Add getGenres app call.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicApiGetGenresTest.kt

@@ -0,0 +1,37 @@
+package org.moire.ultrasonic.api.subsonic
+
+import org.amshove.kluent.`should equal to`
+import org.amshove.kluent.`should equal`
+import org.junit.Test
+import org.moire.ultrasonic.api.subsonic.models.Genre
+
+/**
+ * Integration test for [SubsonicAPIDefinition.getGenres] call.
+ */
+class SubsonicApiGetGenresTest : SubsonicAPIClientTest() {
+    @Test
+    fun `Should handle error response`() {
+        val response = checkErrorCallParsed(mockWebServerRule) {
+            client.api.getGenres().execute()
+        }
+
+        response.genresList `should equal` emptyList()
+    }
+
+    @Test
+    fun `Should handle ok response`() {
+        mockWebServerRule.enqueueResponse("get_genres_ok.json")
+
+        val response = client.api.getGenres().execute()
+
+        assertResponseSuccessful(response)
+        with(response.body().genresList) {
+            size `should equal to` 5
+            this[0] `should equal` Genre(1186, 103, "Rock")
+            this[1] `should equal` Genre(896, 72, "Electronic")
+            this[2] `should equal` Genre(790, 59, "Alternative Rock")
+            this[3] `should equal` Genre(622, 97, "Trance")
+            this[4] `should equal` Genre(476, 36, "Hard Rock")
+        }
+    }
+}

subsonic-api/src/integrationTest/resources/get_genres_ok.json

@@ -0,0 +1,29 @@
+{
+  "subsonic-response" : {
+    "status" : "ok",
+    "version" : "1.15.0",
+    "genres" : {
+      "genre" : [ {
+        "songCount" : 1186,
+        "albumCount" : 103,
+        "value" : "Rock"
+      }, {
+        "songCount" : 896,
+        "albumCount" : 72,
+        "value" : "Electronic"
+      }, {
+        "songCount" : 790,
+        "albumCount" : 59,
+        "value" : "Alternative Rock"
+      }, {
+        "songCount" : 622,
+        "albumCount" : 97,
+        "value" : "Trance"
+      }, {
+        "songCount" : 476,
+        "albumCount" : 36,
+        "value" : "Hard Rock"
+      } ]
+    }
+  }
+}

subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicAPIDefinition.kt

@@ -3,6 +3,7 @@ package org.moire.ultrasonic.api.subsonic
 import okhttp3.ResponseBody
 import org.moire.ultrasonic.api.subsonic.models.AlbumListType
 import org.moire.ultrasonic.api.subsonic.models.JukeboxAction
+import org.moire.ultrasonic.api.subsonic.response.GenresResponse
 import org.moire.ultrasonic.api.subsonic.response.GetAlbumList2Response
 import org.moire.ultrasonic.api.subsonic.response.GetAlbumListResponse
 import org.moire.ultrasonic.api.subsonic.response.GetAlbumResponse
@@ -197,4 +198,7 @@ interface SubsonicAPIDefinition {
     fun createShare(@Query("id") idsToShare: List<String>,
                     @Query("description") description: String? = null,
                     @Query("expires") expires: Long? = null): Call<SharesResponse>
+
+    @GET("getGenres.view")
+    fun getGenres(): Call<GenresResponse>
 }

subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/models/Genre.kt

@@ -0,0 +1,7 @@
+package org.moire.ultrasonic.api.subsonic.models
+
+import com.fasterxml.jackson.annotation.JsonProperty
+
+data class Genre(val songCount: Int = 0,
+                 val albumCount: Int = 0,
+                 @JsonProperty("value") val name: String)

subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/response/GenresResponse.kt

@@ -0,0 +1,15 @@
+package org.moire.ultrasonic.api.subsonic.response
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import org.moire.ultrasonic.api.subsonic.SubsonicAPIVersions
+import org.moire.ultrasonic.api.subsonic.SubsonicError
+import org.moire.ultrasonic.api.subsonic.models.Genre
+
+class GenresResponse(status: Status,
+                     version: SubsonicAPIVersions,
+                     error: SubsonicError?) : SubsonicResponse(status, version, error) {
+    @JsonProperty("genres") private val genresWrapper = GenresWrapper()
+    val genresList: List<Genre> get() = genresWrapper.genresList
+}
+
+internal class GenresWrapper(@JsonProperty("genre") val genresList: List<Genre> = emptyList())