/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *     * Neither the name of The Linux Foundation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.android.camera;

import android.content.Context;
import android.os.StatFs;
import android.os.Environment;
import android.os.storage.StorageVolume;
import android.os.storage.IMountService;
import android.os.ServiceManager;
import android.util.Log;

public class SDCard {
    private static final String TAG = "SDCard";

    private static final int VOLUME_SDCARD_INDEX = 1;
    private IMountService mMountService = null;
    private StorageVolume mVolume = null;
    private String path = null;
    private String rawpath = null;
    private static SDCard sSDCard;

    public boolean isWriteable() {
        if (mVolume == null) return false;
        final String state = getSDCardStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            return true;
        }
        return false;
    }

    public String getDirectory() {
        if (mVolume == null) {
            return null;
        }
        if (path == null) {
            path = mVolume.getPath() + "/DCIM/Camera";
        }
        return path;
    }

    public String getRawDirectory() {
        if (mVolume == null) {
            return null;
        }
        if (rawpath == null) {
            rawpath = mVolume.getPath() + "/DCIM/Camera/raw";
        }
        return rawpath;
    }

    public static synchronized SDCard instance() {
        if (sSDCard == null) {
            sSDCard = new SDCard();
        }
        return sSDCard;
    }

    private String getSDCardStorageState() {
        try {
            return mMountService.getVolumeState(mVolume.getPath());
        } catch (Exception e) {
            Log.w(TAG, "Failed to read SDCard storage state; assuming REMOVED: " + e);
            return Environment.MEDIA_REMOVED;
        }
    }

    private SDCard() {
        try {
            mMountService = IMountService.Stub.asInterface(ServiceManager
                                                           .getService("mount"));
            final StorageVolume[] volumes = mMountService.getVolumeList();
            if (volumes.length > VOLUME_SDCARD_INDEX) {
                mVolume = volumes[VOLUME_SDCARD_INDEX];
            }
        } catch (Exception e) {
            Log.e(TAG, "couldn't talk to MountService", e);
        }
    }

}