use std::fs;
use std::os::unix::fs::PermissionsExt;

pub fn print_template(output: &Option<String>) {
    let script = get_script_template();
    match output {
        None => {
            println!("{}", script);
        }
        Some(output_file) => {
            if fs::metadata(output_file).is_ok() {
                failure!("Output script file exists: {}", output_file);
            } else {
                match fs::write(output_file, script) {
                    Ok(_) => {
                        success!("Write script file success: {}", output_file);
                        let _ = fs::set_permissions(output_file, PermissionsExt::from_mode(0o755));
                    }
                    Err(e) => {
                        failure!("Write script file: {}, failed: {}", output_file, e);
                    }
                }
            }
        }
    }
}

#[allow(unreachable_code)]
fn get_script_template() -> &'static str {
    #[cfg(feature = "switch-rust-lang")]
    return include_str!("script.template.rs");
    #[cfg(feature = "switch-go-lang")]
    return include_str!("script.template.go");
    #[cfg(feature = "switch-ts-lang")]
    return include_str!("script.template.ts");
    #[cfg(feature = "switch-dart-lang")]
    return include_str!("script.template.dart");
    panic!("Unknown feature assigned.");
}