use nom::branch::alt;
use nom::error::VerboseError;
use nom::IResult;
use std::cell::RefCell;
use std::rc::Rc;

#[derive(Clone)]
pub struct NomContext<F>
where
    F: for<'a> FnMut(&'a str) -> IResult<&'a str, &'a str, VerboseError<&'a str>>,
{
    pub fail_matcher: F,

    /// You can't have nested bolds in org-mode
    pub can_match_bold: bool,
    pub can_match_link: bool,
}

impl<F> NomContext<F>
where
    F: for<'a> FnMut(&'a str) -> IResult<&'a str, &'a str, VerboseError<&'a str>>,
    F: Clone,
{
    pub fn new(fail_matcher: F) -> Self {
        NomContext {
            fail_matcher: fail_matcher,
            can_match_bold: true,
            can_match_link: true,
        }
    }

    pub fn without_bold(&self) -> Self {
        NomContext {
            fail_matcher: self.fail_matcher.clone(),
            can_match_bold: true,
            can_match_link: true,
        }
    }

    pub fn with_additional_fail_matcher<G>(
        self,
        additional_fail_matcher: G,
    ) -> NomContext<impl (for<'b> FnMut(&'b str) -> IResult<&'b str, &'b str, VerboseError<&'b str>>)>
    where
        G: for<'b> FnMut(&'b str) -> IResult<&'b str, &'b str, VerboseError<&'b str>>,
        G: Clone,
        // O: for<'b> FnMut(&'b str) -> IResult<&'b str, &'b str, VerboseError<&'b str>>,
        // O: Clone,
    {
        NomContext {
            fail_matcher: alt((additional_fail_matcher, self.fail_matcher)),
            can_match_bold: self.can_match_bold,
            can_match_link: self.can_match_link,
        }
    }
}