use {
  super::*,
  bitcoin::blockdata::{
    opcodes,
    script::{self, Instruction, Instructions},
  },
};

pub(crate) const PROTOCOL_ID: [u8; 3] = *b"ord";

pub(crate) const BODY_TAG: [u8; 0] = [];
pub(crate) const CONTENT_TYPE_TAG: [u8; 1] = [1];
pub(crate) const POINTER_TAG: [u8; 1] = [2];
pub(crate) const PARENT_TAG: [u8; 1] = [3];
pub(crate) const METADATA_TAG: [u8; 1] = [5];
pub(crate) const METAPROTOCOL_TAG: [u8; 1] = [7];
pub(crate) const CONTENT_ENCODING_TAG: [u8; 1] = [9];

type Result<T> = std::result::Result<T, script::Error>;
type RawEnvelope = Envelope<Vec<Vec<u8>>>;
pub(crate) type ParsedEnvelope = Envelope<Inscription>;

#[derive(Debug, Default, PartialEq, Clone)]
pub(crate) struct Envelope<T> {
  pub(crate) payload: T,
  pub(crate) input: u32,
  pub(crate) offset: u32,
  pub(crate) pushnum: bool,
}

fn remove_field(fields: &mut BTreeMap<&[u8], Vec<&[u8]>>, field: &[u8]) -> Option<Vec<u8>> {
  let values = fields.get_mut(field)?;

  if values.is_empty() {
    None
  } else {
    let value = values.remove(0).to_vec();