From 4481d274012a59b55cff9a51f1ae3c89c4782126 Mon Sep 17 00:00:00 2001
From: yibo <bboonnee@gmail.com>
Date: Wed, 2 Sep 2026 01:41:39 +0800
Subject: [PATCH] Add JSON CRUD store for dressup dance room asset libraries (T1)

---
 dressup-store.js | 10 ++++++++++
 store.js         | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 store.test.js    | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 113 insertions(+), 0 deletions(-)
 create mode 100644 dressup-store.js
 create mode 100644 store.js
 create mode 100644 store.test.js

diff --git a/dressup-store.js b/dressup-store.js
new file mode 100644
index 0000000..77418a0
--- /dev/null
+++ b/dressup-store.js
@@ -0,0 +1,10 @@
+// The three cold-start asset libraries for the dressup dance room
+// (dev-plan.md T1; schemas: dressup-dance-room-mvcp.md M.3/M.4/M.5).
+const path = require("path");
+const { createStore } = require("./store.js");
+
+const characters = createStore(path.join(__dirname, "characters.json"));
+const garments = createStore(path.join(__dirname, "garments.json"));
+const danceRefs = createStore(path.join(__dirname, "dance-refs.json"));
+
+module.exports = { characters, garments, danceRefs };
diff --git a/store.js b/store.js
new file mode 100644
index 0000000..38bbe31
--- /dev/null
+++ b/store.js
@@ -0,0 +1,51 @@
+// Generic JSON-file CRUD store (dev-plan.md T1), shared by characters.json/
+// garments.json/dance-refs.json. Same full-read/full-write pattern as
+// server.js's library.json — no in-memory cache, so a process restart just
+// re-reads the file.
+const fs = require("fs");
+const crypto = require("crypto");
+
+function createStore(filePath) {
+  function all() {
+    try {
+      return JSON.parse(fs.readFileSync(filePath, "utf8"));
+    } catch {
+      return [];
+    }
+  }
+  function save(items) {
+    fs.writeFileSync(filePath, JSON.stringify(items, null, 2));
+  }
+
+  return {
+    list() {
+      return all();
+    },
+    get(id) {
+      return all().find((item) => item.id === id) || null;
+    },
+    create(data) {
+      const items = all();
+      const item = { id: crypto.randomUUID(), createdAt: Date.now(), ...data };
+      items.push(item);
+      save(items);
+      return item;
+    },
+    update(id, patch) {
+      const items = all();
+      const idx = items.findIndex((item) => item.id === id);
+      if (idx === -1) return null;
+      items[idx] = { ...items[idx], ...patch, id };
+      save(items);
+      return items[idx];
+    },
+    remove(id) {
+      const items = all();
+      const next = items.filter((item) => item.id !== id);
+      save(next);
+      return next.length !== items.length;
+    },
+  };
+}
+
+module.exports = { createStore };
diff --git a/store.test.js b/store.test.js
new file mode 100644
index 0000000..6c175f4
--- /dev/null
+++ b/store.test.js
@@ -0,0 +1,52 @@
+// RED/GREEN check for the JSON CRUD store shared by characters/garments/
+// dance-refs (dev-plan.md T1). Run: node --test store.test.js
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const fs = require("node:fs");
+const os = require("node:os");
+const path = require("node:path");
+const { createStore } = require("./store.js");
+
+function tempFile() {
+  return path.join(os.tmpdir(), `store-test-${Date.now()}-${Math.random().toString(36).slice(2)}.json`);
+}
+
+test("create/list/get/update/remove round-trip", () => {
+  const file = tempFile();
+  const store = createStore(file);
+
+  const created = store.create({ name: "test" });
+  assert.equal(typeof created.id, "string");
+  assert.equal(created.name, "test");
+  assert.equal(typeof created.createdAt, "number");
+
+  assert.deepEqual(store.list(), [created]);
+  assert.deepEqual(store.get(created.id), created);
+
+  const updated = store.update(created.id, { name: "updated" });
+  assert.equal(updated.name, "updated");
+  assert.equal(updated.id, created.id);
+
+  assert.equal(store.remove(created.id), true);
+  assert.deepEqual(store.list(), []);
+  assert.equal(store.remove(created.id), false);
+
+  fs.unlinkSync(file);
+});
+
+test("data survives a fresh store instance pointed at the same file (simulated process restart)", () => {
+  const file = tempFile();
+  const store1 = createStore(file);
+  const created = store1.create({ name: "persisted" });
+
+  const store2 = createStore(file); // new instance, no shared in-memory state
+  assert.deepEqual(store2.get(created.id), created);
+
+  fs.unlinkSync(file);
+});
+
+test("list() on a missing file returns an empty array, not a throw", () => {
+  const file = tempFile(); // never created
+  const store = createStore(file);
+  assert.deepEqual(store.list(), []);
+});
--
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