Manage the Slack digest in the admin

New settings area: the webhook lives in the database and is only shown
shortened afterwards, the environment variable stays as a fallback. A switch
decides whether internal entries travel, a button sends the digest right
away, and every run is recorded with period, count, projects, result and
who triggered it.

tests/lib/report-settings.test.ts

@@ -0,0 +1,57 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { db } from '~/data/db'
+import { appSettings } from '~/data/schema'
+import { listReportRuns, writeSetting } from '~/data/repositories/settings'
+import { readSlackConfig, reportScope, runWeeklyReport } from '~/lib/report-settings'
+
+const origin = 'https://logbuch.nyo.de'
+
+beforeEach(async () => {
+	await db.delete(appSettings)
+	delete process.env.SLACK_WEBHOOK_URL
+	vi.unstubAllGlobals()
+})
+
+describe('readSlackConfig', () => {
+	it('nimmt den hinterlegten Webhook vor der Umgebungsvariable', async () => {
+		process.env.SLACK_WEBHOOK_URL = 'https://hooks.slack.com/services/aus/der/umgebung'
+		await writeSetting('slack.webhook', 'https://hooks.slack.com/services/aus/der/verwaltung')
+
+		const config = await readSlackConfig()
+
+		expect(config.webhook).toContain('verwaltung')
+		expect(config.fromEnv).toBe(false)
+	})
+
+	it('fällt auf die Umgebungsvariable zurück', async () => {
+		process.env.SLACK_WEBHOOK_URL = 'https://hooks.slack.com/services/aus/der/umgebung'
+
+		const config = await readSlackConfig()
+
+		expect(config.fromEnv).toBe(true)
+	})
+
+	it('schickt interne Beiträge mit, solange nichts anderes gesetzt ist', async () => {
+		expect(reportScope(await readSlackConfig())).toBe('internal')
+
+		await writeSetting('slack.includeInternal', 'false')
+
+		expect(reportScope(await readSlackConfig())).toBe('customer')
+	})
+})
+
+describe('runWeeklyReport', () => {
+	it('vermerkt einen Lauf ohne Veröffentlichungen, ohne zu senden', async () => {
+		const fetchMock = vi.fn()
+		vi.stubGlobal('fetch', fetchMock)
+
+		const outcome = await runWeeklyReport({ origin, trigger: 'test' })
+
+		expect(outcome.reason).toBe('nothing_published')
+		expect(fetchMock).not.toHaveBeenCalled()
+
+		const runs = await listReportRuns(1)
+
+		expect(runs[0]).toMatchObject({ sent: false, total: 0, trigger: 'test', detail: 'nothing_published' })
+	})
+})