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use crate::IncludeSpecifierToken;
use crate::{wr, ParseContainer};
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::space1;
use nom::sequence::tuple;
use nom::IResult;

/// `"!include foo.puml"` or `"!include bar.iuml!buz"` , `"!include_many foo.puml"` or `"!include_many bar.iuml!buz"`
#[derive(Clone, Debug)]
pub struct IncludeToken {
    specifier: IncludeSpecifierToken,
    kind: IncludeKind,
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum IncludeKind {
    Include,
    IncludeMany,
    IncludeOnce,
}

impl IncludeToken {
    /// parse like `"!include foo.puml"` or `"!include bar.iuml!buz"`
    pub fn parse(input: ParseContainer) -> IResult<ParseContainer, (Vec<ParseContainer>, Self)> {
        let (rest, (include, spaces, (specifier_raws, specifier))) = tuple((
            alt((
                wr!(tag("!include_many")),
                wr!(tag("!include_once")),
                wr!(tag("!include")),
            )),
            wr!(space1),
            IncludeSpecifierToken::parse,
        ))(input)?;

        let kind = match include.as_str() {
            "!include" => IncludeKind::Include,
            "!include_many" => IncludeKind::IncludeMany,
            "!include_once" => {
                tracing::warn!("Multiple include errors with `include_once` are not supported.");
                IncludeKind::IncludeOnce
            }

            _ => unreachable!("IncludeToken"),
        };

        let ret0 = [include, spaces]
            .into_iter()
            .chain(specifier_raws)
            .collect();
        let ret1 = Self { specifier, kind };

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

    pub fn filepath(&self) -> &str {
        self.specifier.filepath()
    }

    pub fn index(&self) -> Option<usize> {
        self.specifier.index()
    }

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

    pub fn kind(&self) -> &IncludeKind {
        &self.kind
    }
}

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

    #[test]
    fn test_parse() -> anyhow::Result<()> {
        let testdata = "!include foo.puml  ";
        let (rest, (parsed, include)) = IncludeToken::parse(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed.join(""), "!include foo.puml");
        assert_eq!(include.filepath(), "foo.puml");
        assert!(include.id().is_none());
        assert_eq!(include.kind(), &IncludeKind::Include);

        let testdata = "!include foo.puml!bar   ";
        let (rest, (parsed, include)) = IncludeToken::parse(testdata.into())?;
        assert_eq!(rest, "   ");
        assert_eq!(parsed.join(""), "!include foo.puml!bar");
        assert_eq!(include.filepath(), "foo.puml");
        assert_eq!(include.id(), Some("bar"));
        assert_eq!(include.kind(), &IncludeKind::Include);

        let testdata = "!include_many foo.puml!bar  ";
        let (rest, (parsed, include)) = IncludeToken::parse(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed.join(""), "!include_many foo.puml!bar");
        assert_eq!(include.filepath(), "foo.puml");
        assert_eq!(include.id(), Some("bar"));
        assert_eq!(include.kind(), &IncludeKind::IncludeMany);

        let testdata = "!include_once foo.puml!bar  ";
        let (rest, (parsed, include)) = IncludeToken::parse(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed.join(""), "!include_once foo.puml!bar");
        assert_eq!(include.filepath(), "foo.puml");
        assert_eq!(include.id(), Some("bar"));
        assert_eq!(include.kind(), &IncludeKind::IncludeOnce);

        Ok(())
    }
}