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//! SignedHeader contains commit and and block header.
//! It is what the rpc endpoint /commit returns and hence can be used by a
//! light client.
use crate::{block, Error, Kind};
use serde::{Deserialize, Serialize};
use std::convert::{TryFrom, TryInto};
use tendermint_proto::types::SignedHeader as RawSignedHeader;

/// Signed block headers
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
#[serde(try_from = "RawSignedHeader", into = "RawSignedHeader")] // used by RPC /commit endpoint
#[non_exhaustive]
pub struct SignedHeader {
    /// Block header
    pub header: block::Header,
    /// Commit containing signatures for the header
    pub commit: block::Commit,
}

impl TryFrom<RawSignedHeader> for SignedHeader {
    type Error = Error;

    fn try_from(value: RawSignedHeader) -> Result<Self, Self::Error> {
        let header = value.header.ok_or(Kind::InvalidSignedHeader)?.try_into()?;
        let commit = value.commit.ok_or(Kind::InvalidSignedHeader)?.try_into()?;
        Self::new(header, commit) // Additional checks
    }
}

impl From<SignedHeader> for RawSignedHeader {
    fn from(value: SignedHeader) -> Self {
        RawSignedHeader {
            header: Some(value.header.into()),
            commit: Some(value.commit.into()),
        }
    }
}

impl SignedHeader {
    /// Constructor.
    pub fn new(header: block::Header, commit: block::Commit) -> Result<Self, Error> {
        if header.height != commit.height {
            return Err(Kind::InvalidSignedHeader.into());
        }
        Ok(Self { header, commit })
    }

    /// Get header
    pub fn header(&self) -> &block::Header {
        &self.header
    }

    /// Get commit
    pub fn commit(&self) -> &block::Commit {
        &self.commit
    }
}