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use darling::util::SpannedValue;
use proc_macro2::Span;

use crate::ident::RenameAll;

#[derive(darling::FromDeriveInput)]
#[darling(attributes(cynic), supports(enum_unit))]
pub struct EnumDeriveInput {
    pub(super) ident: proc_macro2::Ident,
    pub(super) data: darling::ast::Data<EnumDeriveVariant, ()>,

    pub schema_path: SpannedValue<String>,

    // query_module is deprecated, remove eventually.
    #[darling(default)]
    query_module: Option<SpannedValue<String>>,
    #[darling(default, rename = "schema_module")]
    schema_module_: Option<SpannedValue<String>>,

    #[darling(default)]
    pub graphql_type: Option<SpannedValue<String>>,

    #[darling(default)]
    pub(super) rename_all: Option<RenameAll>,
}

impl EnumDeriveInput {
    pub fn schema_module(&self) -> SpannedValue<String> {
        if let Some(schema_module) = &self.schema_module_ {
            return schema_module.clone();
        }
        if let Some(query_module) = &self.query_module {
            return query_module.clone();
        }

        SpannedValue::new("schema".into(), Span::call_site())
    }
}

#[derive(Debug, darling::FromVariant)]
#[darling(attributes(cynic))]
pub struct EnumDeriveVariant {
    pub(super) ident: proc_macro2::Ident,

    #[darling(default)]
    pub(super) rename: Option<SpannedValue<String>>,
}

impl EnumDeriveInput {
    pub fn graphql_type_name(&self) -> String {
        self.graphql_type
            .as_ref()
            .map(|sp| sp.to_string())
            .unwrap_or_else(|| self.ident.to_string())
    }

    pub fn graphql_type_span(&self) -> Span {
        self.graphql_type
            .as_ref()
            .map(|val| val.span())
            .unwrap_or_else(|| self.ident.span())
    }
}