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

/// `@start[a-z]*(id=MY_OWN_ID)` | `@start[a-z]* MY_OWN_ID` (e.g. `@startuml`)
#[derive(Clone, Debug)]
pub struct StartLine {
    token: StartDiagramToken,
}

impl StartLine {
    /// parse like `" @startuml\n"`, `" @startuml ID\n"`, `" @startuml(id=ID)\n"`
    pub fn parse(input: ParseContainer) -> IResult<ParseContainer, (Vec<ParseContainer>, Self)> {
        let (rest, parsed) = tuple((
            wr!(space0),
            StartDiagramToken::parse,
            wr!(space0),
            alt((wr!(eof), wr!(line_ending))),
        ))(input)?;

        let (token_raws, token_parsed) = parsed.1;

        let ret0 = [parsed.0]
            .into_iter()
            .chain(token_raws)
            .chain([parsed.2, parsed.3])
            .collect();

        let ret1 = Self {
            token: token_parsed,
        };

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

    pub fn diagram_kind(&self) -> &str {
        self.token.diagram_kind()
    }

    pub fn id(&self) -> Option<&str> {
        self.token.id()
    }
}

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

    #[test]
    fn test_parse_start_line() -> anyhow::Result<()> {
        let testdata = "@startuml\n";
        let (rest, (parsed, StartLine { token })) = StartLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(token.diagram_kind(), "uml");
        assert_eq!(token.id(), None);

        let testdata = " \t@startuml\n";
        let (rest, (parsed, StartLine { token })) = StartLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(token.diagram_kind(), "uml");
        assert_eq!(token.id(), None);

        let testdata = "@startuml \t\n";
        let (rest, (parsed, StartLine { token })) = StartLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(token.diagram_kind(), "uml");
        assert_eq!(token.id(), None);

        let testdata = " \t@startuml \t\n";
        let (rest, (parsed, StartLine { token })) = StartLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(token.diagram_kind(), "uml");
        assert_eq!(token.id(), None);

        let testdata = " \t@startuml id_foo\t\n";
        let (rest, (parsed, StartLine { token })) = StartLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(token.diagram_kind(), "uml");
        assert_eq!(token.id(), Some("id_foo"));

        let testdata = " \t@startuml(id=id_bar)\t\n";
        let (rest, (parsed, token)) = StartLine::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(testdata, parsed.join(""));
        assert_eq!(token.diagram_kind(), "uml");
        assert_eq!(token.id(), Some("id_bar"));

        Ok(())
    }
}