fix: load reply/reaction events from repository into digest context

Instead of setting context = events (which made repliesByParentId always
empty), query the repository for events that #e-tag our matched event
IDs with kinds NOTE, COMMENT, or REACTION. This gives buildParameters
real reply/reaction data to count.

Fixes the bug where every event in the digest email showed
'0 replies / 0 reactions'.

Added test/digest-reply-stats.test.ts that:
- Publishes reply and reaction events into a mock repository
- Calls sendFromStoredEvents with only the parent event
- Asserts that the resulting digest parameters show Replies >= 1 and
  Reactions >= 1

src/digest.ts

@@ -25,6 +25,7 @@ import { EVENT_VIEWER_URL } from './env.js'
 import {
   profilesByPubkey,
   loadProfile,
+  repository,
 } from './repository.js'
 
 type DigestData = {
@@ -86,7 +87,6 @@ export class Digest {
 
   sendFromStoredEvents = async (storedEvents: { id: string; event: TrustedEvent; relay: string }[]) => {
     const events = storedEvents.map(se => se.event)
-    const context = [...events] // For now, context == events (no reply loading)
     const relayByEventId = new Map(storedEvents.map(se => [se.event.id, se.relay]))
 
     // Load profiles for event authors
@@ -101,6 +101,13 @@ export class Digest {
       }
     }
 
+    // Load reply/reaction context: events that tag our matched events
+    const eventIds = events.map(e => e.id)
+    const replyEvents = repository.query([
+      { '#e': eventIds, kinds: [NOTE, COMMENT, REACTION] },
+    ])
+    const context = [...events, ...replyEvents]
+
     const data = { events, context, relayByEventId } as DigestData
 
     if (data.events.length > 0) {

test/digest-reply-stats.test.ts

@@ -0,0 +1,167 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import type { TrustedEvent } from '@welshman/util'
+import { spec } from '@welshman/lib'
+
+// ── Shared state accessible from both vi.mock factories and test body ──────
+const mockRepo = vi.hoisted(() => {
+  const events: TrustedEvent[] = []
+  return {
+    events, // shared mutable array
+    query: vi.fn((filters: any[]) => {
+      return events.filter(e => {
+        for (const f of filters) {
+          // #e filter: event must have an 'e' tag whose value matches one of the filter values
+          if (f['#e']) {
+            const eTagVals = e.tags.filter(t => t[0] === 'e').map(t => t[1])
+            if (!f['#e'].some((id: string) => eTagVals.includes(id))) return false
+          }
+          // kinds filter
+          if (f.kinds && !f.kinds.includes(e.kind)) return false
+        }
+        return true
+      })
+    }),
+    publish: vi.fn((event: TrustedEvent) => {
+      events.push(event)
+      return true
+    }),
+  }
+})
+
+// ── Mocks (hoisted before imports) ─────────────────────────────────────────
+// ── Mock profiles map (pre-populated so waitForProfile doesn't time out) ──
+const mockProfilesMap = vi.hoisted(() => new Map())
+
+vi.mock('../src/repository.js', () => ({
+  profilesByPubkey: { get: () => mockProfilesMap },
+  loadProfile: vi.fn().mockResolvedValue(undefined),
+  repository: mockRepo,
+}))
+
+vi.mock('../src/util.js', () => {
+  const createElementMock = vi.fn().mockImplementation((tagName: string) => {
+    const el: any = { tagName, children: [], innerText: '' }
+    el.appendChild = (child: any) => { el.children.push(child) }
+    el.toString = () =>
+      `<${tagName}>${el.innerText}${el.children.map((c: any) => c.toString()).join('')}</${tagName}>`
+    return el
+  })
+  return {
+    displayDuration: vi.fn().mockReturnValue('1 hour'),
+    createElement: createElementMock,
+  }
+})
+
+// Captured digest parameters (set by the mailer mock)
+let lastDigestParams: Record<string, any> | undefined
+
+vi.mock('../src/mailer.js', () => ({
+  sendDigest: vi.fn((_sub: any, variables: Record<string, any>) => {
+    lastDigestParams = variables
+  }),
+}))
+
+// ── Imports (after mocks) ──────────────────────────────────────────────────
+import { Digest } from '../src/digest.js'
+import type { Subscription } from '../src/alert.js'
+
+// Valid 64-char hex strings for nostr IDs and pubkeys
+const PARENT_ID = 'aaa' + 'a'.repeat(61)  // 64 hex chars
+const REPLY_ID = 'bbb' + 'b'.repeat(61)
+const REACTION_ID = 'ccc' + 'c'.repeat(61)
+const PARENT_PK = 'ddd' + 'd'.repeat(61)
+const REPLIER_PK = 'eee' + 'e'.repeat(61)
+const REACTER_PK = 'fff' + 'f'.repeat(61)
+
+function makeEvent(overrides: Partial<TrustedEvent>): TrustedEvent {
+  const eid = overrides.id || 'a'.repeat(64)
+  return {
+    id: eid,
+    kind: 1,
+    pubkey: PARENT_PK,
+    created_at: Math.floor(Date.now() / 1000),
+    tags: [],
+    content: 'test content',
+    ...overrides,
+    id: eid,
+  } as TrustedEvent
+}
+
+describe('digest reply/reaction stats', () => {
+  let sub: Subscription
+
+  beforeEach(() => {
+    // Reset shared state
+    mockRepo.events.length = 0
+    lastDigestParams = undefined
+
+    sub = {
+      id: 'sub-1',
+      key: 'key-1',
+      pubkey: PARENT_PK,
+      email: 'test@example.com',
+      frequency: 'daily',
+      created_at: Math.floor(Date.now() / 1000) - 3600,
+      confirmed_at: Math.floor(Date.now() / 1000) - 3600,
+    }
+  })
+
+  it('should count replies and reactions loaded from repository context', async () => {
+    // Create a parent event
+    const parentEvent = makeEvent({
+      id: PARENT_ID,
+      kind: 1,
+      pubkey: PARENT_PK,
+      content: 'Hello world, this is the parent event',
+      created_at: Math.floor(Date.now() / 1000) - 600,
+    })
+
+    // Create a reply event referencing the parent via an 'e' tag
+    const replyEvent = makeEvent({
+      id: REPLY_ID,
+      kind: 1,
+      pubkey: REPLIER_PK,
+      content: 'This is a reply to the parent',
+      created_at: Math.floor(Date.now() / 1000) - 500,
+      tags: [['e', PARENT_ID, '', 'root']],
+    })
+
+    // Create a reaction event (kind 7 = REACTION)
+    const reactionEvent = makeEvent({
+      id: REACTION_ID,
+      kind: 7,
+      pubkey: REACTER_PK,
+      content: '+',
+      created_at: Math.floor(Date.now() / 1000) - 400,
+      tags: [['e', PARENT_ID, '', 'root']],
+    })
+
+    // Publish reply/reaction events to the mock repository so the fix can find them
+    mockRepo.publish(replyEvent)
+    mockRepo.publish(reactionEvent)
+
+    // Pre-populate profiles so waitForProfile resolves immediately
+    mockProfilesMap.set(PARENT_PK, { pubkey: PARENT_PK, name: 'parent-user', picture: '' })
+    mockProfilesMap.set(REPLIER_PK, { pubkey: REPLIER_PK, name: 'replier', picture: '' })
+    mockProfilesMap.set(REACTER_PK, { pubkey: REACTER_PK, name: 'reacter', picture: '' })
+
+    const storedEvents = [
+      { id: 'se-1', event: parentEvent, relay: 'wss://relay.example.com' },
+    ]
+
+    const digest = new Digest(sub)
+    await digest.sendFromStoredEvents(storedEvents)
+
+    // sendDigest should have been called with the template parameters
+    expect(lastDigestParams).toBeDefined()
+
+    const latest = lastDigestParams!.Latest
+    expect(latest.length).toBeGreaterThanOrEqual(1)
+
+    const parentEntry = latest[0]
+    // When context includes reply/reaction events loaded from the repository,
+    // Replies should be >= 1 and Reactions >= 1
+    expect(parentEntry.Replies).toBeGreaterThanOrEqual(1)
+    expect(parentEntry.Reactions).toBeGreaterThanOrEqual(1)
+  })
+})