feat(state): project actions into columns and story tree

src/state/__tests__/viewModel.test.ts

@@ -1,7 +1,8 @@
 import { describe, expect, it } from 'vitest';
 import { buildContent } from '../../content/schema';
 import { buildStoryContent } from '../../content/storySchema';
-import { createGameState, enqueueAction, startAction } from '../../engine/game';
+import { content } from '../../content/index';
+import { createGameState, enqueueAction, performAction, startAction } from '../../engine/game';
 import { enterStoryNode } from '../../engine/story';
 import { formatOfflineDuration, toView } from '../viewModel';
 
@@ -193,3 +194,72 @@ describe('formatOfflineDuration()', () => {
     expect(formatOfflineDuration(7_200_000)).toBe('2h');
   });
 });
+
+describe('action columns projection', () => {
+  it('produces all five kind columns in fixed order', () => {
+    const state = createGameState(content);
+    const view = toView(state, content);
+    expect(view.actionColumns.map((c) => c.kind)).toEqual([
+      'instant', 'loop', 'timed', 'story', 'context',
+    ]);
+  });
+
+  it('groups timed actions by their content group', () => {
+    const state = createGameState(content);
+    const view = toView(state, content);
+    const timed = view.actionColumns.find((c) => c.kind === 'timed');
+    expect(timed?.groups.some((g) => g.id === 'camp')).toBe(true);
+    expect(timed?.groups.some((g) => g.id === 'travel')).toBe(true);
+  });
+
+  it('marks loopEnabled from enabledLoopActionIds', () => {
+    const state = createGameState(content);
+    state.enabledLoopActionIds = { rest: true };
+    const view = toView(state, content);
+    const rest = view.actionColumns
+      .flatMap((c) => c.groups)
+      .flatMap((g) => g.actions)
+      .find((a) => a.id === 'rest');
+    expect(rest?.loopEnabled).toBe(true);
+  });
+
+  it('shows story actions only when their choice is available, hiding siblings after a fork is taken', () => {
+    const state = createGameState(content);
+    // before reaching the fork, story actions are hidden
+    let storyCol = toView(state, content).actionColumns.find((c) => c.kind === 'story');
+    expect(storyCol?.groups.flatMap((g) => g.actions)).toHaveLength(0);
+    // at the fork, both story actions appear
+    enterStoryNode(state, content, 'fork_choice');
+    storyCol = toView(state, content).actionColumns.find((c) => c.kind === 'story');
+    const idsAtFork = storyCol?.groups.flatMap((g) => g.actions).map((a) => a.id) ?? [];
+    expect(idsAtFork).toEqual(expect.arrayContaining(['pick_high_road', 'follow_river']));
+    // after taking route A, the sibling hides
+    performAction(state, content, 'pick_high_road');
+    storyCol = toView(state, content).actionColumns.find((c) => c.kind === 'story');
+    expect(storyCol?.groups.flatMap((g) => g.actions)).toHaveLength(0);
+  });
+});
+
+describe('story tree projection', () => {
+  it('builds a tree marking seen and active nodes', () => {
+    const state = createGameState(content);
+    enterStoryNode(state, content, 'fork_choice');
+    const view = toView(state, content);
+    // fork_choice should be a node in the tree, marked active+seen, with route children
+    const findNode = (nodes: typeof view.story.tree, id: string): (typeof nodes)[number] | undefined => {
+      for (const n of nodes) {
+        if (n.id === id) return n;
+        const deeper = findNode(n.children, id);
+        if (deeper) return deeper;
+      }
+      return undefined;
+    };
+    const fork = findNode(view.story.tree, 'fork_choice');
+    expect(fork).toBeDefined();
+    expect(fork?.active).toBe(true);
+    expect(fork?.seen).toBe(true);
+    expect(fork?.children.map((c) => c.id)).toEqual(
+      expect.arrayContaining(['route_a_beat', 'route_b_beat']),
+    );
+  });
+});