Total overhaul!

src/input-select-controller.js

@@ -0,0 +1,41 @@
+import {Controller} from "./controller.js";
+
+export class InputSelectController extends Controller {
+
+  get _value() {
+    return this.stateObj.attributes.options.indexOf(this.stateObj.state);
+  }
+
+  set _value(value) {
+    if (value in this.stateObj.attributes.options)
+      this._hass.callService("input_select", "select_option", {
+        entity_id: this.stateObj.entity_id,
+        option: this.stateObj.attributes.options[value],
+      });
+  }
+
+  get string() {
+    return this.stateObj.state;
+  }
+
+  get isOff() {
+    return false;
+  }
+
+  get hasToggle() {
+    return false;
+  }
+
+  get hasSlider() {
+    return this.stateObj.attributes.options && this.stateObj.attributes.options.length > 0
+  }
+
+  get _max() {
+    return this.stateObj.attributes.options.length - 1;
+  }
+
+  get _step() {
+    return 1;
+  }
+
+}