use std::future::Future;
use std::pin::Pin;

use gix_hash::ObjectId;
use jacquard_common::deps::smol_str::SmolStr;
use jacquard_common::types::did::Did;

pub type SourceFuture<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;

pub trait LanguageSource: Send + Sync {
    fn page<'a>(
        &'a self,
        cursor: Option<&'a str>,
        limit: usize,
    ) -> SourceFuture<'a, Result<Page, String>>;

    fn languages<'a>(&'a self, repo: &'a Did, commit: ObjectId) -> SourceFuture<'a, Fetched>;
}

#[derive(Debug, Default)]
pub struct Page {
    pub repos: Vec<IndexedRepo>,
    pub cursor: Option<SmolStr>,
}

#[derive(Debug)]
pub struct IndexedRepo {
    pub repo: Did,
    pub commit: ObjectId,
    pub languages: Vec<(SmolStr, i64)>,
}

#[derive(Debug)]
pub enum Fetched {
    Languages(Vec<(SmolStr, i64)>),
    NotReady(SmolStr),
    Failed(String),
}