microledger 0.1.1

use std::{fmt::Display, str::FromStr};

use keri::prefix::{BasicPrefix, Prefix};
use serde::{Deserialize, Deserializer, Serialize, Serializer};

use crate::{error::Error, signature::Signature};

/// Controlling identifier describes control authority over the Microledger in a given block.
/// Control _MAY_ be established for single or multiple identifiers through the multisig feature.
/// Controlling identifiers can be anything that is considered identifiable within given network,
/// ie. `Public Key`, `DID`, `KERI` prefix and so on.
#[derive(Clone, Debug, PartialEq)]
pub enum ControllingIdentifier {
    Basic(BasicPrefix),
}

impl ControllingIdentifier {
    pub fn check_signatures(&self, msg: &[u8], signatures: &[Signature]) -> Result<bool, Error> {
        match self {
            Self::Basic(id) => Ok(signatures
                .iter()
                .any(|s| s.verify_with(msg, &id.public_key.key()).unwrap())),
        }
    }
}

impl Display for ControllingIdentifier {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            ControllingIdentifier::Basic(id) => write!(f, "A{}", id.to_str()),
        }
    }
}

impl FromStr for ControllingIdentifier {
    type Err = keri::error::Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s.get(..1).zip(s.get(1..)) {
            Some(("A", id)) => Ok(Self::Basic(id.parse()?)),
            _ => Err(keri::error::Error::DeserializeError(
                "Unknown prefix".into(),
            )),
        }
    }
}

impl Serialize for ControllingIdentifier {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        serializer.serialize_str(&self.to_string())
    }
}

impl<'de> Deserialize<'de> for ControllingIdentifier {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        String::deserialize(deserializer)?
            .parse()
            .map_err(serde::de::Error::custom)
    }
}