#!/usr/bin/env elixir

# Test different encoding approaches for length 224

length = 224

IO.puts("=== Encoding length #{length} ===")

# Option 1: Binary encoding (what hex should produce)
binary_bytes = <<length::16>>
IO.puts("Binary encoding: #{Base.encode16(binary_bytes, case: :upper)} (bytes: #{inspect(binary_bytes)})")

# Option 2: BCD encoding of decimal representation  
decimal_str = Integer.to_string(length) |> String.pad_leading(4, "0")  # "0224"
bcd_bytes = decimal_str
|> String.to_charlist()
|> Enum.chunk_every(2) 
|> Enum.map(fn [hi, lo] -> ((hi - ?0) <<< 4) ||| (lo - ?0) end)
|> :binary.list_to_bin()
IO.puts("BCD encoding of '#{decimal_str}': #{Base.encode16(bcd_bytes, case: :upper)} (bytes: #{inspect(bcd_bytes)})")

# Option 3: ASCII hex string
hex_str = Integer.to_string(length, 16) |> String.upcase() |> String.pad_leading(4, "0")  # "00E0"
IO.puts("ASCII hex string: #{hex_str} (bytes: #{inspect(hex_str)})")

IO.puts("\n=== Your debug message showed ===")
IO.puts("Hex encoded length 224 -> 00E0")
IO.puts("This suggests you want: #{Base.encode16(binary_bytes, case: :upper)} as binary bytes")