/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.quicksearchbox;

import android.app.SearchManager;
import android.content.ComponentName;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Intent;
import android.content.UriMatcher;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Binder;
import android.text.TextUtils;
import android.util.Log;

/**
 * Handles broadcast intents for adding shortcuts to QSB.
 */
public class ShortcutsProvider extends ContentProvider {

    private static final boolean DBG = false;
    private static final String TAG = "QSB.ExternalShortcutReceiver";

    public static final String EXTRA_SHORTCUT_SOURCE = "shortcut_source";

    private static final int URI_CODE_SHORTCUTS = 0;

    private UriMatcher mUriMatcher;

    @Override
    public boolean onCreate() {
        mUriMatcher = buildUriMatcher();
        return true;
    }

    private UriMatcher buildUriMatcher() {
        String authority = getAuthority();
        UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
        matcher.addURI(authority, "shortcuts", URI_CODE_SHORTCUTS);
        return matcher;
    }

    private String getAuthority() {
        return getContext().getPackageName() + ".shortcuts";
    }

    @Override
    public String getType(Uri uri) {
        switch (mUriMatcher.match(uri)) {
            case URI_CODE_SHORTCUTS:
                return SearchManager.SUGGEST_MIME_TYPE;
            default:
                throw new IllegalArgumentException("Unknown URI: " + uri);
        }
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        switch (mUriMatcher.match(uri)) {
            case URI_CODE_SHORTCUTS:
                addShortcut(values);
                return null;
            default:
                throw new IllegalArgumentException("Unknown URI: " + uri);
        }
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
            String sortOrder) {
        throw new UnsupportedOperationException();
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        throw new UnsupportedOperationException();
    }

    private void addShortcut(final ContentValues shortcut) {
        String sourceName = shortcut.getAsString(EXTRA_SHORTCUT_SOURCE);
        if (TextUtils.isEmpty(sourceName)) {
            Log.e(TAG, "Missing " + EXTRA_SHORTCUT_SOURCE);
            return;
        }

        String sourceAction = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_INTENT_ACTION);
        if (Intent.ACTION_WEB_SEARCH.equals(sourceAction)) {
            if (DBG) {
                Log.d(TAG, "Ignoring shortcut from " + sourceName +
                        "because its intent action was ACTION_WEB_SEARCH.");
            }
            return;
        }

        final ComponentName sourceComponent = ComponentName.unflattenFromString(sourceName);
        if (!checkCallingPackage(sourceComponent.getPackageName())) {
            Log.w(TAG, "Got shortcut for " + sourceComponent + " from a different process");
            return;
        }

        getQsbApplication().runOnUiThread(new Runnable() {
            public void run() {
                storeShortcut(sourceComponent, shortcut);
            }
        });
    }

    // Called on the main thread
    private void storeShortcut(ComponentName sourceComponent, ContentValues shortcut) {
        if (DBG) Log.d(TAG, "Adding (PID: " + Binder.getCallingPid() + "): " + shortcut);

        Source source = getCorpora().getSource(sourceComponent.flattenToShortString());
        if (source == null) {
            Log.w(TAG, "Unknown shortcut source " + sourceComponent);
            return;
        }

        String userQuery = shortcut.getAsString(SearchManager.USER_QUERY);
        if (userQuery == null) userQuery = "";

        ListSuggestionCursor cursor = new ListSuggestionCursor(userQuery);
        cursor.add(makeSuggestion(source, shortcut));
        getShortcutRepository().reportClick(cursor, 0);
    }

    private boolean checkCallingPackage(String packageName) {
        int callingUid = Binder.getCallingUid();
        PackageManager pm = getContext().getPackageManager();
        String[] uidPkgs = pm.getPackagesForUid(callingUid);
        if (uidPkgs == null) return false;
        for (String uidPkg : uidPkgs) {
            if (packageName.equals(uidPkg)) return true;
        }
        return false;
    }

    private SuggestionData makeSuggestion(Source source, ContentValues shortcut) {
        String format = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_FORMAT);
        String text1 = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_TEXT_1);
        String text2 = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_TEXT_2);
        String text2Url = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_TEXT_2_URL);
        String icon1 = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_ICON_1);
        String icon2 = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_ICON_2);
        String shortcutId = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_SHORTCUT_ID);
        boolean spinnerWhileRefreshing = unboxBoolean(
                shortcut.getAsBoolean(SearchManager.SUGGEST_COLUMN_SPINNER_WHILE_REFRESHING),
                false);
        String intentAction = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_INTENT_ACTION);
        String intentData = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_INTENT_DATA);
        String intentExtraData =
                shortcut.getAsString(SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA);
        String query = shortcut.getAsString(SearchManager.SUGGEST_COLUMN_QUERY);

        SuggestionData suggestion = new SuggestionData(source);
        suggestion.setFormat(format);
        suggestion.setText1(text1);
        suggestion.setText2(text2);
        suggestion.setText2Url(text2Url);
        suggestion.setIcon1(icon1);
        suggestion.setIcon2(icon2);
        suggestion.setShortcutId(shortcutId);
        suggestion.setSpinnerWhileRefreshing(spinnerWhileRefreshing);
        suggestion.setIntentAction(intentAction);
        suggestion.setIntentData(intentData);
        suggestion.setIntentExtraData(intentExtraData);
        suggestion.setSuggestionQuery(query);
        return suggestion;
    }

    private static boolean unboxBoolean(Boolean value, boolean defValue) {
        return value == null ? defValue : value;
    }

    private QsbApplication getQsbApplication() {
        return QsbApplication.get(getContext());
    }

    private ShortcutRepository getShortcutRepository() {
        return getQsbApplication().getShortcutRepository();
    }

    private Corpora getCorpora() {
        return getQsbApplication().getCorpora();
    }

}