/*
 * Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
 *
 * This file is part of QKSMS.
 *
 * QKSMS 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.
 *
 * QKSMS 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 QKSMS.  If not, see <http://www.gnu.org/licenses/>.
 */
package common.util

import android.annotation.SuppressLint
import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.graphics.Color
import android.net.Uri
import android.os.Build
import android.support.v4.app.NotificationCompat
import android.support.v4.app.NotificationManagerCompat
import android.support.v4.app.RemoteInput
import android.support.v4.app.TaskStackBuilder
import com.moez.QKSMS.R
import feature.compose.ComposeActivity
import feature.qkreply.QkReplyActivity
import receiver.MarkReadReceiver
import receiver.MarkSeenReceiver
import receiver.RemoteMessagingReceiver
import repository.MessageRepository
import util.Preferences
import javax.inject.Inject
import javax.inject.Singleton

@Singleton
class NotificationManagerImpl @Inject constructor(
        private val context: Context,
        private val prefs: Preferences,
        private val colors: Colors,
        private val messageRepo: MessageRepository
) : manager.NotificationManager {

    companion object {
        const val DEFAULT_CHANNEL_ID = "notifications_default"
        val VIBRATE_PATTERN = longArrayOf(0, 200, 0, 200)
    }

    private val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

    init {
        @SuppressLint("NewApi")
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val name = "Default"
            val importance = NotificationManager.IMPORTANCE_HIGH
            val channel = NotificationChannel(DEFAULT_CHANNEL_ID, name, importance).apply {
                enableLights(true)
                lightColor = Color.WHITE
                enableVibration(true)
                vibrationPattern = VIBRATE_PATTERN
            }

            notificationManager.createNotificationChannel(channel)
        }
    }

    /**
     * Updates the notification for a particular conversation
     */
    override fun update(threadId: Long) {
        // If notifications are disabled, don't do anything
        if (!prefs.notifications(threadId).get()) {
            return
        }

        val messages = messageRepo.getUnreadUnseenMessages(threadId)

        // If there are no messages to be displayed, make sure that the notification is dismissed
        if (messages.isEmpty()) {
            notificationManager.cancel(threadId.toInt())
            return
        }

        val conversation = messageRepo.getConversation(threadId) ?: return

        // If QK Reply is enabled, use the default importance so that we don't have a notification
        // card in addition to the popup. Otherwise, use max importance
        val importance = when (prefs.qkreply.get()) {
            true -> NotificationManagerCompat.IMPORTANCE_DEFAULT
            false -> NotificationManagerCompat.IMPORTANCE_MAX
        }

        val style = NotificationCompat.MessagingStyle("Me")
        messages.forEach { message ->
            val name = if (message.isMe()) null else conversation.getTitle()
            style.addMessage(message.getSummary(), message.date, name)
        }

        val contentIntent = Intent(context, ComposeActivity::class.java).putExtra("threadId", threadId)
        val taskStackBuilder = TaskStackBuilder.create(context)
        taskStackBuilder.addParentStack(ComposeActivity::class.java)
        taskStackBuilder.addNextIntent(contentIntent)
        val contentPI = taskStackBuilder.getPendingIntent(threadId.toInt() + 10000, PendingIntent.FLAG_UPDATE_CURRENT)

        val seenIntent = Intent(context, MarkSeenReceiver::class.java).putExtra("threadId", threadId)
        val seenPI = PendingIntent.getBroadcast(context, threadId.toInt() + 20000, seenIntent, PendingIntent.FLAG_UPDATE_CURRENT)

        val readIntent = Intent(context, MarkReadReceiver::class.java).putExtra("threadId", threadId)
        val readPI = PendingIntent.getBroadcast(context, threadId.toInt() + 30000, readIntent, PendingIntent.FLAG_UPDATE_CURRENT)
        val readAction = NotificationCompat.Action(R.drawable.ic_done_black_24dp, context.getString(R.string.notification_read), readPI)

        val notification = NotificationCompat.Builder(context, getChannelIdForNotification(threadId))
                .setColor(colors.themeForConversation(threadId).blockingFirst())
                .setPriority(importance)
                .setSmallIcon(R.drawable.ic_notification)
                .setNumber(messages.size)
                .setAutoCancel(true)
                .setContentIntent(contentPI)
                .setDeleteIntent(seenPI)
                .addAction(readAction)
                .setStyle(style)
                .setSound(Uri.parse(prefs.ringtone(threadId).get()))
                .setLights(Color.WHITE, 500, 2000)
                .setVibrate(if (prefs.vibration(threadId).get()) VIBRATE_PATTERN else longArrayOf(0))

        if (Build.VERSION.SDK_INT >= 24) {
            notification.addAction(getReplyAction(conversation.recipients[0]?.address.orEmpty(), threadId))
        }

        if (prefs.qkreply.get()) {
            val intent = Intent(context, QkReplyActivity::class.java)
                    .putExtra("threadId", threadId)
                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)

            context.startActivity(intent)
        }

        notificationManager.notify(threadId.toInt(), notification.build())
    }

    override fun notifyFailed(msgId: Long) {
        val message = messageRepo.getMessage(msgId)

        if (message == null || !message.isFailedMessage()) {
            return
        }

        val conversation = message.conversation ?: return
        val threadId = conversation.id

        val contentIntent = Intent(context, ComposeActivity::class.java).putExtra("threadId", threadId)
        val taskStackBuilder = TaskStackBuilder.create(context)
        taskStackBuilder.addParentStack(ComposeActivity::class.java)
        taskStackBuilder.addNextIntent(contentIntent)
        val contentPI = taskStackBuilder.getPendingIntent(threadId.toInt() + 40000, PendingIntent.FLAG_UPDATE_CURRENT)

        val notification = NotificationCompat.Builder(context, getChannelIdForNotification(threadId))
                .setContentTitle(context.getString(R.string.notification_message_failed_title))
                .setContentText(context.getString(R.string.notification_message_failed_text, conversation.getTitle()))
                .setColor(colors.themeForConversation(threadId).blockingFirst())
                .setPriority(NotificationManagerCompat.IMPORTANCE_MAX)
                .setSmallIcon(R.drawable.ic_notification_failed)
                .setAutoCancel(true)
                .setContentIntent(contentPI)
                .setSound(Uri.parse(prefs.ringtone(threadId).get()))
                .setLights(Color.WHITE, 500, 2000)
                .setVibrate(if (prefs.vibration(threadId).get()) VIBRATE_PATTERN else longArrayOf(0))

        notificationManager.notify(threadId.toInt() + 50000, notification.build())
    }

    private fun getReplyAction(address: String, threadId: Long): NotificationCompat.Action {
        val replyIntent = Intent(context, RemoteMessagingReceiver::class.java)
                .putExtra("address", address)
                .putExtra("threadId", threadId)
        val replyPI = PendingIntent.getBroadcast(context, threadId.toInt() + 40000, replyIntent, PendingIntent.FLAG_UPDATE_CURRENT)

        val responseSet = arrayListOf("Hello", "Hey").toTypedArray().sortedArray()
        val remoteInput = RemoteInput.Builder("body")
                .setLabel(context.getString(R.string.notification_reply))
                .setChoices(responseSet)
                .build()

        return NotificationCompat.Action.Builder(
                R.drawable.ic_reply_black_24dp,
                context.getString(R.string.notification_reply), replyPI)
                .addRemoteInput(remoteInput)
                .build()
    }

    /**
     * Creates a notification channel for the given conversation
     */
    override fun createNotificationChannel(threadId: Long) {

        // Only proceed if the android version supports notification channels
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) return

        messageRepo.getConversation(threadId)?.let { conversation ->
            val channelId = buildNotificationChannelId(threadId)
            val name = conversation.getTitle()
            val importance = NotificationManager.IMPORTANCE_HIGH
            val channel = NotificationChannel(channelId, name, importance).apply {
                enableLights(true)
                lightColor = Color.WHITE
                enableVibration(true)
                vibrationPattern = VIBRATE_PATTERN
            }

            notificationManager.createNotificationChannel(channel)
        }
    }

    /**
     * Returns the notification channel for the given conversation, or null if it doesn't exist
     */
    private fun getNotificationChannel(threadId: Long): NotificationChannel? {
        val channelId = buildNotificationChannelId(threadId)

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            return notificationManager
                    .notificationChannels
                    .firstOrNull { channel -> channel.id == channelId }
        }

        return null
    }

    /**
     * Returns the channel id that should be used for a notification based on the threadId
     *
     * If a notification channel for the conversation exists, use the id for that. Otherwise return
     * the default channel id
     */
    private fun getChannelIdForNotification(threadId: Long): String {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channelId = buildNotificationChannelId(threadId)

            return notificationManager
                    .notificationChannels
                    .map { channel -> channel.id }
                    .firstOrNull { id -> id == channelId }
                    ?: DEFAULT_CHANNEL_ID
        }

        return DEFAULT_CHANNEL_ID
    }

    /**
     * Formats a notification channel id for a given thread id, whether the channel exists or not
     */
    override fun buildNotificationChannelId(threadId: Long): String {
        return when (threadId) {
            0L -> DEFAULT_CHANNEL_ID
            else -> "notifications_$threadId"
        }
    }

}