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use anyhow::Result;
use futures::StreamExt;
use iced_native::widget::scrollable::State as ScrollableState;
use crate::app::Message;
use crate::post::Post;
use distrox_lib::client::Client;
use distrox_lib::stream::NodeStreamBuilder;
use distrox_lib::types::Payload;
#[derive(Debug)]
pub struct Timeline {
posts: Vec<Post>,
scrollable: ScrollableState,
}
impl Timeline {
pub fn new() -> Self {
Self {
posts: Vec::new(),
scrollable: ScrollableState::new(),
}
}
pub fn push(&mut self, payload: Payload, content: String) {
self.posts.push(Post::new(payload, content));
}
pub fn view(&mut self) -> iced::Element<Message> {
let scrollable = iced::Scrollable::new(&mut self.scrollable)
.padding(10)
.spacing(20)
.width(iced::Length::Fill)
.height(iced::Length::Fill)
.on_scroll(move |offset| {
Message::TimelineScrolled(offset)
});
self.posts
.iter()
.fold(scrollable, |scrollable, post| {
scrollable.push(post.view())
})
.into()
}
}
pub struct PostLoadingRecipe {
client: Client,
head: cid::Cid,
}
impl PostLoadingRecipe {
pub fn new(client: Client, head: cid::Cid) -> Self {
Self { client, head }
}
}
// Make sure iced can use our download stream
impl<H, I> iced_native::subscription::Recipe<H, I> for PostLoadingRecipe
where
H: std::hash::Hasher,
{
type Output = Message;
fn hash(&self, state: &mut H) {
use std::hash::Hash;
self.head.to_bytes().hash(state);
}
fn stream(self: Box<Self>, _input: futures::stream::BoxStream<'static, I>) -> futures::stream::BoxStream<'static, Self::Output>
{
log::debug!("Streaming posts starting at HEAD = {:?}", self.head);
Box::pin({
NodeStreamBuilder::starting_from(self.head.clone())
.into_stream(self.client.clone())
.then(move |node| {
let client = self.client.clone();
async move {
let payload = client.get_payload(node?.payload()).await?;
let content = client.get_content_text(payload.content()).await?;
Ok((payload, content))
}
})
.map(|res: Result<_>| match res {
Err(_) => Message::PostLoadingFailed,
Ok(p) => Message::PostLoaded(p),
})
})
}
}
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