WordPress/src/main/java/org/wordpress/android/ui/reader/utils/ReaderXPostUtils.java

package org.wordpress.android.ui.reader.utils;

import android.net.Uri;
import android.support.annotation.NonNull;
import android.text.Html;
import android.text.Spanned;

import org.wordpress.android.models.ReaderPost;

/**
 * Reader cross-post utility routines
 */

public class ReaderXPostUtils {

    // note that these strings don't need to be localized due to the intended audience
    private static final String UNKNOWN_SITE = "(unknown)";
    private static final String FMT_SITE_XPOST = "%1$s cross-posted from %2$s to %3$s";
    private static final String FMT_COMMENT_XPOST = "%1$s commented on %2$s, cross-posted to %3$s";

    /*
     * returns the title to display for this xpost, which is simply the post's title
     * without the "X-post: " prefix
     */
    public static String getXPostTitle(@NonNull ReaderPost post) {
        if (post.getTitle().startsWith("X-post: ")) {
            return post.getTitle().substring(8);
        } else {
            return post.getTitle();
        }
    }

    /*
     * returns the html subtitle to display for this xpost
     * ex: "Nick cross-posted from +blog1 to +blog2"
     * ex: "Nick commented on +blog1, cross-posted to +blog2"
     */
    public static Spanned getXPostSubtitleHtml(@NonNull ReaderPost post) {
        boolean isCommentXPost = post.getExcerpt().startsWith("X-comment");

        String name = post.hasAuthorFirstName() ? post.getAuthorFirstName() : post.getAuthorName();
        String subtitle = String.format(
                isCommentXPost ? FMT_COMMENT_XPOST : FMT_SITE_XPOST,
                "<strong>" + name + "</strong>",
                getFromSiteName(post),
                getToSiteName(post));

        return Html.fromHtml(subtitle);
    }

    // origin site name can be extracted from the excerpt,
    // example excerpt: "<p>X-post from +blog2: I have a request..."
    private static String getFromSiteName(@NonNull ReaderPost post) {
        String excerpt = post.getExcerpt();
        int plusPos = excerpt.indexOf("+");
        int colonPos = excerpt.indexOf(":", plusPos);
        if (plusPos > 0 && colonPos > 0) {
            return excerpt.substring(plusPos, colonPos);
        } else {
            return UNKNOWN_SITE;
        }
    }

    // destination site name is the subdomain of the blog url
    private static String getToSiteName(@NonNull ReaderPost post) {
        Uri uri = Uri.parse(post.getBlogUrl());
        String domain = uri.getHost();
        if (domain == null || !domain.contains(".")) {
            return "+" + UNKNOWN_SITE;
        }

        return  "+" + domain.substring(0, domain.indexOf("."));
    }
}