class RedisClient::RubyConnection::BufferedIO

def close
  @io.to_io.close
end

def closed?
  @io.to_io.closed?
end

def ensure_line
uffer(false) if @offset >= @buffer.bytesize
@buffer.byteindex(EOL, @offset)
_buffer(false)

def ensure_line
uffer(false) if @offset >= @buffer.bytesize
@buffer.index(EOL, @offset)
_buffer(false)

def ensure_remaining(bytes)
  needed = bytes - (@buffer.bytesize - @offset)
  if needed > 0
    fill_buffer(true, needed)
  end
end

def eof?
  @offset >= @buffer.bytesize && @io.eof?
end

def fill_buffer(strict, size = @chunk_size)
  remaining = size
  buffer_size = @buffer.bytesize
  start = @offset - buffer_size
  empty_buffer = start >= 0
  loop do
    bytes = if empty_buffer
      @io.read_nonblock([remaining, @chunk_size].max, @buffer, exception: false)
    else
      @io.read_nonblock([remaining, @chunk_size].max, exception: false)
    end
    case bytes
    when :wait_readable
      # Ref: https://github.com/redis-rb/redis-client/issues/190
      # SSLSocket always clear the provided buffer, even when it didn't
      # read anything. So we need to reset the offset accordingly.
      if empty_buffer && @buffer.empty?
        @offset -= buffer_size
      end
      unless @io.to_io.wait_readable(@read_timeout)
        raise ReadTimeoutError, "Waited #{@read_timeout} seconds" unless @blocking_reads
      end
    when :wait_writable
      # Ref: https://github.com/redis-rb/redis-client/issues/190
      # SSLSocket always clear the provided buffer, even when it didn't
      # read anything. So we need to reset the offset accordingly.
      if empty_buffer && @buffer.empty?
        @offset -= buffer_size
      end
      @io.to_io.wait_writable(@write_timeout) or raise(WriteTimeoutError, "Waited #{@write_timeout} seconds")
    when nil
      raise EOFError
    else
      if empty_buffer
        @offset = start
        empty_buffer = false
        @buffer.force_encoding(ENCODING) unless @buffer.encoding == ENCODING
      else
        @buffer << bytes.force_encoding(ENCODING)
      end
      remaining -= bytes.bytesize
      return if !strict || remaining <= 0
    end
  end
end

def getbyte
  unless byte = @buffer.getbyte(@offset)
    ensure_remaining(1)
    byte = @buffer.getbyte(@offset)
  end
  @offset += 1
  byte
end

def gets_chomp
  fill_buffer(false) if @offset >= @buffer.bytesize
  until eol_index = @buffer.byteindex(EOL, @offset)
    fill_buffer(false)
  end
  line = @buffer.byteslice(@offset, eol_index - @offset)
  @offset = eol_index + EOL_SIZE
  line
end

def gets_chomp
  fill_buffer(false) if @offset >= @buffer.bytesize
  until eol_index = @buffer.index(EOL, @offset)
    fill_buffer(false)
  end
  line = @buffer.byteslice(@offset, eol_index - @offset)
  @offset = eol_index + EOL_SIZE
  line
end

def gets_integer
  int = 0
  offset = @offset
  while true
    chr = @buffer.getbyte(offset)
    if chr
      if chr == 13 # "\r".ord
        @offset = offset + 2
        break
      else
        int = (int * 10) + chr - 48
      end
      offset += 1
    else
      ensure_line
      return gets_integer
    end
  end
  int
end

def initialize(io, read_timeout:, write_timeout:, chunk_size: 4096)
  @io = io
  @buffer = +""
  @offset = 0
  @chunk_size = chunk_size
  @read_timeout = read_timeout
  @write_timeout = write_timeout
  @blocking_reads = false
end

def initialize(io, read_timeout:, write_timeout:, chunk_size: 4096)
  @io = io
  @buffer = "".b
  @offset = 0
  @chunk_size = chunk_size
  @read_timeout = read_timeout
  @write_timeout = write_timeout
  @blocking_reads = false
end

def read_chomp(bytes)
  ensure_remaining(bytes + EOL_SIZE)
  str = @buffer.byteslice(@offset, bytes)
  @offset += bytes + EOL_SIZE
  str
end

def read_chomp(bytes)
  ensure_remaining(bytes + EOL_SIZE)
  str = @buffer.byteslice(@offset, bytes)
  @offset += bytes + EOL_SIZE
  str.force_encoding(Encoding::UTF_8)
end

def skip(offset)
  ensure_remaining(offset)
  @offset += offset
  nil
end

def with_timeout(new_timeout)
  new_timeout = false if new_timeout == 0
  previous_read_timeout = @read_timeout
  previous_blocking_reads = @blocking_reads
  if new_timeout
    @read_timeout = new_timeout
  else
    @blocking_reads = true
  end
  begin
    yield
  ensure
    @read_timeout = previous_read_timeout
    @blocking_reads = previous_blocking_reads
  end
end

def write(string)
  total = remaining = string.bytesize
  loop do
    case bytes_written = @io.write_nonblock(string, exception: false)
    when Integer
      remaining -= bytes_written
      if remaining > 0
        string = string.byteslice(bytes_written..-1)
      else
        return total
      end
    when :wait_readable
      @io.to_io.wait_readable(@read_timeout) or raise(ReadTimeoutError, "Waited #{@read_timeout} seconds")
    when :wait_writable
      @io.to_io.wait_writable(@write_timeout) or raise(WriteTimeoutError, "Waited #{@write_timeout} seconds")
    when nil
      raise Errno::ECONNRESET
    else
      raise "Unexpected `write_nonblock` return: #{bytes.inspect}"
    end
  end
end