PlayHours/src/main/java/com/mrkayjaydee/playhours/events/MOTDValidator.java

package com.mrkayjaydee.playhours.events;

import com.mrkayjaydee.playhours.PlayHoursMod;
import net.minecraft.network.chat.Component;

/**
 * Validates and truncates MOTD to comply with Minecraft protocol limits.
 * Enforces: 2 lines maximum, ~59 characters per line.
 */
public final class MOTDValidator {
    private MOTDValidator() {}

    private static final int MINECRAFT_LINE_LIMIT = 59;
    private static final int MINECRAFT_MAX_LINES = 2;

    /**
     * Validates and truncates MOTD to comply with Minecraft protocol limits.
     * Minecraft MOTD: 2 lines max, ~59 characters per line
     * 
     * @param motd the MOTD component to validate
     * @return the validated/truncated MOTD component
     */
    public static Component validateAndTruncate(Component motd) {
        String text = motd.getString();
        String[] lines = text.split("\n", -1);
        
        // Limit to 2 lines maximum (Minecraft displays 2 lines in server list)
        if (lines.length > MINECRAFT_MAX_LINES) {
            PlayHoursMod.LOGGER.warn("MOTD has {} lines but Minecraft only displays {}. Truncating.", lines.length, MINECRAFT_MAX_LINES);
            lines = new String[]{lines[0], lines[1]};
        }
        
        // Truncate each line to ~59 characters (Minecraft MOTD line width limit)
        StringBuilder validatedMotd = new StringBuilder();
        
        for (int i = 0; i < lines.length; i++) {
            String line = lines[i];
            if (line.length() > MINECRAFT_LINE_LIMIT) {
                PlayHoursMod.LOGGER.warn("MOTD line {} is {} chars but Minecraft limit is ~{}. Truncating.", i + 1, line.length(), MINECRAFT_LINE_LIMIT);
                line = line.substring(0, Math.min(line.length(), MINECRAFT_LINE_LIMIT));
            }
            validatedMotd.append(line);
            if (i < lines.length - 1) {
                validatedMotd.append("\n");
            }
        }
        
        return Component.literal(validatedMotd.toString());
    }
}