Service and foreground notifications

package com.example.myapp.services

import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.PendingIntent
import android.app.Service
import android.content.Context
import android.content.Intent
import android.os.Build
import android.os.IBinder
import androidx.core.app.NotificationCompat
import com.example.myapp.R
import com.example.myapp.ui.MainActivity
import kotlinx.coroutines.*
import java.io.File

class UploadService : Service() {

    private val serviceScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
    private val notificationId = 2001

    companion object {
        private const val CHANNEL_ID = "upload_channel"
        const val ACTION_START_UPLOAD = "action_start_upload"
        const val ACTION_CANCEL_UPLOAD = "action_cancel_upload"
        const val EXTRA_FILE_PATH = "extra_file_path"

        fun startUpload(context: Context, filePath: String) {
            val intent = Intent(context, UploadService::class.java).apply {
                action = ACTION_START_UPLOAD
                putExtra(EXTRA_FILE_PATH, filePath)
            }
            context.startService(intent)
        }
    }

    override fun onCreate() {
        super.onCreate()
        createNotificationChannel()
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        when (intent?.action) {
            ACTION_START_UPLOAD -> {
                val filePath = intent.getStringExtra(EXTRA_FILE_PATH)
                filePath?.let { startUpload(it) }
            }
            ACTION_CANCEL_UPLOAD -> {
                stopSelf()
            }
        }
        return START_NOT_STICKY
    }

    private fun startUpload(filePath: String) {
        val notification = createNotification("Uploading...", 0)
        startForeground(notificationId, notification)

        serviceScope.launch {
            try {
                val file = File(filePath)
                uploadFile(file) { progress ->
                    updateNotification("Uploading...", progress)
                }

                updateNotification("Upload complete", 100)
                delay(2000)
                stopForeground(true)
                stopSelf()
            } catch (e: Exception) {
                updateNotification("Upload failed", 0)
                delay(2000)
                stopForeground(true)
                stopSelf()
            }
        }
    }

    private suspend fun uploadFile(file: File, onProgress: (Int) -> Unit) {
        // Simulate upload progress
        for (i in 0..100 step 10) {
            delay(500)
            onProgress(i)
        }
    }

    private fun createNotification(title: String, progress: Int): android.app.Notification {
        val intent = Intent(this, MainActivity::class.java)
        val pendingIntent = PendingIntent.getActivity(
            this,
            0,
            intent,
            PendingIntent.FLAG_IMMUTABLE
        )

        val cancelIntent = Intent(this, UploadService::class.java).apply {
            action = ACTION_CANCEL_UPLOAD
        }
        val cancelPendingIntent = PendingIntent.getService(
            this,
            0,
            cancelIntent,
            PendingIntent.FLAG_IMMUTABLE
        )

        return NotificationCompat.Builder(this, CHANNEL_ID)
            .setContentTitle(title)
            .setSmallIcon(R.drawable.ic_upload)
            .setProgress(100, progress, progress == 0)
            .setContentIntent(pendingIntent)
            .addAction(R.drawable.ic_cancel, "Cancel", cancelPendingIntent)
            .setOngoing(true)
            .build()
    }

    private fun updateNotification(title: String, progress: Int) {
        val notification = createNotification(title, progress)
        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE)
            as NotificationManager
        notificationManager.notify(notificationId, notification)
    }

    private fun createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = NotificationChannel(
                CHANNEL_ID,
                "File Uploads",
                NotificationManager.IMPORTANCE_LOW
            ).apply {
                description = "Shows progress of file uploads"
            }

            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE)
                as NotificationManager
            notificationManager.createNotificationChannel(channel)
        }
    }

    override fun onBind(intent: Intent?): IBinder? = null

    override fun onDestroy() {
        super.onDestroy()
        serviceScope.cancel()
    }
}