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use std::future::Future;

use futures_signals::signal_vec::VecDiff;

pub trait SignalSpawn<A> {
    #[cfg(not(target_os = "unknown"))]
    fn spawn<F>(self, f: F)
    where
        Self: Send,
        F: Fn(A) + Send + 'static;

    #[cfg(not(target_os = "unknown"))]
    fn spawn_fut<F, W>(self, f: F)
    where
        Self: Send,
        F: Fn(A) -> W + Send + 'static,
        W: Future<Output = ()> + Send + 'static;

    #[cfg(all(target_arch = "wasm32"))]
    fn spawn<F>(self, f: F)
    where
        F: Fn(A) + 'static;

    #[cfg(all(target_arch = "wasm32"))]
    fn spawn_fut<F, W>(self, f: F)
    where
        F: Fn(A) -> W + 'static,
        W: Future<Output = ()> + 'static;
}

pub trait SignalVecSpawn<A> {
    #[cfg(not(target_os = "unknown"))]
    fn spawn<F>(self, f: F)
    where
        Self: Send,
        F: Fn(VecDiff<A>) + Send + 'static;

    #[cfg(all(target_arch = "wasm32"))]
    fn spawn<F>(self, f: F)
    where
        F: Fn(VecDiff<A>) + 'static;
}

#[cfg(not(target_os = "unknown"))]
mod os {
    use std::future::{ready, Future};

    use futures_signals::{
        signal::{Signal, SignalExt},
        signal_vec::{SignalVec, SignalVecExt, VecDiff},
    };

    use crate::{SignalSpawn, SignalVecSpawn};

    impl<A, S> SignalSpawn<A> for S
    where
        S: Signal<Item = A> + 'static,
    {
        fn spawn<F>(self, f: F)
        where
            Self: Send,
            F: Fn(A) + Send + 'static,
        {
            self.spawn_fut(move |new| {
                f(new);
                ready(())
            });
        }

        fn spawn_fut<F, W>(self, f: F)
        where
            Self: Send,
            F: Fn(A) -> W + Send + 'static,
            W: Future<Output = ()> + Send + 'static,
        {
            artwrap::spawn(self.for_each(move |new| f(new)));
        }
    }

    impl<A, S> SignalVecSpawn<A> for S
    where
        S: SignalVec<Item = A> + 'static,
    {
        fn spawn<F>(self, f: F)
        where
            Self: Send,
            F: Fn(VecDiff<A>) + Send + 'static,
        {
            artwrap::spawn(self.for_each(move |new| {
                f(new);
                ready(())
            }));
        }
    }
}

#[cfg(all(target_arch = "wasm32"))]
mod wasm {
    use std::future::{ready, Future};

    use futures_signals::{
        signal::{Signal, SignalExt},
        signal_vec::{SignalVec, SignalVecExt, VecDiff},
    };

    use crate::{SignalSpawn, SignalVecSpawn};

    impl<A, S> SignalSpawn<A> for S
    where
        S: Signal<Item = A> + 'static,
    {
        fn spawn<F>(self, f: F)
        where
            F: Fn(A) + 'static,
        {
            self.spawn_fut(move |new| {
                f(new);
                ready(())
            });
        }

        fn spawn_fut<F, W>(self, f: F)
        where
            F: Fn(A) -> W + 'static,
            W: Future<Output = ()> + 'static,
        {
            artwrap::spawn(self.for_each(move |new| f(new)));
        }
    }

    impl<A, S> SignalVecSpawn<A> for S
    where
        S: SignalVec<Item = A> + 'static,
    {
        fn spawn<F>(self, f: F)
        where
            F: Fn(VecDiff<A>) + 'static,
        {
            artwrap::spawn(self.for_each(move |new| {
                f(new);
                ready(())
            }));
        }
    }
}