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# Phase 2: Calendar State (`src/calendar/calendar-state.ts`)
**Status:** Not started
**Depends on:** Phase 1 (daily-notes.ts — for `indexDailyNotes`, `getDateFromDailyNote`)
**Output file:** `src/calendar/calendar-state.ts`
---
## Overview
Simple state container with change notifications — replaces Svelte stores. Holds the displayed month, today's date, active file tracking, and the note index. Notifies subscribers on any state change.
---
## Design
```
class CalendarState:
- displayedMonth: Moment (current month being viewed)
- today: Moment (refreshed by heartbeat)
- activeFileDate: string | null (date UID of active file, if daily note)
- noteIndex: Map<string, TFile> (date string → file)
- listeners: Set<() => void>
Methods:
- subscribe(cb): () => void (unsubscribe function)
- setDisplayedMonth(m: Moment): void
- setActiveFile(file: TFile | null): void
- reindex(app: App, rootFolder: string): void
- tick(): void (refresh today)
- notify(): void (call all listeners)
```
---
## Notes
- `reindex()` delegates to `indexDailyNotes()` from Phase 1.
- `setActiveFile()` uses `getDateFromDailyNote()` from Phase 1 to determine if the file is a daily note.
- `tick()` updates `today` and calls `notify()` only if the date has changed (day rollover).
- Subscribers are plain callbacks — no framework dependency.
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