ntfy-android/app/src/main/java/io/heckel/ntfy/msg/NotificationService.kt

package io.heckel.ntfy.msg

import android.app.*
import android.content.*
import android.graphics.BitmapFactory
import android.media.RingtoneManager
import android.net.Uri
import android.os.Build
import android.util.Log
import androidx.core.app.NotificationCompat
import androidx.core.content.ContextCompat
import io.heckel.ntfy.R
import io.heckel.ntfy.data.Notification
import io.heckel.ntfy.data.Subscription
import io.heckel.ntfy.ui.DetailActivity
import io.heckel.ntfy.ui.MainActivity
import io.heckel.ntfy.util.formatBytes
import io.heckel.ntfy.util.formatDateShort
import io.heckel.ntfy.util.formatMessage
import io.heckel.ntfy.util.formatTitle

class NotificationService(val context: Context) {
    private val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

    fun display(subscription: Subscription, notification: Notification) {
        Log.d(TAG, "Displaying notification $notification")
        displayInternal(subscription, notification)
    }

    fun update(subscription: Subscription, notification: Notification, progress: Int = PROGRESS_NONE) {
        Log.d(TAG, "Updating notification $notification")
        displayInternal(subscription, notification, update = true, progress = progress)
    }

    fun cancel(notification: Notification) {
        if (notification.notificationId != 0) {
            Log.d(TAG, "Cancelling notification ${notification.id}: ${notification.message}")
            val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            notificationManager.cancel(notification.notificationId)
        }
    }

    fun createNotificationChannels() {
        (1..5).forEach { priority -> maybeCreateNotificationChannel(priority) }
    }

    private fun displayInternal(subscription: Subscription, notification: Notification, update: Boolean = false, progress: Int = PROGRESS_NONE) {
        val title = formatTitle(subscription, notification)
        val message = maybeWithAttachmentInfo(formatMessage(notification), notification, progress)
        val channelId = toChannelId(notification.priority)
        val builder = NotificationCompat.Builder(context, channelId)
            .setSmallIcon(R.drawable.ic_notification)
            .setColor(ContextCompat.getColor(context, R.color.primaryColor))
            .setContentTitle(title)
            .setContentText(message)
            .setOnlyAlertOnce(true) // Do not vibrate or play sound if already showing (updates!)
            .setAutoCancel(true) // Cancel when notification is clicked
        setStyle(builder, notification, message) // Preview picture or big text style
        setContentIntent(builder, subscription, notification)
        maybeSetSound(builder, update)
        maybeSetProgress(builder, progress)
        maybeAddOpenAction(builder, notification)
        maybeAddBrowseAction(builder, notification)

        maybeCreateNotificationChannel(notification.priority)
        notificationManager.notify(notification.notificationId, builder.build())
    }

    private fun maybeWithAttachmentInfo(message: String, notification: Notification, progress: Int): String {
        if (progress < 0 || notification.attachment == null) return message
        val att = notification.attachment
        val infos = mutableListOf<String>()
        if (att.name != null) infos.add(att.name)
        if (att.size != null) infos.add(formatBytes(att.size))
        //if (att.expires != null && att.expires != 0L) infos.add(formatDateShort(att.expires))
        if (progress >= 0) infos.add("${progress}%")
        if (infos.size == 0) return message
        if (progress < 100) return "Downloading ${infos.joinToString(", ")}\n${message}"
        return "${message}\nFile: ${infos.joinToString(", ")}"
    }

    private fun maybeSetSound(builder: NotificationCompat.Builder, update: Boolean) {
        if (!update) {
            val defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
            builder.setSound(defaultSoundUri)
        } else {
            builder.setSound(null)
        }
    }

    private fun setStyle(builder: NotificationCompat.Builder, notification: Notification, message: String) {
        val contentUri = notification.attachment?.contentUri
        val isImage = listOf("image/jpeg", "image/png").contains(notification.attachment?.type)
        if (contentUri != null && isImage) {
            try {
                val resolver = context.applicationContext.contentResolver
                val bitmapStream = resolver.openInputStream(Uri.parse(contentUri))
                val bitmap = BitmapFactory.decodeStream(bitmapStream)
                builder
                    .setLargeIcon(bitmap)
                    .setStyle(NotificationCompat.BigPictureStyle()
                        .bigPicture(bitmap)
                        .bigLargeIcon(null))
            } catch (_: Exception) {
                builder.setStyle(NotificationCompat.BigTextStyle().bigText(message))
            }
        } else {
            builder.setStyle(NotificationCompat.BigTextStyle().bigText(message))
        }
    }

    private fun setContentIntent(builder: NotificationCompat.Builder, subscription: Subscription, notification: Notification) {
        if (notification.click == "") {
            builder.setContentIntent(detailActivityIntent(subscription))
        } else {
            try {
                val uri = Uri.parse(notification.click)
                val viewIntent = PendingIntent.getActivity(context, 0, Intent(Intent.ACTION_VIEW, uri), 0)
                builder.setContentIntent(viewIntent)
            } catch (e: Exception) {
                builder.setContentIntent(detailActivityIntent(subscription))
            }
        }
    }

    private fun maybeSetProgress(builder: NotificationCompat.Builder, progress: Int) {
        if (progress in 0..99) {
            builder.setProgress(100, progress, false)
        } else {
            builder.setProgress(0, 0, false) // Remove progress bar
        }
    }

    private fun maybeAddOpenAction(builder: NotificationCompat.Builder, notification: Notification) {
        if (notification.attachment?.contentUri != null) {
            val contentUri = Uri.parse(notification.attachment.contentUri)
            val intent = Intent(Intent.ACTION_VIEW, contentUri)
            val pendingIntent = PendingIntent.getActivity(context, 0, intent, 0)
            builder.addAction(NotificationCompat.Action.Builder(0, context.getString(R.string.notification_popup_action_open), pendingIntent).build())
        }
    }

    private fun maybeAddBrowseAction(builder: NotificationCompat.Builder, notification: Notification) {
        if (notification.attachment?.contentUri != null) {
            val intent = Intent(DownloadManager.ACTION_VIEW_DOWNLOADS)
            val pendingIntent = PendingIntent.getActivity(context, 0, intent, 0)
            builder.addAction(NotificationCompat.Action.Builder(0, context.getString(R.string.notification_popup_action_browse), pendingIntent).build())
        }
    }

    private fun detailActivityIntent(subscription: Subscription): PendingIntent? {
        val intent = Intent(context, DetailActivity::class.java)
        intent.putExtra(MainActivity.EXTRA_SUBSCRIPTION_ID, subscription.id)
        intent.putExtra(MainActivity.EXTRA_SUBSCRIPTION_BASE_URL, subscription.baseUrl)
        intent.putExtra(MainActivity.EXTRA_SUBSCRIPTION_TOPIC, subscription.topic)
        intent.putExtra(MainActivity.EXTRA_SUBSCRIPTION_INSTANT, subscription.instant)
        intent.putExtra(MainActivity.EXTRA_SUBSCRIPTION_MUTED_UNTIL, subscription.mutedUntil)
        return TaskStackBuilder.create(context).run {
            addNextIntentWithParentStack(intent) // Add the intent, which inflates the back stack
            getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT) // Get the PendingIntent containing the entire back stack
        }
    }

    private fun maybeCreateNotificationChannel(priority: Int) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            // Note: To change a notification channel, you must delete the old one and create a new one!

            val pause = 300L
            val channel = when (priority) {
                1 -> NotificationChannel(CHANNEL_ID_MIN, context.getString(R.string.channel_notifications_min_name), NotificationManager.IMPORTANCE_MIN)
                2 -> NotificationChannel(CHANNEL_ID_LOW, context.getString(R.string.channel_notifications_low_name), NotificationManager.IMPORTANCE_LOW)
                4 -> {
                    val channel = NotificationChannel(CHANNEL_ID_HIGH, context.getString(R.string.channel_notifications_high_name), NotificationManager.IMPORTANCE_HIGH)
                    channel.enableVibration(true)
                    channel.vibrationPattern = longArrayOf(
                        pause, 100, pause, 100, pause, 100,
                        pause, 2000
                    )
                    channel
                }
                5 -> {
                    val channel = NotificationChannel(CHANNEL_ID_MAX, context.getString(R.string.channel_notifications_max_name), NotificationManager.IMPORTANCE_MAX)
                    channel.enableLights(true)
                    channel.enableVibration(true)
                    channel.vibrationPattern = longArrayOf(
                        pause, 100, pause, 100, pause, 100,
                        pause, 2000,
                        pause, 100, pause, 100, pause, 100,
                        pause, 2000,
                        pause, 100, pause, 100, pause, 100,
                        pause, 2000
                    )
                    channel
                }
                else -> NotificationChannel(CHANNEL_ID_DEFAULT, context.getString(R.string.channel_notifications_default_name), NotificationManager.IMPORTANCE_DEFAULT)
            }
            notificationManager.createNotificationChannel(channel)
        }
    }

    private fun toChannelId(priority: Int): String {
        return when (priority) {
            1 -> CHANNEL_ID_MIN
            2 -> CHANNEL_ID_LOW
            4 -> CHANNEL_ID_HIGH
            5 -> CHANNEL_ID_MAX
            else -> CHANNEL_ID_DEFAULT
        }
    }

    companion object {
        const val PROGRESS_NONE = -1
        const val PROGRESS_INDETERMINATE = -2
        const val PROGRESS_DONE = 100

        private const val TAG = "NtfyNotifService"

        private const val CHANNEL_ID_MIN = "ntfy-min"
        private const val CHANNEL_ID_LOW = "ntfy-low"
        private const val CHANNEL_ID_DEFAULT = "ntfy"
        private const val CHANNEL_ID_HIGH = "ntfy-high"
        private const val CHANNEL_ID_MAX = "ntfy-max"
    }
}