use crate::error::ShellError;

pub fn parse_line(line: &str) -> Result<(&str, Vec<String>), ShellError> {
    let (keyword, unparsed_args) = line.split_once(' ').unwrap_or((line, ""));

    if let Some(args) = shlex::split(unparsed_args) {
        Ok((keyword, args))
    } else {
        Err(ShellError::MalformedArgs(unparsed_args.to_string()))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_single() {
        assert_eq!(parse_line("keyword"), Ok(("keyword", vec![])))
    }

    #[test]
    fn test_parse_multiple() {
        assert_eq!(
            parse_line("keyword arg1 arg2"),
            Ok(("keyword", vec!["arg1".to_string(), "arg2".to_string()]))
        )
    }

    #[test]
    fn test_parse_complex() {
        assert_eq!(
            parse_line("keyword 'this is arg 1' arg2 \"arg3 \""),
            Ok((
                "keyword",
                vec![
                    "this is arg 1".to_string(),
                    "arg2".to_string(),
                    "arg3 ".to_string()
                ]
            ))
        )
    }

    #[test]
    fn test_parse_malformed() {
        assert_eq!(
            parse_line("keyword \"malformed"),
            Err(ShellError::MalformedArgs("keyword \"malformed".to_string()))
        )
    }
}