use nom::branch::alt;
use nom::bytes::complete::is_not;
use nom::bytes::complete::tag;
use nom::bytes::complete::tag_no_case;
use nom::character::complete::line_ending;
use nom::character::complete::space0;
use nom::character::complete::space1;
use nom::combinator::eof;
use nom::multi::separated_list1;
use nom::sequence::tuple;

use super::Context;
use crate::error::Res;
use crate::parser::lesser_element::Planning;
use crate::parser::util::get_consumed;
use crate::parser::util::start_of_line;

#[tracing::instrument(ret, level = "debug")]
pub fn planning<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Planning<'s>> {
    start_of_line(context, input)?;
    let (remaining, _leading_whitespace) = space0(input)?;
    let (remaining, _planning_parameters) = separated_list1(space1, planning_parameter)(remaining)?;
    let (remaining, _trailing_ws) = tuple((space0, alt((line_ending, eof))))(remaining)?;

    let source = get_consumed(input, remaining);

    Ok((remaining, Planning { source }))
}

#[tracing::instrument(ret, level = "debug")]
fn planning_parameter<'s>(input: &'s str) -> Res<&'s str, &'s str> {
    let (remaining, _planning_type) = alt((
        tag_no_case("DEADLINE"),
        tag_no_case("SCHEDULED"),
        tag_no_case("CLOSED"),
    ))(input)?;
    let (remaining, _gap) = tuple((tag(":"), space1))(remaining)?;
    // TODO: Make this invoke the real timestamp parser.
    let (remaining, _timestamp) = tuple((tag("<"), is_not("\r\n>"), tag(">")))(remaining)?;
    let source = get_consumed(input, remaining);
    Ok((remaining, source))
}