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use crate::{Scalar, SerializeError};

pub struct Argument {
    pub(crate) name: String,
    pub(crate) value: Box<dyn SerializableArgument + Send>,
    pub(crate) type_: String,
}

impl Argument {
    pub fn new(
        name: &str,
        gql_type: &str,
        value: impl SerializableArgument + 'static + Send,
    ) -> Argument {
        Argument {
            name: name.to_string(),
            value: Box::new(value),
            type_: gql_type.to_string(),
        }
    }
}

impl serde::Serialize for Argument {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        use serde::ser::Error;

        match self.value.serialize() {
            Ok(json_val) => serde::Serialize::serialize(&json_val, serializer),
            Err(e) => Err(S::Error::custom(e.to_string())),
        }
    }
}

pub trait SerializableArgument {
    fn serialize(&self) -> Result<serde_json::Value, SerializeError>;
}

impl<T: SerializableArgument> SerializableArgument for Vec<T> {
    fn serialize(&self) -> Result<serde_json::Value, SerializeError> {
        self.iter()
            .map(|s| s.serialize())
            .collect::<Result<Vec<_>, _>>()
            .map(serde_json::Value::Array)
    }
}

impl<T: SerializableArgument> SerializableArgument for Option<T> {
    fn serialize(&self) -> Result<serde_json::Value, SerializeError> {
        match self {
            Some(inner) => Ok(inner.serialize()?),
            None => Ok(serde_json::Value::Null),
        }
    }
}

impl<T: Scalar> SerializableArgument for T {
    fn serialize(&self) -> Result<serde_json::Value, SerializeError> {
        self.encode()
    }
}