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use std::{collections::VecDeque, sync::Arc};
use pandascore::{
endpoint::{ListResponse, PaginatedEndpoint},
ClientTransport,
};
use crate::adapter::AdapterInner;
#[derive(Debug)]
pub struct PaginationIterator<C, E: PaginatedEndpoint> {
adapter: Arc<AdapterInner<C>>,
init: Option<E>,
results: VecDeque<E::Item>,
}
impl<C, E> PaginationIterator<C, E>
where
C: ClientTransport,
E: PaginatedEndpoint,
{
pub fn new(adapter: Arc<AdapterInner<C>>, init: E) -> Self {
Self {
adapter,
init: Some(init),
results: VecDeque::new(),
}
}
}
impl<C, E, T> Iterator for PaginationIterator<C, E>
where
C: ClientTransport,
E: PaginatedEndpoint<Item = T, Response = ListResponse<T>> + Clone + std::fmt::Debug,
{
type Item = E::Item;
fn next(&mut self) -> Option<Self::Item> {
if let Some(next) = self.results.pop_front() {
return Some(next);
}
if let Some(req) = self.init.take() {
let response = self.adapter.execute(req.clone())?;
self.init = response.next.map(|opts| req.with_options(opts));
self.results = response.results.into();
self.results.pop_front()
} else {
None
}
}
}
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