/*
 * 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.server.healthconnect.storage;

import android.annotation.Nullable;
import android.content.Context;
import android.content.ContextWrapper;
import android.database.sqlite.SQLiteDatabase;
import android.os.UserHandle;
import android.util.Slog;

import com.android.server.healthconnect.utils.FilesUtil;

import java.io.File;

/**
 * {@link ContextWrapper} for HealthConnect.
 *
 * <p>Within HealthConnect codebase, we should not pass an object of this class to any method that
 * accepts the base context class.
 *
 * <p>The wrapper wraps around a context for the current active user. Most classes are initially
 * initialised with the primary user on the device, and then get a new context when the user switch
 * happens.
 *
 * <p>The wrapper provides the storage directory, per user, where all HealthConnect data should be
 * stored. This is also used to initialize {@link HealthConnectDatabase} to ensure database is
 * created in the same directory. Use cases that require creating an additional database (e.g. D2D,
 * export/import) can pass in a sub-directory to create the database in that directory.
 *
 * @hide
 */
public final class HealthConnectContext extends ContextWrapper {

    private static final String TAG = "HealthConnectDatabaseContext";

    private final File mDatabaseDir;

    private HealthConnectContext(
            Context context,
            UserHandle userHandle,
            @Nullable String databaseDirName,
            File environmentDataDirectory) {
        super(context.createContextAsUser(userHandle, 0));

        if (databaseDirName == null) {
            mDatabaseDir =
                    FilesUtil.getDataSystemCeHCDirectoryForUser(
                            environmentDataDirectory, userHandle.getIdentifier());
        } else {
            File hcDirectory =
                    FilesUtil.getDataSystemCeHCDirectoryForUser(
                            environmentDataDirectory, userHandle.getIdentifier());
            mDatabaseDir = new File(hcDirectory, databaseDirName);
        }
    }

    /**
     * Returns the data directory where files are stored.
     *
     * <p>HealthConnect stores files in the directory returned by this method, and doesn't use the
     * files and cache sub-directories.
     */
    @Override
    public File getDataDir() {
        mDatabaseDir.mkdirs();
        return mDatabaseDir;
    }

    @Override
    public boolean deleteDatabase(String name) {
        try {
            File f = getDatabasePath(name);
            return SQLiteDatabase.deleteDatabase(f);
        } catch (Exception e) {
            Slog.e(TAG, "Failed to delete database = " + getDatabasePath(name));
        }
        return false;
    }

    /** Returns the file of the staged database with the given name */
    @Override
    public File getDatabasePath(String name) {
        return new File(getDataDir(), name);
    }

    /** Factory method */
    public static HealthConnectContext create(
            Context context,
            UserHandle userHandle,
            @Nullable String databaseDirName,
            File environmentDataDirectory) {
        return new HealthConnectContext(
                context, userHandle, databaseDirName, environmentDataDirectory);
    }
}