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use ids::{SourceId, TokenId};
use resources::{Card, CardParams, Source};

#[derive(Clone, Debug)]
pub enum PaymentSourceParams<'a> {
    Source(SourceId),
    Token(TokenId),
    Card(CardParams<'a>),
}

impl<'de> ::serde::Deserialize<'de> for PaymentSourceParams<'de> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: ::serde::de::Deserializer<'de>,
    {
        use serde::de::{Deserialize, Error};
        use serde::private::de::{Content, ContentRefDeserializer};

        #[derive(Deserialize)]
        pub struct Any {}

        #[derive(Deserialize)]
        #[serde(tag = "object", rename_all = "snake_case")]
        pub enum PaymentSourceObjectType {
            Card(Any),
        }

        // Try deserializing the untagged variants first
        let content = <Content as Deserialize>::deserialize(deserializer)?;
        let deserializer = ContentRefDeserializer::<D::Error>::new(&content);
        if let Ok(ok) = <SourceId as Deserialize>::deserialize(deserializer) {
            return Ok(PaymentSourceParams::Source(ok));
        }
        let deserializer = ContentRefDeserializer::<D::Error>::new(&content);
        if let Ok(ok) = <TokenId as Deserialize>::deserialize(deserializer) {
            return Ok(PaymentSourceParams::Token(ok));
        }

        // Deserialize just the tag of one of the tagged variants, then deserialize the matching variant
        let deserializer = ContentRefDeserializer::<D::Error>::new(&content);
        match <PaymentSourceObjectType as Deserialize>::deserialize(deserializer) {
            Ok(PaymentSourceObjectType::Card(_)) => {
                let deserializer = ContentRefDeserializer::<D::Error>::new(&content);
                return <CardParams as Deserialize>::deserialize(deserializer)
                    .map(PaymentSourceParams::Card);
            }
            _ => {}
        }

        Err(Error::custom("data did not match any variant of enum PaymentSourceParams"))
    }
}

impl<'a> ::serde::Serialize for PaymentSourceParams<'a> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: ::serde::ser::Serializer,
    {
        #[derive(Serialize)]
        #[serde(tag = "object", rename_all = "snake_case")]
        enum PaymentSourceTagged<'a> {
            Card(&'a CardParams<'a>),
        }

        match self {
            PaymentSourceParams::Source(id) => id.serialize(serializer),
            PaymentSourceParams::Token(id) => id.serialize(serializer),
            PaymentSourceParams::Card(card) => {
                PaymentSourceTagged::Card(card).serialize(serializer)
            }
        }
    }
}

#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(tag = "object", rename_all = "snake_case")]
pub enum PaymentSource {
    Card(Card),
    Source(Source),

    // FIXME: Add `BankAccount` variant after determing which struct is
    //        the correct representation of bank accounts in this context.
}