use std::collections::BTreeMap;

use nom::bytes::complete::tag;
use nom::bytes::complete::take_until;
use nom::character::complete::anychar;
use nom::combinator::all_consuming;
use nom::combinator::eof;
use nom::combinator::map;
use nom::combinator::map_parser;
use nom::combinator::opt;
use nom::combinator::peek;
use nom::combinator::recognize;
use nom::multi::many0;
use nom::multi::many_till;
use nom::sequence::tuple;

use super::object_parser::standard_set_object;
use super::util::confine_context;
use crate::context::parser_with_context;
use crate::context::Context;
use crate::context::ContextElement;
use crate::context::GlobalSettings;
use crate::context::List;
use crate::types::AffiliatedKeywordValue;
use crate::types::AffiliatedKeywords;
use crate::types::Keyword;

pub(crate) fn parse_affiliated_keywords<'g, 's, AK>(
    global_settings: &'g GlobalSettings<'g, 's>,
    input: AK,
) -> AffiliatedKeywords<'s>
where
    AK: IntoIterator<Item = Keyword<'s>>,
{
    let mut ret = BTreeMap::new();
    for kw in input {
        let translated_name = translate_name(global_settings, kw.key);
        // if is_single_string_keyword(global_settings, translated_name.as_str()) {
        //     ret.insert(
        //         translated_name,
        //         AffiliatedKeywordValue::SingleString(kw.value),
        //     );
        // } else if is_list_of_single_string_keyword(global_settings, translated_name.as_str()) {
        //     let list_of_strings = ret
        //         .entry(translated_name)
        //         .or_insert_with(|| AffiliatedKeywordValue::ListOfStrings(Vec::with_capacity(1)));
        //     match list_of_strings {
        //         AffiliatedKeywordValue::ListOfStrings(list_of_strings)
        //             if list_of_strings.is_empty() =>
        //         {
        //             list_of_strings.push(kw.value);
        //         }
        //         AffiliatedKeywordValue::ListOfStrings(list_of_strings) => {
        //             list_of_strings.clear();
        //             list_of_strings.push(kw.value);
        //         }
        //         _ => panic!("Invalid AffiliatedKeywordValue type."),
        //     }
        // } else if is_list_of_objects_keyword(global_settings, translated_name.as_str()) {
        //     let initial_context = ContextElement::document_context();
        //     let initial_context = Context::new(global_settings, List::new(&initial_context));

        //     let (_remaining, optional_objects) = opt(all_consuming(map(
        //         tuple((
        //             take_until("["),
        //             tag("["),
        //             map_parser(
        //                 recognize(many_till(anychar, peek(tuple((tag("]"), eof))))),
        //                 confine_context(|i| {
        //                     all_consuming(many0(parser_with_context!(standard_set_object)(
        //                         &initial_context,
        //                     )))(i)
        //                 }),
        //             ),
        //             tag("]"),
        //             eof,
        //         )),
        //         |(_, _, objects, _, _)| objects,
        //     )))(kw.key.into())
        //     .expect("Object parser should always succeed.");

        //     // TODO: This should be omitting footnote references
        //     let (_remaining, objects) = all_consuming(many0(parser_with_context!(
        //         standard_set_object
        //     )(&initial_context)))(kw.value.into())
        //     .expect("Object parser should always succeed.");
        //     let list_of_lists = ret.entry(translated_name).or_insert_with(|| {
        //         AffiliatedKeywordValue::ListOfListsOfObjects(Vec::with_capacity(1))
        //     });
        //     match list_of_lists {
        //         AffiliatedKeywordValue::ListOfListsOfObjects(list_of_lists) => {
        //             list_of_lists.push((optional_objects, objects));
        //         }
        //         _ => panic!("Invalid AffiliatedKeywordValue type."),
        //     }
        // } else {
        //     let list_of_strings = ret
        //         .entry(translated_name)
        //         .or_insert_with(|| AffiliatedKeywordValue::ListOfStrings(Vec::with_capacity(1)));
        //     match list_of_strings {
        //         AffiliatedKeywordValue::ListOfStrings(list_of_strings) => {
        //             list_of_strings.push(kw.value);
        //         }
        //         _ => panic!("Invalid AffiliatedKeywordValue type."),
        //     }
        // }
    }
    AffiliatedKeywords { keywords: ret }
}

fn translate_name<'g, 's>(global_settings: &'g GlobalSettings<'g, 's>, name: &'s str) -> String {
    let name_until_optval = name
        .split_once("[")
        .map(|(before, _after)| before)
        .unwrap_or(name);
    for (src, dst) in global_settings.element_keyword_translation_alist {
        if name_until_optval.eq_ignore_ascii_case(src) {
            return dst.to_lowercase();
        }
    }
    name_until_optval.to_lowercase()
}

fn is_single_string_keyword<'g, 's>(
    _global_settings: &'g GlobalSettings<'g, 's>,
    name: &'s str,
) -> bool {
    // TODO: Is this defined by an elisp variable?
    for single_string_name in ["plot", "name"] {
        if name.eq_ignore_ascii_case(single_string_name) {
            return true;
        }
    }
    false
}

fn is_list_of_single_string_keyword<'g, 's>(
    _global_settings: &'g GlobalSettings<'g, 's>,
    name: &'s str,
) -> bool {
    // TODO: Is this defined by an elisp variable?
    for single_string_name in ["results"] {
        if name.eq_ignore_ascii_case(single_string_name) {
            return true;
        }
    }
    false
}

fn is_list_of_objects_keyword<'g, 's>(
    global_settings: &'g GlobalSettings<'g, 's>,
    name: &'s str,
) -> bool {
    for parsed_keyword in global_settings.element_parsed_keywords {
        if name.eq_ignore_ascii_case(parsed_keyword) {
            return true;
        }
    }
    false
}