//
// Copyright 2019, Google Inc.
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//
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// modification, are permitted provided that the following conditions are
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//
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//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Alternatively, this software may be distributed under the terms of the
// GNU General Public License ("GPL") version 2 as published by the Free
// Software Foundation.
//

use std::ffi::OsStr;
use std::fmt::Debug;
use std::io::Result as IoResult;
use std::process::{Command, Stdio};

use super::utils;

fn dmidecode_dispatch<S: AsRef<OsStr>>(args: &[S]) -> IoResult<String> {
    let output = Command::new("/usr/sbin/dmidecode")
        .args(args)
        .stdin(Stdio::null())
        .output()?;

    if !output.status.success() {
        return Err(utils::translate_command_error(&output));
    }
    Ok(String::from_utf8_lossy(&output.stdout).into_owned())
}

pub fn system_info() -> IoResult<String> {
    dmidecode_dispatch(&["-q", "-t1"])
}

pub fn bios_info() -> IoResult<String> {
    dmidecode_dispatch(&["-q", "-t0"])
}

pub fn eventlog_list() -> Result<String, std::io::Error> {
    mosys_dispatch(&["eventlog", "list"])
}

fn mosys_dispatch<S: AsRef<OsStr> + Debug>(args: &[S]) -> IoResult<String> {
    info!("mosys_dispatch() running: /usr/sbin/mosys {:?}", args);

    let output = Command::new("/usr/sbin/mosys")
        .args(args)
        .stdin(Stdio::null())
        .output()?;
    if !output.status.success() {
        return Err(utils::translate_command_error(&output));
    }

    let stdout = String::from_utf8_lossy(&output.stdout).into_owned();
    Ok(stdout)
}