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

package io.heckel.ntfy.msg

import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.app.TaskStackBuilder
import android.content.Context
import android.content.Intent
import android.graphics.Bitmap
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 androidx.work.OneTimeWorkRequest
import androidx.work.WorkManager
import androidx.work.workDataOf
import io.heckel.ntfy.R
import io.heckel.ntfy.data.Notification
import io.heckel.ntfy.data.Repository
import io.heckel.ntfy.data.Subscription
import io.heckel.ntfy.ui.DetailActivity
import io.heckel.ntfy.ui.MainActivity
import io.heckel.ntfy.util.formatMessage
import io.heckel.ntfy.util.formatTitle
import java.io.File

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")

        // Display notification immediately
        displayInternal(subscription, notification)

        // Download attachment (+ preview if available) in the background via WorkManager
        // The indirection via WorkManager is required since this code may be executed
        // in a doze state and Internet may not be available. It's also best practice apparently.
        if (notification.attachmentUrl != null) {
            scheduleAttachmentDownload(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 = formatMessage(notification)
        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)
        maybeAddCopyUrlAction(builder, notification)

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

    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 previewFile = File(context.applicationContext.cacheDir.absolutePath, "preview-" + notification.id)
        if (previewFile.exists()) {
            try {
                val bitmap = BitmapFactory.decodeFile(previewFile.absolutePath)
                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 >= 0) {
            builder.setProgress(100, progress, false)
        } else {
            builder.setProgress(0, 0, false) // Remove progress bar
        }
    }

    private fun maybeAddOpenAction(notificationBuilder: NotificationCompat.Builder, notification: Notification) {
        if (notification.attachmentContentUri != null) {
            val contentUri = Uri.parse(notification.attachmentContentUri)
            val openIntent = PendingIntent.getActivity(context, 0, Intent(Intent.ACTION_VIEW, contentUri), 0)
            notificationBuilder.addAction(NotificationCompat.Action.Builder(0, "Open", openIntent).build())
        }
    }

    private fun maybeAddCopyUrlAction(builder: NotificationCompat.Builder, notification: Notification) {
        if (notification.attachmentUrl != null) {
            // XXXXXXXXx
            val copyUrlIntent = PendingIntent.getActivity(context, 0, Intent(Intent.ACTION_VIEW, Uri.parse(notification.attachmentUrl)), 0)
            builder.addAction(NotificationCompat.Action.Builder(0, "Copy URL", copyUrlIntent).build())
        }
    }

    private fun scheduleAttachmentDownload(subscription: Subscription, notification: Notification) {
        Log.d(TAG, "Enqueuing work to download attachment (+ preview if available)")
        val workManager = WorkManager.getInstance(context)
        val workRequest = OneTimeWorkRequest.Builder(AttachmentDownloadWorker::class.java)
            .setInputData(workDataOf(
                "id" to notification.id,
            ))
            .build()
        workManager.enqueue(workRequest)
    }

    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

        private const val TAG = "NtfyNotificationService"
        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"
    }
}