/**
 *   ownCloud Android client application
 *
 *   @author masensio
 *   @author David A. Velasco
 *   Copyright (C) 2015 ownCloud Inc.
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2,
 *   as published by the Free Software Foundation.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.owncloud.android.files;

import android.accounts.Account;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.support.v4.app.DialogFragment;
import android.webkit.MimeTypeMap;
import android.widget.Toast;

import com.owncloud.android.R;
import com.owncloud.android.authentication.AccountUtils;
import com.owncloud.android.datamodel.OCFile;
import com.owncloud.android.files.services.FileDownloader.FileDownloaderBinder;
import com.owncloud.android.files.services.FileUploader.FileUploaderBinder;
import com.owncloud.android.lib.common.network.WebdavUtils;
import com.owncloud.android.lib.common.utils.Log_OC;
import com.owncloud.android.lib.resources.shares.ShareType;
import com.owncloud.android.lib.resources.status.OwnCloudVersion;
import com.owncloud.android.services.OperationsService;
import com.owncloud.android.services.observer.FileObserverService;
import com.owncloud.android.ui.activity.FileActivity;
import com.owncloud.android.ui.activity.ShareActivity;
import com.owncloud.android.ui.dialog.ShareLinkToDialog;

import org.apache.http.protocol.HTTP;

import java.util.List;

/**
 *
 */
public class FileOperationsHelper {

    private static final String TAG = FileOperationsHelper.class.getName();

    private static final String FTAG_CHOOSER_DIALOG = "CHOOSER_DIALOG";

    protected FileActivity mFileActivity = null;

    /// Identifier of operation in progress which result shouldn't be lost 
    private long mWaitingForOpId = Long.MAX_VALUE;

    public FileOperationsHelper(FileActivity fileActivity) {
        mFileActivity = fileActivity;
    }


    public void openFile(OCFile file) {
        if (file != null) {
            String storagePath = file.getStoragePath();
            String encodedStoragePath = WebdavUtils.encodePath(storagePath);

            Intent intentForSavedMimeType = new Intent(Intent.ACTION_VIEW);
            intentForSavedMimeType.setDataAndType(Uri.parse("file://"+ encodedStoragePath),
                    file.getMimetype());
            intentForSavedMimeType.setFlags(
                    Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION
            );
            
            Intent intentForGuessedMimeType = null;
            if (storagePath.lastIndexOf('.') >= 0) {
                String guessedMimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
                        storagePath.substring(storagePath.lastIndexOf('.') + 1)
                );
                if (guessedMimeType != null && !guessedMimeType.equals(file.getMimetype())) {
                    intentForGuessedMimeType = new Intent(Intent.ACTION_VIEW);
                    intentForGuessedMimeType.
                            setDataAndType(Uri.parse("file://"+ encodedStoragePath),
                                    guessedMimeType);
                    intentForGuessedMimeType.setFlags(
                            Intent.FLAG_GRANT_READ_URI_PERMISSION |
                                    Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                    );
                }
            }

            Intent openFileWithIntent;
            if (intentForGuessedMimeType != null) {
                openFileWithIntent = intentForGuessedMimeType;
            } else {
                openFileWithIntent = intentForSavedMimeType;
            }

            List<ResolveInfo> launchables = mFileActivity.getPackageManager().
                    queryIntentActivities(openFileWithIntent, PackageManager.GET_INTENT_FILTERS);

            if(launchables != null && launchables.size() > 0) {
                try {
                    mFileActivity.startActivity(
                            Intent.createChooser(
                                    openFileWithIntent, mFileActivity.getString(R.string.actionbar_open_with)
                            )
                    );
                } catch (ActivityNotFoundException anfe) {
                    showNoAppForFileTypeToast(mFileActivity.getApplicationContext());
                }
            } else {
                showNoAppForFileTypeToast(mFileActivity.getApplicationContext());
            }

        } else {
            Log_OC.wtf(TAG, "Trying to open a NULL OCFile");
        }
    }

    /**
     * Displays a toast stating that no application could be found to open the file.
     *
     * @param context the context to be able to show a toast.
     */
    private void showNoAppForFileTypeToast(Context context) {
        Toast.makeText(context,
                R.string.file_list_no_app_for_file_type, Toast.LENGTH_SHORT)
                .show();
    }

    public void shareFileWithLink(OCFile file) {

        if (isSharedSupported()) {
            if (file != null) {
                String link = "https://fake.url";
                Intent intent = createShareWithLinkIntent(link);
                String[] packagesToExclude = new String[]{mFileActivity.getPackageName()};
                DialogFragment chooserDialog = ShareLinkToDialog.newInstance(intent,
                        packagesToExclude, file);
                chooserDialog.show(mFileActivity.getSupportFragmentManager(), FTAG_CHOOSER_DIALOG);

            } else {
                Log_OC.wtf(TAG, "Trying to share a NULL OCFile");
            }

        } else {
            // Show a Message
            Toast t = Toast.makeText(
                    mFileActivity, mFileActivity.getString(R.string.share_link_no_support_share_api),
                    Toast.LENGTH_LONG
            );
            t.show();
        }
    }


    public void shareFileWithLinkToApp(OCFile file, String password, Intent sendIntent) {
        
        if (file != null) {
            mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                    getString(R.string.wait_a_moment));

            Intent service = new Intent(mFileActivity, OperationsService.class);
            service.setAction(OperationsService.ACTION_CREATE_SHARE_VIA_LINK);
            service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            service.putExtra(OperationsService.EXTRA_PASSWORD_SHARE, password);
            service.putExtra(OperationsService.EXTRA_SEND_INTENT, sendIntent);
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
            
        } else {
            Log_OC.wtf(TAG, "Trying to open a NULL OCFile");
        }
    }


    private Intent createShareWithLinkIntent(String link) {
        Intent intentToShareLink = new Intent(Intent.ACTION_SEND);
        intentToShareLink.putExtra(Intent.EXTRA_TEXT, link);
        intentToShareLink.setType(HTTP.PLAIN_TEXT_TYPE);
        return intentToShareLink;
    }


    /**
     * @return 'True' if the server supports the Share API
     */
    public boolean isSharedSupported() {
        if (mFileActivity.getAccount() != null) {
            OwnCloudVersion serverVersion = AccountUtils.getServerVersion(mFileActivity.getAccount());
            return (serverVersion != null && serverVersion.isSharedSupported());
        }
        return false;
    }


    public void unshareFileWithLink(OCFile file) {

        // Unshare the file: Create the intent
        Intent unshareService = new Intent(mFileActivity, OperationsService.class);
        unshareService.setAction(OperationsService.ACTION_UNSHARE);
        unshareService.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        unshareService.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        unshareService.putExtra(OperationsService.EXTRA_SHARE_TYPE, ShareType.PUBLIC_LINK);
        unshareService.putExtra(OperationsService.EXTRA_SHARE_WITH, "");

        unshareFile(unshareService);
    }

    public void unshareFileWithUserOrGroup(OCFile file, ShareType shareType, String userOrGroup){

        // Unshare the file: Create the intent
        Intent unshareService = new Intent(mFileActivity, OperationsService.class);
        unshareService.setAction(OperationsService.ACTION_UNSHARE);
        unshareService.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        unshareService.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        unshareService.putExtra(OperationsService.EXTRA_SHARE_TYPE, shareType);
        unshareService.putExtra(OperationsService.EXTRA_SHARE_WITH, userOrGroup);

        unshareFile(unshareService);
    }


    private void unshareFile(Intent unshareService){
        if (isSharedSupported()) {
            // Unshare the file
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().
                    queueNewOperation(unshareService);

            mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                    getString(R.string.wait_a_moment));

        } else {
            // Show a Message
            Toast t = Toast.makeText(mFileActivity,
                    mFileActivity.getString(R.string.share_link_no_support_share_api),
                    Toast.LENGTH_LONG);
            t.show();

        }
    }

    public void showShareFile(OCFile file){
        Intent intent = new Intent(mFileActivity, ShareActivity.class);
        intent.putExtra(mFileActivity.EXTRA_FILE, file);
        intent.putExtra(mFileActivity.EXTRA_ACCOUNT, mFileActivity.getAccount());
        mFileActivity.startActivity(intent);

    }


    /**
     * @return 'True' if the server supports the Search Users API
     */
    public boolean isSearchUsersSupportedSupported() {
        if (mFileActivity.getAccount() != null) {
            OwnCloudVersion serverVersion = AccountUtils.getServerVersion(mFileActivity.getAccount());
            return (serverVersion != null && serverVersion.isSearchUsersSupported());
        }
        return false;
    }

    public void sendDownloadedFile(OCFile file) {
        if (file != null) {
            String storagePath = file.getStoragePath();
            String encodedStoragePath = WebdavUtils.encodePath(storagePath);
            Intent sendIntent = new Intent(android.content.Intent.ACTION_SEND);
            // set MimeType
            sendIntent.setType(file.getMimetype());
            sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + encodedStoragePath));
            sendIntent.putExtra(Intent.ACTION_SEND, true);      // Send Action

            // Show dialog, without the own app
            String[] packagesToExclude = new String[]{mFileActivity.getPackageName()};
            DialogFragment chooserDialog = ShareLinkToDialog.newInstance(sendIntent,
                    packagesToExclude, file);
            chooserDialog.show(mFileActivity.getSupportFragmentManager(), FTAG_CHOOSER_DIALOG);

        } else {
            Log_OC.wtf(TAG, "Trying to send a NULL OCFile");
        }
    }

    /**
     * Request the synchronization of a file or folder with the OC server, including its contents.
     *
     * @param file          The file or folder to synchronize
     */
    public void syncFile(OCFile file) {
        if (!file.isFolder()){
            Intent intent = new Intent(mFileActivity, OperationsService.class);
            intent.setAction(OperationsService.ACTION_SYNC_FILE);
            intent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            intent.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            intent.putExtra(OperationsService.EXTRA_SYNC_FILE_CONTENTS, true);
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(intent);
            mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                    getString(R.string.wait_a_moment));
            
        } else {
            Intent intent = new Intent(mFileActivity, OperationsService.class);
            intent.setAction(OperationsService.ACTION_SYNC_FOLDER);
            intent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            intent.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            mFileActivity.startService(intent);

        }
    }

    public void toggleFavorite(OCFile file, boolean isFavorite) {
        file.setFavorite(isFavorite);
        mFileActivity.getStorageManager().saveFile(file);

        /// register the OCFile instance in the observer service to monitor local updates
        Intent observedFileIntent = FileObserverService.makeObservedFileIntent(
                mFileActivity,
                file,
                mFileActivity.getAccount(),
                isFavorite);
        mFileActivity.startService(observedFileIntent);

        /// immediate content synchronization
        if (file.isFavorite()) {
            syncFile(file);
        }
    }
    
    public void renameFile(OCFile file, String newFilename) {
        // RenameFile
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_RENAME);
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        service.putExtra(OperationsService.EXTRA_NEWNAME, newFilename);
        mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
        
        mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                getString(R.string.wait_a_moment));
    }


    public void removeFile(OCFile file, boolean onlyLocalCopy) {
        // RemoveFile
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_REMOVE);
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        service.putExtra(OperationsService.EXTRA_REMOVE_ONLY_LOCAL, onlyLocalCopy);
        mWaitingForOpId =  mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
        
        mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                getString(R.string.wait_a_moment));
    }


    public void createFolder(String remotePath, boolean createFullPath) {
        // Create Folder
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_CREATE_FOLDER);
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, remotePath);
        service.putExtra(OperationsService.EXTRA_CREATE_FULL_PATH, createFullPath);
        mWaitingForOpId =  mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
        
        mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                getString(R.string.wait_a_moment));
    }

    /**
     * Cancel the transference in downloads (files/folders) and file uploads
     * @param file OCFile
     */
    public void cancelTransference(OCFile file) {
        Account account = mFileActivity.getAccount();
        if (file.isFolder()) {
            OperationsService.OperationsServiceBinder opsBinder =
                    mFileActivity.getOperationsServiceBinder();
            if (opsBinder != null) {
                opsBinder.cancel(account, file);
            }
        }

        // for both files and folders
        FileDownloaderBinder downloaderBinder = mFileActivity.getFileDownloaderBinder();
        if (downloaderBinder != null && downloaderBinder.isDownloading(account, file)) {
            downloaderBinder.cancel(account, file);
        }
        FileUploaderBinder uploaderBinder = mFileActivity.getFileUploaderBinder();
        if (uploaderBinder != null && uploaderBinder.isUploading(account, file)) {
            uploaderBinder.cancel(account, file);
        }
    }

    /**
     * Start move file operation
     *
     * @param newfile     File where it is going to be moved
     * @param currentFile File with the previous info
     */
    public void moveFile(OCFile newfile, OCFile currentFile) {
        // Move files
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_MOVE_FILE);
        service.putExtra(OperationsService.EXTRA_NEW_PARENT_PATH, newfile.getRemotePath());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, currentFile.getRemotePath());
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        mWaitingForOpId =  mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

        mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                getString(R.string.wait_a_moment));
    }

    /**
     * Start copy file operation
     *
     * @param newfile     File where it is going to be moved
     * @param currentFile File with the previous info
     */
    public void copyFile(OCFile newfile, OCFile currentFile) {
        // Copy files
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_COPY_FILE);
        service.putExtra(OperationsService.EXTRA_NEW_PARENT_PATH, newfile.getRemotePath());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, currentFile.getRemotePath());
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

        mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                getString(R.string.wait_a_moment));
    }

    public long getOpIdWaitingFor() {
        return mWaitingForOpId;
    }


    public void setOpIdWaitingFor(long waitingForOpId) {
        mWaitingForOpId = waitingForOpId;
    }

    /**
     *  @return 'True' if the server doesn't need to check forbidden characters
     */
    public boolean isVersionWithForbiddenCharacters() {
        if (mFileActivity.getAccount() != null) {
            OwnCloudVersion serverVersion =
                    AccountUtils.getServerVersion(mFileActivity.getAccount());
            return (serverVersion != null && serverVersion.isVersionWithForbiddenCharacters());
        }
        return false;
    }
}