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use std::io::Read;

use byteorder::{ByteOrder, ReadBytesExt};

/// `nr_cpus`
#[derive(Debug, Clone, Copy)]
pub struct NrCpus {
    /// CPUs not yet onlined
    pub nr_cpus_available: u32,
    pub nr_cpus_online: u32,
}

impl NrCpus {
    pub const STRUCT_SIZE: usize = 4 + 4;

    pub fn parse<R: Read, T: ByteOrder>(mut reader: R) -> Result<Self, std::io::Error> {
        let nr_cpus_available = reader.read_u32::<T>()?;
        let nr_cpus_online = reader.read_u32::<T>()?;
        Ok(Self {
            nr_cpus_available,
            nr_cpus_online,
        })
    }
}

/// The timestamps of the first and last sample.
#[derive(Debug, Clone, Copy)]
pub struct SampleTimeRange {
    pub first_sample_time: u64,
    pub last_sample_time: u64,
}

impl SampleTimeRange {
    pub const STRUCT_SIZE: usize = 8 + 8;

    pub fn parse<R: Read, T: ByteOrder>(mut reader: R) -> Result<Self, std::io::Error> {
        let first_sample_time = reader.read_u64::<T>()?;
        let last_sample_time = reader.read_u64::<T>()?;
        Ok(Self {
            first_sample_time,
            last_sample_time,
        })
    }
}