feat: add quest class and session getActiveStages

packages/game/test/session.test.ts

@@ -0,0 +1,58 @@
+import { expect, describe, it } from '@jest/globals'
+import { IQuest } from '../src/schema'
+import { Session } from '../src/Session'
+
+const quest: IQuest = {
+  id: 'quest1',
+  title: 'Quest 1',
+  image: 'image1',
+  instruction: 'Instruction 1',
+  requirements: [],
+  stages: [
+    {
+      id: 'stage1',
+      requirements: [],
+      condition: {},
+      response: { type: 'narrative', content: 'Narrative 1' },
+    },
+    {
+      id: 'stage2',
+      requirements: ['stage1'],
+      condition: {},
+      response: { type: 'narrative', content: 'Narrative 2' },
+    },
+    {
+      id: 'stage3',
+      requirements: ['stage1'],
+      condition: {},
+      response: { type: 'narrative', content: 'Narrative 3' },
+    },
+    {
+      id: 'stage4',
+      requirements: ['stage2', 'stage3'],
+      condition: {},
+      response: { type: 'narrative', content: 'Narrative 4' },
+    },
+  ],
+}
+
+describe('Session', () => {
+  it('should return active stages', () => {
+    const session = new Session(
+      {
+        completedStages: [],
+      },
+      quest
+    )
+    expect(session.getActiveStages()).toEqual(['stage1'])
+
+    session.complete('stage1')
+    expect(session.getActiveStages()).toEqual(['stage2', 'stage3'])
+
+    session.complete('stage2')
+    expect(session.getActiveStages()).toEqual(['stage3'])
+
+    session.complete('stage3')
+    expect(session.getActiveStages()).toEqual(['stage4'])
+  })
+})