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use crate::{wr, ParseContainer};
use nom::bytes::complete::take_while1;
use nom::character::is_alphanumeric;
use nom::IResult;

/// ID of `"@startuml ID"` or `"@startuml(id=ID)"`
#[derive(Clone, Debug)]
pub struct DiagramIdToken {
    id: ParseContainer,
}

impl DiagramIdToken {
    pub fn parse(input: ParseContainer) -> IResult<ParseContainer, (ParseContainer, Self)> {
        let (rest, id) = wr!(take_while1(|c: char| is_alphanumeric(c as u8) || '_' == c))(input)?;
        Ok((rest, (id.clone(), Self { id })))
    }

    pub fn id(&self) -> &str {
        self.id.as_str()
    }
}

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

    #[test]
    fn test_parse() -> anyhow::Result<()> {
        assert!(DiagramIdToken::parse("".into()).is_err());
        assert!(DiagramIdToken::parse(" ".into()).is_err());

        let testdata = "aaa  ";
        let (rest, (parsed, id)) = DiagramIdToken::parse(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed, "aaa");
        assert_eq!(id.id(), "aaa");

        Ok(())
    }
}