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

use super::ast::DiscordComponent;

pub fn parse_code_block(text: &'_ str) -> Option<(DiscordComponent<'_>, usize)> {
    lazy_static! {
        static ref CODE_BLOCK: Regex =
            Regex::new(r"^```(?P<lang>.+)?\n(?P<source>.*?)\n```").unwrap();
    }

    if let Some(caps) = CODE_BLOCK.captures(text) {
        let lang = caps.name("lang").map(|m| m.as_str());
        let source = caps.name("source").unwrap().as_str();
        let whole_len = caps.get(0).unwrap().as_str().len();

        return Some((DiscordComponent::CodeBlock { lang, source }, whole_len));
    }

    None
}

pub fn parse_code(text: &'_ str) -> Option<(DiscordComponent<'_>, usize)> {
    lazy_static! {
        static ref CODE: Regex = Regex::new(r"^`(?P<inner>.+?)`").unwrap();
    }

    if let Some(caps) = CODE.captures(text) {
        let inner = caps.name("inner").unwrap().as_str();
        let whole_len = caps.get(0).unwrap().as_str().len();

        return Some((DiscordComponent::Code(inner), whole_len));
    }

    None
}