// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
 * Copyright 2011 ZXing authors
 *
 * Licensed 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 "fxbarcode/oned/BC_OnedCodaBarWriter.h"

#include <array>
#include <iterator>

#include "core/fxcrt/containers/contains.h"
#include "core/fxcrt/fx_2d_size.h"
#include "core/fxcrt/fx_extension.h"
#include "fxbarcode/BC_Writer.h"
#include "fxbarcode/oned/BC_OneDimWriter.h"

namespace {

constexpr auto kOnedCodaAlphabet = std::to_array<const char>(
    {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-',
     '$', ':', '/', '.', '+', 'A', 'B', 'C', 'D', 'T', 'N'});
static_assert(std::size(kOnedCodaAlphabet) == 22, "Wrong size");

constexpr auto kOnedCodaCharacterEncoding = std::to_array<const int8_t>(
    {0x03, 0x06, 0x09, 0x60, 0x12, 0x42, 0x21, 0x24, 0x30, 0x48, 0x0c,
     0x18, 0x45, 0x51, 0x54, 0x15, 0x1A, 0x29, 0x0B, 0x0E, 0x1A, 0x29});
static_assert(std::size(kOnedCodaCharacterEncoding) == 22, "Wrong size");

const char kStartEndChars[] = {'A', 'B', 'C', 'D', 'T', 'N', '*', 'E',
                               'a', 'b', 'c', 'd', 't', 'n', 'e'};
const char kContentChars[] = {'0', '1', '2', '3', '4', '5', '6', '7',
                              '8', '9', '-', '$', '/', ':', '+', '.'};

bool IsValidChar(wchar_t ch, bool isContent) {
  if (ch > 0x7F) {
    return false;
  }

  char narrow_ch = static_cast<char>(ch);
  return pdfium::Contains(kContentChars, narrow_ch) ||
         (isContent && pdfium::Contains(kStartEndChars, narrow_ch));
}

}  // namespace

CBC_OnedCodaBarWriter::CBC_OnedCodaBarWriter() = default;

CBC_OnedCodaBarWriter::~CBC_OnedCodaBarWriter() = default;

bool CBC_OnedCodaBarWriter::SetStartChar(char start) {
  if (!pdfium::Contains(kStartEndChars, start)) {
    return false;
  }

  ch_start_ = start;
  return true;
}

bool CBC_OnedCodaBarWriter::SetEndChar(char end) {
  if (!pdfium::Contains(kStartEndChars, end)) {
    return false;
  }

  ch_end_ = end;
  return true;
}

void CBC_OnedCodaBarWriter::SetDataLength(int32_t length) {
  data_length_ = length + 2;
}

void CBC_OnedCodaBarWriter::SetTextLocation(BC_TEXT_LOC location) {
  loc_text_loc_ = location;
}

bool CBC_OnedCodaBarWriter::SetWideNarrowRatio(int8_t ratio) {
  if (ratio < 2 || ratio > 3) {
    return false;
  }

  wide_narr_ratio_ = ratio;
  return true;
}

bool CBC_OnedCodaBarWriter::CheckContentValidity(WideStringView contents) {
  return HasValidContentSize(contents) &&
         std::all_of(contents.begin(), contents.end(),
                     [](const wchar_t& ch) { return IsValidChar(ch, false); });
}

WideString CBC_OnedCodaBarWriter::FilterContents(WideStringView contents) {
  WideString filtercontents;
  filtercontents.Reserve(contents.GetLength());
  wchar_t ch;
  for (size_t index = 0; index < contents.GetLength(); index++) {
    ch = contents[index];
    if (ch > 175) {
      index++;
      continue;
    }
    if (!IsValidChar(ch, true)) {
      continue;
    }
    filtercontents += ch;
  }
  return filtercontents;
}

DataVector<uint8_t> CBC_OnedCodaBarWriter::Encode(const ByteString& contents) {
  ByteString data = ch_start_ + contents + ch_end_;
  content_len_ = data.GetLength();
  DataVector<uint8_t> result(
      Fx2DSizeOrDie(wide_narr_ratio_ * 7, data.GetLength()));
  char ch;
  int32_t position = 0;
  for (size_t index = 0; index < data.GetLength(); index++) {
    ch = FXSYS_ToUpperASCII(data[index]);
    switch (ch) {
      case 'T':
        ch = 'A';
        break;
      case 'N':
        ch = 'B';
        break;
      case '*':
        ch = 'C';
        break;
      case 'E':
        ch = 'D';
        break;
      default:
        break;
    }
    int8_t code = 0;
    for (size_t i = 0; i < std::size(kOnedCodaAlphabet); i++) {
      if (ch == kOnedCodaAlphabet[i]) {
        code = kOnedCodaCharacterEncoding[i];
        break;
      }
    }
    uint8_t color = 1;
    int32_t counter = 0;
    int32_t bit = 0;
    while (bit < 7) {
      result[position] = color;
      position++;
      if (((code >> (6 - bit)) & 1) == 0 || counter == wide_narr_ratio_ - 1) {
        color = !color;
        bit++;
        counter = 0;
      } else {
        counter++;
      }
    }
    if (index < data.GetLength() - 1) {
      result[position] = 0;
      position++;
    }
  }
  result.resize(position);
  return result;
}

WideString CBC_OnedCodaBarWriter::encodedContents(WideStringView contents) {
  WideString strStart(static_cast<wchar_t>(ch_start_));
  WideString strEnd(static_cast<wchar_t>(ch_end_));
  return strStart + contents + strEnd;
}

bool CBC_OnedCodaBarWriter::RenderResult(WideStringView contents,
                                         pdfium::span<const uint8_t> code) {
  return CBC_OneDimWriter::RenderResult(
      encodedContents(contents).AsStringView(), code);
}