//! Build-time codegen for the AZ-675 telemetry gRPC contract.
//!
//! We use `protoc-bin-vendored` so the build is self-contained — no
//! system protoc install is required on dev or CI. The PROTOC env
//! var is set before invoking `tonic-prost-build`, which is what
//! tonic uses to locate the compiler.

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let protoc = protoc_bin_vendored::protoc_bin_path()?;
    std::env::set_var("PROTOC", protoc);

    tonic_prost_build::configure()
        .build_client(true)
        .build_server(true)
        .compile_protos(&["proto/telemetry.proto"], &["proto"])?;

    println!("cargo:rerun-if-changed=proto/telemetry.proto");
    Ok(())
}