package eu.faircode.email;

/*
    This file is part of FairEmail.

    FairEmail is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    FairEmail 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 FairEmail.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018-2022 by Marcel Bokhorst (M66B)
*/

import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.constraintlayout.widget.Group;
import androidx.lifecycle.Observer;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class FragmentOperations extends FragmentBase {
    private TextView tvNoOperation;
    private RecyclerView rvOperation;
    private ContentLoadingProgressBar pbWait;
    private Group grpReady;

    private AdapterOperation adapter;

    @Override
    @Nullable
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        setSubtitle(R.string.menu_operations);
        setHasOptionsMenu(true);

        View view = inflater.inflate(R.layout.fragment_operations, container, false);

        // Get controls
        tvNoOperation = view.findViewById(R.id.tvNoOperation);
        rvOperation = view.findViewById(R.id.rvOperation);
        pbWait = view.findViewById(R.id.pbWait);
        grpReady = view.findViewById(R.id.grpReady);

        // Wire controls

        rvOperation.setHasFixedSize(true);
        LinearLayoutManager llm = new LinearLayoutManager(getContext());
        rvOperation.setLayoutManager(llm);

        adapter = new AdapterOperation(this);
        rvOperation.setAdapter(adapter);

        // Initialize
        tvNoOperation.setVisibility(View.GONE);
        grpReady.setVisibility(View.GONE);
        pbWait.setVisibility(View.VISIBLE);

        return view;
    }

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

        // Observe folders
        DB db = DB.getInstance(getContext());
        db.operation().liveOperations().observe(getViewLifecycleOwner(), new Observer<List<TupleOperationEx>>() {
            @Override
            public void onChanged(@Nullable List<TupleOperationEx> operations) {
                if (operations == null)
                    operations = new ArrayList<>();

                tvNoOperation.setVisibility(operations.size() == 0 ? View.VISIBLE : View.GONE);
                adapter.set(operations);

                pbWait.setVisibility(View.GONE);
                grpReady.setVisibility(View.VISIBLE);
            }
        });
    }

    @Override
    public void onCreateOptionsMenu(@NonNull Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu_operations, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        if (itemId == R.id.menu_help) {
            onMenuHelp();
            return true;
        } else if (itemId == R.id.menu_delete) {
            new FragmentDialogDelete().show(getParentFragmentManager(), "operations:delete");
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void onMenuHelp() {
        Helper.viewFAQ(getContext(), 3);
    }

    public static class FragmentDialogDelete extends FragmentDialogBase {
        @NonNull
        @Override
        public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
            final Context context = getContext();
            final View dview = LayoutInflater.from(context).inflate(R.layout.dialog_delete_operations, null);
            final CheckBox cbError = dview.findViewById(R.id.cbError);
            final CheckBox cbFetch = dview.findViewById(R.id.cbFetch);
            final CheckBox cbMove = dview.findViewById(R.id.cbMove);
            final CheckBox cbFlag = dview.findViewById(R.id.cbFlag);
            final CheckBox cbDelete = dview.findViewById(R.id.cbDelete);

            return new AlertDialog.Builder(context)
                    .setView(dview)
                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Bundle args = new Bundle();
                            args.putBoolean("error", cbError.isChecked());
                            args.putBoolean("fetch", cbFetch.isChecked());
                            args.putBoolean("move", cbMove.isChecked());
                            args.putBoolean("flag", cbFlag.isChecked());
                            args.putBoolean("delete", cbDelete.isChecked());

                            new SimpleTask<Integer>() {
                                private Toast toast = null;

                                @Override
                                protected void onPostExecute(Bundle args) {
                                    toast = ToastEx.makeText(context, R.string.title_executing, Toast.LENGTH_LONG);
                                    toast.show();
                                }

                                @Override
                                protected void onPreExecute(Bundle args) {
                                    if (toast != null)
                                        toast.cancel();
                                }

                                @Override
                                protected Integer onExecute(Context context, Bundle args) {
                                    boolean error = args.getBoolean("error");
                                    boolean fetch = args.getBoolean("fetch");
                                    boolean move = args.getBoolean("move");
                                    boolean flag = args.getBoolean("flag");
                                    boolean delete = args.getBoolean("delete");

                                    int deleted = 0;
                                    DB db = DB.getInstance(context);
                                    try {
                                        db.beginTransaction();

                                        List<EntityOperation> ops = new ArrayList<>();

                                        if (error)
                                            addAll(ops, db.operation().getOperationsError());

                                        if (fetch) {
                                            addAll(ops, db.operation().getOperations(EntityOperation.FETCH));
                                            addAll(ops, db.operation().getOperations(EntityOperation.BODY));
                                            addAll(ops, db.operation().getOperations(EntityOperation.ATTACHMENT));
                                            addAll(ops, db.operation().getOperations(EntityOperation.HEADERS));
                                            addAll(ops, db.operation().getOperations(EntityOperation.SYNC));
                                        }

                                        if (move) {
                                            addAll(ops, db.operation().getOperations(EntityOperation.MOVE));
                                            addAll(ops, db.operation().getOperations(EntityOperation.COPY));
                                        }

                                        if (flag) {
                                            addAll(ops, db.operation().getOperations(EntityOperation.SEEN));
                                            addAll(ops, db.operation().getOperations(EntityOperation.ANSWERED));
                                            addAll(ops, db.operation().getOperations(EntityOperation.FLAG));
                                            addAll(ops, db.operation().getOperations(EntityOperation.KEYWORD));
                                            addAll(ops, db.operation().getOperations(EntityOperation.LABEL));
                                        }

                                        if (delete) {
                                            addAll(ops, db.operation().getOperations(EntityOperation.DELETE));
                                            addAll(ops, db.operation().getOperations(EntityOperation.PURGE));
                                            addAll(ops, db.operation().getOperations(EntityOperation.EXPUNGE));
                                        }

                                        for (EntityOperation op : ops) {
                                            EntityLog.log(context, "Deleting operation=" + op.id + ":" + op.name + " error=" + op.error);

                                            if (db.operation().deleteOperation(op.id) > 0) {
                                                op.cleanup(context, false);
                                                deleted++;
                                            }

                                            if (EntityOperation.SYNC.equals(op.name))
                                                db.folder().setFolderSyncState(op.folder, null);
                                        }

                                        db.setTransactionSuccessful();
                                    } finally {
                                        db.endTransaction();
                                    }

                                    return deleted;
                                }

                                @Override
                                protected void onExecuted(Bundle args, Integer deleted) {
                                    if (deleted == null)
                                        deleted = -1;
                                    Context context = getContext();
                                    if (context == null)
                                        return;
                                    ToastEx.makeText(
                                            context,
                                            getString(R.string.title_delete_operation_deleted, deleted),
                                            Toast.LENGTH_LONG).show();
                                }

                                @Override
                                protected void onException(Bundle args, Throwable ex) {
                                    Log.unexpectedError(getParentFragmentManager(), ex);
                                }

                                private void addAll(List<EntityOperation> list, List<EntityOperation> sublist) {
                                    if (sublist != null)
                                        list.addAll(sublist);
                                }
                            }.execute(context, getActivity(), args, "operations:delete");
                        }
                    })
                    .setNegativeButton(android.R.string.cancel, null)
                    .create();
        }
    }
}