package com.yc.videocache;

import android.content.Context;
import android.os.Environment;

import java.io.File;

import static android.os.Environment.MEDIA_MOUNTED;

/**
 * Provides application storage paths
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.0.0
 */
public final class StorageUtils {

    private static final String INDIVIDUAL_DIR_NAME = "video-cache";

    /**
     * Returns individual application cache directory (for only video caching from Proxy). Cache directory will be
     * created on SD card <i>("/Android/data/[app_package_name]/cache/video-cache")</i> if card is mounted .
     * Else - Android defines cache directory on device's file system.
     *
     * @param context Application context
     * @return Cache {@link File directory}
     */
    static File getIndividualCacheDirectory(Context context) {
        File cacheDir = getCacheDirectory(context);
        return new File(cacheDir, INDIVIDUAL_DIR_NAME);
    }

    /**
     * Returns application cache directory. Cache directory will be created on SD card
     * <i>("/Android/data/[app_package_name]/cache")</i> (if card is mounted and app has appropriate permission) or
     * on device's file system depending incoming parameters.
     *
     * @param context        Application context
     * @return Cache {@link File directory}.<br />
     * <b>NOTE:</b> Can be null in some unpredictable cases (if SD card is unmounted and
     * {@link Context#getCacheDir() Context.getCacheDir()} returns null).
     */
    private static File getCacheDirectory(Context context) {
        File appCacheDir = null;
        if (MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
            appCacheDir = context.getExternalCacheDir();
        }
        if (appCacheDir == null) {
            appCacheDir = context.getCacheDir();
        }
        if (appCacheDir == null) {
            String cacheDirPath = "/data/data/" + context.getPackageName() + "/cache/";
            appCacheDir = new File(cacheDirPath);
        }
        return appCacheDir;
    }

    /**
     * 删除文件
     * @param root                              file
     * @return                                  是否删除成功
     */
    public static boolean deleteFiles(File root) {
        File[] files = root.listFiles();
        if (files != null) {
            for (File f : files) {
                if (!f.isDirectory() && f.exists()) { // 判断是否存在
                    if (!f.delete()) {
                        return false;
                    }
                }
            }
        }
        return true;
    }


    /**
     * 删除文件
     * @param filePath                          file路径
     * @return                                  是否删除成功
     */
    public static boolean deleteFile(String filePath) {
        File file = new File(filePath);
        if (file.exists()) {
            if (file.isFile()) {
                return file.delete();
            } else {
                String[] filePaths = file.list();

                if (filePaths != null) {
                    for (String path : filePaths) {
                        deleteFile(filePath + File.separator + path);
                    }
                }
                return file.delete();
            }
        }
        return true;
    }
}