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use crate::generator::rust::generate_import;
use crate::generator::rust::ty::*;
use crate::ir::*;
use crate::target::Acc;
use crate::type_rust_generator_struct;

type_rust_generator_struct!(TypeOptionalGenerator, IrTypeOptional);

impl TypeRustGeneratorTrait for TypeOptionalGenerator<'_> {
    fn wire2api_body(&self) -> Acc<Option<String>> {
        Acc {
            wasm: if self.ir.inner.is_js_value() {
                Some("(!self.is_undefined() && !self.is_null()).then(|| self.wire2api())".into())
            } else if self.ir.is_primitive() || self.ir.is_boxed_primitive() {
                None
            } else {
                Some("self.map(Wire2Api::wire2api)".into())
            },
            ..Default::default()
        }
    }

    fn wire2api_jsvalue(&self) -> Option<std::borrow::Cow<str>> {
        (!self.ir.inner.is_js_value())
            .then(|| "(!self.is_undefined() && !self.is_null()).then(|| self.wire2api())".into())
    }

    fn convert_to_dart(&self, obj: String) -> String {
        let inner = TypeRustGenerator::new(
            *self.ir.inner.clone(),
            self.context.ir_file,
            self.context.config,
        );
        let obj = match inner.wrapper_struct() {
            // An architecture has been created so that the inner type of optional field is always
            // IrTypeBoxed. Here, too, if we use inner.self_access("v".to_owned()), since it will go to
            // self_access in TypeBoxedGenerator, the dereferenced value *v was returned from there, which
            // gave the error that the external struct could not be dereferenced.
            //
            // For now, removed the parameter inner.self_access("v".to_owned()) and then added a bit of a
            // hacky method here (not used self_access function), as it only covers mirrored optional fields.
            Some(wrapper) => format!("{}.map(|v| {}(v))", obj, wrapper),
            None => obj,
        };
        format!("{obj}.into_dart()")
    }

    fn imports(&self) -> Option<String> {
        generate_import(&self.ir.inner, self.context.ir_file, self.context.config)
    }
}