App.java

package hexlet.code;

import hexlet.code.repository.BaseRepository;
import hexlet.code.controller.UrlController;
import hexlet.code.util.NamedRoutes;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.stream.Collectors;

import gg.jte.ContentType;
import gg.jte.TemplateEngine;
import gg.jte.resolve.ResourceCodeResolver;

import io.javalin.Javalin;
import io.javalin.rendering.template.JavalinJte;

import lombok.extern.slf4j.Slf4j;

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

@Slf4j
public class App {
    private static TemplateEngine createTemplateEngine() {
        ClassLoader classLoader = App.class.getClassLoader();
        ResourceCodeResolver codeResolver = new ResourceCodeResolver("templates", classLoader);
        return TemplateEngine.create(codeResolver, ContentType.Html);
    }

    private static String getDatabaseUrl() {
        // Получаю url базы данных из переменной окружения DATABASE_URL
        // Если она не установлена, используем базу в памяти
        return System.getenv().getOrDefault("JDBC_DATABASE_URL", "jdbc:h2:mem:project;DB_CLOSE_DELAY=-1;");
    }

    private static String readResourceFile(String fileName) throws IOException {
        InputStream inputStream = App.class.getClassLoader().getResourceAsStream(fileName);
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
            return reader.lines().collect(Collectors.joining("\n"));
        }
    }

    public static Javalin getApp() throws IOException, SQLException { //
        HikariConfig hikariConfig = new HikariConfig();
        hikariConfig.setJdbcUrl(getDatabaseUrl());

        HikariDataSource dataSource = new HikariDataSource(hikariConfig);
        String sql = readResourceFile("schema.sql");

        log.info(sql);
        try (Connection connection = dataSource.getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(sql);
        }
        BaseRepository.dataSource = dataSource;

        Javalin app = Javalin.create(config -> {
            config.bundledPlugins.enableDevLogging();
            config.fileRenderer(new JavalinJte(createTemplateEngine()));
        });

        // root path
        app.get(NamedRoutes.mainPage(), ctx -> ctx.render("index.jte"));
        // other
        app.post(NamedRoutes.urlsPath(), UrlController::create);
        app.get(NamedRoutes.buildPath(), UrlController::build);
        app.get(NamedRoutes.urlsPath(), UrlController::index);
        app.get(NamedRoutes.urlPath("{id}"), UrlController::show);

        return app;
    }

    public static void main(String[] args) throws IOException, SQLException { //throws SQLException
        Javalin app = getApp();
        app.start(7070);
    }
}