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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#include "libmexclass/proxy/ProxyManager.h"

#include "arrow/matlab/error/error.h"
#include "arrow/matlab/io/csv/proxy/table_reader.h"
#include "arrow/matlab/tabular/proxy/table.h"

#include "arrow/util/utf8.h"

#include "arrow/result.h"

#include "arrow/csv/reader.h"
#include "arrow/io/file.h"
#include "arrow/io/interfaces.h"
#include "arrow/table.h"

namespace arrow::matlab::io::csv::proxy {

TableReader::TableReader(const std::string& filename) : filename{filename} {
  REGISTER_METHOD(TableReader, read);
  REGISTER_METHOD(TableReader, getFilename);
}

libmexclass::proxy::MakeResult TableReader::make(
    const libmexclass::proxy::FunctionArguments& constructor_arguments) {
  namespace mda = ::matlab::data;
  using TableReaderProxy = arrow::matlab::io::csv::proxy::TableReader;

  mda::StructArray args = constructor_arguments[0];
  const mda::StringArray filename_utf16_mda = args[0]["Filename"];
  const auto filename_utf16 = std::u16string(filename_utf16_mda[0]);
  MATLAB_ASSIGN_OR_ERROR(const auto filename,
                         arrow::util::UTF16StringToUTF8(filename_utf16),
                         error::UNICODE_CONVERSION_ERROR_ID);

  return std::make_shared<TableReaderProxy>(filename);
}

void TableReader::read(libmexclass::proxy::method::Context& context) {
  namespace mda = ::matlab::data;
  using namespace libmexclass::proxy;
  namespace csv = ::arrow::csv;
  using TableProxy = arrow::matlab::tabular::proxy::Table;

  mda::ArrayFactory factory;

  // Create a file input stream.
  MATLAB_ASSIGN_OR_ERROR_WITH_CONTEXT(
      auto source, arrow::io::ReadableFile::Open(filename, arrow::default_memory_pool()),
      context, error::FAILED_TO_OPEN_FILE_FOR_READ);

  const ::arrow::io::IOContext io_context;
  const auto read_options = csv::ReadOptions::Defaults();
  const auto parse_options = csv::ParseOptions::Defaults();
  const auto convert_options = csv::ConvertOptions::Defaults();

  // Create a TableReader from the file input stream.
  MATLAB_ASSIGN_OR_ERROR_WITH_CONTEXT(
      auto table_reader,
      csv::TableReader::Make(io_context, source, read_options, parse_options,
                             convert_options),
      context, error::CSV_FAILED_TO_CREATE_TABLE_READER);

  // Read a Table from the file.
  MATLAB_ASSIGN_OR_ERROR_WITH_CONTEXT(const auto table, table_reader->Read(), context,
                                      error::CSV_FAILED_TO_READ_TABLE);

  auto table_proxy = std::make_shared<TableProxy>(table);
  const auto table_proxy_id = ProxyManager::manageProxy(table_proxy);

  const auto table_proxy_id_mda = factory.createScalar(table_proxy_id);

  context.outputs[0] = table_proxy_id_mda;
}

void TableReader::getFilename(libmexclass::proxy::method::Context& context) {
  namespace mda = ::matlab::data;
  mda::ArrayFactory factory;

  MATLAB_ASSIGN_OR_ERROR_WITH_CONTEXT(const auto filename_utf16,
                                      arrow::util::UTF8StringToUTF16(filename), context,
                                      error::UNICODE_CONVERSION_ERROR_ID);
  auto filename_utf16_mda = factory.createScalar(filename_utf16);
  context.outputs[0] = filename_utf16_mda;
}

}  // namespace arrow::matlab::io::csv::proxy
