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use crate::DiagramIdToken;
use crate::{wr, ParseContainer};
use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::{alpha1, space1};
use nom::sequence::tuple;
use nom::IResult;

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

impl StartDiagramToken {
    /// parse like `" @startuml\n"`, `" @startuml ID\n"`, `" @startuml(id=ID)\n"`
    pub fn parse(input: ParseContainer) -> IResult<ParseContainer, (Vec<ParseContainer>, Self)> {
        let (rest, (start, diagram_kind, (id_raw, id))) =
            tuple((wr!(tag("@start")), wr!(alpha1), parse_id_part))(input)?;

        let ret0 = [start, diagram_kind.clone()]
            .into_iter()
            .chain(id_raw)
            .collect();
        let ret1 = Self { diagram_kind, id };

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

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

    pub fn id(&self) -> Option<&str> {
        self.id.as_ref().map(|x| x.id())
    }
}

/// parse like `" ID"` or `"(id=ID)"`, `""`
fn parse_id_part(
    input: ParseContainer,
) -> IResult<ParseContainer, (Vec<ParseContainer>, Option<DiagramIdToken>)> {
    alt((parse_spaced_id, parse_parened_id, parse_none))(input)
}

/// parse like `"@startuml ID"`
fn parse_spaced_id(
    input: ParseContainer,
) -> IResult<ParseContainer, (Vec<ParseContainer>, Option<DiagramIdToken>)> {
    let (input, (space, (id_raw, id))) = tuple((wr!(space1), DiagramIdToken::parse))(input)?;
    let parsed = Vec::from([space, id_raw]);
    Ok((input, (parsed, Some(id))))
}

/// parse like `"@startuml(id=ID)"`
fn parse_parened_id(
    input: ParseContainer,
) -> IResult<ParseContainer, (Vec<ParseContainer>, Option<DiagramIdToken>)> {
    let (input, (open, (id_raw, id), close)) =
        tuple((wr!(tag("(id=")), DiagramIdToken::parse, wr!(tag(")"))))(input)?;
    let parsed = Vec::from([open, id_raw, close]);
    Ok((input, (parsed, Some(id))))
}

/// parse like `"@startuml"`
fn parse_none(
    input: ParseContainer,
) -> IResult<ParseContainer, (Vec<ParseContainer>, Option<DiagramIdToken>)> {
    Ok((input, (vec![], None)))
}

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

    #[test]
    fn test_parse() -> anyhow::Result<()> {
        let testdata = "@startuml";
        let (rest, (raws, StartDiagramToken { diagram_kind, id })) =
            StartDiagramToken::parse(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(raws.join(""), testdata);
        assert_eq!(diagram_kind, "uml");
        assert!(id.is_none());

        let testdata = "@startjson \t\n";
        let (rest, (raws, StartDiagramToken { diagram_kind, id })) =
            StartDiagramToken::parse(testdata.into())?;
        assert_eq!(rest, " \t\n");
        assert_eq!(raws.join(""), "@startjson");
        assert_eq!(format!("{}{rest}", raws.join("")), testdata);
        assert_eq!(diagram_kind, "json");
        assert!(id.is_none());

        let testdata = "@startuml \t id aaa\n";
        let (rest, (raws, StartDiagramToken { diagram_kind, id })) =
            StartDiagramToken::parse(testdata.into())?;
        assert_eq!(rest, " aaa\n");
        assert_eq!(raws.join(""), "@startuml \t id");
        assert_eq!(format!("{}{rest}", raws.join("")), testdata);
        assert_eq!(diagram_kind, "uml");
        assert_eq!(id.as_ref().map(|x| x.id()), Some("id"));

        let testdata = "@startuml(id=foo_BAR) bbb\n";
        let (rest, (raws, StartDiagramToken { diagram_kind, id })) =
            StartDiagramToken::parse(testdata.into())?;
        assert_eq!(rest, " bbb\n");
        assert_eq!(raws.join(""), "@startuml(id=foo_BAR)");
        assert_eq!(format!("{}{rest}", raws.join("")), testdata);
        assert_eq!(diagram_kind, "uml");
        assert_eq!(id.as_ref().map(|x| x.id()), Some("foo_BAR"));

        Ok(())
    }

    #[test]
    fn test_parse_id_part() -> anyhow::Result<()> {
        let testdata = "";
        let (rest, (parsed, id)) = parse_id_part(testdata.into())?;
        assert_eq!(rest, "");
        assert_eq!(parsed.join(""), testdata);
        assert!(id.is_none());

        let testdata = " aaa  ";
        let (rest, (parsed, id)) = parse_id_part(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed.join(""), " aaa");
        assert_eq!(format!("{}{rest}", parsed.join("")), testdata);
        assert_eq!(id.as_ref().map(|x| x.id()), Some("aaa"));

        let testdata = "(id=FOO_bar) \txxx";
        let (rest, (parsed, id)) = parse_id_part(testdata.into())?;
        assert_eq!(rest, " \txxx");
        assert_eq!(parsed.join(""), "(id=FOO_bar)");
        assert_eq!(format!("{}{rest}", parsed.join("")), testdata);
        assert_eq!(id.as_ref().map(|x| x.id()), Some("FOO_bar"));

        Ok(())
    }

    #[test]
    fn test_parse_spaced_id() -> anyhow::Result<()> {
        let testdata = " aaa  ";
        let (rest, (parsed, id)) = parse_spaced_id(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed.join(""), " aaa");
        assert_eq!(format!("{}{rest}", parsed.join("")), testdata);
        assert_eq!(id.as_ref().map(|x| x.id()), Some("aaa"));

        Ok(())
    }

    #[test]
    fn test_parse_parened_id() -> anyhow::Result<()> {
        let testdata = "(id=FOO_bar) \txxx";
        let (rest, (parsed, id)) = parse_parened_id(testdata.into())?;
        assert_eq!(rest, " \txxx");
        assert_eq!(parsed.join(""), "(id=FOO_bar)");
        assert_eq!(format!("{}{rest}", parsed.join("")), testdata);
        assert_eq!(id.as_ref().map(|x| x.id()), Some("FOO_bar"));

        Ok(())
    }

    #[test]
    fn test_parse_none() -> anyhow::Result<()> {
        let testdata = "  ";
        let (rest, (parsed, id)) = parse_none(testdata.into())?;
        assert_eq!(rest, "  ");
        assert_eq!(parsed.join(""), "");
        assert_eq!(format!("{}{rest}", parsed.join("")), testdata);
        assert!(id.is_none());

        Ok(())
    }
}