/*
 * Copyright (c) 2026 Jonathan Perkin <jonathan@perkin.org.uk>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

use crate::sandbox::Sandbox;
use anyhow::{Context, bail};
use std::os::unix::process::CommandExt;
use std::path::Path;
use std::process::{Command, ExitStatus};

impl Sandbox {
    pub fn mount_bindfs(
        &self,
        src: &Path,
        dest: &Path,
        opts: &[&str],
    ) -> anyhow::Result<Option<ExitStatus>> {
        let cmd = "/sbin/mount";
        Ok(Some(
            Command::new(cmd)
                .arg("-F")
                .arg("lofs")
                .args(opts)
                .arg(src)
                .arg(dest)
                .process_group(0)
                .status()
                .context(format!("Unable to execute {}", cmd))?,
        ))
    }

    pub fn mount_devfs(
        &self,
        _src: &Path,
        _dest: &Path,
        _opts: &[&str],
    ) -> anyhow::Result<Option<ExitStatus>> {
        bail!("Use bind mounts for /dev")
    }

    pub fn mount_fdfs(
        &self,
        _src: &Path,
        dest: &Path,
        opts: &[&str],
    ) -> anyhow::Result<Option<ExitStatus>> {
        let cmd = "/sbin/mount";
        Ok(Some(
            Command::new(cmd)
                .arg("-F")
                .arg("fd")
                .args(opts)
                .arg("fd")
                .arg(dest)
                .process_group(0)
                .status()
                .context(format!("Unable to execute {}", cmd))?,
        ))
    }

    pub fn mount_nfs(
        &self,
        src: &Path,
        dest: &Path,
        opts: &[&str],
    ) -> anyhow::Result<Option<ExitStatus>> {
        let cmd = "/sbin/mount";
        Ok(Some(
            Command::new(cmd)
                .arg("-F")
                .arg("nfs")
                .args(opts)
                .arg(src)
                .arg(dest)
                .process_group(0)
                .status()
                .context(format!("Unable to execute {}", cmd))?,
        ))
    }

    pub fn mount_procfs(
        &self,
        _src: &Path,
        dest: &Path,
        opts: &[&str],
    ) -> anyhow::Result<Option<ExitStatus>> {
        let cmd = "/sbin/mount";
        Ok(Some(
            Command::new(cmd)
                .arg("-F")
                .arg("proc")
                .args(opts)
                .arg("/proc")
                .arg(dest)
                .process_group(0)
                .status()
                .context(format!("Unable to execute {}", cmd))?,
        ))
    }

    pub fn mount_tmpfs(
        &self,
        _src: &Path,
        dest: &Path,
        opts: &[&str],
    ) -> anyhow::Result<Option<ExitStatus>> {
        let cmd = "/sbin/mount";
        Ok(Some(
            Command::new(cmd)
                .arg("-F")
                .arg("tmpfs")
                .args(opts)
                .arg("swap")
                .arg(dest)
                .process_group(0)
                .status()
                .context(format!("Unable to execute {}", cmd))?,
        ))
    }

    /*
     * General unmount routine common to file system types that involve
     * mounted file systems.
     *
     * Use process_group(0) to put umount in its own process group.
     * This prevents it from receiving SIGINT when the user presses Ctrl+C,
     * ensuring cleanup can complete even during repeated interrupts.
     */
    fn unmount_common(&self, dest: &Path) -> anyhow::Result<()> {
        let mut cmd = Command::new("/sbin/umount");
        cmd.arg(dest).process_group(0);
        self.run_umount(&mut cmd, dest)
    }

    pub fn unmount_bindfs(&self, dest: &Path) -> anyhow::Result<()> {
        self.unmount_common(dest)
    }

    pub fn unmount_devfs(&self, dest: &Path) -> anyhow::Result<()> {
        self.unmount_common(dest)
    }

    pub fn unmount_fdfs(&self, dest: &Path) -> anyhow::Result<()> {
        self.unmount_common(dest)
    }

    pub fn unmount_nfs(&self, dest: &Path) -> anyhow::Result<()> {
        self.unmount_common(dest)
    }

    pub fn unmount_procfs(&self, dest: &Path) -> anyhow::Result<()> {
        self.unmount_common(dest)
    }

    pub fn unmount_tmpfs(&self, dest: &Path) -> anyhow::Result<()> {
        self.unmount_common(dest)
    }

    /**
     * Format process info for a list of PIDs using pargs.
     *
     * illumos ps truncates command lines, so pargs is used instead.
     */
    pub(super) fn format_process_info(&self, pids: &[String]) -> Option<String> {
        let mut info = Vec::new();
        for pid in pids {
            let pargs_output = Command::new("pargs").arg(pid).process_group(0).output();
            match pargs_output {
                Ok(out) => {
                    let stdout = String::from_utf8_lossy(&out.stdout);
                    let args: Vec<&str> = stdout
                        .lines()
                        .filter_map(|l| l.strip_prefix("argv["))
                        .filter_map(|l| l.split("]: ").nth(1))
                        .collect();
                    info.push(format!("pid={} cmd='{}'", pid, args.join(" ")));
                }
                Err(_) => info.push(format!("pid={}", pid)),
            }
        }
        if info.is_empty() {
            None
        } else {
            Some(info.join(", "))
        }
    }
}
