/*
 * Copyright (C) 2009-2015 Typesafe Inc. <http://www.typesafe.com>
 */
package play;

import play.libs.Scala;

import javax.inject.Inject;
import javax.inject.Singleton;
import java.io.File;
import java.io.InputStream;
import java.net.URL;

/**
 * The environment for the application.
 *
 * Captures concerns relating to the classloader and the filesystem for the application.
 */
@Singleton
public class Environment {
    private final play.api.Environment env;

    @Inject
    public Environment(play.api.Environment environment) {
        this.env = environment;
    }

    public Environment(File rootPath, ClassLoader classLoader, Mode mode) {
        this(new play.api.Environment(rootPath, classLoader, play.api.Mode.apply(mode.ordinal())));
    }

    public Environment(File rootPath, Mode mode) {
        this(rootPath, Environment.class.getClassLoader(), mode);
    }

    public Environment(File rootPath) {
        this(rootPath, Environment.class.getClassLoader(), Mode.TEST);
    }

    public Environment(Mode mode) {
        this(new File("."), Environment.class.getClassLoader(), mode);
    }

    /**
     * The root path that the application is deployed at.
     */
    public File rootPath() {
        return env.rootPath();
    }

    /**
     * The classloader that all application classes and resources can be loaded from.
     */
    public ClassLoader classLoader() {
        return env.classLoader();
    }

    /**
     * The mode of the application.
     */
    public Mode mode() {
        if (env.mode().equals(play.api.Mode.Prod())) {
            return Mode.PROD;
        } else if (env.mode().equals(play.api.Mode.Dev())) {
            return Mode.DEV;
        } else {
            return Mode.TEST;
        }
    }

    /**
     * Returns `true` if the application is `DEV` mode.
     */
    public boolean isDev() {
        return mode().equals(Mode.DEV);
    }

    /**
     * Returns `true` if the application is `PROD` mode.
     */
    public boolean isProd() {
        return mode().equals(Mode.PROD);
    }

    /**
     * Returns `true` if the application is `TEST` mode.
     */
    public boolean isTest() {
        return mode().equals(Mode.TEST);
    }

    /**
     * Retrieves a file relative to the application root path.
     *
     * @param relativePath relative path of the file to fetch
     * @return a file instance - it is not guaranteed that the file exists
     */
    public File getFile(String relativePath) {
        return env.getFile(relativePath);
    }

    /**
     * Retrieves a resource from the classpath.
     *
     * @param relativePath relative path of the resource to fetch
     * @return URL to the resource (may be null)
     */
    public URL resource(String relativePath) {
        return Scala.orNull(env.resource(relativePath));
    }

    /**
     * Retrieves a resource stream from the classpath.
     *
     * @param relativePath relative path of the resource to fetch
     * @return InputStream to the resource (may be null)
     */
    public InputStream resourceAsStream(String relativePath) {
        return Scala.orNull(env.resourceAsStream(relativePath));
    }

    /**
     * A simple environment.
     *
     * Uses the same classloader that the environment classloader is defined in,
     * the current working directory as the path and test mode.
     */
    public static Environment simple() {
        return new Environment(new File("."), Environment.class.getClassLoader(), Mode.TEST);
    }

    /**
     * The underlying Scala API Environment object that this Environment
     * wraps.
     */
    public play.api.Environment underlying() {
        return env;
    }
}