use std::fs;
use std::process::Command;

// test disk sequential read speeds w/ fio
pub fn disk_read_seq_test(tempfile: &str, size: &u8) {
    // run the fio command
    let output = Command::new("fio")
        .arg("--name=TEST")
        .arg(format!("--filename={}", tempfile))
        .arg("--rw=read")
        .arg("--size=2g")
        .arg(format!("--io_size={}g", size))
        .arg("--blocksize=1024k")
        .arg("--ioengine=libaio")
        .arg("--fsync=10000")
        .arg("--iodepth=32")
        .arg("--direct=1")
        .arg("--numjobs=1")
        .arg("--runtime=60")
        .arg("--group_reporting")
        .output()
        .expect("Failed to execute command");

    // check that the command succeeded
    assert!(output.status.success());

    // print the test's output
    println!("{}", String::from_utf8_lossy(&output.stdout));
}

// test disk 4K random read speeds w/ fio
pub fn disk_read_rand_test(tempfile: &str, size: &u8) {
    // run the fio command
    let output = Command::new("fio")
        .arg("--name=TEST")
        .arg(format!("--filename={}", tempfile))
        .arg("--rw=randread")
        .arg("--size=2g")
        .arg(format!("--io_size={}g", size))
        .arg("--blocksize=4k")
        .arg("--ioengine=libaio")
        .arg("--fsync=1")
        .arg("--iodepth=32")
        .arg("--direct=1")
        .arg("--numjobs=1")
        .arg("--runtime=60")
        .arg("--group_reporting")
        .output()
        .expect("Failed to execute command");

    // check that the command succeeded
    assert!(output.status.success());

    // print the test's output
    println!("{}", String::from_utf8_lossy(&output.stdout));
}

// test disk write speeds by continually writing zeroes to it
pub fn disk_write_test(tempfile: &str, size: &u8) {
    // convert size in Gigabytes down to Megabytes
    let size_gigs: u32 = (*size as u32 * 1024).into();

    // run the dd command with a block size of 1 MB
    let output = Command::new("dd")
        .arg("bs=1M")
        .arg(format!("count={}", size_gigs))
        .arg("if=/dev/zero")
        .arg(format!("of={}", tempfile))
        .output()
        .expect("Failed to execute command");

    // check that the command succeeded
    assert!(output.status.success());

    // for whatever reason, `dd` output ends up in stderr
    println!("{}", String::from_utf8_lossy(&output.stderr));

    // remove the test file
    match fs::remove_file(tempfile) {
        Ok(()) => println!("Cleaning up..."),
        Err(e) => println!("There was a problem during cleanup - {}", e),
    }
}