/*
 * Copyright (C) 2019 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.launcher3.provider;

import static android.os.Process.myUserHandle;

import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;

import static com.android.launcher3.LauncherSettings.Favorites.CONTAINER_DESKTOP;
import static com.android.launcher3.LauncherSettings.Favorites.ITEM_TYPE_APPLICATION;
import static com.android.launcher3.LauncherSettings.Favorites.TABLE_NAME;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.spy;

import android.app.backup.BackupManager;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.UserHandle;
import android.os.UserManager;
import android.util.LongSparseArray;

import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.filters.SmallTest;

import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherSettings;
import com.android.launcher3.LauncherSettings.Favorites;
import com.android.launcher3.model.DatabaseHelper;

import org.junit.Test;
import org.junit.runner.RunWith;

/**
 * Tests for {@link RestoreDbTask}
 */
@SmallTest
@RunWith(AndroidJUnit4.class)
public class RestoreDbTaskTest {

    private static final int PER_USER_RANGE = 200000;

    private final UserHandle mWorkUser = UserHandle.getUserHandleForUid(PER_USER_RANGE);

    @Test
    public void testGetProfileId() throws Exception {
        SQLiteDatabase db = new MyDatabaseHelper(23).getWritableDatabase();
        assertEquals(23, new RestoreDbTask().getDefaultProfileId(db));
    }

    @Test
    public void testMigrateProfileId() throws Exception {
        SQLiteDatabase db = new MyDatabaseHelper(42).getWritableDatabase();
        // Add some mock data
        for (int i = 0; i < 5; i++) {
            ContentValues values = new ContentValues();
            values.put(Favorites._ID, i);
            values.put(Favorites.TITLE, "item " + i);
            db.insert(Favorites.TABLE_NAME, null, values);
        }
        // Verify item add
        assertEquals(5, getCount(db, "select * from favorites where profileId = 42"));

        new RestoreDbTask().migrateProfileId(db, 42, 33);

        // verify data migrated
        assertEquals(0, getCount(db, "select * from favorites where profileId = 42"));
        assertEquals(5, getCount(db, "select * from favorites where profileId = 33"));
    }

    @Test
    public void testChangeDefaultColumn() throws Exception {
        SQLiteDatabase db = new MyDatabaseHelper(42).getWritableDatabase();
        // Add some mock data
        for (int i = 0; i < 5; i++) {
            ContentValues values = new ContentValues();
            values.put(Favorites._ID, i);
            values.put(Favorites.TITLE, "item " + i);
            db.insert(Favorites.TABLE_NAME, null, values);
        }
        // Verify default column is 42
        assertEquals(5, getCount(db, "select * from favorites where profileId = 42"));

        new RestoreDbTask().changeDefaultColumn(db, 33);

        // Verify default value changed
        ContentValues values = new ContentValues();
        values.put(Favorites._ID, 100);
        values.put(Favorites.TITLE, "item 100");
        db.insert(Favorites.TABLE_NAME, null, values);
        assertEquals(1, getCount(db, "select * from favorites where profileId = 33"));
    }

    @Test
    public void testSanitizeDB_bothProfiles() throws Exception {
        Context context = getInstrumentation().getTargetContext();
        UserHandle myUser = myUserHandle();
        long myProfileId = context.getSystemService(UserManager.class)
                .getSerialNumberForUser(myUser);
        long myProfileId_old = myProfileId + 1;
        long workProfileId = myProfileId + 2;
        long workProfileId_old = myProfileId + 3;

        MyDatabaseHelper helper = new MyDatabaseHelper(myProfileId);
        SQLiteDatabase db = helper.getWritableDatabase();
        BackupManager bm = spy(new BackupManager(context));
        doReturn(myUserHandle()).when(bm).getUserForAncestralSerialNumber(eq(myProfileId_old));
        doReturn(mWorkUser).when(bm).getUserForAncestralSerialNumber(eq(workProfileId_old));
        helper.users.put(workProfileId, mWorkUser);

        addIconsBulk(helper, 10, 1, myProfileId_old);
        addIconsBulk(helper, 6, 2, workProfileId_old);
        assertEquals(10, getItemCountForProfile(db, myProfileId_old));
        assertEquals(6, getItemCountForProfile(db, workProfileId_old));

        RestoreDbTask task = new RestoreDbTask();
        task.sanitizeDB(context, helper, helper.getWritableDatabase(), bm);

        // All the data has been migrated to the new user ids
        assertEquals(0, getItemCountForProfile(db, myProfileId_old));
        assertEquals(0, getItemCountForProfile(db, workProfileId_old));
        assertEquals(10, getItemCountForProfile(db, myProfileId));
        assertEquals(6, getItemCountForProfile(db, workProfileId));
    }

    @Test
    public void testSanitizeDB_workItemsRemoved() throws Exception {
        Context context = getInstrumentation().getTargetContext();
        UserHandle myUser = myUserHandle();
        long myProfileId = context.getSystemService(UserManager.class)
                .getSerialNumberForUser(myUser);
        long myProfileId_old = myProfileId + 1;
        long workProfileId_old = myProfileId + 3;

        MyDatabaseHelper helper = new MyDatabaseHelper(myProfileId);
        SQLiteDatabase db = helper.getWritableDatabase();
        BackupManager bm = spy(new BackupManager(context));
        doReturn(myUserHandle()).when(bm).getUserForAncestralSerialNumber(eq(myProfileId_old));
        // Work profile is not migrated
        doReturn(null).when(bm).getUserForAncestralSerialNumber(eq(workProfileId_old));

        addIconsBulk(helper, 10, 1, myProfileId_old);
        addIconsBulk(helper, 6, 2, workProfileId_old);
        assertEquals(10, getItemCountForProfile(db, myProfileId_old));
        assertEquals(6, getItemCountForProfile(db, workProfileId_old));

        RestoreDbTask task = new RestoreDbTask();
        task.sanitizeDB(context, helper, helper.getWritableDatabase(), bm);

        // All the data has been migrated to the new user ids
        assertEquals(0, getItemCountForProfile(db, myProfileId_old));
        assertEquals(0, getItemCountForProfile(db, workProfileId_old));
        assertEquals(10, getItemCountForProfile(db, myProfileId));
        assertEquals(10, getCount(db, "select * from favorites"));
    }

    private void addIconsBulk(DatabaseHelper helper, int count, int screen, long profileId) {
        int columns = LauncherAppState.getIDP(getInstrumentation().getTargetContext()).numColumns;
        String packageName = getInstrumentation().getContext().getPackageName();
        for (int i = 0; i < count; i++) {
            ContentValues values = new ContentValues();
            values.put(LauncherSettings.Favorites._ID, helper.generateNewItemId());
            values.put(LauncherSettings.Favorites.CONTAINER, CONTAINER_DESKTOP);
            values.put(LauncherSettings.Favorites.SCREEN, screen);
            values.put(LauncherSettings.Favorites.CELLX, i % columns);
            values.put(LauncherSettings.Favorites.CELLY, i / columns);
            values.put(LauncherSettings.Favorites.SPANX, 1);
            values.put(LauncherSettings.Favorites.SPANY, 1);
            values.put(LauncherSettings.Favorites.PROFILE_ID, profileId);
            values.put(LauncherSettings.Favorites.ITEM_TYPE, ITEM_TYPE_APPLICATION);
            values.put(LauncherSettings.Favorites.INTENT,
                    new Intent(Intent.ACTION_MAIN).setPackage(packageName).toUri(0));
            helper.getWritableDatabase().insert(TABLE_NAME, null, values);
        }
    }


    @Test
    public void testRemoveScreenIdGaps_firstScreenEmpty() {
        runRemoveScreenIdGapsTest(
                new int[]{1, 2, 5, 6, 6, 7, 9, 9},
                new int[]{1, 2, 3, 4, 4, 5, 6, 6});
    }

    @Test
    public void testRemoveScreenIdGaps_firstScreenOccupied() {
        runRemoveScreenIdGapsTest(
                new int[]{0, 2, 5, 6, 6, 7, 9, 9},
                new int[]{0, 1, 2, 3, 3, 4, 5, 5});
    }

    @Test
    public void testRemoveScreenIdGaps_noGap() {
        runRemoveScreenIdGapsTest(
                new int[]{0, 1, 1, 2, 3, 3, 4, 5},
                new int[]{0, 1, 1, 2, 3, 3, 4, 5});
    }

    private void runRemoveScreenIdGapsTest(int[] screenIds, int[] expectedScreenIds) {
        SQLiteDatabase db = new MyDatabaseHelper(42).getWritableDatabase();
        // Add some mock data
        for (int i = 0; i < screenIds.length; i++) {
            ContentValues values = new ContentValues();
            values.put(Favorites._ID, i);
            values.put(Favorites.SCREEN, screenIds[i]);
            values.put(Favorites.CONTAINER, CONTAINER_DESKTOP);
            db.insert(Favorites.TABLE_NAME, null, values);
        }
        // Verify items are added
        assertEquals(screenIds.length,
                getCount(db, "select * from favorites where container = -100"));

        new RestoreDbTask().removeScreenIdGaps(db);

        // verify screenId gaps removed
        int[] resultScreenIds = new int[screenIds.length];
        try (Cursor c = db.rawQuery(
                "select screen from favorites where container = -100 order by screen", null)) {
            int i = 0;
            while (c.moveToNext()) {
                resultScreenIds[i++] = c.getInt(0);
            }
        }

        assertArrayEquals(expectedScreenIds, resultScreenIds);
    }

    public int getItemCountForProfile(SQLiteDatabase db, long profileId) {
        return getCount(db, "select * from favorites where profileId = " + profileId);
    }

    private int getCount(SQLiteDatabase db, String sql) {
        try (Cursor c = db.rawQuery(sql, null)) {
            return c.getCount();
        }
    }

    private class MyDatabaseHelper extends DatabaseHelper {

        public final LongSparseArray<UserHandle> users;

        MyDatabaseHelper(long profileId) {
            super(getInstrumentation().getTargetContext(), null, false);
            users = new LongSparseArray<>();
            users.put(profileId, myUserHandle());
        }

        @Override
        public long getSerialNumberForUser(UserHandle user) {
            int index = users.indexOfValue(user);
            return index >= 0 ? users.keyAt(index) : -1;
        }

        @Override
        protected void handleOneTimeDataUpgrade(SQLiteDatabase db) { }

        protected void onEmptyDbCreated() { }
    }
}