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package de.danoeh.antennapod.feed;
import java.util.ArrayList;
import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.content.Context;
import android.database.Cursor;
import android.os.Looper;
import android.util.Log;
import de.danoeh.antennapod.AppConfig;
import de.danoeh.antennapod.PodcastApp;
import de.danoeh.antennapod.R;
import de.danoeh.antennapod.storage.PodDBAdapter;
import de.danoeh.antennapod.util.comparator.SearchResultValueComparator;
/** Performs search on Feeds and FeedItems */
public class FeedSearcher {
private static final String TAG = "FeedSearcher";
// Search result values
private static final int VALUE_FEED_TITLE = 3;
private static final int VALUE_ITEM_TITLE = 2;
private static final int VALUE_ITEM_CHAPTER = 1;
private static final int VALUE_ITEM_DESCRIPTION = 0;
private static final int VALUE_WORD_MATCH = 4;
/** Performs a search in all feeds or one specific feed. */
public static ArrayList<SearchResult> performSearch(final Context context,
final String query, final Feed selectedFeed) {
final String lcQuery = query.toLowerCase();
final ArrayList<SearchResult> result = new ArrayList<SearchResult>();
if (selectedFeed == null) {
if (AppConfig.DEBUG)
Log.d(TAG, "Performing global search");
if (AppConfig.DEBUG)
Log.d(TAG, "Searching Feed titles");
searchFeedtitles(lcQuery, result);
} else if (AppConfig.DEBUG) {
Log.d(TAG, "Performing search on specific feed");
}
if (AppConfig.DEBUG)
Log.d(TAG, "Searching Feeditem titles");
searchFeedItemTitles(lcQuery, result, selectedFeed);
if (AppConfig.DEBUG)
Log.d(TAG, "Searching item-chaptertitles");
searchFeedItemChapters(lcQuery, result, selectedFeed);
final FeedManager manager = FeedManager.getInstance();
Looper.prepare();
manager.searchFeedItemDescription(context, selectedFeed, lcQuery,
new FeedManager.QueryTaskCallback() {
@Override
public void handleResult(Cursor cResult) {
searchFeedItemContentEncodedCursor(lcQuery, result,
selectedFeed, cResult);
}
@Override
public void onCompletion() {
manager.searchFeedItemContentEncoded(context,
selectedFeed, lcQuery,
new FeedManager.QueryTaskCallback() {
@Override
public void handleResult(Cursor cResult) {
searchFeedItemDescriptionCursor(
lcQuery, result, selectedFeed,
cResult);
}
@Override
public void onCompletion() {
Looper.myLooper().quit();
}
});
}
});
Looper.loop();
if (AppConfig.DEBUG)
Log.d(TAG, "Sorting results");
Collections.sort(result, new SearchResultValueComparator());
return result;
}
private static void searchFeedtitles(String query,
ArrayList<SearchResult> destination) {
FeedManager manager = FeedManager.getInstance();
for (Feed feed : manager.getFeeds()) {
SearchResult result = createSearchResult(feed, query, feed
.getTitle().toLowerCase(), VALUE_FEED_TITLE);
if (result != null) {
destination.add(result);
}
}
}
private static void searchFeedItemTitles(String query,
ArrayList<SearchResult> destination, Feed selectedFeed) {
FeedManager manager = FeedManager.getInstance();
if (selectedFeed == null) {
for (Feed feed : manager.getFeeds()) {
searchFeedItemTitlesSingleFeed(query, destination, feed);
}
} else {
searchFeedItemTitlesSingleFeed(query, destination, selectedFeed);
}
}
private static void searchFeedItemTitlesSingleFeed(String query,
ArrayList<SearchResult> destination, Feed feed) {
for (FeedItem item : feed.getItems()) {
SearchResult result = createSearchResult(item, query, item
.getTitle().toLowerCase(), VALUE_ITEM_TITLE);
if (result != null) {
result.setSubtitle(PodcastApp.getInstance().getString(
R.string.found_in_title_label));
destination.add(result);
}
}
}
private static void searchFeedItemChapters(String query,
ArrayList<SearchResult> destination, Feed selectedFeed) {
FeedManager manager = FeedManager.getInstance();
if (selectedFeed == null) {
for (Feed feed : manager.getFeeds()) {
searchFeedItemChaptersSingleFeed(query, destination, feed);
}
} else {
searchFeedItemChaptersSingleFeed(query, destination, selectedFeed);
}
}
private static void searchFeedItemChaptersSingleFeed(String query,
ArrayList<SearchResult> destination, Feed feed) {
for (FeedItem item : feed.getItems()) {
if (item.getChapters() != null) {
for (Chapter sc : item.getChapters()) {
SearchResult result = createSearchResult(item, query, sc
.getTitle().toLowerCase(), VALUE_ITEM_CHAPTER);
if (result != null) {
result.setSubtitle(PodcastApp.getInstance().getString(
R.string.found_in_chapters_label));
destination.add(result);
}
}
}
}
}
private static void searchFeedItemDescriptionCursor(String query,
ArrayList<SearchResult> destination, Feed feed, Cursor cursor) {
FeedManager manager = FeedManager.getInstance();
if (cursor.moveToFirst()) {
do {
final long itemId = cursor
.getLong(PodDBAdapter.IDX_FI_EXTRA_ID);
String content = cursor
.getString(PodDBAdapter.IDX_FI_EXTRA_DESCRIPTION);
if (content != null) {
content = content.toLowerCase();
final long feedId = cursor
.getLong(PodDBAdapter.IDX_FI_EXTRA_FEED);
FeedItem item = null;
if (feed == null) {
item = manager.getFeedItem(itemId, feedId);
} else {
item = manager.getFeedItem(itemId, feed);
}
if (item != null) {
SearchResult searchResult = createSearchResult(item,
query, content, VALUE_ITEM_DESCRIPTION);
if (searchResult != null) {
searchResult.setSubtitle(PodcastApp.getInstance()
.getString(
R.string.found_in_shownotes_label));
destination.add(searchResult);
}
}
}
} while (cursor.moveToNext());
}
}
private static void searchFeedItemContentEncodedCursor(String query,
ArrayList<SearchResult> destination, Feed feed, Cursor cursor) {
FeedManager manager = FeedManager.getInstance();
if (cursor.moveToFirst()) {
do {
final long itemId = cursor
.getLong(PodDBAdapter.IDX_FI_EXTRA_ID);
String content = cursor
.getString(PodDBAdapter.IDX_FI_EXTRA_CONTENT_ENCODED);
if (content != null) {
content = content.toLowerCase();
final long feedId = cursor
.getLong(PodDBAdapter.IDX_FI_EXTRA_FEED);
FeedItem item = null;
if (feed == null) {
item = manager.getFeedItem(itemId, feedId);
} else {
item = manager.getFeedItem(itemId, feed);
}
if (item != null) {
SearchResult searchResult = createSearchResult(item,
query, content, VALUE_ITEM_DESCRIPTION);
if (searchResult != null) {
searchResult.setSubtitle(PodcastApp.getInstance()
.getString(
R.string.found_in_shownotes_label));
destination.add(searchResult);
}
}
}
} while (cursor.moveToNext());
}
}
private static SearchResult createSearchResult(FeedComponent component,
String query, String text, int baseValue) {
int bonus = 0;
boolean found = false;
// try word search
Pattern word = Pattern.compile("\b" + query + "\b");
Matcher matcher = word.matcher(text);
found = matcher.find();
if (found) {
bonus = VALUE_WORD_MATCH;
} else {
// search for other occurence
found = text.contains(query);
}
if (found) {
return new SearchResult(component, baseValue + bonus);
} else {
return null;
}
}
}
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