package de.nclazz.commons.io;

import lombok.NonNull;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Simple implementation of a MimeType.
 */
public class MimeType {

    public static final String MEDIA_APPLICATION = "application";
    public static final String MEDIA_AUDIO = "audio";
    public static final String MEDIA_EXAMPLE = "example";
    public static final String MEDIA_IMAGE = "image";
    public static final String MEDIA_MESSAGE = "message";
    public static final String MEDIA_MODEL = "model";
    public static final String MEDIA_MULTIPART = "multipart";
    public static final String MEDIA_TEXT = "text";
    public static final String MEDIA_VIDEO = "video";

    private static final Pattern MIME_REGEX = Pattern.compile("^(?<media>\\p{Alnum}+)/(?<sub>\\p{Alnum}+)$");

    private final String mediaType;
    private final String subType;

    public MimeType(String mediaType, String subType) {
        this.mediaType = mediaType;
        this.subType = subType;
    }

    public String getMediaType() {
        return mediaType;
    }

    public String getSubType() {
        return subType;
    }

    @Override
    public String toString() {
        return String.format("%s/%s", this.mediaType, this.subType);
    }

    public static MimeType parse(@NonNull String mime) {
        Matcher matcher = MIME_REGEX.matcher(mime);
        if(!matcher.matches()) {
            throw new IllegalArgumentException(String.format("Invalid MimeType '%s'!", mime));
        }
        return new MimeType(matcher.group("media"), matcher.group("sub"));
    }

}