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//!
//! Derive For the traits `See` and an extension trait `Load`
//! [see-through][parent-crate]
//!
//!
//!
//! [parent-crate]: https://github.com/NishantJoshi00/see-through
//!
#![doc = include_str!(concat!(env!("CARGO_MANIFEST_DIR" ), "/", "README.md"))]

use proc_macro::TokenStream;
use syn::{parse_macro_input, DeriveInput};
mod inner;

///
/// Derives the trait `See`, providing auto implementation for `See`,
/// while also combining the loading visitors into a single place.
///
/// ## Example
/// ```rust
///
/// #[derive(see_derive::See)]
/// struct Point {
///     x: i32,
///     y: i32
/// }
/// ```
/// This above example implements `See<crate::see_t::X>` and `See<crate::see_t::Y>` for the point struct
///
#[proc_macro_derive(See)]
pub fn see_derive(input: TokenStream) -> TokenStream {
    match inner::see_derive(parse_macro_input!(input as DeriveInput), false) {
        Ok(res) => res,
        Err(err) => err.into_compile_error(),
    }
    .into()
}

///
/// Derives the trait `Look` as well as `See`, `Look` trait has autoimplemenation
///
/// ## Example
/// ```rust
/// #[derive(see_derive::Look)]
/// struct Vector {
///     x: i32,
///     y: i32
/// }
/// ```
/// The above example implements:
/// - `See<crate::see_t::X>`, `Look<crate::see_t::X>`
/// - `See<crate::see_t::Y>`, `Look<crate::see_t::Y>`
///
///
#[proc_macro_derive(Look)]
pub fn look_derive(input: TokenStream) -> TokenStream {
    match inner::see_derive(parse_macro_input!(input as DeriveInput), true) {
        Ok(res) => res,
        Err(err) => err.into_compile_error(),
    }
    .into()
}

///
/// The derive macro includes the visitors in your codebase. Which
/// are created during the use of `#[derive(See)]`
///
/// ## Example
/// This derive must be used at the end of the origin location of your current crate, i.e. `lib.rs` or `main.rs`
/// or a way that will allow use to access the data as `crate::see_t`
/// ```rust
/// // In lib.rs
///
/// // .. your code goes here
///
///
/// pub(crate) mod see_t {
///     #[derive(see_derive::Load)]
///     struct SeeT;
/// }
/// ````
///
///
#[proc_macro_derive(Load)]
pub fn load_fields(input: TokenStream) -> TokenStream {
    inner::load_fields(&parse_macro_input!(input as DeriveInput)).into()
}

#[proc_macro]
pub fn auto_load(_input: TokenStream) -> TokenStream {
    inner::auto_load().into()
}