Notification channels and categories

package com.example.myapp.utils

import android.app.NotificationChannel
import android.app.NotificationChannelGroup
import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.graphics.Color
import android.os.Build
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat
import com.example.myapp.R
import com.example.myapp.ui.MainActivity

class NotificationHelper(private val context: Context) {

    companion object {
        const val CHANNEL_ID_POSTS = "posts_channel"
        const val CHANNEL_ID_COMMENTS = "comments_channel"
        const val CHANNEL_ID_MESSAGES = "messages_channel"
        const val CHANNEL_GROUP_ID_SOCIAL = "social_group"
        const val NOTIFICATION_ID_POST = 1001
    }

    init {
        createNotificationChannels()
    }

    private fun createNotificationChannels() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE)
                as NotificationManager

            // Create channel group
            val group = NotificationChannelGroup(
                CHANNEL_GROUP_ID_SOCIAL,
                "Social"
            )
            notificationManager.createNotificationChannelGroup(group)

            // Posts channel - High importance
            val postsChannel = NotificationChannel(
                CHANNEL_ID_POSTS,
                "New Posts",
                NotificationManager.IMPORTANCE_HIGH
            ).apply {
                description = "Notifications for new posts from people you follow"
                enableLights(true)
                lightColor = Color.BLUE
                enableVibration(true)
                vibrationPattern = longArrayOf(0, 500, 200, 500)
                group = CHANNEL_GROUP_ID_SOCIAL
                setShowBadge(true)
            }

            // Comments channel - Default importance
            val commentsChannel = NotificationChannel(
                CHANNEL_ID_COMMENTS,
                "Comments",
                NotificationManager.IMPORTANCE_DEFAULT
            ).apply {
                description = "Notifications for comments on your posts"
                enableLights(true)
                lightColor = Color.GREEN
                group = CHANNEL_GROUP_ID_SOCIAL
            }

            // Messages channel - High importance
            val messagesChannel = NotificationChannel(
                CHANNEL_ID_MESSAGES,
                "Messages",
                NotificationManager.IMPORTANCE_HIGH
            ).apply {
                description = "Direct messages from other users"
                enableLights(true)
                lightColor = Color.RED
                enableVibration(true)
                group = CHANNEL_GROUP_ID_SOCIAL
                lockscreenVisibility = android.app.Notification.VISIBILITY_PRIVATE
            }

            notificationManager.createNotificationChannels(
                listOf(postsChannel, commentsChannel, messagesChannel)
            )
        }
    }

    fun showPostNotification(postId: Int, title: String, body: String) {
        val intent = Intent(context, MainActivity::class.java).apply {
            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
            putExtra("post_id", postId)
        }

        val pendingIntent = PendingIntent.getActivity(
            context,
            postId,
            intent,
            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
        )

        val notification = NotificationCompat.Builder(context, CHANNEL_ID_POSTS)
            .setSmallIcon(R.drawable.ic_notification)
            .setContentTitle(title)
            .setContentText(body)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setCategory(NotificationCompat.CATEGORY_SOCIAL)
            .build()

        NotificationManagerCompat.from(context).notify(NOTIFICATION_ID_POST + postId, notification)
    }

    fun showCommentNotification(postId: Int, commentText: String, commenterName: String) {
        val notification = NotificationCompat.Builder(context, CHANNEL_ID_COMMENTS)
            .setSmallIcon(R.drawable.ic_comment)
            .setContentTitle("$commenterName commented on your post")
            .setContentText(commentText)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setCategory(NotificationCompat.CATEGORY_SOCIAL)
            .build()

        NotificationManagerCompat.from(context).notify(postId, notification)
    }

    fun cancelNotification(notificationId: Int) {
        NotificationManagerCompat.from(context).cancel(notificationId)
    }

    fun cancelAllNotifications() {
        NotificationManagerCompat.from(context).cancelAll()
    }
}