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use rand;
use frame::*;
use frame::events::SimpleServerEvent;
use types::{CString, CStringList};

/// The structure which represents a body of a frame of type `options`.
pub struct BodyReqRegister {
    pub events: Vec<SimpleServerEvent>,
}

impl IntoBytes for BodyReqRegister {
    fn into_cbytes(&self) -> Vec<u8> {
        let events_string_list =
            CStringList { list: self.events.iter()
                                    .map(|event| CString::new(event.as_string()))
                                    .collect(), };
        events_string_list.into_cbytes()
    }
}

// Frame implementation related to BodyReqRegister

impl Frame {
    /// Creates new frame of type `REGISTER`.
    pub fn new_req_register(events: Vec<SimpleServerEvent>) -> Frame {
        let version = Version::Request;
        let flag = Flag::Ignore;
        let stream = rand::random::<u16>();
        let opcode = Opcode::Register;
        let register_body = BodyReqRegister { events: events };

        Frame { version: version,
                flags: vec![flag],
                stream: stream,
                opcode: opcode,
                body: register_body.into_cbytes(),
                // for request frames it's always None
                tracing_id: None,
                warnings: vec![], }
    }
}