/*
 * Nextcloud Android client application
 *
 * @author Andy Scherzinger
 * Copyright (C) 2018 Andy Scherzinger
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * 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 AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.owncloud.android.ui.fragment;

import android.accounts.Account;
import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v7.widget.AppCompatCheckBox;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupMenu;
import android.widget.TextView;

import com.owncloud.android.R;
import com.owncloud.android.datamodel.FileDataStorageManager;
import com.owncloud.android.datamodel.OCFile;
import com.owncloud.android.lib.common.operations.RemoteOperationResult;
import com.owncloud.android.lib.resources.shares.OCShare;
import com.owncloud.android.lib.resources.shares.SharePermissionsBuilder;
import com.owncloud.android.lib.resources.shares.ShareType;
import com.owncloud.android.lib.resources.status.OCCapability;
import com.owncloud.android.ui.activity.FileActivity;
import com.owncloud.android.ui.adapter.UserListAdapter;
import com.owncloud.android.ui.decoration.SimpleListItemDividerDecoration;
import com.owncloud.android.ui.dialog.ExpirationDatePickerDialogFragment;
import com.owncloud.android.ui.dialog.SharePasswordDialogFragment;
import com.owncloud.android.ui.fragment.util.FileDetailSharingFragmentHelper;
import com.owncloud.android.utils.ThemeUtils;

import java.util.ArrayList;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import butterknife.Unbinder;

public class FileDetailSharingFragment extends Fragment implements UserListAdapter.ShareeListAdapterListener {

    private static final String ARG_FILE = "FILE";
    private static final String ARG_ACCOUNT = "ACCOUNT";

    // to show share with users/groups info
    private ArrayList<OCShare> shares;

    private OCFile file;
    private Account account;
    private OCCapability capabilities;
    private OCShare publicShare;

    private Unbinder unbinder;

    @BindView(R.id.searchView)
    SearchView searchView;

    @BindView(R.id.fdshareUsersList)
    RecyclerView usersList;

    @BindView(R.id.fdShareNoUsers)
    TextView noList;

    @BindView(R.id.share_by_link)
    AppCompatCheckBox shareByLink;

    @BindView(R.id.overflow_menu_share_link)
    ImageView overflowMenuShareLink;

    @BindView(R.id.share_by_link_allow_editing)
    AppCompatCheckBox shareByLinkAllowEditing;

    @BindView(R.id.share_by_link_container)
    LinearLayout shareByLinkContainer;

    public static FileDetailSharingFragment newInstance(OCFile file, Account account) {
        FileDetailSharingFragment fragment = new FileDetailSharingFragment();
        Bundle args = new Bundle();
        args.putParcelable(ARG_FILE, file);
        args.putParcelable(ARG_ACCOUNT, account);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        refreshCapabilitiesFromDB();
        refreshPublicShareFromDB();
    }

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        file = getArguments().getParcelable(ARG_FILE);
        account = getArguments().getParcelable(ARG_ACCOUNT);

        if (savedInstanceState != null) {
            file = savedInstanceState.getParcelable(FileActivity.EXTRA_FILE);
            account = savedInstanceState.getParcelable(FileActivity.EXTRA_ACCOUNT);
        }

        View view = inflater.inflate(R.layout.file_details_sharing_fragment, container, false);
        unbinder = ButterKnife.bind(this, view);

        setupView();

        return view;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        unbinder.unbind();
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (!(getActivity() instanceof FileActivity)) {
            throw new IllegalArgumentException("Calling activity must be of type FileActivity");
        }
    }

    private void setupView() {
        setShareByLinkInfo(file.isSharedViaLink());
        setShareWithUserInfo();
        FileDetailSharingFragmentHelper.setupSearchView(
                (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE),
                searchView,
                getActivity().getComponentName()
        );
    }

    /**
     * Updates Share by link UI
     *
     * @param isShareByLink flag is share by link is enable
     */
    public void setShareByLinkInfo(boolean isShareByLink) {
        shareByLink.setChecked(isShareByLink);
        int accentColor = ThemeUtils.primaryAccentColor(getContext());
        ThemeUtils.tintCheckbox(shareByLink, accentColor);
        ThemeUtils.tintCheckbox(shareByLinkAllowEditing, accentColor);
        setLinkDetailVisible(isShareByLink);
    }

    private void setLinkDetailVisible(boolean visible) {
        if (visible) {
            if (file.isFolder()) {
                shareByLinkAllowEditing.setVisibility(View.VISIBLE);
            } else {
                shareByLinkAllowEditing.setVisibility(View.INVISIBLE);
            }
            overflowMenuShareLink.setVisibility(View.VISIBLE);
        } else {
            shareByLinkAllowEditing.setVisibility(View.INVISIBLE);
            overflowMenuShareLink.setVisibility(View.INVISIBLE);
        }
    }

    /**
     * Update Share With data
     */
    public void setShareWithUserInfo() {
        // Get Users and Groups
        if (((FileActivity) getActivity()).getStorageManager() != null) {
            FileDataStorageManager fileDataStorageManager = ((FileActivity) getActivity()).getStorageManager();

            shares = fileDataStorageManager.getSharesWithForAFile(file.getRemotePath(), account.name);

            // Update list of users/groups
            updateListOfUserGroups();
        }
    }

    private void updateListOfUserGroups() {
        // TODO Refactoring: create a new {@link ShareUserListAdapter} instance with every call should not be needed

        if (shares.size() > 0) {
            usersList.setVisibility(View.VISIBLE);
            usersList.setAdapter(new UserListAdapter(getActivity().getSupportFragmentManager(),
                    getActivity().getApplicationContext(), shares, account, file, this));
            usersList.setLayoutManager(new LinearLayoutManager(getContext()));
            usersList.addItemDecoration(new SimpleListItemDividerDecoration(getContext()));
            noList.setVisibility(View.GONE);
        } else {
            usersList.setVisibility(View.GONE);
            noList.setVisibility(View.VISIBLE);
        }
    }

    @OnClick(R.id.share_by_link)
    public void toggleShareByLink() {
        if (shareByLink.isChecked()) {
            if (capabilities != null &&
                    capabilities.getFilesSharingPublicPasswordEnforced().isTrue()) {
                // password enforced by server, request to the user before trying to create
                requestPasswordForShareViaLink(true);

            } else {
                // create without password if not enforced by server or we don't know if enforced;
                ((FileActivity) getActivity()).getFileOperationsHelper().shareFileViaLink(file, null);
            }

        } else {
            ((FileActivity) getActivity()).getFileOperationsHelper().unshareFileViaLink(file);
        }
    }

    @OnClick(R.id.share_link_label)
    public void showSendLinkTo() {
        if (file.isSharedViaLink()) {
            ((FileActivity) getActivity()).getFileOperationsHelper().getFileWithLink(file);
        }
    }

    @OnClick(R.id.share_by_link_allow_editing)
    public void toggleShareLinkAllowEditing() {
        if (file.isSharedViaLink()) {
            ((FileActivity) getActivity()).getFileOperationsHelper()
                    .setUploadPermissionsToShare(file, shareByLinkAllowEditing.isChecked());
        }
    }

    @OnClick(R.id.overflow_menu_share_link)
    public void showLinkOverflowMenu() {
        Context context = getContext();
        if (context != null && ThemeUtils.themingEnabled(context)) {
            // use grey as fallback for elements where custom theming is not available
            context.getTheme().applyStyle(R.style.FallbackThemingTheme, true);
        } else {
            context = getActivity();
        }

        PopupMenu popup = new PopupMenu(context, overflowMenuShareLink);
        popup.inflate(R.menu.file_detail_sharing_link_menu);
        prepareOptionsMenu(popup.getMenu());
        popup.setOnMenuItemClickListener(this::optionsItemSelected);
        popup.show();
    }

    private void prepareOptionsMenu(Menu menu) {
        Resources res = getResources();
        FileDetailSharingFragmentHelper.setupHideFileListingMenuItem(
                menu.findItem(R.id.action_share_link_hide_file_listing),
                file.isFolder(),
                shareByLinkAllowEditing.isChecked(),
                publicShare.getPermissions()
        );
        FileDetailSharingFragmentHelper.setupPasswordMenuItem(
                menu.findItem(R.id.action_share_link_password),
                publicShare.isPasswordProtected(),
                res
        );
        FileDetailSharingFragmentHelper.setupExpirationDateMenuItem(
                menu.findItem(R.id.action_share_link_expiration_date),
                publicShare.getExpirationDate(),
                res
        );
    }

    private boolean optionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_share_link_hide_file_listing: {
                item.setChecked(!item.isChecked());
                if (capabilities.getFilesFileDrop().isTrue()) {
                    ((FileActivity) getActivity()).getFileOperationsHelper().
                            setHideFileListingPermissionsToShare(publicShare, item.isChecked());
                } else {
                    // not supported in ownCloud
                    Snackbar.make(getView(), R.string.files_drop_not_supported, Snackbar.LENGTH_LONG)
                            .setAction(R.string.learn_more, v -> {
                                Intent i = new Intent(Intent.ACTION_VIEW);
                                i.setData(Uri.parse(getString(R.string.url_server_install)));
                                startActivity(i);
                            })
                            .show();
                }
                return true;
            }
            case R.id.action_share_link_password: {
                requestPasswordForShareViaLink(false);
                return true;
            }
            case R.id.action_share_link_expiration_date: {
                ExpirationDatePickerDialogFragment dialog = ExpirationDatePickerDialogFragment.newInstance(file, -1);
                dialog.show(
                        getActivity().getSupportFragmentManager(),
                        ExpirationDatePickerDialogFragment.DATE_PICKER_DIALOG
                );
                return true;
            }
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    /**
     * Updates the UI after the result of an update operation on the edited {@link OCFile}.
     *
     * @param result {@link RemoteOperationResult} of an update on the edited {@link OCFile} sharing information.
     * @param file   the edited {@link OCFile}
     */
    public void onUpdateShareInformation(RemoteOperationResult result, OCFile file) {
        this.file = file;

        if (result.isSuccess()) {
            refreshUiFromDB();
        } else {
            setupView();
        }
    }

    /**
     * Get {@link OCShare} instance from DB and updates the UI.
     *
     * Depends on the parent Activity provides a {@link com.owncloud.android.datamodel.FileDataStorageManager}
     * instance ready to use. If not ready, does nothing.
     */
    private void refreshUiFromDB() {
        FileDataStorageManager storageManager = ((FileActivity) getActivity()).getStorageManager();
        if (storageManager != null) {
            if (publicShare != null) {
                // Get edited shared by link
                publicShare = storageManager.getShareById(publicShare.getId());
            }

            // Updates UI with new state
            setupView();
        }
    }

    @Override
    public void unshareWith(OCShare share) {
        ((FileActivity) getActivity()).getFileOperationsHelper()
                .unshareFileWithUserOrGroup(file, share.getShareType(), share.getShareWith());
    }

    @Override
    public int updatePermissionsToShare(OCShare share, boolean canReshare, boolean canEdit,
                                        boolean canEditCreate, boolean canEditChange,
                                        boolean canEditDelete) {
        SharePermissionsBuilder spb = new SharePermissionsBuilder();
        spb.setSharePermission(canReshare);
        if (file.isFolder()) {
            spb.setUpdatePermission(canEditChange)
                    .setCreatePermission(canEditCreate)
                    .setDeletePermission(canEditDelete);
        } else {
            spb.setUpdatePermission(canEdit);
        }
        int permissions = spb.build();

        ((FileActivity) getActivity()).getFileOperationsHelper().
                setPermissionsToShare(
                        share,
                        permissions
                )
        ;

        return permissions;
    }

    /**
     * Starts a dialog that requests a password to the user to protect a share link.
     *
     * @param createShare When 'true', the request for password will be followed by the creation of a new
     *                    public link; when 'false', a public share is assumed to exist, and the password
     *                    is bound to it.
     */
    public void requestPasswordForShareViaLink(boolean createShare) {
        SharePasswordDialogFragment dialog = SharePasswordDialogFragment.newInstance(file, createShare);
        dialog.show(getChildFragmentManager(), SharePasswordDialogFragment.PASSWORD_FRAGMENT);
    }

    /**
     * Get known server capabilities from DB
     * 
     * Depends on the parent Activity provides a {@link com.owncloud.android.datamodel.FileDataStorageManager}
     * instance ready to use. If not ready, does nothing.
     */
    public void refreshCapabilitiesFromDB() {
        if (((FileActivity) getActivity()).getStorageManager() != null) {
            capabilities = ((FileActivity) getActivity()).getStorageManager().getCapability(account.name);
        }
    }

    /**
     * Get public link from the DB to fill in the "Share link" section in the UI.
     * 
     * Takes into account server capabilities before reading database.
     * 
     * Depends on the parent Activity provides a {@link com.owncloud.android.datamodel.FileDataStorageManager}
     * instance ready to use. If not ready, does nothing.
     */
    public void refreshPublicShareFromDB() {
        if (FileDetailSharingFragmentHelper.isPublicShareDisabled(capabilities)) {
            shareByLinkContainer.setVisibility(View.GONE);
        } else if (((FileActivity) getActivity()).getStorageManager() != null) {
            // Get public share
            publicShare = ((FileActivity) getActivity()).getStorageManager().getFirstShareByPathAndType(
                    file.getRemotePath(),
                    ShareType.PUBLIC_LINK,
                    ""
            );

            // Update public share section
            updatePublicShareSection();
        }
    }

    /**
     * Updates in the UI the section about public share with the information
     * in the current public share bound to, if any.
     */
    private void updatePublicShareSection() {
        if (publicShare != null && ShareType.PUBLIC_LINK.equals(publicShare.getShareType())) {
            shareByLink.setChecked(true);

            if (publicShare.getPermissions() > OCShare.READ_PERMISSION_FLAG) {
                shareByLinkAllowEditing.setChecked(true);
            } else {
                shareByLinkAllowEditing.setChecked(false);
            }

            setShareByLinkInfo(true);
        } else {
            setShareByLinkInfo(false);
        }
    }
}