package de.danoeh.antennapod.util;

import android.util.Log;

import org.apache.commons.lang3.StringUtils;

import de.danoeh.antennapod.BuildConfig;

/**
 * Provides methods for checking and editing a URL.
 */
public final class URLChecker {

    /**
     * Class shall not be instantiated.
     */
    private URLChecker() {
    }

    /**
     * Logging tag.
     */
    private static final String TAG = "URLChecker";

    /**
     * Checks if URL is valid and modifies it if necessary.
     *
     * @param url The url which is going to be prepared
     * @return The prepared url
     */
    public static String prepareURL(String url) {
        StringBuilder builder = new StringBuilder();
        url = StringUtils.trim(url);
        if (url.startsWith("feed://")) {
            if (BuildConfig.DEBUG) Log.d(TAG, "Replacing feed:// with http://");
            url = url.replaceFirst("feed://", "http://");
        } else if (url.startsWith("pcast://")) {
            if (BuildConfig.DEBUG) Log.d(TAG, "Replacing pcast:// with http://");
            url = url.replaceFirst("pcast://", "http://");
        } else if (url.startsWith("itpc")) {
            if (BuildConfig.DEBUG) Log.d(TAG, "Replacing itpc:// with http://");
            url = url.replaceFirst("itpc://", "http://");
        } else if (!(url.startsWith("http://") || url.startsWith("https://"))) {
            if (BuildConfig.DEBUG) Log.d(TAG, "Adding http:// at the beginning of the URL");
            builder.append("http://");
        }
        builder.append(url);

        return builder.toString();
    }
}