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use std::fmt;
use quickcheck::{Arbitrary, Gen};

use packet;
use Packet;

/// Holds a Trust packet.
///
/// See [Section 5.10 of RFC 4880] for details.
///
///   [Section 5.10 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.10
#[derive(PartialEq, Eq, Hash, Clone)]
pub struct Trust {
    pub(crate) common: packet::Common,
    value: Vec<u8>,
}

impl From<Vec<u8>> for Trust {
    fn from(u: Vec<u8>) -> Self {
        Trust {
            common: Default::default(),
            value: u,
        }
    }
}

impl fmt::Display for Trust {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let trust = String::from_utf8_lossy(&self.value[..]);
        write!(f, "{}", trust)
    }
}

impl fmt::Debug for Trust {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("Trust")
            .field("value", &::conversions::hex::encode(&self.value))
            .finish()
    }
}

impl Trust {
    /// Gets the trust packet's value.
    pub fn value(&self) -> &[u8] {
        self.value.as_slice()
    }
}

impl From<Trust> for Packet {
    fn from(s: Trust) -> Self {
        Packet::Trust(s)
    }
}

impl Arbitrary for Trust {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        Vec::<u8>::arbitrary(g).into()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use parse::Parse;
    use serialize::SerializeInto;

    quickcheck! {
        fn roundtrip(p: Trust) -> bool {
            let q = Trust::from_bytes(&p.to_vec().unwrap()).unwrap();
            assert_eq!(p, q);
            true
        }
    }
}