use super::Cmd;
use clap::{Arg, ArgAction, Command, ValueHint};
use std::{ffi::CString, fs, io, path::PathBuf};

#[derive(Debug, Default)]
pub struct MkTemp;

impl Cmd for MkTemp {
    fn cli(&self) -> clap::Command {
        Command::new("mktemp")
            .about("create a unique temporary file")
            .author("Nathan Fisher")
            .version(env!("CARGO_PKG_VERSION"))
            .args([
                Arg::new("directory")
                    .short('d')
                    .long("directory")
                    .help("create a directory instead of a file")
                    .action(ArgAction::SetTrue),
                Arg::new("tmpdir")
                    .short('p')
                    .long("tmpdir")
                    .help("specify the directory to create temporary files in")
                    .value_hint(ValueHint::DirPath)
                    .num_args(1),
                Arg::new("prefix")
                    .short('t')
                    .long("template")
                    .help("specify a prefix to append to the created files")
                    .num_args(1),
                Arg::new("dryrun")
                    .short('u')
                    .long("dryrun")
                    .help("immediately remove created files and directories")
                    .action(ArgAction::SetTrue),
            ])
    }

    fn run(&self, matches: &clap::ArgMatches) -> Result<(), Box<dyn std::error::Error>> {
        let mut path = if let Some(t) = matches.get_one::<String>("tmpdir") {
            PathBuf::from(t)
        } else {
            PathBuf::from("/tmp")
        };
        let fname = if let Some(p) = matches.get_one::<String>("prefix") {
            format!("{p}.XXXXXX")
        } else {
            "mktemp.XXXXXX".to_string()
        };
        path.push(&fname);
        let fname = path
            .to_str()
            .ok_or(io::Error::new(io::ErrorKind::Other, "utf8 error"))?;
        let cname = CString::new(fname)?;
        let ptr = cname.into_raw();
        if matches.get_flag("directory") {
            let raw_fd = unsafe { libc::mkdtemp(ptr) };
            if raw_fd.is_null() {
                return Err(io::Error::last_os_error().into());
            }
            let cname = unsafe { CString::from_raw(ptr) };
            let fname = cname.to_str()?;
            println!("{fname}");
            if matches.get_flag("dryrun") {
                fs::remove_dir(&fname)?;
            }
        } else {
            let raw_fd = unsafe { libc::mkstemp(ptr) };
            if raw_fd == -1 {
                return Err(io::Error::last_os_error().into());
            }
            let cname = unsafe { CString::from_raw(ptr) };
            let fname = cname.to_str()?;
            println!("{fname}");
            if matches.get_flag("dryrun") {
                fs::remove_file(&fname)?;
            }
        }
        Ok(())
    }

    fn path(&self) -> Option<shitbox::Path> {
        Some(shitbox::Path::UsrBin)
    }
}