/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * 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.badlogic.gdx;

import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.utils.GdxRuntimeException;

/** Provides standard access to the filesystem, classpath, Android app storage (internal and external), and Android assets
 * directory.
 * @author mzechner
 * @author Nathan Sweet */
public interface Files {
	/** Indicates how to resolve a path to a file.
	 * @author mzechner
	 * @author Nathan Sweet */
	public enum FileType {
		/** Path relative to the root of the classpath. Classpath files are always readonly. Note that classpath files are not
		 * compatible with some functionality on Android, such as {@link Audio#newSound(FileHandle)} and
		 * {@link Audio#newMusic(FileHandle)}. */
		Classpath,

		/** Path relative to the asset directory on Android and to the application's root directory on the desktop. On the desktop,
		 * if the file is not found, then the classpath is checked. This enables files to be found when using JWS or applets.
		 * Internal files are always readonly. */
		Internal,

		/** Path relative to the root of the app external storage on Android and to the home directory of the current user on the
		 * desktop. */
		External,

		/** Path that is a fully qualified, absolute filesystem path. To ensure portability across platforms use absolute files only
		 * when absolutely (heh) necessary. */
		Absolute,

		/** Path relative to the private files directory on Android and to the application's root directory on the desktop. */
		Local;
	}

	/** Returns a handle representing a file or directory.
	 * @param type Determines how the path is resolved.
	 * @throws GdxRuntimeException if the type is classpath or internal and the file does not exist.
	 * @see FileType */
	public FileHandle getFileHandle (String path, FileType type);

	/** Convenience method that returns a {@link FileType#Classpath} file handle. */
	public FileHandle classpath (String path);

	/** Convenience method that returns a {@link FileType#Internal} file handle. */
	public FileHandle internal (String path);

	/** Convenience method that returns a {@link FileType#External} file handle. */
	public FileHandle external (String path);

	/** Convenience method that returns a {@link FileType#Absolute} file handle. */
	public FileHandle absolute (String path);

	/** Convenience method that returns a {@link FileType#Local} file handle. */
	public FileHandle local (String path);

	/** Returns the external storage path directory. This is the app external storage on Android and the home directory of the
	 * current user on the desktop. */
	public String getExternalStoragePath ();

	/** Returns true if the external storage is ready for file IO. */
	public boolean isExternalStorageAvailable ();

	/** Returns the local storage path directory. This is the private files directory on Android and the directory of the jar on
	 * the desktop. */
	public String getLocalStoragePath ();

	/** Returns true if the local storage is ready for file IO. */
	public boolean isLocalStorageAvailable ();
}
