import assert from 'node:assert/strict'
import test from 'node:test'
import {
  encryptEmailPassword,
  fetchEmailMessages,
  sendEmailMessage,
} from '../src/email.js'

const enabled = process.env.RUN_EMAIL_API_E2E === '1'
const baseUrl = process.env.EMAIL_API_E2E_BASE_URL || 'http://127.0.0.1:8088'

function localChannel(account) {
  return {
    account,
    encryptedPassword: encryptEmailPassword('pwd'),
    imapHost: '127.0.0.1',
    imapPort: 3143,
    imapSecure: false,
    imapFolder: 'INBOX',
    smtpHost: '127.0.0.1',
    smtpPort: 3025,
    smtpSecure: false,
    syncDays: 7,
  }
}

function unwrap(payload) {
  return payload && typeof payload === 'object' && 'data' in payload ? payload.data : payload
}

async function request(path, { token, method = 'GET', body } = {}) {
  const response = await fetch(`${baseUrl}${path}`, {
    method,
    headers: {
      'content-type': 'application/json',
      ...(token ? { authorization: `Bearer ${token}` } : {}),
    },
    body: body === undefined ? undefined : JSON.stringify(body),
  })
  const text = await response.text()
  const payload = text ? JSON.parse(text) : null
  if (!response.ok) throw new Error(`${method} ${path} -> ${response.status}: ${payload?.message || text}`)
  return unwrap(payload)
}

async function waitForSenderMessage(predicate) {
  const sender = localChannel('sender@local.test')
  for (let attempt = 0; attempt < 20; attempt += 1) {
    const result = await fetchEmailMessages(sender, { full: true })
    const message = result.messages.find(predicate)
    if (message) return message
    await new Promise((resolve) => setTimeout(resolve, 150))
  }
  throw new Error('等待网关发出的邮件进入 sender IMAP 超时')
}

test('真实 HTTP 网关完成 Email 连接、全量同步、附件读取、回复与已读', { skip: !enabled }, async () => {
  process.env.JWT_SECRET ||= 'lingxi-email-api-e2e-secret'
  const suffix = Date.now()
  const senderChannel = localChannel('sender@local.test')
  const olderSubject = `Lingxi sorting older ${suffix}`
  const newerSubject = `Lingxi sorting newer ${suffix}`
  await sendEmailMessage(senderChannel, {
    to: 'receiver@local.test',
    subject: olderSubject,
    text: 'Older conversation used for stable ordering',
  })
  await new Promise((resolve) => setTimeout(resolve, 30))
  await sendEmailMessage(senderChannel, {
    to: 'receiver@local.test',
    subject: newerSubject,
    text: 'Newer conversation must remain above the opened older conversation',
  })

  const session = await request('/api/auth/register', {
    method: 'POST',
    body: {
      name: 'Email API E2E',
      account: `email-api-${suffix}@local.test`,
      password: 'Lingxi-Email-Api-2026!',
      company: 'Lingxi Protocol Lab',
      industry: '跨境电商',
      teamSize: '1-10人',
    },
  })
  assert.ok(session.token)

  const connected = await request('/api/channels/email/connect', {
    token: session.token,
    method: 'POST',
    body: {
      name: '本地协议邮箱',
      displayName: 'Lingxi Receiver',
      account: 'receiver@local.test',
      password: 'pwd',
      imapHost: 'host.docker.internal',
      imapPort: 3143,
      imapSecure: false,
      imapFolder: 'INBOX',
      smtpHost: 'host.docker.internal',
      smtpPort: 3025,
      smtpSecure: false,
      syncDays: 7,
    },
  })
  assert.equal(connected.status, 'connected')
  assert.equal(connected.encryptedPassword, undefined)

  const conversations = await request('/api/conversations?channel=email', { token: session.token })
  assert.ok(conversations.list.length >= 2)
  const newerConversation = conversations.list.find((item) => item.emailSubject === newerSubject)
  const olderConversation = conversations.list.find((item) => item.emailSubject === olderSubject)
  assert.ok(newerConversation)
  assert.ok(olderConversation)
  assert.ok(conversations.list.indexOf(newerConversation) < conversations.list.indexOf(olderConversation))

  const olderMessages = await request(`/api/conversations/${olderConversation.id}/messages`, { token: session.token })
  await request(`/api/conversations/${olderConversation.id}/read`, {
    token: session.token,
    method: 'POST',
    body: { messageIds: olderMessages.map((message) => message.id) },
  })
  const afterRead = await request('/api/conversations?channel=email', { token: session.token })
  const relevantOrder = afterRead.list
    .filter((item) => [newerConversation.id, olderConversation.id].includes(item.id))
    .map((item) => item.id)
  assert.deepEqual(relevantOrder, [newerConversation.id, olderConversation.id])

  let conversation
  let incoming
  for (const candidate of conversations.list.filter((item) => item.customer?.email === 'sender@local.test')) {
    const candidateMessages = await request(`/api/conversations/${candidate.id}/messages`, { token: session.token })
    const candidateIncoming = candidateMessages.find((message) => message.sender === 'customer' && message.emailAttachments?.length)
    if (candidateIncoming) {
      conversation = candidate
      incoming = candidateIncoming
      break
    }
  }
  assert.ok(conversation)
  assert.ok(incoming)
  const attachment = await request(
    `/api/conversations/${conversation.id}/messages/${incoming.id}/attachment?attachmentId=${encodeURIComponent(incoming.emailAttachments[0].id)}`,
    { token: session.token },
  )
  assert.equal(attachment.name, 'lingxi-proof.txt')
  assert.ok(attachment.dataUrl.startsWith('data:text/plain;base64,'))

  const replyText = `Lingxi gateway API reply ${suffix}`
  const sent = await request(`/api/conversations/${conversation.id}/messages`, {
    token: session.token,
    method: 'POST',
    body: { text: replyText, autoTranslate: false },
  })
  assert.equal(sent.status, 'sent')
  assert.ok(sent.emailMessageId)

  const receivedBySender = await waitForSenderMessage((message) => message.messageId === sent.emailMessageId)
  assert.equal(receivedBySender.text, replyText)
  assert.ok(receivedBySender.inReplyTo)

  await request(`/api/conversations/${conversation.id}/read`, {
    token: session.token,
    method: 'POST',
    body: { messageIds: [incoming.id] },
  })
  const receiver = await fetchEmailMessages(localChannel('receiver@local.test'), { full: true })
  assert.equal(receiver.messages.find((message) => message.uid === incoming.emailUid)?.seen, true)
})