use nom::bytes::complete::tag;
use nom::character::complete::space0;
use nom::combinator::not;
use nom::combinator::peek;
use nom::combinator::recognize;
use nom::multi::many_till;
use nom::sequence::tuple;

use super::Context;
use crate::parser::error::Res;
use crate::parser::exiting::ExitClass;
use crate::parser::greater_element::TableRow;
use crate::parser::parser_context::ContextElement;
use crate::parser::parser_context::ExitMatcherNode;
use crate::parser::parser_with_context::parser_with_context;
use crate::parser::util::exit_matcher_parser;
use crate::parser::util::get_consumed;
use crate::parser::util::maybe_consume_trailing_whitespace_if_not_exiting;
use crate::parser::util::start_of_line;
use crate::parser::Table;

/// Parse an org-mode-style table
///
/// This is not the table.el style.
#[tracing::instrument(ret, level = "debug")]
pub fn org_mode_table<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Table<'s>> {
    start_of_line(context, input)?;
    peek(tuple((space0, tag("|"))))(input)?;

    let parser_context = context
        .with_additional_node(ContextElement::ConsumeTrailingWhitespace(true))
        .with_additional_node(ContextElement::Context("table"))
        .with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
            class: ExitClass::Alpha,
            exit_matcher: &table_end,
        }));

    let org_mode_table_row_matcher = parser_with_context!(org_mode_table_row)(&parser_context);
    let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);

    let (remaining, (children, _exit_contents)) =
        many_till(org_mode_table_row_matcher, exit_matcher)(input)?;

    // TODO: Consume trailing formulas
    let (remaining, _trailing_ws) =
        maybe_consume_trailing_whitespace_if_not_exiting(context, remaining)?;
    let source = get_consumed(input, remaining);

    Ok((
        remaining,
        Table {
            source,
            children
        }
    ))
}

#[tracing::instrument(ret, level = "debug")]
fn table_end<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, &'s str> {
    start_of_line(context, input)?;
    recognize(tuple((space0, not(tag("|")))))(input)
}

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