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use crate::std_types::RStr;

////////////////////////////////////////////////////////////////////////////////

/// Whether a field is accessible,and how it is accessed.
#[repr(u8)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, StableAbi)]
#[sabi(unsafe_sabi_opaque_fields)]
pub enum FieldAccessor {
    /// Accessible with `self.field_name`
    Direct,
    /// Accessible with `fn field_name(&self)->FieldType`
    Method,
    /// Accessible with `fn name(&self)->FieldType`
    MethodNamed {
        ///
        name: RStr<'static>,
    },
    /// Accessible with `fn field_name(&self)->Option<FieldType>`
    MethodOption,
    /// This field is completely inaccessible.
    Opaque,
}

impl FieldAccessor {
    /// Constructs a FieldAccessor for a method named `name`.
    pub const fn method_named(name: RStr<'static>) -> Self {
        FieldAccessor::MethodNamed { name }
    }
}

////////////////////////////////////////////////////////////////////////////////

abi_stable_shared::declare_comp_field_accessor! {
    attrs=[
        derive(StableAbi),
        sabi(unsafe_sabi_opaque_fields),
    ]
}

impl CompFieldAccessor {
    /// Expands this `CompFieldAccessor` into a `FieldAccessor`,
    /// using the string slice contained in the `SharedVars` of
    /// the `TypeLayout` this is stored inside of.
    pub const fn expand(self, string: &'static str) -> Option<FieldAccessor> {
        Some(match self {
            Self::DIRECT => FieldAccessor::Direct,
            Self::METHOD => FieldAccessor::Method,
            Self::METHOD_NAMED => FieldAccessor::MethodNamed {
                name: RStr::from_str(string),
            },
            Self::METHOD_OPTION => FieldAccessor::MethodOption,
            Self::OPAQUE => FieldAccessor::Opaque,
            _ => return None,
        })
    }
}

////////////////////////////////////////////////////////////////////////////////