Deep linking and App Links

package com.example.myapp.ui

import android.content.Intent
import android.net.Uri
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.fragment.NavHostFragment
import com.example.myapp.R
import com.example.myapp.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        handleDeepLink(intent)
    }

    override fun onNewIntent(intent: Intent?) {
        super.onNewIntent(intent)
        intent?.let { handleDeepLink(it) }
    }

    private fun handleDeepLink(intent: Intent) {
        val action = intent.action
        val data: Uri? = intent.data

        when {
            action == Intent.ACTION_VIEW && data != null -> {
                // Handle deep link
                val postId = data.lastPathSegment?.toIntOrNull()
                val query = data.getQueryParameter("q")

                when (data.host) {
                    "myapp.com" -> handleWebDeepLink(data, postId, query)
                    "app" -> handleCustomSchemeDeepLink(data, postId)
                }
            }
            intent.hasExtra("post_id") -> {
                // Handle notification click
                val postId = intent.getIntExtra("post_id", -1)
                if (postId != -1) {
                    navigateToPost(postId)
                }
            }
        }
    }

    private fun handleWebDeepLink(uri: Uri, postId: Int?, query: String?) {
        when {
            uri.path?.startsWith("/posts/") == true && postId != null -> {
                navigateToPost(postId)
            }
            uri.path == "/search" && query != null -> {
                navigateToSearch(query)
            }
            uri.path == "/profile" -> {
                navigateToProfile()
            }
            else -> {
                // Unknown deep link - show home
            }
        }
    }

    private fun handleCustomSchemeDeepLink(uri: Uri, postId: Int?) {
        // Handle custom scheme: myapp://post/{id}
        if (uri.host == "post" && postId != null) {
            navigateToPost(postId)
        }
    }

    private fun navigateToPost(postId: Int) {
        val navHostFragment = supportFragmentManager
            .findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        val navController = navHostFragment.navController

        val bundle = Bundle().apply {
            putInt("postId", postId)
        }
        navController.navigate(R.id.postDetailFragment, bundle)
    }

    private fun navigateToSearch(query: String) {
        val navHostFragment = supportFragmentManager
            .findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        val navController = navHostFragment.navController

        val bundle = Bundle().apply {
            putString("query", query)
        }
        navController.navigate(R.id.searchFragment, bundle)
    }

    private fun navigateToProfile() {
        val navHostFragment = supportFragmentManager
            .findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        val navController = navHostFragment.navController

        navController.navigate(R.id.profileFragment)
    }
}