pub mod page;
pub mod registry;

use url::Url;

use crate::UnfurlError;
use crate::resolver::{BoxFuture, ResolveContext, Resolver};
use crate::types::MessageEmbed;

pub use registry::RegistryResolver;

pub fn build_chain() -> Vec<Box<dyn Resolver>> {
    vec![Box::new(RegistryResolver), Box::new(DefaultResolver)]
}

pub struct DefaultResolver;

impl Resolver for DefaultResolver {
    fn matches(&self, _url: &Url) -> bool {
        true
    }

    fn resolve<'a>(
        &'a self,
        context: &'a ResolveContext<'_>,
    ) -> BoxFuture<'a, Result<Vec<MessageEmbed>, UnfurlError>> {
        Box::pin(async move {
            let embed = page::resolve_page(context).await?;
            Ok(embed.into_iter().collect())
        })
    }
}