use nom::character::complete::anychar;
use nom::combinator::not;
use nom::combinator::recognize;
use nom::combinator::verify;
use nom::multi::many1;
use nom::multi::many_till;
use nom::sequence::preceded;

use super::Context;
use crate::error::Res;
use crate::parser::object::CitationReference;
use crate::parser::object_parser::minimal_set_object;
use crate::parser::parser_context::CitationBracket;
use crate::parser::parser_context::ContextElement;
use crate::parser::parser_with_context::parser_with_context;
use crate::parser::util::exit_matcher_parser;
use crate::parser::util::not_yet_implemented;
use crate::parser::util::WORD_CONSTITUENT_CHARACTERS;
use crate::parser::Object;

#[tracing::instrument(ret, level = "debug")]
pub fn citation_reference<'r, 's>(
    context: Context<'r, 's>,
    input: &'s str,
) -> Res<&'s str, CitationReference<'s>> {
    not_yet_implemented()?;
    todo!()
}

#[tracing::instrument(ret, level = "debug")]
fn key<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
    let (remaining, source) = recognize(many1(verify(
        preceded(
            not(parser_with_context!(exit_matcher_parser)(context)),
            anychar,
        ),
        |c| WORD_CONSTITUENT_CHARACTERS.contains(*c) || "-.:?~`'/*@+|(){}<>&_^$#%~".contains(*c),
    )))(input)?;
    Ok((remaining, source))
}

#[tracing::instrument(ret, level = "debug")]
fn key_suffix<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Vec<Object<'s>>> {
    // TODO: Add to context with the depth object and an exit matcher
    let (remaining, (children, _exit_contents)) = verify(
        many_till(
            parser_with_context!(minimal_set_object)(context),
            parser_with_context!(exit_matcher_parser)(context),
        ),
        |(children, _exit_contents)| !children.is_empty(),
    )(input)?;
    todo!()
}

#[tracing::instrument(ret, level = "debug")]
fn get_bracket_depth<'r, 's>(context: Context<'r, 's>) -> Option<&'r CitationBracket<'s>> {
    for node in context.iter() {
        match node.get_data() {
            ContextElement::CitationBracket(depth) => return Some(depth),
            _ => {}
        }
    }
    None
}