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use crate::cell::Cell;
use crate::impl_::dep::Dep;
use crate::impl_::lambda::IsLambda1;
use crate::impl_::lambda::IsLambda2;
use crate::impl_::lambda::IsLambda3;
use crate::impl_::lambda::{lambda1, lambda2};
use crate::impl_::stream::Stream as StreamImpl;
use crate::listener::Listener;
use crate::sodium_ctx::SodiumCtx;
use crate::Lazy;

pub struct Stream<A> {
    pub impl_: StreamImpl<A>,
}

impl<A> Clone for Stream<A> {
    fn clone(&self) -> Self {
        Stream {
            impl_: self.impl_.clone(),
        }
    }
}

impl<A: Clone + Send + 'static> Stream<Option<A>> {
    pub fn filter_option(&self) -> Stream<A> {
        self.filter(|a: &Option<A>| a.is_some())
            .map(|a: &Option<A>| a.clone().unwrap())
    }
}

impl<A: Clone + Send + 'static> Stream<A> {
    pub fn new(sodium_ctx: &SodiumCtx) -> Stream<A> {
        Stream {
            impl_: StreamImpl::new(&sodium_ctx.impl_),
        }
    }

    // use as dependency to lambda1, lambda2, etc.
    pub fn to_dep(&self) -> Dep {
        self.impl_.to_dep()
    }

    pub fn snapshot<
        B: Clone + Send + 'static,
        C: Clone + Send + 'static,
        FN: IsLambda2<A, B, C> + Send + Sync + 'static,
    >(
        &self,
        cb: &Cell<B>,
        f: FN,
    ) -> Stream<C> {
        Stream {
            impl_: self.impl_.snapshot(&cb.impl_, f),
        }
    }

    pub fn snapshot1<B: Send + Clone + 'static>(&self, cb: &Cell<B>) -> Stream<B> {
        self.snapshot(cb, |_a: &A, b: &B| b.clone())
    }

    pub fn snapshot3<
        B: Send + Clone + 'static,
        C: Send + Clone + 'static,
        D: Send + Clone + 'static,
        FN: IsLambda3<A, B, C, D> + Send + Sync + 'static,
    >(
        &self,
        cb: &Cell<B>,
        cc: &Cell<C>,
        mut f: FN,
    ) -> Stream<D> {
        let deps: Vec<Dep>;
        if let Some(deps2) = f.deps_op() {
            deps = deps2.clone();
        } else {
            deps = Vec::new();
        }
        let cc = cc.clone();
        self.snapshot(
            cb,
            lambda2(move |a: &A, b: &B| f.call(a, b, &cc.sample()), deps),
        )
    }

    pub fn map<B: Send + Clone + 'static, FN: IsLambda1<A, B> + Send + Sync + 'static>(
        &self,
        f: FN,
    ) -> Stream<B> {
        Stream {
            impl_: self.impl_.map(f),
        }
    }

    pub fn map_to<B: Send + Sync + Clone + 'static>(&self, b: B) -> Stream<B> {
        self.map(move |_: &A| b.clone())
    }

    pub fn filter<PRED: IsLambda1<A, bool> + Send + Sync + 'static>(
        &self,
        pred: PRED,
    ) -> Stream<A> {
        Stream {
            impl_: self.impl_.filter(pred),
        }
    }

    pub fn or_else(&self, s2: &Stream<A>) -> Stream<A> {
        self.merge(s2, |lhs: &A, _rhs: &A| lhs.clone())
    }

    pub fn merge<FN: IsLambda2<A, A, A> + Send + Sync + 'static>(
        &self,
        s2: &Stream<A>,
        f: FN,
    ) -> Stream<A> {
        Stream {
            impl_: self.impl_.merge(&s2.impl_, f),
        }
    }

    pub fn hold(&self, a: A) -> Cell<A> {
        Cell {
            impl_: self.impl_.hold(a),
        }
    }

    pub fn hold_lazy(&self, a: Lazy<A>) -> Cell<A> {
        Cell {
            impl_: self.impl_.hold_lazy(a),
        }
    }

    pub fn gate(&self, cpred: &Cell<bool>) -> Stream<A> {
        let cpred = cpred.clone();
        let cpred_dep = cpred.to_dep();
        self.filter(lambda1(move |_: &A| cpred.sample(), vec![cpred_dep]))
    }

    pub fn once(&self) -> Stream<A> {
        Stream {
            impl_: self.impl_.once(),
        }
    }

    pub fn collect<B, S, F>(&self, init_state: S, f: F) -> Stream<B>
    where
        B: Send + Clone + 'static,
        S: Send + Clone + 'static,
        F: IsLambda2<A, S, (B, S)> + Send + Sync + 'static,
    {
        self.collect_lazy(Lazy::new(move || init_state.clone()), f)
    }

    pub fn collect_lazy<B, S, F>(&self, init_state: Lazy<S>, f: F) -> Stream<B>
    where
        B: Send + Clone + 'static,
        S: Send + Clone + 'static,
        F: IsLambda2<A, S, (B, S)> + Send + Sync + 'static,
    {
        Stream {
            impl_: self.impl_.collect_lazy(init_state, f),
        }
    }

    pub fn accum<S, F>(&self, init_state: S, f: F) -> Cell<S>
    where
        S: Send + Clone + 'static,
        F: IsLambda2<A, S, S> + Send + Sync + 'static,
    {
        self.accum_lazy(Lazy::new(move || init_state.clone()), f)
    }

    pub fn accum_lazy<S, F>(&self, init_state: Lazy<S>, f: F) -> Cell<S>
    where
        S: Send + Clone + 'static,
        F: IsLambda2<A, S, S> + Send + Sync + 'static,
    {
        Cell {
            impl_: self.impl_.accum_lazy(init_state, f),
        }
    }

    pub fn listen_weak<K: IsLambda1<A, ()> + Send + Sync + 'static>(&self, k: K) -> Listener {
        Listener {
            impl_: self.impl_.listen_weak(k),
        }
    }

    pub fn listen<K: IsLambda1<A, ()> + Send + Sync + 'static>(&self, k: K) -> Listener {
        Listener {
            impl_: self.impl_.listen(k),
        }
    }
}