//! Picks the `ReleaseSource` implementation for a package from its
//! configured `source`. The one place that knows which hosts exist; the
//! pipeline and the stages it calls only ever see the trait.

use crate::checker::ReleaseSource;
use crate::config::{Package, Source};
use crate::forgejo::ForgejoEndpoints;
use crate::github::GithubEndpoints;
use anyhow::{Context, Result};

/// Defensive: errors only if a `forgejo-release` package has no
/// `base_url`, which `config::load_packages_dir` already guarantees.
pub fn for_package(pkg: &Package) -> Result<Box<dyn ReleaseSource>> {
    match pkg.source {
        Source::GithubRelease => Ok(Box::new(GithubEndpoints::default())),
        Source::ForgejoRelease => {
            let base_url = pkg
                .base_url
                .as_deref()
                .context("source = \"forgejo-release\" needs a base_url")?;
            Ok(Box::new(ForgejoEndpoints::from_base_url(base_url)))
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_support::same_origin_package as package;

    #[test]
    fn github_source_uses_real_github() {
        let source = for_package(&package("")).unwrap();
        assert_eq!(source.api(), "https://api.github.com");
    }

    #[test]
    fn forgejo_source_uses_the_instances_api() {
        let pkg = package("source = \"forgejo-release\"\nbase_url = \"https://code.example.com\"");
        let source = for_package(&pkg).unwrap();
        assert_eq!(source.api(), "https://code.example.com/api/v1");
    }

    #[test]
    fn forgejo_source_without_base_url_errors() {
        let err = for_package(&package("source = \"forgejo-release\"")).unwrap_err();
        assert!(err.to_string().contains("needs a base_url"));
    }
}