#include "reader/string_column_reader.hpp"

#include "utf8proc_wrapper.hpp"

#include "parquet_reader.hpp"

#include "duckdb/common/types/blob.hpp"

namespace duckdb {

//===--------------------------------------------------------------------===//

// String Column Reader

//===--------------------------------------------------------------------===//

StringColumnReader::StringColumnReader(const ParquetReader &reader, const ParquetColumnSchema &schema)

    : ColumnReader(reader, schema), string_column_type(GetStringColumnType(Type())) {

  fixed_width_string_length = 0;

  if (schema.parquet_type == Type::FIXED_LEN_BYTE_ARRAY) {

    fixed_width_string_length = schema.type_length;

  }

}

bool StringColumnReader::IsValid(const char *str_data, uint32_t str_len, const bool is_varchar) {

  if (!is_varchar) {

    return true;

  }

  // verify if a string is actually UTF8, and if there are no null bytes in the middle of the string

  // technically Parquet should guarantee this, but reality is often disappointing

  UnicodeInvalidReason reason;

  size_t pos;

  auto utf_type = Utf8Proc::Analyze(str_data, str_len, &reason, &pos);

  return utf_type != UnicodeType::INVALID;

}

bool StringColumnReader::IsValid(const string &str, bool is_varchar) {

  return IsValid(str.c_str(), str.size(), is_varchar);

}

void StringColumnReader::VerifyString(const char *str_data, uint32_t str_len, const bool is_varchar) const {

  if (!IsValid(str_data, str_len, is_varchar)) {

    throw InvalidInputException(

        "Invalid string encoding found in Parquet file \"%s\": value \"%s\" is not valid UTF8!",

        reader.GetFileName(), Blob::ToString(string_t(str_data, str_len)));

  }

}

void StringColumnReader::VerifyString(const char *str_data, uint32_t str_len) const {

  switch (string_column_type) {

  case StringColumnType::VARCHAR:

    VerifyString(str_data, str_len, true);

    break;

  case StringColumnType::JSON: {

    const auto error = StringUtil::ValidateJSON(str_data, str_len);

    if (!error.empty()) {

      throw InvalidInputException("Invalid JSON found in Parquet file: %s", error);

    }

    break;

  }

  default:

    break;

  }

}

class ParquetStringVectorBuffer : public VectorBuffer {

public:

  explicit ParquetStringVectorBuffer(shared_ptr<ResizeableBuffer> buffer_p)

      : VectorBuffer(VectorBufferType::OPAQUE_BUFFER), buffer(std::move(buffer_p)) {

  }

private:

  shared_ptr<ResizeableBuffer> buffer;

};

void StringColumnReader::ReferenceBlock(Vector &result, shared_ptr<ResizeableBuffer> &block) {

  StringVector::AddBuffer(result, make_buffer<ParquetStringVectorBuffer>(block));

}

void StringColumnReader::Plain(shared_ptr<ResizeableBuffer> &plain_data, uint8_t *defines, idx_t num_values,

                               idx_t result_offset, Vector &result) {

  ReferenceBlock(result, plain_data);

  PlainTemplated<string_t, StringParquetValueConversion>(*plain_data, defines, num_values, result_offset, result);

}

void StringColumnReader::PlainSkip(ByteBuffer &plain_data, uint8_t *defines, idx_t num_values) {

  PlainSkipTemplated<StringParquetValueConversion>(plain_data, defines, num_values);

}

void StringColumnReader::PlainSelect(shared_ptr<ResizeableBuffer> &plain_data, uint8_t *defines, idx_t num_values,

                                     Vector &result, const SelectionVector &sel, idx_t count) {

  ReferenceBlock(result, plain_data);

  PlainSelectTemplated<string_t, StringParquetValueConversion>(*plain_data, defines, num_values, result, sel, count);

}

} // namespace duckdb