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use alloc::string::String;
use alloc::vec::Vec;

#[derive(Clone, Debug)]
pub struct TypeDescription {
    pub docs: &'static [&'static str],
    pub name: String,
    pub contents: TypeContents,
}

impl TypeDescription {
    /// Used as temporary value.
    /// To avoid an infinite loop for recursive types,
    /// we must reserve the type key (type name) before computing its fields.
    /// We use this as value while the fields are being computed.
    pub const PLACEHOLDER: TypeDescription = TypeDescription {
        docs: &[],
        name: String::new(),
        contents: TypeContents::NotSpecified,
    };
}

#[derive(Clone, Debug)]
pub enum TypeContents {
    NotSpecified,
    Enum(Vec<EnumVariantDescription>),
    Struct(Vec<StructFieldDescription>),
}

impl TypeContents {
    pub fn is_specified(&self) -> bool {
        !matches!(*self, TypeContents::NotSpecified)
    }
}

#[derive(Clone, Debug)]
pub struct EnumVariantDescription {
    pub docs: &'static [&'static str],
    pub name: &'static str,
    pub discriminant: usize,
    pub fields: Vec<StructFieldDescription>,
}

#[derive(Clone, Debug)]
pub struct StructFieldDescription {
    pub docs: &'static [&'static str],
    pub name: &'static str,
    pub field_type: String,
}