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use prost::Message;

// useful tutorial for proto over ffi here:
// https://github.com/mozilla/application-services/blob/master/docs/howtos/passing-protobuf-data-over-ffi.md
#[doc(hidden)]
pub unsafe fn ptr_to_buffer<'a>(data: *const u8, len: i32) -> &'a [u8] {
    assert!(len >= 0, "Bad buffer len: {}", len);
    if len == 0 {
        // This will still fail, but as a bad protobuf format.
        &[]
    } else {
        assert!(!data.is_null(), "Unexpected null data pointer");
        std::slice::from_raw_parts(data, len as usize)
    }
}

#[doc(hidden)]
pub fn buffer_to_ptr<T>(buffer: T) -> ffi_support::ByteBuffer
    where T: Message {
    let mut out_buffer = Vec::new();
    match buffer.encode(&mut out_buffer) {
        Ok(_) => ffi_support::ByteBuffer::from_vec(out_buffer),
        Err(error) => {
            println!("Error encoding response protobuf.");
            println!("{:?}", error);
            ffi_support::ByteBuffer::new_with_size(0)
        }
    }
}