// The Team notification fan-out and the digest worker (TEAMS.md §6.2/§6.4).
//
// The layer above teamNotify.test.js: that one asserts WHO a recipient set
// contains, this one asserts what actually happens to them — which stream fires,
// what a mail carries, and the four ways a notification is correctly suppressed.
//
// The suppressions are the point. A notification feature is mostly refusals, and
// each of these is one that would be invisible until it went wrong in production:
//
//   • forums switched off silences forum notifications, including the digest;
//   • no email configured means the sink is absent, not broken;
//   • a Team's FIRST roster does not wake 155 phones;
//   • a failed send does not stamp `last_digest_at`, so the window is retried
//     rather than silently skipped.
const { test, beforeEach, afterEach } = require('node:test')
const assert = require('node:assert/strict')

const notify = require('../src/utils/teamNotify')
const digest = require('../src/utils/teamDigestWorker')
const pushDispatch = require('../src/utils/pushDispatch')
const mailer = require('../src/utils/mailer')
const forumSettings = require('../src/model/teams/teamForumSettings.model')
const notifyModel = require('../src/model/teams/teamNotify.model')
const registries = require('../src/modules/registries')

const saved = new Map()

function patch(mod, name, fn) {
  if (!saved.has(mod)) saved.set(mod, new Map())
  if (!saved.get(mod).has(name)) saved.get(mod).set(name, mod[name])
  mod[name] = fn
}

function restore() {
  for (const [mod, names] of saved) for (const [name, fn] of names) mod[name] = fn
  saved.clear()
}

const TEAM = { id: 1, slug: 'silver-hand', name: 'The Silver Hand', external_id: 'g1', display_name_override: null }

let sent   // tickles
let mails  // emails
let world

function stub({ forumsEnabled = true, emailConfigured = true, recipients = [10, 11], emailRows = [] } = {}) {
  sent = []
  mails = []
  world = { stamped: [] }

  patch(forumSettings, 'forumsEnabled', async () => forumsEnabled)
  patch(mailer, 'isConfigured', async () => emailConfigured)
  patch(mailer, 'sendTeamNotification', async (msg) => {
    mails.push(msg)
    return { sent: true }
  })
  patch(pushDispatch, 'publishToUsers', async (streamId, payload) => { sent.push({ streamId, ...payload }) })
  patch(notifyModel, 'recipientIds', async (teamId, { exclude = [] } = {}) =>
    recipients.filter((id) => !exclude.includes(id)))
  patch(notifyModel, 'emailRecipients', async (teamId, { exclude = [] } = {}) =>
    emailRows.filter((r) => !exclude.includes(r.user_id)))
  patch(notifyModel, 'stampDigest', async (userId, teamId, at) => { world.stamped.push({ userId, teamId, at }) })
  // No module registered: the default in most tests, so the link-building ones
  // have to opt in and the absence is exercised rather than assumed.
  patch(registries, 'registeredTeamProvider', () => null)
}

beforeEach(() => stub())
afterEach(restore)

// ── Which stream fires ─────────────────────────────────────────────────────

test('a discussion reply fires team.forum.post; an announcement fires its own stream', async () => {
  await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  await notify.forumPost({ team: TEAM, threadId: 8, threadTitle: 'Notice', type: 'announcement', authorUserId: 10 })
  assert.deepEqual(sent.map((s) => s.streamId), ['team.forum.post', 'team.announcement'])
})

test('the tickle is content-free and refs the thread, never the body', async () => {
  await notify.forumPost({
    team: TEAM, threadId: 7, threadTitle: 'Secret plans', type: 'discussion', authorUserId: 99,
    bodyHtml: '<p>the actual private text</p>',
  })
  assert.deepEqual(Object.keys(sent[0]).sort(), ['ref', 'streamId', 'userIds'])
  assert.equal(sent[0].ref, 'team:1:thread:7')
  assert.equal(JSON.stringify(sent[0]).includes('private text'), false)
})

test('the author is not among the tickled', async () => {
  await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  assert.deepEqual(sent[0].userIds, [11])
})

test('roster events fire one tickle for the run, not one per member', async () => {
  await notify.memberJoined(TEAM)
  await notify.leadershipChanged(TEAM)
  assert.deepEqual(sent.map((s) => s.streamId), ['team.member.joined', 'team.leadership.changed'])
  assert.equal(sent.every((s) => s.ref === 'team:1'), true)
})

// ── Suppression ────────────────────────────────────────────────────────────

test('forums switched off silences a forum notification entirely', async () => {
  stub({ forumsEnabled: false })
  const res = await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  // `bridged` is phase 8's third sink (§7.2). Asserted as part of the shape
  // rather than ignored: "forums are off" has to silence every sink, and a test
  // that only checked two would not notice a third one still firing.
  assert.deepEqual(res, { push: 0, emails: 0, bridged: false })
  assert.equal(sent.length, 0)
})

test('a roster tickle survives forums being off — it is not forum content', async () => {
  stub({ forumsEnabled: false })
  await notify.memberJoined(TEAM)
  assert.equal(sent.length, 1)
})

test('no recipients means no publish call at all', async () => {
  stub({ recipients: [] })
  await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  assert.equal(sent.length, 0)
})

test('a fan-out never throws, whatever the layer below does', async () => {
  patch(notifyModel, 'recipientIds', async () => { throw new Error('database is on fire') })
  const res = await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  assert.deepEqual(res, { push: 0, emails: 0, bridged: false })
  assert.equal(await notify.memberJoined(TEAM), 0)
})

// ── Email, the immediate mode ──────────────────────────────────────────────

const IMMEDIATE = [{ user_id: 11, username: 'eleven', email: 'e@example.test', email_mode: 'immediate' }]

test('only the immediate-mode recipients are emailed per event', async () => {
  stub({
    emailRows: [
      ...IMMEDIATE,
      { user_id: 12, username: 'twelve', email: 'd@example.test', email_mode: 'digest' },
      { user_id: 13, username: 'thirteen', email: 'o@example.test', email_mode: 'off' },
    ],
  })
  await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10, bodyHtml: '<p>hello</p>' })
  assert.deepEqual(mails.map((m) => m.to), ['e@example.test'])
})

test('an email carries an excerpt and never the whole post', async () => {
  stub({ emailRows: IMMEDIATE })
  const long = `<p>${'x'.repeat(500)}</p>`
  await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10, bodyHtml: long })
  const body = mails[0].items[0].excerpt
  assert.equal(body.length < 250, true)
  assert.equal(body.endsWith('…'), true)
})

test('no email configured means no send and no recipient query', async () => {
  stub({ emailConfigured: false, emailRows: IMMEDIATE })
  const res = await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  assert.equal(res.emails, 0)
  assert.equal(mails.length, 0)
})

test('every email carries an unsubscribe url for that recipient and that Team', async () => {
  stub({ emailRows: IMMEDIATE })
  await notify.forumPost({ team: TEAM, threadId: 7, threadTitle: 'Hi', type: 'discussion', authorUserId: 10 })
  assert.equal(typeof mails[0].unsubscribeUrl, 'string')
  // The header one is an API endpoint (a one-click client POSTs to it without
  // rendering anything); the body one is the site's page. They must differ.
  assert.notEqual(mails[0].unsubscribeUrl, mails[0].unsubscribeApiUrl)
  assert.match(mails[0].unsubscribeApiUrl, /\/api\/v1\/public\/teams\/unsubscribe\//)
})

// ── Links, and the module that supplies them ───────────────────────────────

test('with no module-supplied template there is no Team link, and nothing breaks', async () => {
  assert.equal(notify.teamPageUrl(TEAM), null)
  assert.equal(notify.threadUrl(TEAM, 7), null)
})

test('a registered template becomes an absolute link, and a thread deep-links by search param', () => {
  patch(registries, 'registeredTeamProvider', () => ({ pageUrlTemplate: '/uo/guilds/{externalId}' }))
  assert.match(notify.teamPageUrl(TEAM), /\/uo\/guilds\/g1$/)
  assert.match(notify.threadUrl(TEAM, 7), /\/uo\/guilds\/g1\?thread=7$/)
})

test('a Team is labelled by its display-name override where staff set one', () => {
  assert.equal(notify.teamLabel(TEAM), 'The Silver Hand')
  assert.equal(notify.teamLabel({ ...TEAM, display_name_override: 'Renamed' }), 'Renamed')
})

// ── The digest worker ──────────────────────────────────────────────────────

const DIGEST_ROW = { user_id: 11, username: 'eleven', email: 'e@example.test', email_mode: 'digest', last_digest_at: null }

function stubDigest({ posts = [], teams = [TEAM], rows = [DIGEST_ROW], sendOk = true } = {}) {
  patch(notifyModel, 'teamsWithForumActivitySince', async () => teams)
  patch(notifyModel, 'emailRecipients', async () => rows)
  patch(notifyModel, 'digestPostsSince', async () => posts)
  patch(mailer, 'sendTeamNotification', async (msg) => {
    mails.push(msg)
    return { sent: sendOk }
  })
}

test('a digest gathers the Team’s new posts into one mail', async () => {
  stubDigest({
    posts: [
      { id: 1, thread_id: 7, title: 'Raid', body_html: '<p>tonight</p>', author_username: 'ten' },
      { id: 2, thread_id: 7, title: 'Raid', body_html: '<p>bring rope</p>', author_username: 'eleven' },
    ],
  })
  const res = await digest.tick(new Date())
  assert.equal(res.sent, 1)
  assert.equal(mails.length, 1)
  assert.equal(mails[0].items.length, 2)
})

test('a recipient with nothing new gets no mail and no stamp', async () => {
  stubDigest({ posts: [] })
  const res = await digest.tick(new Date())
  assert.equal(res.sent, 0)
  assert.equal(mails.length, 0)
  assert.equal(world.stamped.length, 0, 'stamping here would move the window past unsent posts')
})

test('a failed send leaves last_digest_at alone so the window is retried', async () => {
  stubDigest({ posts: [{ id: 1, thread_id: 7, title: 'Raid', body_html: '<p>x</p>', author_username: 'ten' }], sendOk: false })
  const res = await digest.tick(new Date())
  assert.equal(res.sent, 0)
  assert.equal(world.stamped.length, 0)
})

test('a successful send stamps exactly that (user, Team)', async () => {
  stubDigest({ posts: [{ id: 1, thread_id: 7, title: 'Raid', body_html: '<p>x</p>', author_username: 'ten' }] })
  const now = new Date()
  await digest.tick(now)
  assert.deepEqual(world.stamped, [{ userId: 11, teamId: 1, at: now }])
})

test('only digest-mode recipients are swept', async () => {
  stubDigest({
    posts: [{ id: 1, thread_id: 7, title: 'Raid', body_html: '<p>x</p>', author_username: 'ten' }],
    rows: [
      DIGEST_ROW,
      { user_id: 12, username: 'twelve', email: 'i@example.test', email_mode: 'immediate', last_digest_at: null },
      { user_id: 13, username: 'thirteen', email: 'o@example.test', email_mode: 'off', last_digest_at: null },
    ],
  })
  await digest.tick(new Date())
  assert.deepEqual(mails.map((m) => m.to), ['e@example.test'])
})

test('the sweep is skipped whole when forums are off or email is unconfigured', async () => {
  stub({ forumsEnabled: false })
  assert.equal((await digest.tick(new Date())).skipped, 'forums-disabled')
  stub({ emailConfigured: false })
  assert.equal((await digest.tick(new Date())).skipped, 'email-unconfigured')
})

test('the sweep never throws, and says so in its summary', async () => {
  patch(notifyModel, 'teamsWithForumActivitySince', async () => { throw new Error('nope') })
  assert.equal((await digest.tick(new Date())).skipped, 'error')
})

// ── The digest window ──────────────────────────────────────────────────────

test('a first digest reaches back one interval, not to the lookback floor', () => {
  const now = new Date('2026-08-18T12:00:00Z')
  const since = digest.clampSince(null, now)
  assert.equal(now - since <= 24 * 60 * 60 * 1000, true)
})

test('a long outage is clamped: one digest, not a week of replay', () => {
  const now = new Date('2026-08-18T12:00:00Z')
  const ancient = new Date('2026-01-01T00:00:00Z')
  const since = digest.clampSince(ancient, now)
  assert.equal(now - since, digest.MAX_LOOKBACK_MS)
})

test('an ordinary last-send is used as-is', () => {
  const now = new Date('2026-08-18T12:00:00Z')
  const yesterday = new Date('2026-08-17T12:00:00Z')
  assert.equal(digest.clampSince(yesterday, now).getTime(), yesterday.getTime())
})