreInsert(segment, N);
    auto res = Insert(segment,
                      offset,
                      N,
                      uids.data(),
                      timestamps.data(),
                      raw_data.data(),
                      (int)line_sizeof,
                      N);
    assert(res == 0);

    auto row_count = GetRowCount(segment);
    assert(row_count == N);

    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}

TEST(CApiTest, SchemaTest) {
    std::string schema_string = "id: 6873737669791618215\nname: \"collection0\"\nschema: \u003c\n  "
                                "field_metas: \u003c\n    field_name: \"age\"\n    type: INT32\n    dim: 1\n  \u003e\n  "
                                "field_metas: \u003c\n    field_name: \"field_1\"\n    type: VECTOR_FLOAT\n    dim: 16\n  \u003e\n"
                                "\u003e\ncreate_time: 1600416765\nsegment_ids: 6873737669791618215\npartition_tags: \"default\"\n";

    auto collection_name = "collection0";
    auto collection = NewCollection(collection_name, schema_string.data());
    auto partition_name = "partition0";
    auto partition = NewPartition(collection, partition_name);
    auto segment = NewSegment(partition, 0);
    DeleteCollection(collection);
    DeletePartition(partition);
    DeleteSegment(segment);
}