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use alloc::{string::String, vec::Vec, collections::{BTreeMap, BTreeSet}};
use crate::{FromInternalIterator, InternalIterator, IntoInternalIterator};

impl<A> FromInternalIterator<A> for Vec<A> {
    fn from_iter<T>(iter: T) -> Self
    where
        T: IntoInternalIterator<Item = A>
    {
        let mut result = Vec::new();
        iter.into_internal_iter().for_each(|item| {
            result.push(item);
        });
        result
    }
}

impl FromInternalIterator<char> for String {
    fn from_iter<T>(iter: T) -> Self
    where
        T: IntoInternalIterator<Item = char>
    {
        let mut result = String::new();
        iter.into_internal_iter().for_each(|item| {
            result.push(item);
        });
        result
    }
}

impl<A: Ord> FromInternalIterator<A> for BTreeSet<A> {
    fn from_iter<T>(iter: T) -> Self
    where
        T: IntoInternalIterator<Item = A>
    {
        let mut result = BTreeSet::new();
        iter.into_internal_iter().for_each(|item| {
            result.insert(item);
        });
        result
    }
}

impl<K: Ord, V> FromInternalIterator<(K, V)> for BTreeMap<K, V> {
    fn from_iter<T>(iter: T) -> Self
    where
        T: IntoInternalIterator<Item = (K, V)>
    {
        let mut result = BTreeMap::new();
        iter.into_internal_iter().for_each(|(k, v)| {
            result.insert(k, v);
        });
        result
    }
}