Rewrite meta and add meta mutations (#556)

server/src/main/kotlin/suwayomi/tachidesk/graphql/mutations/MetaMutation.kt

@@ -0,0 +1,60 @@
+package suwayomi.tachidesk.graphql.mutations
+
+import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
+import org.jetbrains.exposed.sql.deleteWhere
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.transactions.transaction
+import suwayomi.tachidesk.global.impl.GlobalMeta
+import suwayomi.tachidesk.global.model.table.GlobalMetaTable
+import suwayomi.tachidesk.graphql.types.GlobalMetaType
+import suwayomi.tachidesk.manga.model.table.MangaMetaTable
+
+class MetaMutation {
+
+    data class SetGlobalMetaInput(
+        val clientMutationId: String? = null,
+        val meta: GlobalMetaType
+    )
+    data class SetGlobalMetaPayload(
+        val clientMutationId: String?,
+        val meta: GlobalMetaType
+    )
+    fun setGlobalMeta(
+        input: SetGlobalMetaInput
+    ): SetGlobalMetaPayload {
+        val (clientMutationId, meta) = input
+
+        GlobalMeta.modifyMeta(meta.key, meta.value)
+
+        return SetGlobalMetaPayload(clientMutationId, meta)
+    }
+
+    data class DeleteGlobalMetaInput(
+        val clientMutationId: String? = null,
+        val key: String
+    )
+    data class DeleteGlobalMetaPayload(
+        val clientMutationId: String?,
+        val meta: GlobalMetaType?
+    )
+    fun deleteGlobalMeta(
+        input: DeleteGlobalMetaInput
+    ): DeleteGlobalMetaPayload {
+        val (clientMutationId, key) = input
+
+        val meta = transaction {
+            val meta = GlobalMetaTable.select { MangaMetaTable.key eq key }
+                .firstOrNull()
+
+            GlobalMetaTable.deleteWhere { GlobalMetaTable.key eq key }
+
+            if (meta != null) {
+                GlobalMetaType(meta)
+            } else {
+                null
+            }
+        }
+
+        return DeleteGlobalMetaPayload(clientMutationId, meta)
+    }
+}