Switch remaining primary observables

15 files changed, 81 insertions, 90 deletions

diff --git a/app/src/main/kotlin/com/pitchedapps/frost/activities/AboutActivity.kt b/app/src/main/kotlin/com/pitchedapps/frost/activities/AboutActivity.kt
index a110071c..283477d7 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/activities/AboutActivity.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/activities/AboutActivity.kt
@@ -176,7 +176,8 @@ class AboutActivity : AboutActivityBase(null, {
                 }
                 val set = ConstraintSet()
                 set.clone(container)
-                set.createHorizontalChain(ConstraintSet.PARENT_ID,
+                set.createHorizontalChain(
+                    ConstraintSet.PARENT_ID,
                     ConstraintSet.LEFT,
                     ConstraintSet.PARENT_ID,
                     ConstraintSet.RIGHT,
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/activities/BaseMainActivity.kt b/app/src/main/kotlin/com/pitchedapps/frost/activities/BaseMainActivity.kt
index 20b5727f..78f6bfb9 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/activities/BaseMainActivity.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/activities/BaseMainActivity.kt
@@ -341,7 +341,7 @@ abstract class BaseMainActivity : BaseActivity(), MainActivityContract,
 
     private fun refreshAll() {
         L.d { "Refresh all" }
-        fragmentSubject.onNext(REQUEST_REFRESH)
+        fragmentChannel.offer(REQUEST_REFRESH)
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
@@ -424,9 +424,9 @@ abstract class BaseMainActivity : BaseActivity(), MainActivityContract,
             /*
              * These results can be stacked
              */
-            if (resultCode and REQUEST_REFRESH > 0) fragmentSubject.onNext(REQUEST_REFRESH)
+            if (resultCode and REQUEST_REFRESH > 0) fragmentChannel.offer(REQUEST_REFRESH)
             if (resultCode and REQUEST_NAV > 0) frostNavigationBar()
-            if (resultCode and REQUEST_TEXT_ZOOM > 0) fragmentSubject.onNext(REQUEST_TEXT_ZOOM)
+            if (resultCode and REQUEST_TEXT_ZOOM > 0) fragmentChannel.offer(REQUEST_TEXT_ZOOM)
             if (resultCode and REQUEST_SEARCH > 0) invalidateOptionsMenu()
         }
     }
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/activities/MainActivity.kt b/app/src/main/kotlin/com/pitchedapps/frost/activities/MainActivity.kt
index d03c6496..cc375800 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/activities/MainActivity.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/activities/MainActivity.kt
@@ -24,12 +24,15 @@ import com.pitchedapps.frost.views.BadgedIcon
 import io.reactivex.android.schedulers.AndroidSchedulers
 import io.reactivex.schedulers.Schedulers
 import io.reactivex.subjects.PublishSubject
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.channels.BroadcastChannel
 import org.jsoup.Jsoup
 import java.util.concurrent.TimeUnit
 
+@UseExperimental(ExperimentalCoroutinesApi::class)
 class MainActivity : BaseMainActivity() {
 
-    override val fragmentSubject = PublishSubject.create<Int>()
+    override val fragmentChannel = BroadcastChannel<Int>(10)
     var lastPosition = -1
     val headerBadgeObservable = PublishSubject.create<String>()
 
@@ -43,8 +46,8 @@ class MainActivity : BaseMainActivity() {
             override fun onPageSelected(position: Int) {
                 super.onPageSelected(position)
                 if (lastPosition == position) return
-                if (lastPosition != -1) fragmentSubject.onNext(-(lastPosition + 1))
-                fragmentSubject.onNext(position)
+                if (lastPosition != -1) fragmentChannel.offer(-(lastPosition + 1))
+                fragmentChannel.offer(position)
                 lastPosition = position
             }
 
@@ -62,7 +65,7 @@ class MainActivity : BaseMainActivity() {
                 }
             }
         })
-        viewPager.post { fragmentSubject.onNext(0); lastPosition = 0 } //trigger hook so title is set
+        viewPager.post { fragmentChannel.offer(0); lastPosition = 0 } //trigger hook so title is set
     }
 
     private fun setupTabs() {
@@ -101,8 +104,9 @@ class MainActivity : BaseMainActivity() {
                 }
             }.disposeOnDestroy()
         adapter.pages.forEach {
-            tabs.addTab(tabs.newTab()
-                .setCustomView(BadgedIcon(this).apply { iicon = it.icon })
+            tabs.addTab(
+                tabs.newTab()
+                    .setCustomView(BadgedIcon(this).apply { iicon = it.icon })
             )
         }
     }
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/activities/WebOverlayActivity.kt b/app/src/main/kotlin/com/pitchedapps/frost/activities/WebOverlayActivity.kt
index 816524ba..19a1109f 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/activities/WebOverlayActivity.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/activities/WebOverlayActivity.kt
@@ -67,13 +67,12 @@ import com.pitchedapps.frost.utils.Showcase
 import com.pitchedapps.frost.utils.frostSnackbar
 import com.pitchedapps.frost.utils.materialDialogThemed
 import com.pitchedapps.frost.utils.setFrostColors
+import com.pitchedapps.frost.utils.uniqueOnly
 import com.pitchedapps.frost.views.FrostContentWeb
 import com.pitchedapps.frost.views.FrostVideoViewer
 import com.pitchedapps.frost.views.FrostWebView
-import io.reactivex.android.schedulers.AndroidSchedulers
-import io.reactivex.disposables.Disposable
-import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import okhttp3.HttpUrl
@@ -91,6 +90,7 @@ import okhttp3.HttpUrl
  * Used by notifications. Unlike the other overlays, this runs as a singleInstance
  * Going back will bring you back to the previous app
  */
+@UseExperimental(ExperimentalCoroutinesApi::class)
 class FrostWebActivity : WebOverlayActivityBase(false) {
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -151,6 +151,7 @@ class WebOverlayBasicActivity : WebOverlayActivityBase(true)
 class WebOverlayActivity : WebOverlayActivityBase(false)
 
 @SuppressLint("Registered")
+@UseExperimental(ExperimentalCoroutinesApi::class)
 open class WebOverlayActivityBase(private val forceBasicAgent: Boolean) : BaseActivity(),
     ActivityContract, FrostContentContainer,
     VideoViewHolder, FileChooserContract by FileChooserDelegate() {
@@ -203,7 +204,7 @@ open class WebOverlayActivityBase(private val forceBasicAgent: Boolean) : BaseAc
 
         content.bind(this)
 
-        val titleReceiver = content.titleChannel.openSubscription()
+        val titleReceiver = content.titleChannel.openSubscription().uniqueOnly(this)
 
         launch {
             for (t in titleReceiver) {
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/contracts/ActivityContract.kt b/app/src/main/kotlin/com/pitchedapps/frost/contracts/ActivityContract.kt
index 2ce83871..9a70436e 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/contracts/ActivityContract.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/contracts/ActivityContract.kt
@@ -19,7 +19,7 @@ package com.pitchedapps.frost.contracts
 import com.mikepenz.iconics.typeface.IIcon
 import com.pitchedapps.frost.activities.MainActivity
 import com.pitchedapps.frost.fragments.BaseFragment
-import io.reactivex.subjects.PublishSubject
+import kotlinx.coroutines.channels.BroadcastChannel
 
 /**
  * All the contracts for [MainActivity]
@@ -27,7 +27,7 @@ import io.reactivex.subjects.PublishSubject
 interface ActivityContract : FileChooserActivityContract
 
 interface MainActivityContract : ActivityContract, MainFabContract {
-    val fragmentSubject: PublishSubject<Int>
+    val fragmentChannel: BroadcastChannel<Int>
     fun setTitle(res: Int)
     fun setTitle(text: CharSequence)
     /**
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/contracts/FrostContentContract.kt b/app/src/main/kotlin/com/pitchedapps/frost/contracts/FrostContentContract.kt
index 0f8c49d3..8a6e57af 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/contracts/FrostContentContract.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/contracts/FrostContentContract.kt
@@ -18,12 +18,9 @@ package com.pitchedapps.frost.contracts
 
 import android.view.View
 import com.pitchedapps.frost.facebook.FbItem
-import io.reactivex.subjects.BehaviorSubject
-import io.reactivex.subjects.PublishSubject
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.channels.BroadcastChannel
-import kotlinx.coroutines.channels.Channel
 
 /**
  * Created by Allan Wang on 20/12/17.
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentBase.kt b/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentBase.kt
index 2c46edbc..c5880840 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentBase.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentBase.kt
@@ -39,12 +39,13 @@ import com.pitchedapps.frost.utils.Prefs
 import com.pitchedapps.frost.utils.REQUEST_REFRESH
 import com.pitchedapps.frost.utils.REQUEST_TEXT_ZOOM
 import com.pitchedapps.frost.utils.frostEvent
-import io.reactivex.android.schedulers.AndroidSchedulers
-import io.reactivex.disposables.Disposable
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.channels.ReceiveChannel
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import kotlin.coroutines.CoroutineContext
 
 /**
@@ -87,7 +88,7 @@ abstract class BaseFragment : Fragment(), CoroutineScope, FragmentContract, Dyna
     override var valid: Boolean
         get() = arguments!!.getBoolean(ARG_VALID, true)
         set(value) {
-            if (value || this is WebFragment) return
+            if (!isActive || value || this is WebFragment) return
             arguments!!.putBoolean(ARG_VALID, value)
             L.e { "Invalidating position $position" }
             frostEvent(
@@ -98,7 +99,7 @@ abstract class BaseFragment : Fragment(), CoroutineScope, FragmentContract, Dyna
         }
 
     override var firstLoad: Boolean = true
-    private var activityDisposable: Disposable? = null
+    private var activityReceiver: ReceiveChannel<Int>? = null
     private var onCreateRunnable: ((FragmentContract) -> Unit)? = null
 
     override var content: FrostContentParent? = null
@@ -154,29 +155,34 @@ abstract class BaseFragment : Fragment(), CoroutineScope, FragmentContract, Dyna
         (context as? MainActivityContract)?.setTitle(title)
     }
 
-    override fun attachMainObservable(contract: MainActivityContract): Disposable =
-        contract.fragmentSubject.observeOn(AndroidSchedulers.mainThread()).subscribe {
-            when (it) {
-                REQUEST_REFRESH -> {
-                    core?.apply {
-                        clearHistory()
-                        firstLoad = true
-                        firstLoadRequest()
+    override fun attachMainObservable(contract: MainActivityContract): ReceiveChannel<Int> {
+        val receiver = contract.fragmentChannel.openSubscription()
+        launch {
+            for (flag in receiver) {
+                when (flag) {
+                    REQUEST_REFRESH -> {
+                        core?.apply {
+                            clearHistory()
+                            firstLoad = true
+                            firstLoadRequest()
+                        }
+                    }
+                    position -> {
+                        contract.setTitle(baseEnum.titleId)
+                        updateFab(contract)
+                        core?.active = true
+                    }
+                    -(position + 1) -> {
+                        core?.active = false
+                    }
+                    REQUEST_TEXT_ZOOM -> {
+                        reloadTextSize()
                     }
-                }
-                position -> {
-                    contract.setTitle(baseEnum.titleId)
-                    updateFab(contract)
-                    core?.active = true
-                }
-                -(position + 1) -> {
-                    core?.active = false
-                }
-                REQUEST_TEXT_ZOOM -> {
-                    reloadTextSize()
                 }
             }
         }
+        return receiver
+    }
 
     override fun updateFab(contract: MainFabContract) {
         contract.hideFab() // default
@@ -195,14 +201,14 @@ abstract class BaseFragment : Fragment(), CoroutineScope, FragmentContract, Dyna
     }
 
     override fun detachMainObservable() {
-        activityDisposable?.dispose()
+        activityReceiver?.cancel()
     }
 
     override fun onAttach(context: Context) {
         super.onAttach(context)
         detachMainObservable()
         if (context is MainActivityContract)
-            activityDisposable = attachMainObservable(context)
+            activityReceiver = attachMainObservable(context)
     }
 
     override fun onDetach() {
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentContract.kt b/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentContract.kt
index eaef17e5..10c612c5 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentContract.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/fragments/FragmentContract.kt
@@ -22,7 +22,7 @@ import com.pitchedapps.frost.contracts.FrostContentParent
 import com.pitchedapps.frost.contracts.MainActivityContract
 import com.pitchedapps.frost.contracts.MainFabContract
 import com.pitchedapps.frost.views.FrostRecyclerView
-import io.reactivex.disposables.Disposable
+import kotlinx.coroutines.channels.ReceiveChannel
 
 /**
  * Created by Allan Wang on 2017-11-07.
@@ -34,8 +34,9 @@ interface FragmentContract : FrostContentContainer {
 
     /**
      * Defines whether the fragment is valid in the viewpager
-     * Or if it needs to be recreated
-     * May be called from any thread to toggle status
+     * or if it needs to be recreated
+     * May be called from any thread to toggle status.
+     * Note that calls beyond the fragment lifecycle will be ignored
      */
     var valid: Boolean
 
@@ -75,9 +76,10 @@ interface FragmentContract : FrostContentContainer {
 
     /**
      * Call whenever a fragment is attached so that it may listen
-     * to activity emissions
+     * to activity emissions.
+     * Returns a means of closing the listener, which can be called from [detachMainObservable]
      */
-    fun attachMainObservable(contract: MainActivityContract): Disposable
+    fun attachMainObservable(contract: MainActivityContract): ReceiveChannel<Int>
 
     /**
      * Call when fragment is detached so that any existing
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragmentBase.kt b/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragmentBase.kt
index ddb9fde6..c03ac0e2 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragmentBase.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragmentBase.kt
@@ -21,7 +21,6 @@ import com.mikepenz.fastadapter.FastAdapter
 import com.mikepenz.fastadapter.IItem
 import com.mikepenz.fastadapter.adapters.ItemAdapter
 import com.mikepenz.fastadapter.adapters.ModelAdapter
-import com.mikepenz.fastadapter_extensions.items.ProgressItem
 import com.pitchedapps.frost.R
 import com.pitchedapps.frost.facebook.FbCookie
 import com.pitchedapps.frost.facebook.parsers.FrostParser
@@ -142,31 +141,3 @@ abstract class FrostParserFragment<T : Any, Item : IItem<*, *>> : RecyclerFragme
         return@withContext items
     }
 }
-
-//abstract class PagedRecyclerFragment<T : Any, Item : IItem<*, *>> : RecyclerFragment<T, Item>() {
-//
-//    var allowPagedLoading = true
-//
-//    val footerAdapter = ItemAdapter<FrostProgress>()
-//
-//    val footerScrollListener = object : EndlessRecyclerOnScrollListener(footerAdapter) {
-//        override fun onLoadMore(currentPage: Int) {
-//            TODO("not implemented")
-//
-//        }
-//
-//    }
-//
-//    override fun getAdapter() = fastAdapter(adapter, footerAdapter)
-//
-//    override fun bindImpl(recyclerView: FrostRecyclerView) {
-//        recyclerView.addOnScrollListener(footerScrollListener)
-//    }
-//
-//    override fun reload(progress: (Int) -> Unit, callback: (Boolean) -> Unit) {
-//        footerScrollListener.
-//        super.reload(progress, callback)
-//    }
-//}
-
-class FrostProgress : ProgressItem()
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragments.kt b/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragments.kt
index 45cf2290..f7ed9937 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragments.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/fragments/RecyclerFragments.kt
@@ -37,7 +37,6 @@ import com.pitchedapps.frost.iitems.NotificationIItem
 import com.pitchedapps.frost.utils.frostJsoup
 import com.pitchedapps.frost.views.FrostRecyclerView
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 /**
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/utils/KotlinUtils.kt b/app/src/main/kotlin/com/pitchedapps/frost/utils/KotlinUtils.kt
new file mode 100644
index 00000000..320aeb69
--- /dev/null
+++ b/app/src/main/kotlin/com/pitchedapps/frost/utils/KotlinUtils.kt
@@ -0,0 +1,20 @@
+package com.pitchedapps.frost.utils
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.channels.ReceiveChannel
+import kotlinx.coroutines.channels.produce
+import kotlinx.coroutines.isActive
+
+@UseExperimental(ExperimentalCoroutinesApi::class)
+fun <T> ReceiveChannel<T>.uniqueOnly(scope: CoroutineScope): ReceiveChannel<T> = scope.produce {
+    var previous: T? = null
+    for (current in this@uniqueOnly) {
+        if (!scope.isActive) {
+            cancel()
+        } else if (previous != current) {
+            previous = current
+            send(current)
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/views/FrostContentView.kt b/app/src/main/kotlin/com/pitchedapps/frost/views/FrostContentView.kt
index 38591d38..9619eecc 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/views/FrostContentView.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/views/FrostContentView.kt
@@ -40,8 +40,6 @@ import com.pitchedapps.frost.facebook.WEB_LOAD_DELAY
 import com.pitchedapps.frost.utils.L
 import com.pitchedapps.frost.utils.Prefs
 import io.reactivex.disposables.Disposable
-import io.reactivex.subjects.BehaviorSubject
-import io.reactivex.subjects.PublishSubject
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/views/FrostRecyclerView.kt b/app/src/main/kotlin/com/pitchedapps/frost/views/FrostRecyclerView.kt
index 2ba78c5e..f7cb2214 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/views/FrostRecyclerView.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/views/FrostRecyclerView.kt
@@ -23,13 +23,11 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import ca.allanwang.kau.utils.circularReveal
 import ca.allanwang.kau.utils.fadeOut
-import com.pitchedapps.frost.R.string.reload
 import com.pitchedapps.frost.contracts.FrostContentContainer
 import com.pitchedapps.frost.contracts.FrostContentCore
 import com.pitchedapps.frost.contracts.FrostContentParent
 import com.pitchedapps.frost.fragments.RecyclerContentContract
 import com.pitchedapps.frost.utils.Prefs
-import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 
 /**
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/web/FrostChromeClients.kt b/app/src/main/kotlin/com/pitchedapps/frost/web/FrostChromeClients.kt
index f3538ec3..da90e7e5 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/web/FrostChromeClients.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/web/FrostChromeClients.kt
@@ -29,9 +29,6 @@ import com.pitchedapps.frost.contracts.ActivityContract
 import com.pitchedapps.frost.utils.L
 import com.pitchedapps.frost.utils.frostSnackbar
 import com.pitchedapps.frost.views.FrostWebView
-import io.reactivex.subjects.BehaviorSubject
-import io.reactivex.subjects.Subject
-import kotlinx.coroutines.channels.ReceiveChannel
 import kotlinx.coroutines.channels.SendChannel
 
 /**
@@ -47,7 +44,6 @@ class FrostChromeClient(web: FrostWebView) : WebChromeClient() {
 
     private val progress: SendChannel<Int> = web.parent.progressChannel
     private val title: SendChannel<String> = web.parent.titleChannel
-    private var prevTitle: String? = null
     private val activity = (web.context as? ActivityContract)
     private val context = web.context!!
 
@@ -58,8 +54,7 @@ class FrostChromeClient(web: FrostWebView) : WebChromeClient() {
 
     override fun onReceivedTitle(view: WebView, title: String) {
         super.onReceivedTitle(view, title)
-        if (title.startsWith("http") || prevTitle == title) return
-        prevTitle = title
+        if (title.startsWith("http")) return
         this.title.offer(title)
     }
 
diff --git a/app/src/main/kotlin/com/pitchedapps/frost/web/FrostWebViewClients.kt b/app/src/main/kotlin/com/pitchedapps/frost/web/FrostWebViewClients.kt
index 5a137c44..cb212b0a 100644
--- a/app/src/main/kotlin/com/pitchedapps/frost/web/FrostWebViewClients.kt
+++ b/app/src/main/kotlin/com/pitchedapps/frost/web/FrostWebViewClients.kt
@@ -40,7 +40,6 @@ import com.pitchedapps.frost.utils.isIndirectImageUrl
 import com.pitchedapps.frost.utils.launchImageActivity
 import com.pitchedapps.frost.utils.resolveActivityForUri
 import com.pitchedapps.frost.views.FrostWebView
-import io.reactivex.subjects.Subject
 import kotlinx.coroutines.channels.SendChannel
 import org.jetbrains.anko.withAlpha