use lazy_static::lazy_static;
use regex::Regex;

use super::ast::DiscordComponent;

pub fn parse_link(text: &'_ str) -> Option<(DiscordComponent<'_>, usize)> {
    lazy_static! {
        static ref LINK: Regex =
            Regex::new(r#"^((?:https?|steam)://[^\s<]+[^<.,:;"'\]\s])"#).unwrap();
    }

    if let Some(caps) = LINK.captures(text) {
        let mut link_range = caps.get(0).unwrap().range();
        let orig_link = &text[link_range.clone()];

        if orig_link.ends_with(')') {
            let mut bracket_balance: i16 = 0;
            for c in orig_link.chars() {
                if c == '(' {
                    bracket_balance -= 1;
                } else if c == ')' {
                    bracket_balance += 1;
                }
            }

            if bracket_balance > 0 {
                link_range = link_range.start..(link_range.end - 1);
            }
        }

        let link = &text[link_range];
        return Some((DiscordComponent::Link(link), link.len()));
    }

    // TODO(Charlotte): Parse links
    None
}