use std::collections::BTreeMap;

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct RuntimeRequestContext {
    pub request_id: String,
    pub correlation_id: String,
}

impl RuntimeRequestContext {
    pub fn new(request_id: impl Into<String>, correlation_id: impl Into<String>) -> Self {
        Self {
            request_id: request_id.into(),
            correlation_id: correlation_id.into(),
        }
    }

    pub fn from_request_id(request_id: impl Into<String>) -> Self {
        let request_id = request_id.into();
        Self::new(request_id.clone(), request_id)
    }

    pub fn outbound_headers(&self) -> BTreeMap<String, String> {
        BTreeMap::from([
            ("x-request-id".to_owned(), self.request_id.clone()),
            ("x-correlation-id".to_owned(), self.correlation_id.clone()),
        ])
    }
}

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

    #[test]
    fn uses_request_id_for_default_correlation_id() {
        let context = RuntimeRequestContext::from_request_id("req_123");

        assert_eq!(context.request_id, "req_123");
        assert_eq!(context.correlation_id, "req_123");
    }
}