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//
// Copyright (c) 2022 ZettaScale Technology
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
//
// Contributors:
//   ZettaScale Zenoh Team, <zenoh@zettascale.tech>
//
use crate::common::ZExtUnknown;
use alloc::vec::Vec;

/// # Pull message
///
/// ```text
/// Flags:
/// - X: Reserved
/// - X: Reserved
/// - Z: Extension      If Z==1 then at least one extension is present
///
///   7 6 5 4 3 2 1 0
///  +-+-+-+-+-+-+-+-+
///  |Z|X|X|  PULL  |
///  +-+-+-+---------+
///  ~  [pull_exts]  ~  if Z==1
///  +---------------+
/// ```
pub mod flag {
    // pub const X: u8 = 1 << 5; // 0x20 Reserved
    // pub const X: u8 = 1 << 6; // 0x40 Reserved
    pub const Z: u8 = 1 << 7; // 0x80 Extensions    if Z==1 then an extension will follow
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Pull {
    pub ext_unknown: Vec<ZExtUnknown>,
}

impl Pull {
    #[cfg(feature = "test")]
    pub fn rand() -> Self {
        use rand::Rng;
        let mut rng = rand::thread_rng();

        let mut ext_unknown = Vec::new();
        for _ in 0..rng.gen_range(0..4) {
            ext_unknown.push(ZExtUnknown::rand2(1, false));
        }

        Self { ext_unknown }
    }
}