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use crate::Property;
use crate::TryIter;
use crate::Parameter;
use std::ops::Index;
use std::rc::Rc;

#[cfg(feature = "async")]
use crate::{ReceiverAsync, StreamExt};

#[derive(Default)]
pub struct IndexedProperty<'a, C, I>
where C: Index<I>,
    I: Clone + 'a,
    <C as Index<I>>::Output: 'a,
{
    collection: Rc<C>,
    index: Property<'a, I>
}

impl<'a,C,I> Clone for IndexedProperty<'a, C, I>
where C: Index<I>,
    I: Clone + 'a,
    <C as Index<I>>::Output: 'a,
{
    fn clone(&self) -> Self {
        IndexedProperty {
            collection: self.collection.clone(),
            index: self.index.clone(),
        }
    }
}

impl<'a, C, I> IndexedProperty<'a, C, I>
where C: Index<I> + 'a,
    I: Clone + 'a,
    <C as Index<I>>::Output: 'a,
{
    pub fn new(collection: C, initial_index: I) -> IndexedProperty<'a, C, I> {
        IndexedProperty{
            collection: Rc::new(collection),
            index: Property::new(initial_index),
        }
    }

    pub fn from_index_property(collection: C, index: Property<'a, I>) -> IndexedProperty<'a, C, I> {
        IndexedProperty{
            collection: Rc::new(collection),
            index,
        }
    }

    pub fn get(&self) -> &<C as Index<I>>::Output{
        &self.collection[self.index.get().clone()]
    }

    pub fn current_index(&self) -> I {
        self.index.get().clone()
    }

    pub fn set(&mut self, index: I) {
        self.index.set(index)
    }

    pub fn collection(&self) -> &C {
        &self.collection
    }

    pub fn index_property(&self) -> &Property<'a,I>{
        &self.index
    }

    pub fn index_property_mut(&mut self) -> &mut Property<'a,I>{
        &mut self.index
    }
}

impl<'a, C, I> IndexedProperty<'a, C, I>
where C: Index<I> + 'a,
    I: Clone + 'a,
    <C as Index<I>>::Output: 'a + Clone,
{
    #[cfg(feature = "async")]
    pub fn receiver_async<'b>(self) -> ReceiverAsync<'b, <C as Index<I>>::Output> where 'a: 'b{
        let initial = self.get().clone();
        let collection = self.collection;
        let stream = self.index.stream().map(move |i| collection[i].clone());
        ReceiverAsync::new_initial(stream, initial)
    }
}

impl<'a, C, I> IndexedProperty<'a, C, I>
where C: Index<I> + 'a,
    I: Clone + 'a,
    <C as Index<I>>::Output: Clone + 'a,
{
    pub fn try_iter<'b>(self) -> TryIter<'b, <C as Index<I>>::Output> where 'a: 'b{
        let collection = self.collection;
        self.index.map(move |i| collection[i].clone()).try_iter()
    }

    pub fn to_parameter<'b>(self) -> Parameter<'b, <C as Index<I>>::Output> where 'a: 'b{
        let initial = self.get().clone();
        Parameter::from_parent(self.try_iter(), initial)
    }

    pub fn into_property(self) -> Property<'a, <C as Index<I>>::Output>{
        let collection = self.collection;
        self.index.map(move |i| collection[i].clone())
    }
}