package me.viper.teamplugin.util;

import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Utils {

    // Matches &#RRGGBB hex color codes
    private static final Pattern HEX_PATTERN = Pattern.compile("&#([A-Fa-f0-9]{6})");

    public static String formatIsoNow() {
        return DateTimeFormatter.ISO_INSTANT
                .withZone(ZoneId.systemDefault())
                .format(Instant.now());
    }

    /**
     * Formats an ISO timestamp into dd/MM/yyyy format.
     */
    public static String prettifyIso(String iso) {
        if (iso == null || iso.isEmpty()) return "—";
        try {
            Instant inst = Instant.parse(iso);
            DateTimeFormatter fmt = DateTimeFormatter.ofPattern("dd/MM/yyyy")
                    .withLocale(Locale.getDefault())
                    .withZone(ZoneId.systemDefault());
            return fmt.format(inst);
        } catch (Exception e) {
            return iso; // return as-is if parsing fails
        }
    }

    /**
     * Translates & color codes and &#RRGGBB hex codes into Minecraft format codes.
     * Hex usage in config: &#FF5500 → §x§F§F§5§5§0§0
     */
    public static String color(String s) {
        if (s == null) return "";
        // Process hex colors first: &#RRGGBB → §x§R§R§G§G§B§B
        Matcher m = HEX_PATTERN.matcher(s);
        StringBuffer sb = new StringBuffer();
        while (m.find()) {
            StringBuilder repl = new StringBuilder("§x");
            for (char c : m.group(1).toCharArray()) {
                repl.append('§').append(c);
            }
            m.appendReplacement(sb, repl.toString());
        }
        m.appendTail(sb);
        // Then translate remaining & codes
        return sb.toString().replace("&", "§");
    }

    /**
     * Replaces placeholder pairs in a template string.
     * e.g. replace(template, "%player%", "Steve", "%rank%", "Admin")
     */
    public static String replace(String template, String... pairs) {
        if (template == null) return "";
        String out = template;
        for (int i = 0; i + 1 < pairs.length; i += 2) {
            out = out.replace(pairs[i], pairs[i + 1]);
        }
        return out;
    }
}