/*
 * Nextcloud Talk application
 *
 * @author Mario Danic
 * @author Andy Scherzinger
 * Copyright (C) 2021 Andy Scherzinger <info@andy-scherzinger.de>
 * Copyright (C) 2017 Mario Danic <mario@lovelyhq.com>
 *
 * This program 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.nextcloud.talk.utils

import android.annotation.TargetApi
import android.app.Notification
import android.app.NotificationChannel
import android.app.NotificationManager
import android.content.Context
import android.graphics.drawable.BitmapDrawable
import android.media.AudioAttributes
import android.net.Uri
import android.os.Build
import android.service.notification.StatusBarNotification
import android.text.TextUtils
import android.util.Log
import androidx.core.app.NotificationManagerCompat
import androidx.core.graphics.drawable.IconCompat
import coil.executeBlocking
import coil.imageLoader
import coil.request.ImageRequest
import coil.transform.CircleCropTransformation
import com.bluelinelabs.logansquare.LoganSquare
import com.nextcloud.talk.BuildConfig
import com.nextcloud.talk.R
import com.nextcloud.talk.data.user.model.User
import com.nextcloud.talk.models.RingtoneSettings
import com.nextcloud.talk.utils.bundle.BundleKeys
import com.nextcloud.talk.utils.preferences.AppPreferences
import java.io.IOException

@Suppress("TooManyFunctions")
object NotificationUtils {

    const val TAG = "NotificationUtils"

    enum class NotificationChannels {
        NOTIFICATION_CHANNEL_MESSAGES_V4,
        NOTIFICATION_CHANNEL_CALLS_V4,
        NOTIFICATION_CHANNEL_UPLOADS
    }

    const val DEFAULT_CALL_RINGTONE_URI =
        "android.resource://" + BuildConfig.APPLICATION_ID + "/raw/librem_by_feandesign_call"
    const val DEFAULT_MESSAGE_RINGTONE_URI =
        "android.resource://" + BuildConfig.APPLICATION_ID + "/raw/librem_by_feandesign_message"

    // RemoteInput key - used for replies sent directly from notification
    const val KEY_DIRECT_REPLY = "key_direct_reply"

    // notification group keys
    const val KEY_UPLOAD_GROUP = "com.nextcloud.talk.utils.KEY_UPLOAD_GROUP"
    const val GROUP_SUMMARY_NOTIFICATION_ID = -1

    @TargetApi(Build.VERSION_CODES.O)
    private fun createNotificationChannel(
        context: Context,
        notificationChannel: Channel,
        sound: Uri?,
        audioAttributes: AudioAttributes?
    ) {
        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        if (
            Build.VERSION.SDK_INT >= Build.VERSION_CODES.O &&
            notificationManager.getNotificationChannel(notificationChannel.id) == null
        ) {
            val importance = if (notificationChannel.isImportant) {
                NotificationManager.IMPORTANCE_HIGH
            } else {
                NotificationManager.IMPORTANCE_LOW
            }

            val channel = NotificationChannel(
                notificationChannel.id,
                notificationChannel.name,
                importance
            )

            channel.description = notificationChannel.description
            channel.enableLights(true)
            channel.lightColor = R.color.colorPrimary
            channel.setSound(sound, audioAttributes)
            channel.setBypassDnd(false)

            notificationManager.createNotificationChannel(channel)
        }
    }

    private fun createCallsNotificationChannel(context: Context, appPreferences: AppPreferences) {
        val audioAttributes =
            AudioAttributes.Builder()
                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                .setUsage(AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_REQUEST)
                .build()
        val soundUri = getCallRingtoneUri(context, appPreferences)

        createNotificationChannel(
            context,
            Channel(
                NotificationChannels.NOTIFICATION_CHANNEL_CALLS_V4.name,
                context.resources.getString(R.string.nc_notification_channel_calls),
                context.resources.getString(R.string.nc_notification_channel_calls_description),
                true
            ),
            soundUri,
            audioAttributes
        )
    }

    private fun createMessagesNotificationChannel(context: Context, appPreferences: AppPreferences) {
        val audioAttributes =
            AudioAttributes.Builder()
                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                .setUsage(AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_INSTANT)
                .build()
        val soundUri = getMessageRingtoneUri(context, appPreferences)

        createNotificationChannel(
            context,
            Channel(
                NotificationChannels.NOTIFICATION_CHANNEL_MESSAGES_V4.name,
                context.resources.getString(R.string.nc_notification_channel_messages),
                context.resources.getString(R.string.nc_notification_channel_messages_description),
                true
            ),
            soundUri,
            audioAttributes
        )
    }

    private fun createUploadsNotificationChannel(context: Context) {
        createNotificationChannel(
            context,
            Channel(
                NotificationChannels.NOTIFICATION_CHANNEL_UPLOADS.name,
                context.resources.getString(R.string.nc_notification_channel_uploads),
                context.resources.getString(R.string.nc_notification_channel_uploads_description),
                false
            ),
            null,
            null
        )
    }

    fun registerNotificationChannels(context: Context, appPreferences: AppPreferences) {
        createCallsNotificationChannel(context, appPreferences)
        createMessagesNotificationChannel(context, appPreferences)
        createUploadsNotificationChannel(context)
    }

    @TargetApi(Build.VERSION_CODES.O)
    fun removeOldNotificationChannels(context: Context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

            // Current version does not use notification channel groups - delete all groups
            for (channelGroup in notificationManager.notificationChannelGroups) {
                notificationManager.deleteNotificationChannelGroup(channelGroup.id)
            }

            val channelsToKeep = NotificationChannels.values().map { it.name }

            // Delete all notification channels created by previous versions
            for (channel in notificationManager.notificationChannels) {
                if (!channelsToKeep.contains(channel.id)) {
                    notificationManager.deleteNotificationChannel(channel.id)
                }
            }
        }
    }

    @TargetApi(Build.VERSION_CODES.O)
    private fun getNotificationChannel(context: Context, channelId: String): NotificationChannel? {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            return notificationManager.getNotificationChannel(channelId)
        }
        return null
    }

    private inline fun scanNotifications(
        context: Context?,
        conversationUser: User,
        callback: (
            notificationManager: NotificationManager,
            statusBarNotification: StatusBarNotification,
            notification: Notification
        ) -> Unit
    ) {
        if (conversationUser.id == -1L || context == null) {
            return
        }

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

        val statusBarNotifications = notificationManager.activeNotifications
        var notification: Notification?
        for (statusBarNotification in statusBarNotifications) {
            notification = statusBarNotification.notification

            if (
                notification != null &&
                !notification.extras.isEmpty &&
                conversationUser.id == notification.extras.getLong(BundleKeys.KEY_INTERNAL_USER_ID)
            ) {
                callback(notificationManager, statusBarNotification, notification)
            }
        }
    }

    fun cancelAllNotificationsForAccount(context: Context?, conversationUser: User) {
        scanNotifications(context, conversationUser) { notificationManager, statusBarNotification, _ ->
            notificationManager.cancel(statusBarNotification.id)
        }
    }

    fun cancelNotification(context: Context?, conversationUser: User, notificationId: Long?) {
        scanNotifications(context, conversationUser) { notificationManager, statusBarNotification, notification ->
            if (notificationId == notification.extras.getLong(BundleKeys.KEY_NOTIFICATION_ID)) {
                notificationManager.cancel(statusBarNotification.id)
            }
        }
    }

    fun findNotificationForRoom(
        context: Context?,
        conversationUser: User,
        roomTokenOrId: String
    ): StatusBarNotification? {
        scanNotifications(context, conversationUser) { _, statusBarNotification, notification ->
            if (roomTokenOrId == notification.extras.getString(BundleKeys.KEY_ROOM_TOKEN)) {
                return statusBarNotification
            }
        }
        return null
    }

    fun cancelExistingNotificationsForRoom(context: Context?, conversationUser: User, roomTokenOrId: String) {
        scanNotifications(context, conversationUser) { notificationManager, statusBarNotification, notification ->
            if (roomTokenOrId == notification.extras.getString(BundleKeys.KEY_ROOM_TOKEN) &&
                !notification.extras.getBoolean(BundleKeys.KEY_NOTIFICATION_RESTRICT_DELETION)
            ) {
                notificationManager.cancel(statusBarNotification.id)
            }
        }
    }

    fun isNotificationVisible(context: Context?, notificationId: Int): Boolean {
        var isVisible = false

        val notificationManager = context!!.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        val notifications = notificationManager.activeNotifications
        for (notification in notifications) {
            if (notification.id == notificationId) {
                isVisible = true
                break
            }
        }
        return isVisible
    }

    fun isCallsNotificationChannelEnabled(context: Context): Boolean {
        val channel = getNotificationChannel(context, NotificationChannels.NOTIFICATION_CHANNEL_CALLS_V4.name)
        if (channel != null) {
            return isNotificationChannelEnabled(context, channel)
        }
        return false
    }

    fun isMessagesNotificationChannelEnabled(context: Context): Boolean {
        val channel = getNotificationChannel(context, NotificationChannels.NOTIFICATION_CHANNEL_MESSAGES_V4.name)
        if (channel != null) {
            return isNotificationChannelEnabled(context, channel)
        }
        return false
    }

    private fun isNotificationChannelEnabled(context: Context, channel: NotificationChannel): Boolean {
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            channel.importance != NotificationManager.IMPORTANCE_NONE
        } else {
            NotificationManagerCompat.from(context).areNotificationsEnabled()
        }
    }

    private fun getRingtoneUri(
        context: Context,
        ringtonePreferencesString: String?,
        defaultRingtoneUri: String,
        channelId: String
    ): Uri? {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = getNotificationChannel(context, channelId)
            if (channel != null) {
                return channel.sound
            }
            // Notification channel will not be available when starting the application for the first time.
            // Ringtone uris are required to register the notification channels -> get uri from preferences.
        }
        return if (TextUtils.isEmpty(ringtonePreferencesString)) {
            Uri.parse(defaultRingtoneUri)
        } else {
            try {
                val ringtoneSettings =
                    LoganSquare.parse(ringtonePreferencesString, RingtoneSettings::class.java)
                ringtoneSettings.ringtoneUri
            } catch (exception: IOException) {
                Uri.parse(defaultRingtoneUri)
            }
        }
    }

    fun getCallRingtoneUri(context: Context, appPreferences: AppPreferences): Uri? {
        return getRingtoneUri(
            context,
            appPreferences.callRingtoneUri,
            DEFAULT_CALL_RINGTONE_URI,
            NotificationChannels.NOTIFICATION_CHANNEL_CALLS_V4.name
        )
    }

    fun getMessageRingtoneUri(context: Context, appPreferences: AppPreferences): Uri? {
        return getRingtoneUri(
            context,
            appPreferences.messageRingtoneUri,
            DEFAULT_MESSAGE_RINGTONE_URI,
            NotificationChannels.NOTIFICATION_CHANNEL_MESSAGES_V4.name
        )
    }

    fun loadAvatarSync(avatarUrl: String, context: Context): IconCompat? {
        var avatarIcon: IconCompat? = null

        val request = ImageRequest.Builder(context)
            .data(avatarUrl)
            .transformations(CircleCropTransformation())
            .placeholder(R.drawable.account_circle_96dp)
            .target(
                onSuccess = { result ->
                    val bitmap = (result as BitmapDrawable).bitmap
                    avatarIcon = IconCompat.createWithBitmap(bitmap)
                },
                onError = { error ->
                    error?.let {
                        val bitmap = (error as BitmapDrawable).bitmap
                        avatarIcon = IconCompat.createWithBitmap(bitmap)
                    }
                    Log.w(TAG, "Can't load avatar for URL: $avatarUrl")
                }
            )
            .build()

        context.imageLoader.executeBlocking(request)

        return avatarIcon
    }

    private data class Channel(
        val id: String,
        val name: String,
        val description: String,
        val isImportant: Boolean
    )
}