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

use tempfile::TempDir;

fn sandbox(extra_args: &[&str]) -> Command {
    let mut cmd = Command::new(env!("CARGO_BIN_EXE_agent-sandbox"));
    cmd.args(extra_args);
    cmd
}

#[test]
fn cwd_is_writable() {
    let output = sandbox(&[])
        .args(["--", "bash", "-c", "touch ./sandbox_canary && echo ok"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        stdout.contains("ok"),
        "expected 'ok' in stdout, got: {stdout}"
    );
}

#[test]
fn host_fs_is_readonly() {
    let output = sandbox(&[])
        .args(["--", "bash", "-c", "touch /etc/pwned 2>&1 || echo readonly"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        stdout.contains("readonly"),
        "expected 'readonly' in stdout, got: {stdout}"
    );
    assert!(!std::path::Path::new("/etc/pwned").exists());
}

#[test]
fn ssh_dir_is_hidden() {
    let output = sandbox(&[])
        .args(["--", "bash", "-c", "ls ~/.ssh 2>/dev/null | wc -l"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout).trim().to_string();
    assert_eq!(stdout, "0", "expected empty ~/.ssh, got {stdout} entries");
}

#[test]
fn no_net_blocks_network() {
    let output = sandbox(&["--no-net"])
        .args([
            "--",
            "bash",
            "-c",
            "curl -s --max-time 2 http://1.1.1.1 2>&1; echo $?",
        ])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        !stdout.trim().ends_with("0"),
        "expected curl to fail, got: {stdout}"
    );
}

#[test]
fn hardened_pid_namespace() {
    let output = sandbox(&["--hardened"])
        .args(["--", "bash", "-c", "ls /proc | grep -cE '^[0-9]+$'"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let count: u32 = String::from_utf8_lossy(&output.stdout)
        .trim()
        .parse()
        .unwrap_or(999);
    assert!(
        count < 10,
        "expected isolated PID namespace with few PIDs, got {count}"
    );
}

#[test]
fn whitelist_hides_home_contents() {
    let output = sandbox(&["--whitelist"])
        .args(["--", "bash", "-c", "ls ~/Documents 2>&1 || echo hidden"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        stdout.contains("hidden"),
        "expected ~/Documents to be hidden, got: {stdout}"
    );
}

#[test]
fn extra_ro_mount() {
    let dir = TempDir::new().expect("failed to create temp dir");
    fs::write(dir.path().join("hello.txt"), "hi").expect("failed to write test file");
    let dir_str = dir.path().to_str().unwrap();

    let output = sandbox(&["--ro", dir_str])
        .args([
            "--",
            "bash",
            "-c",
            &format!("cat {dir_str}/hello.txt && touch {dir_str}/new 2>&1 || echo readonly"),
        ])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        stdout.contains("hi"),
        "expected file content 'hi', got: {stdout}"
    );
    assert!(
        stdout.contains("readonly"),
        "expected ro mount to block writes, got: {stdout}"
    );
}

#[test]
fn extra_rw_mount() {
    let dir = TempDir::new().expect("failed to create temp dir");
    let dir_str = dir.path().to_str().unwrap();

    let output = sandbox(&["--rw", dir_str])
        .args([
            "--",
            "bash",
            "-c",
            &format!("touch {dir_str}/canary && echo ok"),
        ])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("ok"), "expected 'ok', got: {stdout}");
    assert!(
        dir.path().join("canary").exists(),
        "canary file should exist on host after rw mount"
    );
}

#[test]
fn chdir_override() {
    let dir = TempDir::new().expect("failed to create temp dir");
    let dir_str = dir.path().to_str().unwrap();

    let output = sandbox(&["--chdir", dir_str])
        .args(["--", "bash", "-c", "pwd"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout).trim().to_string();
    assert_eq!(
        stdout, dir_str,
        "expected cwd to be {dir_str}, got: {stdout}"
    );
}

#[test]
fn chdir_under_hardened_tmp() {
    let dir = TempDir::new().expect("failed to create temp dir");
    let dir_str = dir.path().to_str().unwrap();

    let output = sandbox(&["--hardened", "--chdir", dir_str])
        .args(["--", "bash", "-c", "pwd && touch ./ok && echo done"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        stdout.contains("done"),
        "expected chdir under /tmp to work with --hardened, got: {stdout}"
    );
}

#[test]
fn dry_run_prints_and_exits() {
    let output = sandbox(&["--dry-run"])
        .args(["--", "bash", "-c", "exit 42"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(
        stdout.contains("bwrap"),
        "expected bwrap command in dry-run output, got: {stdout}"
    );
    assert!(
        output.status.success(),
        "dry-run should exit 0, not 42 from the inner command"
    );
}

#[test]
fn rw_missing_path_errors() {
    let output = sandbox(&["--rw", "/nonexistent/xyz"])
        .args(["--", "true"])
        .output()
        .expect("agent-sandbox binary failed to execute");

    assert!(
        !output.status.success(),
        "expected non-zero exit for missing --rw path"
    );
    let stderr = String::from_utf8_lossy(&output.stderr);
    assert!(
        stderr.contains("/nonexistent/xyz"),
        "expected path in error message, got: {stderr}"
    );
}