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use crate::{
    registry, ContextSelectionSet, ErrorWithPosition, GQLObject, GQLOutputValue, GQLType,
    QueryError, Result,
};
use std::borrow::Cow;

pub struct GQLEmptyMutation;

impl GQLType for GQLEmptyMutation {
    fn type_name() -> Cow<'static, str> {
        Cow::Borrowed("EmptyMutation")
    }

    fn create_type_info(registry: &mut registry::Registry) -> String {
        registry.create_type(&Self::type_name(), |_| registry::Type::Object {
            name: "EmptyMutation",
            description: None,
            fields: Vec::new(),
        })
    }
}

#[async_trait::async_trait]
impl GQLOutputValue for GQLEmptyMutation {
    async fn resolve(&self, ctx: &ContextSelectionSet<'_>) -> Result<serde_json::Value> {
        anyhow::bail!(QueryError::NotConfiguredMutations.with_position(ctx.item.span.0));
    }
}

impl GQLObject for GQLEmptyMutation {}