use regex::Regex;
use std::{ffi::OsString, fs::read_dir};
pub fn emoji_pass(
    markdown: &str,
    emoji_web_directory: &String,
    emoji_local_directory: &String,
) -> String {
    let mut markdown = markdown.to_owned();
    let re_emojis = Regex::new(r":\w+:").unwrap();

    for emoji in re_emojis.find_iter(&markdown.clone()) {
        let emoji_file_name =
            get_emoji_file_name(&get_emoji_name(emoji.as_str()), emoji_local_directory);
        if emoji_file_name.is_none() {
            continue;
        }
        let html_string = format!(
            "<img class=\"emoji\" src=\"{emoji_web_directory}/{}\"><img>",
            emoji_file_name.unwrap().to_str().unwrap()
        );
        markdown = markdown.replacen(emoji.as_str(), &html_string, 1);
    }

    markdown
}

fn get_emoji_name(emoji_match: &str) -> String {
    emoji_match.replace(':', "")
}

fn get_emoji_file_name(emoji_name: &String, emoji_local_directory: &String) -> Option<OsString> {
    let all_emojis = read_dir(emoji_local_directory).expect("Failed to read emoji dir");
    for e in all_emojis {
        let e = e.unwrap();
        if OsString::from(emoji_name) == e.path().file_stem().unwrap() {
            return Some(e.file_name());
        }
    }
    eprintln!("WARNING: No emoji found for {emoji_name} did you add it to your emoji dir?");
    None
}