use bls12_381 as bls;
use serde::{Deserialize, Serialize};

struct Foo {
    x: bls::Scalar,
}

#[derive(Serialize, Deserialize, Debug)]
struct FooObject {
    x: String,
}

fn from_slice(bytes: &[u8]) -> [u8; 32] {
    let mut array = [0; 32];
    let bytes = &bytes[..array.len()]; // panics if not enough data
    array.copy_from_slice(bytes);
    array
}

trait FromString {
    fn from_string(string: &str) -> Self;
}

impl FromString for bls::Scalar {
    fn from_string(string: &str) -> Self {
        let bytes = from_slice(&hex::decode(string).unwrap());
        Self::from_bytes(&bytes).unwrap()
    }
}

impl Foo {
    fn to_string(&self) -> String {
        let object = FooObject {
            x: hex::encode(self.x.to_bytes()),
        };
        serde_json::to_string(&object).unwrap()
    }

    fn from_string(&self, serialized: &str) -> Self {
        let object: FooObject = serde_json::from_str(&serialized).unwrap();
        Self {
            x: bls::Scalar::from_string(&object.x),
        }
    }
}

/*
impl Serialize for Foo {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let bytes = self.x.to_bytes();
        let mut state = serializer.serialize_struct("Foo", 1)?;
        state.serialize_field("x", &bytes);
        state.end()
    }
}
*/

fn main() {
    let foo = Foo {
        x: bls::Scalar::one(),
    };

    //let serialized = serde_json::to_string(&foo).unwrap();
    //println!("serialized = {}", serialized);

    let x = foo.to_string();
    println!("done {}", x);
}