// Copyright (c) 2017-2022 Cloudflare, Inc.
// Licensed under the Apache 2.0 license found in the LICENSE file or at:
//     https://opensource.org/licenses/Apache-2.0
#pragma once

#include <workerd/jsg/jsg.h>

#include <kj/common.h>
#include <kj/string.h>

#include <cstdint>

struct UConverter;

namespace workerd::api::node {

using EncodingValue = uint8_t;

enum Encoding : EncodingValue {
  ASCII = 0,
  LATIN1 = 1,
  UTF8 = 2,
  UTF16LE = 3,
  BASE64 = 4,
  BASE64URL = 5,
  HEX = 6,
};

namespace i18n {

// Used by BufferUtil::transcode.
constexpr bool canBeTranscoded(Encoding encoding) noexcept {
  switch (encoding) {
    case Encoding::ASCII:
    case Encoding::LATIN1:
    case Encoding::UTF16LE:
    case Encoding::UTF8:
      return true;
    default:
      return false;
  }
}

class Converter final {
 public:
  explicit Converter(Encoding encoding, kj::StringPtr substitude = ""_kj);
  KJ_DISALLOW_COPY_AND_MOVE(Converter);

  UConverter* conv() const;
  size_t maxCharSize() const;
  size_t minCharSize() const;
  void reset();
  void setSubstituteChars(kj::StringPtr sub);

 private:
  kj::Own<UConverter> conv_;
};

jsg::JsUint8Array transcode(
    jsg::Lock& js, kj::ArrayPtr<kj::byte> source, Encoding fromEncoding, Encoding toEncoding);

}  // namespace i18n

}  // namespace workerd::api::node

KJ_DECLARE_NON_POLYMORPHIC(UConverter)