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 2018-2019 by Marcel Bokhorst (M66B)
*/

import android.app.IntentService;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;

import androidx.annotation.Nullable;
import androidx.preference.PreferenceManager;

import java.util.List;

public class ServiceUI extends IntentService {
    static final int PI_CLEAR = 1;
    static final int PI_TRASH = 2;
    static final int PI_ARCHIVE = 3;
    static final int PI_FLAG = 4;
    static final int PI_SEEN = 5;
    static final int PI_IGNORED = 6;
    static final int PI_SNOOZED = 7;

    public ServiceUI() {
        this(ServiceUI.class.getName());
    }

    public ServiceUI(String name) {
        super(name);
    }

    @Override
    public void onCreate() {
        Log.i("Service UI create");
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        Log.i("Service UI destroy");
        super.onDestroy();
    }

    @Override
    protected void onHandleIntent(@Nullable Intent intent) {
        // Under certain circumstances, a background app is placed on a temporary whitelist for several minutes
        // - Executing a PendingIntent from a notification.
        // https://developer.android.com/about/versions/oreo/background#services
        Log.i("Service UI intent=" + intent);

        if (intent == null)
            return;

        String action = intent.getAction();
        if (action == null)
            return;

        String[] parts = action.split(":");
        long id = (parts.length > 1 ? Long.parseLong(parts[1]) : -1);

        switch (parts[0]) {
            case "clear":
                onClear();
                break;

            case "trash":
                cancel(intent.getStringExtra("group"), id);
                onTrash(id);
                break;

            case "archive":
                cancel(intent.getStringExtra("group"), id);
                onArchive(id);
                break;

            case "flag":
                cancel(intent.getStringExtra("group"), id);
                onFlag(id);
                break;

            case "seen":
                cancel(intent.getStringExtra("group"), id);
                onSeen(id);
                break;

            case "ignore":
                onIgnore(id);
                break;

            case "snooze":
                // AlarmManager.RTC_WAKEUP
                // When the alarm is dispatched, the app will also be added to the system's temporary whitelist
                // for approximately 10 seconds to allow that application to acquire further wake locks in which to complete its work.
                // https://developer.android.com/reference/android/app/AlarmManager
                onSnooze(id);
                break;
            default:
                Log.w("Unknown action: " + parts[0]);
        }
    }

    private void onClear() {
        DB.getInstance(this).message().ignoreAll();
    }

    private void cancel(String group, long id) {
        String tag = "unseen." + group + ":" + id;

        NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        nm.cancel(tag, 1);
    }

    private void onTrash(long id) {
        DB db = DB.getInstance(this);
        try {
            db.beginTransaction();

            EntityMessage message = db.message().getMessage(id);
            if (message != null) {
                EntityFolder trash = db.folder().getFolderByType(message.account, EntityFolder.TRASH);
                if (trash != null)
                    EntityOperation.queue(this, message, EntityOperation.MOVE, trash.id);
            }

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

    private void onArchive(long id) {
        DB db = DB.getInstance(this);
        try {
            db.beginTransaction();

            EntityMessage message = db.message().getMessage(id);
            if (message != null) {
                EntityFolder archive = db.folder().getFolderByType(message.account, EntityFolder.ARCHIVE);
                if (archive == null)
                    archive = db.folder().getFolderByType(message.account, EntityFolder.TRASH);
                if (archive != null)
                    EntityOperation.queue(this, message, EntityOperation.MOVE, archive.id);
            }

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

    private void onFlag(long id) {
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        boolean threading = prefs.getBoolean("threading", true);

        DB db = DB.getInstance(this);
        try {
            db.beginTransaction();

            EntityMessage message = db.message().getMessage(id);
            if (message != null) {
                List<EntityMessage> messages = db.message().getMessageByThread(
                        message.account, message.thread, threading ? null : id, null);
                for (EntityMessage threaded : messages) {
                    EntityOperation.queue(this, threaded, EntityOperation.FLAG, true);
                    EntityOperation.queue(this, threaded, EntityOperation.SEEN, true);
                }
            }

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

    private void onSeen(long id) {
        DB db = DB.getInstance(this);
        try {
            db.beginTransaction();

            EntityMessage message = db.message().getMessage(id);
            if (message != null)
                EntityOperation.queue(this, message, EntityOperation.SEEN, true);

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

    private void onIgnore(long id) {
        DB db = DB.getInstance(this);
        try {
            db.beginTransaction();

            EntityMessage message = db.message().getMessage(id);
            if (message != null)
                db.message().setMessageUiIgnored(message.id, true);

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

    private void onSnooze(long id) {
        DB db = DB.getInstance(this);
        try {
            db.beginTransaction();

            EntityMessage message = db.message().getMessage(id);
            if (message != null) {
                db.message().setMessageSnoozed(message.id, null);

                EntityFolder folder = db.folder().getFolder(message.folder);
                if (EntityFolder.OUTBOX.equals(folder.type)) {
                    Log.i("Delayed send id=" + message.id);
                    EntityOperation.queue(
                            this, message, EntityOperation.SEND);
                } else if (folder.notify) {
                    EntityOperation.queue(
                            this, message, EntityOperation.SEEN, false);
                    db.message().setMessageUiIgnored(message.id, false);
                }
            }

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