Polls part 1 - displaying in timelines and voting (#1200)

* add entity classes

* change data models and add database migration

* add polls to StatusViewData

* show poll results

* add methods for vote handling

* add voting interface

* enable voting in TimelineFragment

* update polls immediately

* enable custom emojis for poll options

* enable voting from search fragment

* add voting layout to detailed statuses

* fix tests

* enable voting in ViewThreadFragment

* enable voting in ConversationsFragment

* small refactor for StatusBaseViewHolder

app/src/main/java/com/keylesspalace/tusky/entity/Poll.kt

@@ -0,0 +1,33 @@
+package com.keylesspalace.tusky.entity
+
+import com.google.gson.annotations.SerializedName
+import java.util.*
+
+data class Poll(
+        val id: String,
+        @SerializedName("expires_at") val expiresAt: Date?,
+        val expired: Boolean,
+        val multiple: Boolean,
+        @SerializedName("votes_count") val votesCount: Int,
+        val options: List<PollOption>,
+        val voted: Boolean
+) {
+
+    fun votedCopy(choices: List<Int>): Poll {
+        val newOptions = options.mapIndexed { index, option ->
+            if(choices.contains(index)) {
+                option.copy(votesCount = option.votesCount + 1)
+            } else {
+                option
+            }
+        }
+
+        return copy(options = newOptions, votesCount = votesCount + 1, voted = true)
+    }
+
+}
+
+data class PollOption(
+        val title: String,
+        @SerializedName("votes_count") val votesCount: Int
+)

app/src/main/java/com/keylesspalace/tusky/entity/Status.kt

@@ -39,7 +39,8 @@ data class Status(
         @SerializedName("media_attachments") var attachments: ArrayList<Attachment>,
         val mentions: Array<Mention>,
         val application: Application?,
-        var pinned: Boolean?
+        var pinned: Boolean?,
+        val poll: Poll?
 ) {
 
     val actionableId: String
@@ -161,5 +162,6 @@ data class Status(
 
     companion object {
         const val MAX_MEDIA_ATTACHMENTS = 4
+        const val MAX_POLL_OPTIONS = 4
     }
 }