/*
 * Copyright (C) 2018 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.vts.config;

import com.android.vts.entity.ApiCoverageEntity;
import com.android.vts.entity.BranchEntity;
import com.android.vts.entity.BuildTargetEntity;
import com.android.vts.entity.ApiCoverageExcludedEntity;
import com.android.vts.entity.CodeCoverageEntity;
import com.android.vts.entity.CoverageEntity;
import com.android.vts.entity.DeviceInfoEntity;
import com.android.vts.entity.HalApiEntity;
import com.android.vts.entity.ProfilingPointEntity;
import com.android.vts.entity.ProfilingPointRunEntity;
import com.android.vts.entity.ProfilingPointSummaryEntity;
import com.android.vts.entity.RoleEntity;
import com.android.vts.entity.TestAcknowledgmentEntity;
import com.android.vts.entity.TestCaseRunEntity;
import com.android.vts.entity.TestCoverageStatusEntity;
import com.android.vts.entity.TestEntity;
import com.android.vts.entity.TestPlanEntity;
import com.android.vts.entity.TestPlanRunEntity;
import com.android.vts.entity.TestRunEntity;
import com.android.vts.entity.TestStatusEntity;
import com.android.vts.entity.TestSuiteFileEntity;
import com.android.vts.entity.TestSuiteResultEntity;
import com.android.vts.entity.UserEntity;
import com.google.api.client.extensions.appengine.datastore.AppEngineDataStoreFactory;
import com.google.api.services.sheets.v4.SheetsScopes;
import com.googlecode.objectify.ObjectifyService;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.stream.Stream;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

/** The @WebListener annotation for registering a class as a listener of a web application. */
@WebListener
/**
 * Initializing Objectify Service at the container start up before any web components like servlet
 * get initialized.
 */
public class ObjectifyListener implements ServletContextListener {

    private static final Logger logger = Logger.getLogger(ObjectifyListener.class.getName());


    /** Global instance of the DataStoreFactory. */
    private static final AppEngineDataStoreFactory DATA_STORE_FACTORY =
            AppEngineDataStoreFactory.getDefaultInstance();

    /** Global instance of the scopes. */
    private static final List<String> GOOGLE_API_SCOPES =
            Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY);

    /**
     * Receives notification that the web application initialization process is starting. This
     * function will register Entity classes for objectify.
     */
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        ObjectifyService.init();
        ObjectifyService.register(BranchEntity.class);
        ObjectifyService.register(BuildTargetEntity.class);

        ObjectifyService.register(HalApiEntity.class);
        ObjectifyService.register(ApiCoverageEntity.class);
        ObjectifyService.register(ApiCoverageExcludedEntity.class);
        ObjectifyService.register(CodeCoverageEntity.class);
        ObjectifyService.register(CoverageEntity.class);
        ObjectifyService.register(DeviceInfoEntity.class);
        ObjectifyService.register(TestCoverageStatusEntity.class);

        ObjectifyService.register(ProfilingPointEntity.class);
        ObjectifyService.register(ProfilingPointRunEntity.class);
        ObjectifyService.register(ProfilingPointSummaryEntity.class);

        ObjectifyService.register(TestEntity.class);
        ObjectifyService.register(TestPlanEntity.class);
        ObjectifyService.register(TestPlanRunEntity.class);
        ObjectifyService.register(TestRunEntity.class);
        ObjectifyService.register(TestCaseRunEntity.class);
        ObjectifyService.register(TestStatusEntity.class);
        ObjectifyService.register(TestSuiteFileEntity.class);
        ObjectifyService.register(TestSuiteResultEntity.class);
        ObjectifyService.register(TestAcknowledgmentEntity.class);
        ObjectifyService.register(RoleEntity.class);
        ObjectifyService.register(UserEntity.class);
        ObjectifyService.begin();
        logger.log(Level.INFO, "Value Initialized from context.");

        Properties systemConfigProp = new Properties();

        try {
            InputStream defaultInputStream =
                    ObjectifyListener.class
                            .getClassLoader()
                            .getResourceAsStream("config.properties");

            systemConfigProp.load(defaultInputStream);

            servletContextEvent
                    .getServletContext()
                    .setAttribute("systemConfigProp", systemConfigProp);
            servletContextEvent
                    .getServletContext()
                    .setAttribute("dataStoreFactory", DATA_STORE_FACTORY);
            servletContextEvent
                    .getServletContext()
                    .setAttribute("googleApiScopes", GOOGLE_API_SCOPES);

            String roleList = systemConfigProp.getProperty("user.roleList");
            Supplier<Stream<String>> streamSupplier = () -> Arrays.stream(roleList.split(","));
            this.createRoles(streamSupplier.get());

            String adminEmail = systemConfigProp.getProperty("user.adminEmail");
            if (adminEmail.isEmpty()) {
                logger.log(Level.WARNING, "Admin email is not properly set. Check config file");
            } else {
                String adminName = systemConfigProp.getProperty("user.adminName");
                String adminCompany = systemConfigProp.getProperty("user.adminCompany");
                Optional<String> roleName =
                        streamSupplier.get().filter(r -> r.equals("admin")).findFirst();
                this.createAdminUser(adminEmail, adminName, adminCompany, roleName.orElse("admin"));
            }
        } catch (FileNotFoundException e) {
            logger.log(Level.SEVERE, e.getMessage());
        } catch (IOException e) {
            logger.log(Level.SEVERE, e.getMessage());
        }
    }

    /** Receives notification that the ServletContext is about to be shut down. */
    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        ServletContext servletContext = servletContextEvent.getServletContext();
        logger.log(Level.INFO, "Value deleted from context.");
    }

    private void createRoles(Stream<String> roleStream) {
        roleStream
                .map(role -> role.trim())
                .forEach(
                        roleName -> {
                            RoleEntity roleEntity = new RoleEntity(roleName);
                            roleEntity.save();
                        });
    }

    private void createAdminUser(String email, String name, String company, String role) {
        Optional<UserEntity> adminUserEntityOptional =
                Optional.ofNullable(UserEntity.getAdminUser(email));
        if (adminUserEntityOptional.isPresent()) {
            logger.log(Level.INFO, "The user is already registered.");
        } else {
            UserEntity userEntity = new UserEntity(email, name, company, role);
            userEntity.setIsAdmin(true);
            userEntity.save();
            logger.log(Level.INFO, "The user is saved successfully.");
        }
    }
}