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use crate::{impl_scalar_internal, Result, Scalar, Value};
use itertools::Itertools;

/// Any scalar
///
/// The `Any` scalar is used to pass representations of entities from external services into the root `_entities` field for execution.
#[derive(Clone, PartialEq, Debug)]
pub struct Any(pub Value);

impl Scalar for Any {
    fn type_name() -> &'static str {
        "_Any"
    }

    fn description() -> Option<&'static str> {
        Some("The `_Any` scalar is used to pass representations of entities from external services into the root `_entities` field for execution.")
    }

    fn parse(value: &Value) -> Option<Self> {
        Some(Self(value.clone()))
    }

    fn is_valid(_value: &Value) -> bool {
        true
    }

    fn to_json(&self) -> Result<serde_json::Value> {
        Ok(gql_value_to_json_value(&self.0))
    }
}

impl_scalar_internal!(Any);

fn gql_value_to_json_value(value: &Value) -> serde_json::Value {
    match value {
        Value::Null => serde_json::Value::Null,
        Value::Variable(name) => name.clone().into(),
        Value::Int(n) => n.as_i64().unwrap().into(),
        Value::Float(n) => (*n).into(),
        Value::String(s) => s.clone().into(),
        Value::Boolean(v) => (*v).into(),
        Value::Enum(e) => e.clone().into(),
        Value::List(values) => values
            .iter()
            .map(|value| gql_value_to_json_value(value))
            .collect_vec()
            .into(),
        Value::Object(obj) => serde_json::Value::Object(
            obj.iter()
                .map(|(k, v)| (k.clone(), gql_value_to_json_value(v)))
                .collect(),
        ),
    }
}