//! `web_client` — the client delivery layer. It owns *how* the embedded
//! [`web_assets`] reach the browser (the HTTP response framing), keeping the
//! raw asset bytes (`web_assets`) separate from delivery concerns. The server
//! depends on this crate, not on `web_assets` directly.

pub use web_assets::{resolve, Asset};

/// Build a complete HTTP/1.1 response for a static GET path. Returns `None`
/// for unknown paths so the caller can emit a 404.
pub fn http_response(path: &str) -> Option<Vec<u8>> {
    let asset = resolve(path)?;
    let body = asset.body.as_bytes();
    let mut out = Vec::with_capacity(body.len() + 128);
    let header = format!(
        "HTTP/1.1 200 OK\r\nContent-Type: {}\r\nContent-Length: {}\r\nCache-Control: no-cache\r\nConnection: close\r\n\r\n",
        asset.content_type,
        body.len()
    );
    out.extend_from_slice(header.as_bytes());
    out.extend_from_slice(body);
    Some(out)
}

/// The canonical 404 response.
pub fn not_found() -> Vec<u8> {
    let body = b"404 not found";
    let mut out = Vec::new();
    let header = format!(
        "HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\nContent-Length: {}\r\nConnection: close\r\n\r\n",
        body.len()
    );
    out.extend_from_slice(header.as_bytes());
    out.extend_from_slice(body);
    out
}

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

    #[test]
    fn serves_shell() {
        let r = http_response("/").unwrap();
        let s = String::from_utf8_lossy(&r);
        assert!(s.starts_with("HTTP/1.1 200 OK"));
        assert!(s.contains("text/html"));
        assert!(s.contains("Magicka VM"));
    }

    #[test]
    fn unknown_path_is_none() {
        assert!(http_response("/secret").is_none());
    }
}