/*
 * Copyright (C) 2024 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.backuprestore

import android.database.sqlite.SQLiteDatabase
import android.platform.test.flag.junit.SetFlagsRule
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.filters.MediumTest
import com.android.launcher3.LauncherAppState
import com.android.launcher3.LauncherPrefs
import com.android.launcher3.model.ModelDelegate
import com.android.launcher3.provider.RestoreDbTask
import com.android.launcher3.util.Executors.MODEL_EXECUTOR
import com.android.launcher3.util.SandboxApplication
import com.android.launcher3.util.TestUtil
import com.android.launcher3.util.rule.BackAndRestoreRule
import java.io.File
import java.nio.file.Files
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.kotlin.any
import org.mockito.kotlin.doAnswer
import org.mockito.kotlin.mock
import org.mockito.kotlin.spy
import org.mockito.kotlin.whenever

/**
 * Makes sure to test {@code RestoreDbTask#removeOldDBs}, we need to remove all the dbs that are not
 * the last one used when we restore the device.
 */
@RunWith(AndroidJUnit4::class)
@MediumTest
class BackupAndRestoreDBSelectionTest {

    @get:Rule val setFlagsRule = SetFlagsRule()
    @get:Rule
    val context =
        spy(SandboxApplication()).apply {
            val tempDir = Files.createTempDirectory(filesDir.toPath(), "bnr_test").toFile()
            doAnswer { File(tempDir, it.getArgument(0, String::class.java)) }
                .whenever(this)
                .getDatabasePath(any())

            doAnswer {
                    try {
                        SQLiteDatabase.deleteDatabase(
                            getDatabasePath(it.getArgument(0, String::class.java))
                        )
                    } catch (e: Exception) {
                        false
                    }
                }
                .whenever(this)
                .deleteDatabase(any())
        }

    @get:Rule var backAndRestoreRule = BackAndRestoreRule(context)

    val modelDelegate = mock<ModelDelegate>()

    @Test
    fun oldDatabasesNotPresentAfterRestore() {
        val dbController = LauncherAppState.getInstance(context).model.modelDbController
        dbController.attemptMigrateDb(null, modelDelegate)

        TestUtil.runOnExecutorSync(MODEL_EXECUTOR) {
            assert(backAndRestoreRule.getDatabaseFiles().size == 1) {
                "There should only be one database after restoring, the last one used. Actual databases ${backAndRestoreRule.getDatabaseFiles()}"
            }
            assert(!LauncherPrefs.get(context).has(LauncherPrefs.RESTORE_DEVICE)) {
                "RESTORE_DEVICE shouldn't be present after a backup and restore."
            }
        }
    }

    @Test
    fun testExistingDbsAndRemovingDbs() {
        var existingDbs = RestoreDbTask.existingDbs(context)
        assert(existingDbs.size == 4)
        RestoreDbTask.removeOldDBs(context, "launcher_4_by_4.db")
        existingDbs = RestoreDbTask.existingDbs(context)
        assert(existingDbs.size == 1)
    }
}