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use crate::{wr, ParseContainer};
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::{alpha1, line_ending, space0};
use nom::combinator::eof;
use nom::sequence::tuple;
use nom::IResult;

#[derive(Clone, Debug)]
pub struct EndLine {
    diagram_kind: ParseContainer,
}

impl EndLine {
    /// parse like `" @enduml\n"`
    pub fn parse(input: ParseContainer) -> IResult<ParseContainer, (Vec<ParseContainer>, Self)> {
        let (rest, parsed) = tuple((
            wr!(space0),
            wr!(tag("@end")),
            wr!(alpha1),
            wr!(space0),
            alt((wr!(eof), wr!(line_ending))),
        ))(input)?;

        let ret0 = Vec::from(<[ParseContainer; 5]>::from(parsed));
        let diagram_kind = ret0[2].clone();

        let ret1 = Self { diagram_kind };

        Ok((rest, (ret0, ret1)))
    }

    pub fn eq_diagram_kind(&self, diagram_kind: &str) -> bool {
        self.diagram_kind == diagram_kind
    }
}

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

    #[test]
    fn test_parse_end_line() -> anyhow::Result<()> {
        let testdata = "@enduml\n";
        let (rest, (parsed, EndLine { diagram_kind })) = EndLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(diagram_kind, "uml");

        let testdata = " \t@enduml\n";
        let (rest, (parsed, EndLine { diagram_kind })) = EndLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(diagram_kind, "uml");

        let testdata = "@enduml \t\n";
        let (rest, (parsed, EndLine { diagram_kind })) = EndLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(diagram_kind, "uml");

        let testdata = " \t@enduml \t\n";
        let (rest, (parsed, EndLine { diagram_kind })) = EndLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(diagram_kind, "uml");

        Ok(())
    }
}