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use super::{fmt, Digest};

// PROXY BLOCK
// ================================================================================================
/// A code block used to conceal a part of a program.
///
/// Proxy blocks cannot be executed by the VM. They are used primarily to verify the integrity of
/// a program's hash while keeping parts of the program secret.
///
/// Hash of a proxy block is not computed but is rather defined at instantiation time.
#[derive(Clone, Debug)]
pub struct Proxy {
    hash: Digest,
}

impl Proxy {
    /// Returns a new [Proxy] block instantiated with the specified code hash.
    pub fn new(code_hash: Digest) -> Self {
        Self { hash: code_hash }
    }

    /// Returns a hash of this code block.
    pub fn hash(&self) -> Digest {
        self.hash
    }
}

impl fmt::Display for Proxy {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "proxy.{:?}", self.hash) // TODO: use hex, change formatting
    }
}