use std::convert::{From, TryFrom};
use std::fmt;
use std::str::FromStr;

use serde_with::{DeserializeFromStr, SerializeDisplay};

#[derive(Debug, Clone, PartialEq, DeserializeFromStr, SerializeDisplay)]
/// DER-encoded X.509, like rustls::Certificate.
pub struct Certificate(Vec<u8>);

impl FromStr for Certificate {
    type Err = pem::PemError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(Certificate(pem::parse(s)?.into_contents()))
    }
}

impl fmt::Display for Certificate {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        pem::Pem::new("CERTIFICATE", self.0.clone()).fmt(f)
    }
}

impl TryFrom<&openssl::x509::X509Ref> for Certificate {
    type Error = openssl::error::ErrorStack;

    fn try_from(c: &openssl::x509::X509Ref) -> Result<Self, Self::Error> {
        Ok(Certificate(c.to_der()?))
    }
}

impl TryFrom<&Certificate> for openssl::x509::X509 {
    type Error = openssl::error::ErrorStack;

    fn try_from(c: &Certificate) -> Result<Self, Self::Error> {
        openssl::x509::X509::from_der(&c.0)
    }
}

impl From<Certificate> for rustls::Certificate {
    fn from(c: Certificate) -> Self {
        rustls::Certificate(c.0)
    }
}