// ── Report, block and hide, for chat lines (USER_SAFETY.md §4.2) ───────────
//
// What this module promises core and the reader:
//
//   • a chat line is answered only to a reader who could have seen it — a line
//     on a server whose presence is hidden from them, or one staff hid when they
//     are not staff, is the same `null` as a line that is gone;
//   • a speaker is known by their linked account first, by Steam id only when
//     there is none (S12);
//   • the feed leaves out what this reader blocked or hid, IN the query, and
//     marks each line `canBlock` for a signed-in reader (S11, S13).

const test = require('node:test')
const assert = require('node:assert')

const { fakeCtx, spy } = require('./_fakes')

function withCore(overrides = {}) {
  require('../core')._reset()
  const ctx = fakeCtx(overrides)
  require('../core').init(ctx)
  return ctx
}

/** Swap named exports on a required file for the length of `fn`. */
async function stubbing(mod, stubs, fn) {
  const saved = {}
  for (const [name, value] of Object.entries(stubs)) {
    saved[name] = mod[name]
    mod[name] = value
  }
  try {
    return await fn()
  } finally {
    Object.assign(mod, saved)
  }
}

const LINE = {
  id: 4410,
  serverId: 'main',
  wipeId: 'w1',
  t: Date.UTC(2026, 9, 30, 10, 0, 0),
  steamId: '76561198000000001',
  raw: JSON.stringify({ name: 'Rusty', message: 'gg ez', channel: 'Global' }),
  hiddenAt: null,
}

const SEEN = { visible: true, level: 'signed_in', required: 'signed_in', userId: 7 }

function deps() {
  return {
    eventsDb: require('../model/events/events.db'),
    linksDb: require('../model/links/links.db'),
    serversDb: require('../model/servers/servers.db'),
    visibility: require('../model/visibility/visibility.model'),
    safety: require('../safety'),
  }
}

// ── registration ──────────────────────────────────────────────────────────

test('rust.chat and the steam identity are registered, in core’s shape', () => {
  require('../core')._reset()
  const { fakeApi } = require('./_fakes')
  const api = fakeApi()
  require('../index')(fakeCtx(), api)

  const [target] = api.record.reportTargets
  assert.strictEqual(api.record.reportTargets.length, 1)
  assert.strictEqual(target.id, 'rust.chat')
  // Core's rule: namespaced `<moduleId>.`, at most 32 characters, a label of 40.
  assert.match(target.id, /^rust\.[a-z0-9._-]+$/)
  assert.ok(target.id.length <= 32 && target.label.length <= 40)
  for (const name of ['snapshot', 'hide', 'unhide']) assert.strictEqual(typeof target[name], 'function')

  const [identity] = api.record.gameIdentities
  assert.strictEqual(api.record.gameIdentities.length, 1)
  assert.strictEqual(identity.kind, 'steam')
  assert.strictEqual(typeof identity.ownersOf, 'function')
})

// ── snapshot ──────────────────────────────────────────────────────────────

test('a line is described for a reader who could see it, with the linked account', async () => {
  withCore()
  const { eventsDb, linksDb, serversDb, visibility, safety } = deps()

  await stubbing(eventsDb, { chatLineById: async () => LINE }, () =>
    stubbing(visibility, { canSeePresenceAs: async () => SEEN }, () =>
      stubbing(linksDb, { userIdsForSteamIds: async () => [{ steamId: LINE.steamId, userId: 12 }] }, () =>
        stubbing(serversDb, { getServer: async () => ({ name: 'Main' }) }, async () => {
          const snap = await safety.snapshot({ targetId: 4410, viewer: { userId: 7, role: 'player' } })
          assert.deepStrictEqual(snap, {
            author: { name: 'Rusty', userId: 12, identity: { kind: 'steam', id: LINE.steamId } },
            text: 'gg ez',
            at: '2026-10-30T10:00:00.000Z',
            where: { server: 'main', serverName: 'Main', channel: 'Global', wipe: 'w1' },
          })
        }))))
})

test('an unlinked speaker has no account, only their Steam id', async () => {
  withCore()
  const { eventsDb, linksDb, serversDb, visibility, safety } = deps()

  await stubbing(eventsDb, { chatLineById: async () => LINE }, () =>
    stubbing(visibility, { canSeePresenceAs: async () => SEEN }, () =>
      stubbing(linksDb, { userIdsForSteamIds: async () => [] }, () =>
        stubbing(serversDb, { getServer: async () => null }, async () => {
          const snap = await safety.snapshot({ targetId: 4410, viewer: { userId: 7, role: 'player' } })
          assert.strictEqual(snap.author.userId, null)
          assert.deepStrictEqual(snap.author.identity, { kind: 'steam', id: LINE.steamId })
        }))))
})

test('a line the reader could not have seen is the same null as a missing one', async () => {
  withCore()
  const { eventsDb, visibility, safety } = deps()
  const viewer = { userId: 7, role: 'player' }

  await stubbing(eventsDb, { chatLineById: async () => null }, async () => {
    assert.strictEqual(await safety.snapshot({ targetId: 1, viewer }), null)
  })

  // Presence hidden from this reader on the line's server.
  await stubbing(eventsDb, { chatLineById: async () => LINE }, () =>
    stubbing(visibility, { canSeePresenceAs: async () => ({ ...SEEN, visible: false }) }, async () => {
      assert.strictEqual(await safety.snapshot({ targetId: 4410, viewer }), null)
    }))

  // Hidden by staff, and the reader is not staff (S10).
  const hidden = { ...LINE, hiddenAt: new Date() }
  await stubbing(eventsDb, { chatLineById: async () => hidden }, () =>
    stubbing(visibility, { canSeePresenceAs: async () => SEEN }, async () => {
      assert.strictEqual(await safety.snapshot({ targetId: 4410, viewer }), null)
    }))
})

test('staff still get a line staff hid, so the report can be read', async () => {
  withCore()
  const { eventsDb, linksDb, serversDb, visibility, safety } = deps()
  const hidden = { ...LINE, hiddenAt: new Date() }

  await stubbing(eventsDb, { chatLineById: async () => hidden }, () =>
    stubbing(visibility, { canSeePresenceAs: async () => ({ ...SEEN, level: 'staff' }) }, () =>
      stubbing(linksDb, { userIdsForSteamIds: async () => [] }, () =>
        stubbing(serversDb, { getServer: async () => null }, async () => {
          const snap = await safety.snapshot({ targetId: 4410, viewer: { userId: 1, role: 'moderator' } })
          assert.strictEqual(snap.text, 'gg ez')
        }))))
})

test('the presence check is made for the account core names, not the session role', async () => {
  withCore()
  const { eventsDb, visibility, safety } = deps()
  const asked = []

  await stubbing(eventsDb, { chatLineById: async () => LINE }, () =>
    stubbing(visibility, { canSeePresenceAs: async (userId, serverId) => { asked.push([userId, serverId]); return { ...SEEN, visible: false } } }, async () => {
      await safety.snapshot({ targetId: 4410, viewer: { userId: 7, role: 'admin' } })
    }))
  assert.deepStrictEqual(asked, [[7, 'main']])
})

// ── hide for everyone ─────────────────────────────────────────────────────

test('hide sets the flag with who did it; a pruned line is left alone', async () => {
  withCore()
  const { eventsDb, safety } = deps()
  const set = spy(Promise.resolve())

  await stubbing(eventsDb, { chatLineById: async () => LINE, setChatHidden: set }, async () => {
    await safety.hide({ targetId: 4410, actor: { id: 3, username: 'moderator', role: 'moderator' } })
    await safety.unhide({ targetId: 4410, actor: { id: 3 } })
  })
  assert.deepStrictEqual(set.calls, [[4410, true, 3], [4410, false]])

  const none = spy(Promise.resolve())
  await stubbing(eventsDb, { chatLineById: async () => null, setChatHidden: none }, async () => {
    await safety.hide({ targetId: 9, actor: { id: 3 } })
  })
  assert.deepStrictEqual(none.calls, [])
})

function fakeRes() {
  const res = { statusCode: 200, body: null }
  res.status = (code) => { res.statusCode = code; return res }
  res.json = (body) => { res.body = body; return res }
  res.end = () => res
  return res
}

test('the line’s own menu hides and unhides through admin routes, logged', async () => {
  const ctx = withCore()
  const { eventsDb } = deps()
  const admin = require('../router/admin/rust.controller')
  const set = spy(Promise.resolve())

  await stubbing(eventsDb, { chatLineById: async () => LINE, setChatHidden: set }, async () => {
    const res = fakeRes()
    await admin.hideChat({ params: { id: '4410' }, user: { id: 3 } }, res)
    assert.strictEqual(res.statusCode, 204)
    await admin.unhideChat({ params: { id: '4410' }, user: { id: 3 } }, fakeRes())
  })
  assert.deepStrictEqual(set.calls, [[4410, true, 3], [4410, false, 3]])
  assert.deepStrictEqual(ctx.activity.log.calls.map(([e]) => e.action), ['rust.chat.hide', 'rust.chat.unhide'])

  await stubbing(eventsDb, { chatLineById: async () => null }, async () => {
    const res = fakeRes()
    await admin.hideChat({ params: { id: '9' }, user: { id: 3 } }, res)
    assert.strictEqual(res.statusCode, 404)
  })
})

// ── the steam identity ────────────────────────────────────────────────────

test('ownersOf answers linked ids only, and asks nothing for an empty list', async () => {
  withCore()
  const { linksDb, safety } = deps()
  const asked = spy(async () => [{ steamId: '1', userId: 5 }])

  await stubbing(linksDb, { userIdsForSteamIds: asked }, async () => {
    assert.deepStrictEqual(await safety.ownersOf(['1', '2', '1', null]), { 1: 5 })
    assert.deepStrictEqual(await safety.ownersOf([]), {})
  })
  assert.deepStrictEqual(asked.calls, [[['1', '2']]])
})

// ── the feed ──────────────────────────────────────────────────────────────

test('a signed-out reader is filtered by nothing but staff’s hides', async () => {
  const ctx = withCore()
  const { safety } = deps()

  assert.deepStrictEqual(await safety.feedFilter({ userId: null, staff: false }), { showHidden: false, steamIds: [], ids: [] })
  assert.deepStrictEqual(ctx.safety.forViewer.calls, [])
})

test('a reader’s blocks become Steam ids: an account’s linked ids, and unlinked Steam blocks', async () => {
  withCore({
    safety: {
      forViewer: async () => ({
        blockedUserIds: [12],
        blockedIdentities: { steam: ['900'] },
        hidden: { 'rust.chat': [4410, 4411] },
      }),
      staffAmong: async () => [],
    },
  })
  const { linksDb, safety } = deps()
  const asked = spy(async () => ['100', '101'])

  await stubbing(linksDb, { steamIdsForUsers: asked }, async () => {
    assert.deepStrictEqual(await safety.feedFilter({ userId: 7, staff: true }), {
      showHidden: true,
      steamIds: ['100', '101', '900'],
      ids: [4410, 4411],
    })
  })
  assert.deepStrictEqual(asked.calls, [[[12]]])
})

test('a feed whose blocks cannot be read is shown unfiltered, not failed', async () => {
  withCore({ safety: { forViewer: async () => { throw new Error('db down') }, staffAmong: async () => [] } })
  const { safety } = deps()
  assert.deepStrictEqual(await safety.feedFilter({ userId: 7, staff: false }), { showHidden: false, steamIds: [], ids: [] })
})

test('canBlock: not your own lines, not a staff-linked player, not a line with no Steam id', async () => {
  withCore({ safety: { forViewer: async () => ({}), staffAmong: async (ids) => ids.filter((id) => id === 2) } })
  const { linksDb, safety } = deps()
  const rows = [
    { id: 1, kind: 'player.chat', steamId: 'mine' },
    { id: 2, kind: 'player.chat', steamId: 'staff' },
    { id: 3, kind: 'player.chat', steamId: 'linked' },
    { id: 4, kind: 'player.chat', steamId: 'unlinked' },
    { id: 5, kind: 'player.chat', steamId: null },
    { id: 6, kind: 'player.death', steamId: 'linked' },
  ]

  await stubbing(linksDb, {
    userIdsForSteamIds: async () => [
      { steamId: 'mine', userId: 7 },
      { steamId: 'staff', userId: 2 },
      { steamId: 'linked', userId: 12 },
    ],
  }, async () => {
    const out = await safety.annotate(rows, { userId: 7 })
    assert.deepStrictEqual(out.map((r) => r.canBlock), [false, false, true, true, false, undefined])
    // Signed out: untouched.
    assert.strictEqual(await safety.annotate(rows, { userId: null }), rows)
  })
})

test('when who is staff cannot be read, no line offers Block', async () => {
  withCore({ safety: { forViewer: async () => ({}), staffAmong: async () => { throw new Error('db down') } } })
  const { linksDb, safety } = deps()

  await stubbing(linksDb, { userIdsForSteamIds: async () => [{ steamId: 'a', userId: 12 }] }, async () => {
    const out = await safety.annotate([{ id: 1, kind: 'player.chat', steamId: 'a' }, { id: 2, kind: 'player.chat', steamId: 'b' }], { userId: 7 })
    assert.deepStrictEqual(out.map((r) => r.canBlock), [false, false])
  })
})

// ── the query ─────────────────────────────────────────────────────────────

test('the feed’s query leaves hidden, blocked and hidden-for-me chat out, and only chat', async () => {
  const ctx = withCore()
  const db = require('../model/events/events.db')

  await db.recentEvents({ serverId: 'main', kinds: ['player.chat', 'player.death'], limit: 50 })
  let [sql, params] = ctx.db.query.calls.at(-1)
  assert.match(sql, /NOT \(kind = 'player\.chat' AND hidden_at IS NOT NULL\)/)
  assert.deepStrictEqual(params, ['main', 'player.chat', 'player.death', 50])

  await db.recentEvents({
    serverId: 'main',
    kinds: ['player.chat'],
    limit: 50,
    chat: { showHidden: true, steamIds: ['100', '900'], ids: [4410] },
  });
  [sql, params] = ctx.db.query.calls.at(-1)
  assert.doesNotMatch(sql, /hidden_at IS NOT NULL/, 'staff get hidden lines')
  assert.match(sql, /NOT \(kind = 'player\.chat' AND steam_id IN \(\?, \?\)\)/)
  assert.match(sql, /NOT \(kind = 'player\.chat' AND id IN \(\?\)\)/)
  assert.deepStrictEqual(params, ['main', 'player.chat', '100', '900', 4410, 50])
})

test('the model passes the reader’s chat filter through, narrow by default, and marks staff’s hidden lines', async () => {
  withCore()
  const db = require('../model/events/events.db')
  const model = require('../model/events/events.model')
  let asked = null

  await stubbing(db, {
    recentEvents: async (args) => {
      asked = args
      return [{ id: 1, kind: 'player.chat', t: 1, steamId: 'a', raw: '{}', hiddenAt: new Date() }]
    },
  }, async () => {
    await model.recent({ serverId: 'main', presence: true })
    assert.deepStrictEqual(asked.chat, { showHidden: false, steamIds: [], ids: [] })

    const rows = await model.recent({ serverId: 'main', presence: true, chat: { showHidden: true, steamIds: ['x'], ids: [2] } })
    assert.deepStrictEqual(asked.chat, { showHidden: true, steamIds: ['x'], ids: [2] })
    assert.strictEqual(rows[0].hidden, true)
  })
})