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//! Argument parsing and checking.
//!

use libR_sys::*;
//use crate::robj::*;
use crate::robj::Robj;
use crate::{new_owned, single_threaded};

/// Convert a list of tokens to an array of tuples.
#[doc(hidden)]
#[macro_export]
macro_rules! push_args {
    ($args: expr, $name: ident = $val : expr) => {
        $args.push((stringify!($name), Robj::from($val)));
    };
    ($args: expr, $name: ident = $val : expr, $($rest: tt)*) => {
        $args.push((stringify!($name), Robj::from($val)));
        push_args!($args, $($rest)*);
    };
    ($args: expr, $val : expr) => {
        $args.push(("", Robj::from($val)));
    };
    ($args: expr, $val : expr, $($rest: tt)*) => {
        $args.push(("", Robj::from($val)));
        push_args!($args, $($rest)*);
    };
}

#[doc(hidden)]
#[macro_export]
macro_rules! args {
    () => {
        Vec::<(&str, Robj)>::new()
    };
    ($($rest: tt)*) => {
        {
            let mut args = Vec::<(&str, Robj)>::new();
            push_args!(args, $($rest)*);
            args
        }
    };
}

#[doc(hidden)]
pub unsafe fn append_with_name(tail: SEXP, obj: Robj, name: &str) -> SEXP {
    single_threaded(|| {
        let mut name = Vec::from(name.as_bytes());
        name.push(0);
        let cons = Rf_cons(obj.get(), R_NilValue);
        SET_TAG(
            cons,
            Rf_install(name.as_ptr() as *const std::os::raw::c_char),
        );
        SETCDR(tail, cons);
        cons
    })
}

#[doc(hidden)]
pub unsafe fn append(tail: SEXP, obj: Robj) -> SEXP {
    let cons = Rf_cons(obj.get(), R_NilValue);
    SETCDR(tail, cons);
    cons
}

#[doc(hidden)]
pub unsafe fn make_lang(sym: &str) -> Robj {
    let mut name = Vec::from(sym.as_bytes());
    name.push(0);
    let sexp =
        single_threaded(|| Rf_lang1(Rf_install(name.as_ptr() as *const std::os::raw::c_char)));
    new_owned(sexp)
}

/// Convert a list of tokens to an array of tuples.
#[doc(hidden)]
#[macro_export]
macro_rules! append_lang {
    ($tail: ident, $name: ident = $val : expr) => {
        $tail = append_with_name($tail, Robj::from($val), stringify!($name));
    };
    ($tail: ident, $name: ident = $val : expr, $($rest: tt)*) => {
        $tail = append_with_name($tail, Robj::from($val), stringify!($name));
        append_lang!($tail, $($rest)*);
    };
    ($tail: ident, $val : expr) => {
        $tail = append($tail, Robj::from($val));
    };
    ($tail: ident, $val : expr, $($rest: tt)*) => {
        $tail = append($tail, Robj::from($val));
        append_lang!($tail, $($rest)*);
    };
}

/// The call! macro calls an R function with Rust parameters.
/// Equivalent to `lang!(sym, params).eval()`
/// This returns a Rust Result.
///
/// Example:
/// ```
/// use extendr_api::prelude::*;
/// test! {
///     let vec = call!("c", 1.0, 2.0, 3.0).unwrap();
///     assert_eq!(vec, r!([1., 2., 3.]));
///     assert_eq!(vec.is_owned(), true);
///
///     let list = call!("list", a=1, b=2).unwrap();
///     assert_eq!(list.len(), 2);
///
///     let three = call!("+", 1, 2).unwrap();
///     assert_eq!(three, r!(3));
/// }
/// ```
#[macro_export]
macro_rules! call {
    ($($toks: tt)*) => {
        lang!($($toks)*).eval()
    }
}

/// A macro for constructing R langage objects.
///
/// Example:
/// ```
/// use extendr_api::prelude::*;
/// test! {
///     let call_to_c = lang!("c", 1., 2., 3.);
///     let vec = call_to_c.eval().unwrap();
///     assert_eq!(vec, r!([1., 2., 3.]));
///
///     let list = lang!("list", a=1, b=2).eval().unwrap();
///     assert_eq!(list.len(), 2);
/// }
/// ```
#[macro_export]
macro_rules! lang {
    ($sym : expr) => {
        unsafe {
            make_lang($sym)
        }
    };
    ($sym : expr, $($rest: tt)*) => {
        unsafe {
            let res = make_lang($sym);
            let mut tail = res.get();
            append_lang!(tail, $($rest)*);
            let _ = tail;
            res
        }
    };
}