diff --git a/app/src/main/java/apps/amine/bou/readerforselfoss/ReaderActivity.kt b/app/src/main/java/apps/amine/bou/readerforselfoss/ReaderActivity.kt
index 1b848a0..f5887d1 100644
--- a/app/src/main/java/apps/amine/bou/readerforselfoss/ReaderActivity.kt
+++ b/app/src/main/java/apps/amine/bou/readerforselfoss/ReaderActivity.kt
@@ -1,16 +1,27 @@
 package apps.amine.bou.readerforselfoss
 
+import android.content.Context
 import android.os.Bundle
+import android.preference.PreferenceManager
 import android.support.v4.app.FragmentManager
 import android.support.v4.app.FragmentStatePagerAdapter
+import android.support.v4.view.ViewPager
 import android.support.v7.app.AppCompatActivity
 import android.view.MenuItem
 import apps.amine.bou.readerforselfoss.api.selfoss.Item
+import apps.amine.bou.readerforselfoss.api.selfoss.SelfossApi
+import apps.amine.bou.readerforselfoss.api.selfoss.SuccessResponse
 import apps.amine.bou.readerforselfoss.fragments.ArticleFragment
 import apps.amine.bou.readerforselfoss.transformers.DepthPageTransformer
+import apps.amine.bou.readerforselfoss.utils.Config
+import apps.amine.bou.readerforselfoss.utils.succeeded
+import com.crashlytics.android.Crashlytics
 import com.ftinc.scoop.Scoop
 import kotlinx.android.synthetic.main.activity_reader.*
 import me.relex.circleindicator.CircleIndicator
+import retrofit2.Call
+import retrofit2.Callback
+import retrofit2.Response
 
 class ReaderActivity : AppCompatActivity() {
 
@@ -25,6 +36,19 @@ class ReaderActivity : AppCompatActivity() {
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
         supportActionBar?.setDisplayShowHomeEnabled(true)
 
+        val settings = getSharedPreferences(Config.settingsName, Context.MODE_PRIVATE)
+        val sharedPref = PreferenceManager.getDefaultSharedPreferences(this)
+
+        val debugReadingItems = sharedPref.getBoolean("read_debug", false)
+        val userIdentifier = sharedPref.getString("unique_id", "")
+
+        val api = SelfossApi(
+                this,
+                this@ReaderActivity,
+                settings.getBoolean("isSelfSignedCert", false),
+                sharedPref.getBoolean("should_log_everything", false)
+        )
+
         allItems = intent.getParcelableArrayListExtra<Item>("allItems")
         val currentItem = intent.getIntExtra("currentItem", 0)
 
@@ -34,6 +58,56 @@ class ReaderActivity : AppCompatActivity() {
 
         pager.setPageTransformer(true, DepthPageTransformer())
         (indicator as CircleIndicator).setViewPager(pager)
+
+        pager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() {
+            var isLastItem = false
+
+            override fun onPageSelected(position: Int) {
+                isLastItem = (position === (allItems.size - 1))
+            }
+
+            override fun onPageScrollStateChanged(state: Int) {
+                if (state === ViewPager.SCROLL_STATE_DRAGGING || (state === ViewPager.SCROLL_STATE_IDLE && isLastItem)) {
+                    api.markItem(allItems[pager.currentItem].id).enqueue(
+                            object : Callback<SuccessResponse> {
+                                override fun onResponse(
+                                        call: Call<SuccessResponse>,
+                                        response: Response<SuccessResponse>
+                                ) {
+                                    if (!response.succeeded() && debugReadingItems) {
+                                        val message =
+                                                "message: ${response.message()} " +
+                                                        "response isSuccess: ${response.isSuccessful} " +
+                                                        "response code: ${response.code()} " +
+                                                        "response message: ${response.message()} " +
+                                                        "response errorBody: ${response.errorBody()?.string()} " +
+                                                        "body success: ${response.body()?.success} " +
+                                                        "body isSuccess: ${response.body()?.isSuccess}"
+                                        Crashlytics.setUserIdentifier(userIdentifier)
+                                        Crashlytics.log(100, "READ_DEBUG_SUCCESS", message)
+                                        Crashlytics.logException(Exception("Was success, but did it work ?"))
+                                    }
+                                }
+
+                                override fun onFailure(call: Call<SuccessResponse>, t: Throwable) {
+                                    if (debugReadingItems) {
+                                        Crashlytics.setUserIdentifier(userIdentifier)
+                                        Crashlytics.log(100, "READ_DEBUG_ERROR", t.message)
+                                        Crashlytics.logException(t)
+                                    }
+                                }
+                            }
+                    )
+                }
+            }
+        })
+
+
+    }
+
+    override fun onPause() {
+        super.onPause()
+        pager.clearOnPageChangeListeners()
     }
 
     private inner class ScreenSlidePagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {