// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License 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.

#include "kudu/integration-tests/data_gen_util.h"

#include <ostream>

#include <glog/logging.h>

#include "kudu/client/schema.h"
#include "kudu/common/partial_row.h"
#include "kudu/gutil/strings/numbers.h"
#include "kudu/util/random.h" // IWYU pragma: keep
#include "kudu/util/status.h"

namespace kudu {

void WriteValueToColumn(const client::KuduSchema& schema,
                        int col_idx,
                        uint64_t value,
                        KuduPartialRow* row) {
  client::KuduColumnSchema::DataType type = schema.Column(col_idx).type();
  char buf[kFastToBufferSize];
  switch (type) {
    case client::KuduColumnSchema::INT8:
      CHECK_OK(row->SetInt8(col_idx, value));
      break;
    case client::KuduColumnSchema::INT16:
      CHECK_OK(row->SetInt16(col_idx, value));
      break;
    case client::KuduColumnSchema::INT32:
      CHECK_OK(row->SetInt32(col_idx, value));
      break;
    case client::KuduColumnSchema::INT64:
      CHECK_OK(row->SetInt64(col_idx, value));
      break;
    case client::KuduColumnSchema::FLOAT:
      CHECK_OK(row->SetFloat(col_idx, value / 123.0));
      break;
    case client::KuduColumnSchema::DOUBLE:
      CHECK_OK(row->SetDouble(col_idx, value / 123.0));
      break;
    case client::KuduColumnSchema::STRING:
      CHECK_OK(row->SetStringCopy(col_idx, FastHex64ToBuffer(value, buf)));
      break;
    case client::KuduColumnSchema::BOOL:
      CHECK_OK(row->SetBool(col_idx, value));
      break;
    case client::KuduColumnSchema::BINARY:
      CHECK_OK(row->SetBinaryCopy(col_idx, FastHex64ToBuffer(value, buf)));
      break;
    case client::KuduColumnSchema::UNIXTIME_MICROS:
      CHECK_OK(row->SetUnixTimeMicros(col_idx, value));
      break;
    case client::KuduColumnSchema::DATE:
      CHECK_OK(row->SetDate(col_idx, value));
      break;
    case client::KuduColumnSchema::DECIMAL:
      CHECK_OK(row->SetUnscaledDecimal(col_idx, value));
      break;
    default:
      LOG(FATAL) << "Unexpected data type: " << type;
  }
}

template <class RNG>
void GenerateDataForRow(const client::KuduSchema& schema, uint64_t record_id,
                        RNG* random, KuduPartialRow* row) {
  for (int col_idx = 0; col_idx < schema.num_columns(); col_idx++) {
    // We randomly generate the inserted data, except for the first column,
    // which is always based on a monotonic "record id".
    uint64_t value;
    if (col_idx == 0) {
      value = record_id;
    } else {
      value = random->Next64();
    }
    WriteValueToColumn(schema, col_idx, value, row);
  }
}

template <class RNG>
void GenerateDataForRow(const client::KuduSchema& schema,
                        RNG* random, KuduPartialRow* row) {
  GenerateDataForRow(schema, random->Next64(), random, row);
}

// Explicit specialization for callers outside this compilation unit.
template
void GenerateDataForRow(const client::KuduSchema& schema, uint64_t record_id,
                        Random* random, KuduPartialRow* row);
template
void GenerateDataForRow(const client::KuduSchema& schema, uint64_t record_id,
                        ThreadSafeRandom* random, KuduPartialRow* row);
template
void GenerateDataForRow(const client::KuduSchema& schema,
                        Random* random, KuduPartialRow* row);
template
void GenerateDataForRow(const client::KuduSchema& schema,
                        ThreadSafeRandom* random, KuduPartialRow* row);

} // namespace kudu