# encoding: UTF-8
# frozen_string_literal: true
#
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# 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
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require 'spec_helper'

describe Thrift::Bytes do
  describe '.empty_byte_buffer' do
    it 'should create an empty buffer' do
      b = Thrift::Bytes.empty_byte_buffer
      expect(b.length).to eq(0)
      expect(b.encoding).to eq(Encoding::BINARY)
    end

    it 'should create an empty buffer of given size' do
      b = Thrift::Bytes.empty_byte_buffer 2
      expect(b.length).to eq(2)
      expect(b.getbyte(0)).to eq(0)
      expect(b.getbyte(1)).to eq(0)
      expect(b.encoding).to eq(Encoding::BINARY)
    end
  end

  describe '.force_binary_encoding' do
    it 'should change encoding' do
      e = 'STRING'.encode('UTF-8')
      expect(e.encoding).not_to eq(Encoding::BINARY)
      a = Thrift::Bytes.force_binary_encoding e
      expect(a.encoding).to eq(Encoding::BINARY)
    end

    it 'should return the same frozen binary string unchanged' do
      e = 'STRING'.b.freeze
      a = Thrift::Bytes.force_binary_encoding(e)
      expect(a).to equal(e)
      expect(a.encoding).to eq(Encoding::BINARY)
      expect(a).to be_frozen
    end

    it 'should duplicate a frozen non-binary string before changing encoding' do
      e = 'STRING'.encode('UTF-8').freeze
      a = Thrift::Bytes.force_binary_encoding(e)
      expect(a).not_to equal(e)
      expect(a.encoding).to eq(Encoding::BINARY)
      expect(e.encoding).to eq(Encoding::UTF_8)
      expect(e).to be_frozen
    end
  end

  describe '.get_string_byte' do
    it 'should get the byte at index' do
      s = "\x41\x42"
      expect(Thrift::Bytes.get_string_byte(s, 0)).to eq(0x41)
      expect(Thrift::Bytes.get_string_byte(s, 1)).to eq(0x42)
    end
  end

  describe '.set_string_byte' do
    it 'should set byte value at index' do
      s = "\x41\x42".b
      Thrift::Bytes.set_string_byte(s, 0, 0x43)
      expect(s.getbyte(0)).to eq(0x43)
      expect(s).to eq('CB')
    end
  end

  describe '.convert_to_utf8_byte_buffer' do
    it 'should convert UTF-8 String to byte buffer' do
      e = "\u20AC".encode('UTF-8') # a string with euro sign character U+20AC
      expect(e.length).to eq(1)

      a = Thrift::Bytes.convert_to_utf8_byte_buffer e
      expect(a.encoding).to eq(Encoding::BINARY)
      expect(a.length).to eq(3)
      expect(a.unpack('C*')).to eq([0xE2, 0x82, 0xAC])
    end

    it 'should convert ISO-8859-15 String to UTF-8 byte buffer' do
      # Assumptions
      e = "\u20AC".encode('ISO-8859-15') # a string with euro sign character U+20AC, then converted to ISO-8859-15
      expect(e.length).to eq(1)
      expect(e.unpack('C*')).to eq([0xA4]) # euro sign is a different code point in ISO-8859-15

      a = Thrift::Bytes.convert_to_utf8_byte_buffer e
      expect(a.encoding).to eq(Encoding::BINARY)
      expect(a.length).to eq(3)
      expect(a.unpack('C*')).to eq([0xE2, 0x82, 0xAC])
    end
  end

  describe '.convert_to_string' do
    it 'should convert UTF-8 byte buffer to a UTF-8 String' do
      e = [0xE2, 0x82, 0xAC].pack("C*")
      expect(e.encoding).to eq(Encoding::BINARY)
      a = Thrift::Bytes.convert_to_string e
      expect(a.encoding).to eq(Encoding::UTF_8)
      expect(a).to eq("\u20AC")
    end
  end
end