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#[macro_use]
extern crate dyon;

use dyon::{error, load_str, Call, Dfn, Module, Runtime, RustObject, Type};
use std::sync::Arc;

fn main() {
    let mut module = Module::new();

    // Add functions to read `a` and `b` from `RustArgs`.
    module.add(
        Arc::new("a_of".into()),
        a_of,
        Dfn::nl(vec![Type::Any], Type::F64),
    );
    module.add(
        Arc::new("b_of".into()),
        b_of,
        Dfn::nl(vec![Type::Any], Type::F64),
    );

    error(load_str(
        "main.dyon",
        Arc::new(
            r#"
        fn add_args(a: f64, b: f64) {
            println("add_args:")
            println(link {a" + "b" = "a + b})
        }

        fn add_obj(obj: {}) {
            println("add_obj:")
            println(link {obj.a" + "obj.b" = "obj.a + obj.b})
        }

        fn add_rust(obj: any) {
            println("add_rust")
            a := a_of(obj)
            b := b_of(obj)
            println(link {a" + "b" = "a + b})
        }

        add(a, b) = a + b

        create_vec(a, b) = (a, b)

        id(obj) = clone(obj)
    "#
            .into(),
        ),
        &mut module,
    ));
    let ref module = Arc::new(module);

    let a = 20.0;
    let b = 30.0;

    // Call with multiple arguments.
    let call = Call::new("add_args").arg(a).arg(b);
    error(call.run(&mut Runtime::new(), module));

    // Call with object.
    let call = Call::new("add_obj").arg(Args { a, b });
    error(call.run(&mut Runtime::new(), module));

    // Call with rust object.
    let call = Call::new("add_rust").rust(RustArgs { a, b });
    error(call.run(&mut Runtime::new(), module));

    // Call function with return value.
    let call = Call::new("add").arg(a).arg(b);
    match call.run_ret::<f64>(&mut Runtime::new(), module) {
        Ok(answer) => {
            println!("{}", answer);
        }
        Err(err) => {
            error(Err(err));
        }
    }

    // Call function that returns vec4.
    let call = Call::new("create_vec").arg(a).arg(b);
    match call.run_vec4::<[f64; 2]>(&mut Runtime::new(), module) {
        Ok(answer) => {
            println!("{:?}", answer);
        }
        Err(err) => {
            error(Err(err));
        }
    }

    // Call function that returns Rust object.
    let call = Call::new("id").rust(RustArgs { a, b });
    match call.run_ret::<RustObject>(&mut Runtime::new(), module) {
        Ok(answer) => {
            println!("{:?}", answer.lock().unwrap().downcast_ref::<RustArgs>());
        }
        Err(err) => {
            error(Err(err));
        }
    }
}

struct Args {
    a: f64,
    b: f64,
}

dyon_obj! {Args {a, b}}

#[derive(Debug)]
struct RustArgs {
    a: f64,
    b: f64,
}

dyon_fn! {fn a_of(obj: RustObject) -> f64 {
    let obj_guard = obj.lock().unwrap();
    obj_guard.downcast_ref::<RustArgs>().unwrap().a
}}

dyon_fn! {fn b_of(obj: RustObject) -> f64 {
    let obj_guard = obj.lock().unwrap();
    obj_guard.downcast_ref::<RustArgs>().unwrap().b
}}