// ── The permission mirror ─────────────────────────────────────────────────
//
// The whole of R2's correctness is three set operations and one rule about what
// counts as landed, and every test here is one of those:
//
//   desired − pushed   apply
//   pushed  − desired  RETIRE, because the site put it there and withdrew it
//   present − desired  drift, which is reported and never undone
//
//   and: a grant naming a permission the server has not registered did NOT land,
//   however much the push looked like it worked.
//
// The last one is the one with teeth. `GrantUserPermission` returns void, throws
// nothing and logs nothing for an unregistered name (PLAN.md §12.2 rule 1), so a
// module that recorded it as pushed would believe it had given a privilege it had
// not — and would then RETIRE it from a server that never had it, which is a
// no-op that reads as a success in every log.

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

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

function withCore(overrides = {}) {
  const queries = []

  require('../core')._reset()
  require('../core').init(
    fakeCtx({
      db: {
        query: (sql, params) => {
          queries.push({ sql: sql.trim().replace(/\s+/g, ' '), params })
          const verb = sql.trim().split(/\s+/)[0].toUpperCase()
          if (verb === 'SELECT') return Promise.resolve([])
          return Promise.resolve({ affectedRows: 1 })
        },
        pool: {},
      },
      ...overrides,
    }),
  )

  return queries
}

/** One authored set: a fleet group, a server-scoped group, and two grants. */
function authored() {
  return {
    groups: [
      { name: 'vip', title: 'VIP', rank: 10, scope: '*' },
      { name: 'builder', title: 'Builder', rank: 0, scope: 'creative' },
    ],
    groupPermissions: [
      { groupName: 'vip', permission: 'kits.vip' },
      { groupName: 'builder', permission: 'buildtools.use' },
    ],
    members: [
      { groupName: 'vip', userId: 1 },
      { groupName: 'builder', userId: 2 },
    ],
    grants: [
      { id: 1, userId: 1, permission: 'kits.gold', scope: '*', steamId: '7656001' },
      { id: 2, userId: 3, permission: 'kits.gold', scope: '*', steamId: null },
      { id: 3, userId: 2, permission: 'zonemanager.admin', scope: 'creative', steamId: '7656002' },
    ],
    // One person with TWO Steam accounts, one with one, one with none.
    steamIdsByUser: new Map([
      [1, ['7656001', '7656099']],
      [2, ['7656002']],
    ]),
  }
}

test('a grant reaches every Steam account its holder has linked (D28)', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const { payload } = model.buildDesired('main', authored())
  const holders = payload.grants.map((row) => row.steamId).sort()

  // `kits.gold` is authored once, against user 1, who holds two accounts.
  assert.deepEqual(holders, ['7656001', '7656099'])
  for (const row of payload.grants) assert.deepEqual(row.permissions, ['kits.gold'])
})

test('a holder who has linked nothing contributes to the namespace but reaches nobody', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const { payload, rows } = model.buildDesired('main', authored())

  // User 3 holds `kits.gold` and has no account. Nothing is pushed for them…
  assert.ok(!rows.some((row) => row.kind === 'grant' && row.subject === null))
  // …and the permission is still MANAGED, which is what makes a hand grant of it
  // to somebody else show up as drift rather than as nothing at all.
  assert.ok(payload.managed.includes('kits.gold'))
})

test('scope decides what a server is sent at all (D29)', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const main = model.buildDesired('main', authored())
  const creative = model.buildDesired('creative', authored())

  assert.deepEqual(main.payload.groups.map((g) => g.name), ['vip'])
  assert.deepEqual(creative.payload.groups.map((g) => g.name).sort(), ['builder', 'vip'])

  // The server-scoped grant is on `creative` and nowhere else.
  assert.ok(!main.payload.managed.includes('zonemanager.admin'))
  assert.ok(creative.payload.managed.includes('zonemanager.admin'))
})

test('a group travels as a group: its members and its permissions are separate facts (D30)', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const { payload, rows } = model.buildDesired('main', authored())
  const vip = payload.groups.find((group) => group.name === 'vip')

  assert.deepEqual(vip.permissions, ['kits.vip'])
  assert.deepEqual(vip.members.sort(), ['7656001', '7656099'])

  // Three distinct row kinds, because the game can fail at each independently: a
  // group can exist while a membership does not, which is exactly what happens
  // for a player the store has never seen.
  assert.ok(rows.some((r) => r.kind === 'group' && r.subject === 'vip'))
  assert.ok(rows.some((r) => r.kind === 'group-permission' && r.object === 'kits.vip'))
  assert.ok(rows.some((r) => r.kind === 'member' && r.object === 'vip'))
})

test('the digest does not depend on the order rows came out of the database', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const rows = model.buildDesired('main', authored()).rows
  const shuffled = [...rows].reverse()

  // An unsorted digest would differ between two reads of an unchanged set, and
  // the loop would push to every game server on every tick for ever.
  assert.equal(model.hashRows(rows), model.hashRows(shuffled))
  assert.notEqual(model.hashRows(rows), model.hashRows(rows.slice(1)))
})

test('what this site put there and has withdrawn is the only thing retired (D31)', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const desired = [
    { kind: 'grant', subject: '7656001', object: 'kits.gold' },
    { kind: 'member', subject: '7656001', object: 'vip' },
  ]

  const pushed = [
    { kind: 'grant', subject: '7656001', object: 'kits.gold' }, // still wanted
    { kind: 'grant', subject: '7656001', object: 'kits.silver' }, // withdrawn
  ]

  assert.deepEqual(model.retirements(pushed, desired), [
    { kind: 'grant', subject: '7656001', object: 'kits.silver' },
  ])

  // A hand grant is in NEITHER set, so it is never retired by this calculation —
  // it reaches the operator as drift instead. That difference is the reason the
  // pushed ledger exists at all.
  assert.deepEqual(model.retirements([], desired), [])
})

test('a permission the server could not resolve is not recorded as pushed', async () => {
  const queries = withCore()
  const permSync = require('../permSync')

  const desired = {
    hash: 'h1',
    rows: [
      { kind: 'grant', subject: '7656001', object: 'kits.gold' },
      { kind: 'grant', subject: '7656001', object: 'kits.vip' },
      { kind: 'member', subject: '7656002', object: 'vip' },
      { kind: 'member', subject: '7656003', object: 'vip' },
    ],
  }

  const report = {
    kind: 'perm.report',
    applied: { grants: 1 },
    unresolved: ['kits.vip'],
    pending: ['7656003:vip'],
    foreign: [],
  }

  // The catalogue refresh is a second call to the game; stubbed so the report
  // path is what this test is about.
  const sidecar = require('../sidecarClient')
  sidecar.permCatalogue = async () => ({ ok: false, status: 'no-token', data: null })

  await permSync.applyReport({ id: 'main' }, { desired, retire: [], report, bootId: null, wipeId: null })

  const insert = queries.find((q) => q.sql.startsWith('INSERT IGNORE INTO rust_perm_pushed'))
  assert.ok(insert, 'the rows that landed must be recorded')

  const recorded = insert.params.join(' ')
  assert.ok(recorded.includes('kits.gold'), 'a grant that landed is pushed')
  assert.ok(!recorded.includes('kits.vip'), 'an unresolved permission never reached the store')
  assert.ok(recorded.includes('7656002'), 'a membership that took is pushed')
  assert.ok(!recorded.includes('7656003'), 'a pending membership is not in the game yet')
})

test('a restart, a wipe and a hand edit each provoke a sync; a quiet server does not', () => {
  withCore()
  const permSync = require('../permSync')

  const base = {
    state: 'ok',
    dirty: false,
    syncedHash: 'h1',
    bootId: 'boot-1',
    wipeId: 'w-1',
    lastAttemptAt: new Date(),
  }

  const at = (sync, state = {}) =>
    permSync.reasonToSync({
      desiredHash: 'h1',
      sync,
      state: { bootId: 'boot-1', wipeId: 'w-1', ...state },
      force: false,
    })

  assert.equal(at(base), null, 'nothing changed: no push')
  assert.equal(at({ ...base, dirty: true }), 'dirty')
  assert.equal(permSync.reasonToSync({ desiredHash: 'h2', sync: base, state: {}, force: false }), 'changed')
  assert.equal(at(base, { bootId: 'boot-2' }), 'restart')
  assert.equal(at(base, { wipeId: 'w-2' }), 'wipe')
  assert.equal(at(null), 'first')

  // The audit is the backstop that finds drift on a server nobody has touched.
  const old = new Date(Date.now() - permSync.AUDIT_MS - 1000)
  assert.equal(at({ ...base, lastAttemptAt: old }), 'audit')
})

test('a failing server is left alone for a backoff, unless something changed', () => {
  withCore()
  const permSync = require('../permSync')

  const failing = {
    state: 'failed',
    dirty: false,
    syncedHash: 'h1',
    lastAttemptAt: new Date(),
  }

  assert.equal(
    permSync.reasonToSync({ desiredHash: 'h1', sync: failing, state: {}, force: false }),
    null,
    'a server that just failed is not hammered every thirty seconds',
  )

  assert.equal(
    permSync.reasonToSync({ desiredHash: 'h1', sync: { ...failing, dirty: true }, state: {}, force: false }),
    'retry',
    'an operator changing something is a reason to try again at once',
  )

  const older = new Date(Date.now() - permSync.FAIL_BACKOFF_MS - 1000)
  assert.equal(
    permSync.reasonToSync({ desiredHash: 'h1', sync: { ...failing, lastAttemptAt: older }, state: {}, force: false }),
    'retry',
  )
})

test('names are lowered, because the store lowers them', () => {
  withCore()
  const model = require('../model/permissions/permissions.model')

  const set = {
    ...authored(),
    grants: [{ id: 9, userId: 1, permission: 'Kits.GOLD', scope: '*', steamId: '7656001' }],
  }

  const { payload } = model.buildDesired('main', set)

  // Pushed as `kits.gold`, read back as `kits.gold`. Unlowered, the site would
  // push one name, find another, and report its own grant as drift for ever.
  assert.deepEqual(payload.grants[0].permissions, ['kits.gold'])
})