package eu.faircode.email;

/*
    This file is part of Safe email.

    Safe email 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.

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

    Copyright 2018 by Marcel Bokhorst (M66B)
*/

import android.arch.lifecycle.LiveData;
import android.arch.lifecycle.Observer;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.constraint.Group;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.text.Html;
import android.text.method.LinkMovementMethod;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FragmentMessage extends Fragment {
    private TextView tvTime;
    private TextView tvFrom;
    private TextView tvSubject;
    private TextView tvCount;
    private BottomNavigationView top_navigation;
    private TextView tvBody;
    private BottomNavigationView bottom_navigation;
    private ProgressBar pbWait;
    private Group grpReady;

    private LiveData<TupleFolderEx> liveFolder;

    private ExecutorService executor = Executors.newCachedThreadPool();
    private DateFormat df = SimpleDateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);

    @Override
    @Nullable
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_message, container, false);

        // Get arguments
        Bundle args = getArguments();
        final long folder = args.getLong("folder");
        final long id = args.getLong("id");

        // Get controls
        tvFrom = view.findViewById(R.id.tvAddress);
        tvTime = view.findViewById(R.id.tvTime);
        tvSubject = view.findViewById(R.id.tvSubject);
        tvCount = view.findViewById(R.id.tvCount);
        top_navigation = view.findViewById(R.id.top_navigation);
        tvBody = view.findViewById(R.id.tvBody);
        bottom_navigation = view.findViewById(R.id.bottom_navigation);
        pbWait = view.findViewById(R.id.pbWait);
        grpReady = view.findViewById(R.id.grpReady);

        tvTime.setTextIsSelectable(true);
        tvFrom.setTextIsSelectable(true);
        tvSubject.setTextIsSelectable(true);
        tvBody.setTextIsSelectable(true);
        tvBody.setMovementMethod(LinkMovementMethod.getInstance());

        // Wire controls

        top_navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.action_seen:
                        onActionSeen(id);
                        return true;
                    case R.id.action_thread:
                        onActionThread(id);
                        return true;
                    case R.id.action_move:
                        onActionMove(id);
                        return true;
                    case R.id.action_forward:
                        onActionForward(id);
                        return true;
                    case R.id.action_reply_all:
                        onActionReplyAll(id);
                        return true;
                }
                return false;
            }
        });

        bottom_navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.action_delete:
                        onActionDelete(id);
                        return true;
                    case R.id.action_spam:
                        onActionSpam(id);
                        return true;
                    case R.id.action_archive:
                        onActionArchive(id);
                        return true;
                    case R.id.action_reply:
                        onActionReply(id);
                        return true;
                }
                return false;
            }
        });

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

        DB db = DB.getInstance(getContext());

        // Observe folder
        liveFolder = db.folder().liveFolderEx(folder);

        // Observe message
        db.message().liveMessage(id).observe(this, new Observer<TupleMessageEx>() {
            @Override
            public void onChanged(@Nullable TupleMessageEx message) {
                pbWait.setVisibility(View.GONE);
                grpReady.setVisibility(View.VISIBLE);

                if (message == null || message.ui_hide) {
                    // Message gone (moved, deleted)
                    if (FragmentMessage.this.isVisible())
                        getFragmentManager().popBackStack();
                } else {
                    tvFrom.setText(message.from == null ? null : MessageHelper.getFormattedAddresses(message.from));
                    tvTime.setText(message.sent == null ? null : df.format(new Date(message.sent)));
                    tvSubject.setText(message.subject);
                    tvCount.setText(Integer.toString(message.count));
                    tvCount.setVisibility(message.count > 1 ? View.VISIBLE : View.GONE);

                    int visibility = (message.ui_seen ? Typeface.NORMAL : Typeface.BOLD);
                    tvFrom.setTypeface(null, visibility);
                    tvTime.setTypeface(null, visibility);
                    tvSubject.setTypeface(null, visibility);
                    tvCount.setTypeface(null, visibility);

                    MenuItem actionSeen = top_navigation.getMenu().findItem(R.id.action_seen);
                    actionSeen.setIcon(message.ui_seen
                            ? R.drawable.baseline_visibility_off_24
                            : R.drawable.baseline_visibility_24);
                    actionSeen.setTitle(message.ui_seen ? R.string.title_unseen : R.string.title_seen);

                    tvBody.setText(message.body == null
                            ? null
                            : Html.fromHtml(HtmlHelper.sanitize(getContext(), message.body, false)));
                }
            }
        });

        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        liveFolder.observe(this, folderObserver);
    }

    @Override
    public void onPause() {
        super.onPause();
        liveFolder.removeObservers(this);
    }

    Observer<TupleFolderEx> folderObserver = new Observer<TupleFolderEx>() {
        @Override
        public void onChanged(@Nullable TupleFolderEx folder) {
            ((AppCompatActivity) getActivity()).getSupportActionBar().setSubtitle(folder == null
                    ? null
                    : Helper.localizeFolderName(getContext(), folder));
        }
    };

    private void onActionSeen(final long id) {
        executor.submit(new Runnable() {
            @Override
            public void run() {
                DB db = DB.getInstance(getContext());
                EntityMessage message = db.message().getMessage(id);
                message.ui_seen = !message.ui_seen;
                db.message().updateMessage(message);
                EntityOperation.queue(getContext(), message, EntityOperation.SEEN, message.ui_seen);
            }
        });
    }

    private void onActionThread(long id) {
        FragmentMessages fragment = new FragmentMessages();
        Bundle args = new Bundle();
        args.putLong("thread", id); // message ID
        fragment.setArguments(args);

        FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("thread");
        fragmentTransaction.commit();
    }

    private void onActionMove(final long id) {
        Toast.makeText(getContext(), "Not implemented yet", Toast.LENGTH_LONG).show();
    }

    private void onActionForward(long id) {
        startActivity(new Intent(getContext(), ActivityCompose.class)
                .putExtra("id", id)
                .putExtra("action", "forward"));
    }

    private void onActionReplyAll(long id) {
        startActivity(new Intent(getContext(), ActivityCompose.class)
                .putExtra("id", id)
                .putExtra("action", "reply_all"));
    }

    private void onActionDelete(final long id) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder
                .setMessage(R.string.title_ask_delete)
                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        executor.submit(new Runnable() {
                            @Override
                            public void run() {
                                DB db = DB.getInstance(getContext());
                                EntityMessage message = db.message().getMessage(id);
                                message.ui_hide = true;
                                db.message().updateMessage(message);

                                EntityOperation.queue(getContext(), message, EntityOperation.DELETE);
                            }
                        });
                    }
                })
                .setNegativeButton(android.R.string.cancel, null).show();
    }

    private void onActionSpam(final long id) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder
                .setMessage(R.string.title_ask_spam)
                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        executor.submit(new Runnable() {
                            @Override
                            public void run() {
                                DB db = DB.getInstance(getContext());
                                EntityMessage message = db.message().getMessage(id);
                                EntityFolder spam = db.folder().getSpamFolder(message.account);
                                if (spam == null) {
                                    Toast.makeText(getContext(), R.string.title_no_spam, Toast.LENGTH_LONG).show();
                                    return;
                                }

                                message.ui_hide = true;
                                db.message().updateMessage(message);

                                EntityOperation.queue(getContext(), message, EntityOperation.MOVE, spam.id);
                            }
                        });
                    }
                })
                .setNegativeButton(android.R.string.cancel, null).show();
    }

    private void onActionArchive(final long id) {
        executor.submit(new Runnable() {
            @Override
            public void run() {
                DB db = DB.getInstance(getContext());
                EntityMessage message = db.message().getMessage(id);
                EntityFolder archive = db.folder().getArchiveFolder(message.account);
                if (archive == null) {
                    Toast.makeText(getContext(), R.string.title_no_archive, Toast.LENGTH_LONG).show();
                    return;
                }

                message.ui_hide = true;
                db.message().updateMessage(message);

                EntityOperation.queue(getContext(), message, EntityOperation.MOVE, archive.id);
            }
        });
    }

    private void onActionReply(long id) {
        startActivity(new Intent(getContext(), ActivityCompose.class)
                .putExtra("id", id)
                .putExtra("action", "reply"));
    }
}