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//! Subset of WebAuthn types that crept into CTAP.

use crate::sizes::*;
use crate::{Bytes, String};
use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct PublicKeyCredentialRpEntity {
    pub id: String<256>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub name: Option<String<64>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub url: Option<String<64>>,
}

#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct PublicKeyCredentialUserEntity {
    pub id: Bytes<64>,
    #[serde(
        default,
        deserialize_with = "deserialize_from_str_and_skip_if_too_long"
    )]
    #[serde(skip_serializing_if = "Option::is_none")]
    pub icon: Option<String<128>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub name: Option<String<64>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub display_name: Option<String<64>>,
}

fn deserialize_from_str_and_skip_if_too_long<'de, D, const L: usize>(
    deserializer: D,
) -> Result<Option<String<L>>, D::Error>
where
    D: serde::Deserializer<'de>,
{
    let result: Result<String<L>, D::Error> = serde::Deserialize::deserialize(deserializer);
    match result {
        Ok(string) => Ok(Some(string)),
        Err(_err) => {
            info_now!("skipping field: {:?}", _err);
            Ok(None)
        }
    }
}

impl PublicKeyCredentialUserEntity {
    pub fn from(id: Bytes<64>) -> Self {
        Self {
            id,
            icon: None,
            name: None,
            display_name: None,
        }
    }
}

#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct PublicKeyCredentialParameters {
    pub alg: i32,
    #[serde(rename = "type")]
    pub key_type: String<32>,
}

impl PublicKeyCredentialParameters {
    pub fn public_key_with_alg(alg: i32) -> Self {
        Self {
            alg,
            key_type: String::from("public-key"),
        }
    }
}

#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct PublicKeyCredentialDescriptor {
    // NB: if this is too small, get a nasty error
    // See serde::error/custom for more info
    pub id: Bytes<MAX_CREDENTIAL_ID_LENGTH>,
    #[serde(rename = "type")]
    pub key_type: String<32>,
    // https://w3c.github.io/webauthn/#enumdef-authenticatortransport
    // transports: ...
}