use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::space0;
use nom::combinator::recognize;
use nom::sequence::tuple;

use super::Context;
use crate::error::Res;
use crate::parser::parser_with_context::parser_with_context;
use crate::parser::StatisticsCookie;

#[tracing::instrument(ret, level = "debug")]
pub fn statistics_cookie<'r, 's>(
    context: Context<'r, 's>,
    input: &'s str,
) -> Res<&'s str, StatisticsCookie<'s>> {
    alt((
        parser_with_context!(percent_statistics_cookie)(context),
        parser_with_context!(fraction_statistics_cookie)(context),
    ))(input)
}

#[tracing::instrument(ret, level = "debug")]
pub fn percent_statistics_cookie<'r, 's>(
    context: Context<'r, 's>,
    input: &'s str,
) -> Res<&'s str, StatisticsCookie<'s>> {
    let (remaining, source) =
        recognize(tuple((tag("["), nom::character::complete::u64, tag("%]"))))(input)?;
    let (remaining, _) = space0(remaining)?;
    Ok((remaining, StatisticsCookie { source }))
}

#[tracing::instrument(ret, level = "debug")]
pub fn fraction_statistics_cookie<'r, 's>(
    context: Context<'r, 's>,
    input: &'s str,
) -> Res<&'s str, StatisticsCookie<'s>> {
    let (remaining, source) = recognize(tuple((
        tag("["),
        nom::character::complete::u64,
        tag("/"),
        nom::character::complete::u64,
        tag("]"),
    )))(input)?;
    let (remaining, _) = space0(remaining)?;
    Ok((remaining, StatisticsCookie { source }))
}