use std::{collections::BTreeMap, iter::FromIterator};

use ruma::api::client::discovery::get_supported_versions;

use crate::{Ar, Ra, Result};

/// # `GET /_matrix/client/versions`
///
/// Get the versions of the specification and unstable features supported by
/// this server.
///
/// - Versions take the form MAJOR.MINOR.PATCH
/// - Only the latest PATCH release will be reported for each MAJOR.MINOR value
/// - Unstable features are namespaced and may include version information in
///   their name
///
/// Note: Unstable features are used while developing new features. Clients
/// should avoid using unstable features in their stable releases
pub(crate) async fn get_supported_versions_route(
    _body: Ar<get_supported_versions::Request>,
) -> Result<Ra<get_supported_versions::Response>> {
    let resp = get_supported_versions::Response {
        versions: vec![
            "r0.5.0".to_owned(),
            "r0.6.0".to_owned(),
            "v1.1".to_owned(),
            "v1.2".to_owned(),
            "v1.3".to_owned(),
            "v1.4".to_owned(),
            "v1.5".to_owned(),
        ],
        unstable_features: BTreeMap::from_iter([(
            "org.matrix.e2e_cross_signing".to_owned(),
            true,
        )]),
    };

    Ok(Ra(resp))
}