Add support for archiving conversations

Archiving messages currently acts like recycle bin in
Simple Gallery, meaning that after 30 days, conversations
will be deleted permanently. Any updates to the conversation
(new messages) removes it from archive.

This closes #177

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/ArchivedConversationsActivity.kt

@@ -0,0 +1,150 @@
+package com.simplemobiletools.smsmessenger.activities
+
+import android.annotation.SuppressLint
+import android.content.Intent
+import android.os.Bundle
+import com.simplemobiletools.commons.extensions.*
+import com.simplemobiletools.commons.helpers.*
+import com.simplemobiletools.smsmessenger.R
+import com.simplemobiletools.smsmessenger.adapters.ArchivedConversationsAdapter
+import com.simplemobiletools.smsmessenger.extensions.*
+import com.simplemobiletools.smsmessenger.helpers.*
+import com.simplemobiletools.smsmessenger.models.Conversation
+import com.simplemobiletools.smsmessenger.models.Events
+import kotlinx.android.synthetic.main.activity_archived_conversations.*
+import org.greenrobot.eventbus.EventBus
+import org.greenrobot.eventbus.Subscribe
+import org.greenrobot.eventbus.ThreadMode
+
+class ArchivedConversationsActivity : SimpleActivity() {
+    private var bus: EventBus? = null
+
+    @SuppressLint("InlinedApi")
+    override fun onCreate(savedInstanceState: Bundle?) {
+        isMaterialActivity = true
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_archived_conversations)
+        setupOptionsMenu()
+
+        updateMaterialActivityViews(archive_coordinator, conversations_list, useTransparentNavigation = true, useTopSearchMenu = false)
+        setupMaterialScrollListener(conversations_list, archive_toolbar)
+
+        loadArchivedConversations()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        setupToolbar(archive_toolbar, NavigationIcon.Arrow)
+        updateMenuColors()
+
+        loadArchivedConversations()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        bus?.unregister(this)
+    }
+
+    private fun setupOptionsMenu() {
+        archive_toolbar.inflateMenu(R.menu.archive_menu)
+
+        archive_toolbar.setOnMenuItemClickListener { menuItem ->
+            when (menuItem.itemId) {
+                R.id.empty_archive -> removeAll()
+                else -> return@setOnMenuItemClickListener false
+            }
+            return@setOnMenuItemClickListener true
+        }
+    }
+
+    private fun updateMenuColors() {
+        updateStatusbarColor(getProperBackgroundColor())
+    }
+
+    private fun loadArchivedConversations() {
+        ensureBackgroundThread {
+            val conversations = try {
+                conversationsDB.getAllArchived().toMutableList() as ArrayList<Conversation>
+            } catch (e: Exception) {
+                ArrayList()
+            }
+
+            runOnUiThread {
+                setupConversations(conversations)
+            }
+        }
+
+        bus = EventBus.getDefault()
+        try {
+            bus!!.register(this)
+        } catch (e: Exception) {
+        }
+    }
+
+    private fun removeAll() {
+        removeAllArchivedConversations {
+            loadArchivedConversations()
+        }
+    }
+
+    private fun getOrCreateConversationsAdapter(): ArchivedConversationsAdapter {
+        var currAdapter = conversations_list.adapter
+        if (currAdapter == null) {
+            hideKeyboard()
+            currAdapter = ArchivedConversationsAdapter(
+                activity = this,
+                recyclerView = conversations_list,
+                onRefresh = { notifyDatasetChanged() },
+                itemClick = { handleConversationClick(it) }
+            )
+
+            conversations_list.adapter = currAdapter
+            if (areSystemAnimationsEnabled) {
+                conversations_list.scheduleLayoutAnimation()
+            }
+        }
+        return currAdapter as ArchivedConversationsAdapter
+    }
+
+    private fun setupConversations(conversations: ArrayList<Conversation>) {
+        val sortedConversations = conversations.sortedWith(
+            compareByDescending<Conversation> { config.pinnedConversations.contains(it.threadId.toString()) }
+                .thenByDescending { it.date }
+        ).toMutableList() as ArrayList<Conversation>
+
+        showOrHidePlaceholder(conversations.isEmpty())
+
+        try {
+            getOrCreateConversationsAdapter().apply {
+                updateConversations(sortedConversations)
+            }
+        } catch (ignored: Exception) {
+        }
+    }
+
+    private fun showOrHidePlaceholder(show: Boolean) {
+        conversations_fastscroller.beGoneIf(show)
+        no_conversations_placeholder.beVisibleIf(show)
+        no_conversations_placeholder.text = getString(R.string.no_conversations_found)
+    }
+
+    @SuppressLint("NotifyDataSetChanged")
+    private fun notifyDatasetChanged() {
+        getOrCreateConversationsAdapter().notifyDataSetChanged()
+    }
+
+    private fun handleConversationClick(any: Any) {
+        Intent(this, ThreadActivity::class.java).apply {
+            val conversation = any as Conversation
+            putExtra(THREAD_ID, conversation.threadId)
+            putExtra(THREAD_TITLE, conversation.title)
+            putExtra(WAS_PROTECTION_HANDLED, true)
+            startActivity(this)
+        }
+    }
+
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    fun refreshMessages(event: Events.RefreshMessages) {
+        loadArchivedConversations()
+    }
+}