//! `web_assets` — the browser client's static files, embedded at compile time
//! so the server ships as a single binary with no runtime filesystem
//! dependency. The actual HTML/CSS/JS live under `assets/`.

pub const INDEX_HTML: &str = include_str!("../assets/index.html");
pub const STYLE_CSS: &str = include_str!("../assets/style.css");
pub const APP_JS: &str = include_str!("../assets/app.js");

/// A served asset: its bytes and MIME type.
pub struct Asset {
    pub body: &'static str,
    pub content_type: &'static str,
}

/// Resolve a request path to a static asset. `/` maps to the client shell.
pub fn resolve(path: &str) -> Option<Asset> {
    match path {
        "/" | "/index.html" => Some(Asset { body: INDEX_HTML, content_type: "text/html; charset=utf-8" }),
        "/style.css" => Some(Asset { body: STYLE_CSS, content_type: "text/css; charset=utf-8" }),
        "/app.js" => Some(Asset { body: APP_JS, content_type: "application/javascript; charset=utf-8" }),
        _ => None,
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn shell_and_assets_resolve() {
        assert!(resolve("/").is_some());
        assert!(resolve("/app.js").is_some());
        assert!(resolve("/style.css").is_some());
        assert!(resolve("/nope").is_none());
    }

    #[test]
    fn client_only_sends_intent() {
        // Guard against the client ever embedding a second simulation: the
        // browser code must not reference the reference engine internals.
        assert!(!APP_JS.contains("EngineConfig"));
        assert!(APP_JS.contains("only ever sends INTENT"));
    }
}