package de.thedevstack.conversationsplus.utils;

import android.graphics.BitmapFactory;

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

import de.thedevstack.conversationsplus.ConversationsPlusApplication;
import de.thedevstack.conversationsplus.entities.DownloadableFile;
import de.thedevstack.conversationsplus.entities.Message;
import de.thedevstack.conversationsplus.persistance.DatabaseBackend;
import de.thedevstack.conversationsplus.persistance.FileBackend;

/**
 * Utility class to work with messages.
 */
public final class MessageUtil {

    public static void markMessage(Message message, int status) {
        if (status == Message.STATUS_SEND_FAILED
                && (message.getStatus() == Message.STATUS_SEND_RECEIVED || message
                .getStatus() == Message.STATUS_SEND_DISPLAYED)) {
            return;
        }
        message.setStatus(status);
        DatabaseBackend.getInstance(ConversationsPlusApplication.getAppContext()).updateMessage(message);
        UiUpdateHelper.updateConversationUi();
    }

    public static boolean wasHighlightedOrPrivate(final Message message) {
        final String nick = message.getConversation().getMucOptions().getActualNick();
        final Pattern highlight = generateNickHighlightPattern(nick);
        if (message.getBody() == null || nick == null) {
            return false;
        }
        final Matcher m = highlight.matcher(message.getBody());
        return (m.find() || message.getType() == Message.TYPE_PRIVATE);
    }

    private static Pattern generateNickHighlightPattern(final String nick) {
        // We expect a word boundary, i.e. space or start of string, followed by
        // the
        // nick (matched in case-insensitive manner), followed by optional
        // punctuation (for example "bob: i disagree" or "how are you alice?"),
        // followed by another word boundary.
        return Pattern.compile("\\b" + Pattern.quote(nick) + "\\p{Punct}?\\b",
                Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
    }

    public static void updateMessageWithImageDetails(Message message, String filePath, long size, int imageWidth, int imageHeight) {
        message.setRelativeFilePath(filePath);
        MessageUtil.updateMessageBodyWithImageParams(message, size, imageWidth, imageHeight);
    }

    public static void updateFileParams(Message message) {
        updateFileParams(message, null);
    }

    public static void updateFileParams(Message message, URL url) {
        DownloadableFile file = FileBackend.getFile(message);
        int imageWidth = -1;
        int imageHeight = -1;
        if (message.getType() == Message.TYPE_IMAGE || file.getMimeType().startsWith("image/")) {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(file.getAbsolutePath(), options);
            imageHeight = options.outHeight;
            imageWidth = options.outWidth;
        }

        MessageUtil.updateMessageBodyWithFileParams(message, url, file.getSize(), imageWidth, imageHeight);
    }

    private static void updateMessageBodyWithFileParams(Message message, URL url, long fileSize, int imageWidth, int imageHeight) {
        message.setBody(MessageUtil.getMessageBodyWithImageParams(url, fileSize, imageWidth, imageHeight));
    }

    private static void updateMessageBodyWithImageParams(Message message, long size, int imageWidth, int imageHeight) {
        MessageUtil.updateMessageBodyWithImageParams(message, null, size, imageWidth, imageHeight);
    }

    private static void updateMessageBodyWithImageParams(Message message, URL url, long size, int imageWidth, int imageHeight) {
        message.setBody(MessageUtil.getMessageBodyWithImageParams(url, size, imageWidth, imageHeight));
    }

    private static String getMessageBodyWithImageParams(URL url, long size, int imageWidth, int imageHeight) {
        StringBuilder sb = new StringBuilder();
        if (null != url) {
            sb.append(url.toString());
            sb.append('|');
        }
        sb.append(size);
        if (-1 < imageWidth) {
            sb.append('|');
            sb.append(imageWidth);
        }
        if (-1 < imageHeight) {
            sb.append('|');
            sb.append(imageHeight);
        }
        return sb.toString();
    }

    private MessageUtil() {
        // Static helper class
    }
}