// Engagement Phase 1b — the change-and-verify flow, at the controller level.
//
// Every model call is monkeypatched, so no query runs. What is under test is the
// DECISION-MAKING, and three properties in particular that no single unit of the
// code enforces on its own:
//
//   1. Requesting a change never touches the live address. The account keeps
//      receiving password-reset mail at the address it had until a link proves the
//      new one. A regression here is silent, and only shows up when somebody
//      cannot recover their account.
//   2. Confirming answers IDENTICALLY for every failure. Expired, already-used,
//      superseded, and "another account verified this address first" are one 404
//      with one message. Any divergence turns the endpoint into an oracle for
//      which addresses hold accounts.
//   3. Changing the address is re-authenticated, with the SSO carve-out.
process.env.DB_HOST = '127.0.0.1'
process.env.DB_PORT = '59999'

const { test, after, beforeEach, afterEach } = require('node:test')
const assert = require('node:assert/strict')

const account = require('../src/router/v1/auth/account.controller')
const verify = require('../src/router/v1/auth/emailVerify.controller')
const users = require('../src/model/users/users.model')
const emailVerifications = require('../src/model/emailVerifications/emailVerifications.model')
const activity = require('../src/model/activity/activity.model')
const mailer = require('../src/utils/mailer')
const db = require('../src/utils/db')

after(() => db.close())

function mockRes() {
  return {
    statusCode: 200,
    body: null,
    status(c) {
      this.statusCode = c
      return this
    },
    json(b) {
      this.body = b
      return this
    },
  }
}

// Restore-on-teardown patching, keyed by owner+name so two modules may each carry
// a function of the same name.
const patched = []
function stub(obj, name, fn) {
  patched.push([obj, name, obj[name]])
  obj[name] = fn
}

let sent
let staged
let promoted

beforeEach(() => {
  sent = []
  staged = []
  promoted = []
  stub(activity, 'log', async () => {})
  stub(mailer, 'sendEmailVerification', async (args) => {
    sent.push(args)
    return { sent: true }
  })
  stub(users, 'setPendingEmail', async (id, email) => {
    staged.push([id, email])
    return 1
  })
  stub(users, 'clearPendingEmail', async () => 1)
  stub(users, 'promotePendingEmail', async (id, email) => {
    promoted.push([id, email])
    return true
  })
  stub(users, 'validatePassword', async (_u, pw) => pw === 'correct-horse')
  stub(emailVerifications, 'sendQuotaExhausted', async () => false)
  stub(emailVerifications, 'invalidatePendingForUser', async () => 0)
  stub(emailVerifications, 'create', async () => ({ id: 1, token: 'tok-abcdefgh' }))
})

afterEach(() => {
  while (patched.length) {
    const [obj, name, fn] = patched.pop()
    obj[name] = fn
  }
})

const reqFor = (body, user = {}) => ({
  body,
  ip: '10.0.0.1',
  user: { id: 7, username: 'alice', ...user },
})

// ── 1. The live address is never touched by a request ──────────────────────

test('requesting a change stages the address and leaves the live one alone', async () => {
  let updateCalled = false
  stub(users, 'update', async () => {
    updateCalled = true
  })
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: 'h', email: 'old@example.com' }))

  const res = mockRes()
  await account.changeEmail(reqFor({ email: 'new@example.com', currentPassword: 'correct-horse' }), res)

  assert.equal(res.statusCode, 200)
  assert.deepEqual(staged, [[7, 'new@example.com']], 'the new address is STAGED')
  assert.equal(updateCalled, false, 'users.update must NOT be called - the live address stands')
  assert.equal(res.body.email_pending, 'new@example.com')
  assert.equal(sent.length, 1, 'a verification mail goes to the address being proved')
  assert.equal(sent[0].to, 'new@example.com')
})

test('the verification link goes to the NEW address, never the old one', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: 'h', email: 'old@example.com' }))
  const res = mockRes()
  await account.changeEmail(reqFor({ email: 'new@example.com', currentPassword: 'correct-horse' }), res)
  assert.equal(sent[0].to, 'new@example.com')
  assert.notEqual(sent[0].to, 'old@example.com')
})

// ── 2. Re-authentication, with the SSO carve-out ───────────────────────────

test('a wrong current password is refused and stages nothing', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: 'h', email: 'old@example.com' }))
  const res = mockRes()
  await account.changeEmail(reqFor({ email: 'new@example.com', currentPassword: 'wrong' }), res)
  assert.equal(res.statusCode, 400)
  assert.deepEqual(staged, [], 'nothing may be staged on a failed re-auth')
  assert.equal(sent.length, 0, 'and no mail may go out')
})

test('an SSO-only account (no password hash) may change its address without one', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: null, email: null }))
  const res = mockRes()
  await account.changeEmail(reqFor({ email: 'first@example.com' }), res)
  assert.equal(res.statusCode, 200, 'the carve-out changePassword already makes, made here too')
  assert.deepEqual(staged, [[7, 'first@example.com']])
})

test('setting the same address again is refused', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: 'h', email: 'Same@Example.com' }))
  const res = mockRes()
  // Compared case-folded, because the uniqueness index folds case: this IS the
  // same mailbox, and staging it would mail the user a link to prove what they
  // have already proved.
  await account.changeEmail(reqFor({ email: 'same@example.com', currentPassword: 'correct-horse' }), res)
  assert.equal(res.statusCode, 400)
  assert.deepEqual(staged, [])
})

// ── 3. Confirming: every failure answers identically ───────────────────────

const INVALID = 'This confirmation link is invalid or has expired.'

test('an unusable link 404s with the generic message', async () => {
  stub(emailVerifications, 'findValidByToken', async () => null)
  const res = mockRes()
  await verify.confirm({ params: { token: 'nope' }, ip: '1.2.3.4' }, res)
  assert.equal(res.statusCode, 404)
  assert.equal(res.body.message, INVALID)
})

test('an address another account verified first answers the SAME 404', async () => {
  stub(emailVerifications, 'findValidByToken', async () => ({ id: 1, user_id: 7, email: 'taken@example.com' }))
  stub(emailVerifications, 'consume', async () => true)
  stub(users, 'promotePendingEmail', async () => {
    const err = new Error("Duplicate entry 'taken@example.com' for key 'uq_users_email_norm'")
    err.code = 'ER_DUP_ENTRY'
    err.errno = 1062
    err.sqlMessage = "Duplicate entry 'taken@example.com' for key 'uq_users_email_norm'"
    throw err
  })
  const res = mockRes()
  await verify.confirm({ params: { token: 'tok' }, ip: '1.2.3.4' }, res)
  assert.equal(res.statusCode, 404, 'not a 409 - that would be an enumeration oracle')
  assert.equal(res.body.message, INVALID, 'byte-identical to an expired link')
})

test('a superseded link answers the SAME 404', async () => {
  stub(emailVerifications, 'findValidByToken', async () => ({ id: 1, user_id: 7, email: 'stale@example.com' }))
  stub(emailVerifications, 'consume', async () => true)
  stub(users, 'promotePendingEmail', async () => false) // the guard rejected it
  const res = mockRes()
  await verify.confirm({ params: { token: 'tok' }, ip: '1.2.3.4' }, res)
  assert.equal(res.statusCode, 404)
  assert.equal(res.body.message, INVALID)
})

test('a link that lost the double-use race answers the SAME 404', async () => {
  stub(emailVerifications, 'findValidByToken', async () => ({ id: 1, user_id: 7, email: 'a@example.com' }))
  stub(emailVerifications, 'consume', async () => false) // someone else consumed it first
  const res = mockRes()
  await verify.confirm({ params: { token: 'tok' }, ip: '1.2.3.4' }, res)
  assert.equal(res.statusCode, 404)
  assert.equal(res.body.message, INVALID)
  assert.deepEqual(promoted, [], 'and must not touch the account')
})

test('a good link installs the address and issues no session', async () => {
  stub(emailVerifications, 'findValidByToken', async () => ({ id: 1, user_id: 7, email: 'good@example.com' }))
  stub(emailVerifications, 'consume', async () => true)
  const res = mockRes()
  await verify.confirm({ params: { token: 'tok' }, ip: '1.2.3.4' }, res)
  assert.equal(res.statusCode, 200)
  assert.equal(res.body.ok, true)
  assert.deepEqual(promoted, [[7, 'good@example.com']])
  // The response carries no token, cookie or user — proving control of a mailbox
  // is not proving control of an account.
  assert.equal(res.body.token, undefined)
  assert.equal(res.body.user, undefined)
})

// ── 4. The send ceiling, and honest reporting when mail is off ─────────────

test('the per-user send ceiling refuses with 429 and sends nothing', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: null, email: null }))
  stub(emailVerifications, 'sendQuotaExhausted', async () => true)
  const res = mockRes()
  await account.changeEmail(reqFor({ email: 'new@example.com' }), res)
  assert.equal(res.statusCode, 429)
  assert.equal(sent.length, 0)
})

test('unconfigured mail is reported honestly, and the address stays staged', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: null, email: null }))
  stub(mailer, 'sendEmailVerification', async () => ({ sent: false, reason: 'NOT_CONFIGURED' }))
  const res = mockRes()
  await account.changeEmail(reqFor({ email: 'new@example.com' }), res)
  assert.equal(res.statusCode, 200)
  assert.equal(res.body.emailed, false)
  assert.equal(res.body.reason, 'NOT_CONFIGURED')
  assert.deepEqual(staged, [[7, 'new@example.com']], 'staged, so a later resend can work')
})

test('resending with nothing pending is a 400, not a mail', async () => {
  stub(users, 'getRawById', async () => ({ id: 7, password_hash: 'h', email: 'a@example.com', email_pending: null }))
  const res = mockRes()
  await account.resendEmailVerification(reqFor({}), res)
  assert.equal(res.statusCode, 400)
  assert.equal(sent.length, 0)
})

test('resending re-sends to the pending address', async () => {
  stub(users, 'getRawById', async () => ({
    id: 7,
    password_hash: 'h',
    email: 'a@example.com',
    email_pending: 'p@example.com',
  }))
  const res = mockRes()
  await account.resendEmailVerification(reqFor({}), res)
  assert.equal(res.statusCode, 200)
  assert.equal(sent.length, 1)
  assert.equal(sent[0].to, 'p@example.com')
})

test('cancelling clears the pending address AND retires its outstanding links', async () => {
  let cleared = false
  let retired = false
  stub(users, 'clearPendingEmail', async () => {
    cleared = true
    return 1
  })
  stub(emailVerifications, 'invalidatePendingForUser', async () => {
    retired = true
    return 1
  })
  const res = mockRes()
  await account.cancelEmailChange(reqFor({}), res)
  assert.equal(res.statusCode, 200)
  assert.equal(cleared, true)
  // Both halves matter: clearing the column alone would leave a link already
  // sitting in a mailbox able to install the address the user just abandoned.
  assert.equal(retired, true, 'outstanding links must be retired too')
})