use std::fs;
use std::process::Command;
use std::time::{SystemTime, UNIX_EPOCH};

fn unique_temp_dir(name: &str) -> std::path::PathBuf {
    let nanos = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .expect("system time")
        .as_nanos();
    std::env::temp_dir().join(format!("{name}-{}-{nanos}", std::process::id()))
}

#[test]
fn manpage_command_uses_synopsis_name() {
    let root = unique_temp_dir("inshellah-manpage-cli");
    fs::create_dir_all(&root).expect("temp dir");
    let manpage = root.join("btrfs-check.8");
    fs::write(
        &manpage,
        r#".SH SYNOPSIS
btrfs check [options] <device>
.SH OPTIONS
.TP
\fB\-\-repair\fR
try to repair the filesystem
"#,
    )
    .expect("write manpage");

    let output = Command::new(env!("CARGO_BIN_EXE_inshellah"))
        .arg("manpage")
        .arg(&manpage)
        .output()
        .expect("run inshellah manpage");

    assert!(
        output.status.success(),
        "stderr = {}",
        String::from_utf8_lossy(&output.stderr)
    );
    let stdout = String::from_utf8(output.stdout).expect("stdout");
    assert!(
        stdout.contains("export extern \"btrfs check\""),
        "stdout = {stdout}"
    );
    assert!(
        !stdout.contains("export extern \"btrfs-check\""),
        "stdout = {stdout}"
    );

    let _ = fs::remove_dir_all(root);
}

#[test]
fn manpage_command_strips_git_style_subcommand_prefixes() {
    let root = unique_temp_dir("inshellah-manpage-cli");
    fs::create_dir_all(&root).expect("temp dir");
    let manpage = root.join("git.1");
    fs::write(
        &manpage,
        r#".SH SYNOPSIS
git [--version] [--help] <command> [<args>]
.SH OPTIONS
.TP
\fB\-\-version\fR
show version
.SH "GIT COMMANDS"
.SS "Main porcelain commands"
.PP
.BR git-add (1)
.RS 4
Add file contents to the index.
.RE
"#,
    )
    .expect("write manpage");

    let output = Command::new(env!("CARGO_BIN_EXE_inshellah"))
        .arg("manpage")
        .arg(&manpage)
        .output()
        .expect("run inshellah manpage");

    assert!(
        output.status.success(),
        "stderr = {}",
        String::from_utf8_lossy(&output.stderr)
    );
    let stdout = String::from_utf8(output.stdout).expect("stdout");
    assert!(
        stdout.contains("export extern \"git add\""),
        "stdout = {stdout}"
    );
    assert!(
        !stdout.contains("export extern \"git git-add\""),
        "stdout = {stdout}"
    );

    let _ = fs::remove_dir_all(root);
}