Step 6.2 Complete — Museum Gallery reference exhibit and Contract 5.3 spec

2026-09-14 14:09:13 -07:00
parent 961919e017
commit 44f2ad3ee6
20 changed files with 5672 additions and 8 deletions
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+/*
+ * Museum Gallery — domain model.
+ *
+ * Deliberately tiny (Step 6.2 brief: "prove the architecture, not to be
+ * visually elaborate"). No DOM, no contract awareness, no transport — a
+ * plain state object with absolute, idempotent setters, exactly the same
+ * shape as Aquarium's and Haunted House's exhibit models.
+ */
+(function () {
+  'use strict';
+
+  var ARTIFACTS = ['the-orrery', 'star-map', 'meteorite'];
+  var ARTIFACT_LABELS = {
+    'the-orrery': 'The Orrery',
+    'star-map': 'Star Map',
+    meteorite: 'Meteorite Fragment'
+  };
+
+  function Gallery() {
+    this.artifact = ARTIFACTS[0];
+    this.lightingLevel = 0.6;
+    this.rotationSpeed = 0.4;
+    this.labelsEnabled = true;
+    this.spotlightFlashCount = 0;
+  }
+
+  Gallery.prototype.setArtifact = function (value) {
+    if (ARTIFACTS.indexOf(value) === -1 || this.artifact === value) return { changed: false };
+    this.artifact = value;
+    return { changed: true };
+  };
+
+  Gallery.prototype.setLightingLevel = function (value) {
+    if (this.lightingLevel === value) return { changed: false };
+    this.lightingLevel = value;
+    return { changed: true };
+  };
+
+  Gallery.prototype.setRotationSpeed = function (value) {
+    if (this.rotationSpeed === value) return { changed: false };
+    this.rotationSpeed = value;
+    return { changed: true };
+  };
+
+  Gallery.prototype.setLabelsEnabled = function (value) {
+    if (this.labelsEnabled === value) return { changed: false };
+    this.labelsEnabled = value;
+    return { changed: true };
+  };
+
+  Gallery.prototype.read = function (id) {
+    switch (id) {
+      case 'artifact.selected': return this.artifact;
+      case 'lighting.level': return this.lightingLevel;
+      case 'rotation.speed': return this.rotationSpeed;
+      case 'labels.enabled': return this.labelsEnabled;
+      default: return null;
+    }
+  };
+
+  Gallery.prototype.flashSpotlight = function () {
+    this.spotlightFlashCount += 1;
+    return { ok: true };
+  };
+
+  window.MuseumGalleryExhibit = {
+    Gallery: Gallery,
+    ARTIFACTS: ARTIFACTS,
+    ARTIFACT_LABELS: ARTIFACT_LABELS
+  };
+})();