const cors = require('cors')
const express = require('express')

const app = express()
const port = Number(process.argv[2]) || 3001

app.use(cors())
app.use(express.json())

let authenticated = false
let draft = null
const messages = [
  {
    body: 'Welcome to iFruit Mail. Your shared mailbox is ready to use.',
    created_at: '2026-08-04 11:30:00',
    folder: 'inbox',
    id: 1,
    is_read: false,
    message_id: 'b73f3872-54cc-4d74-a058-6caa24f0dfff',
    preview: 'Welcome to iFruit Mail. Your shared mailbox is ready to use.',
    recipients: ['demo@ifruit.com'],
    sender: 'support@ifruit.com',
    subject: 'Welcome to iFruit Mail',
    trashed_at: null,
  },
  {
    body: 'The meet is behind the casino at nine. Bring the blue car.',
    created_at: '2026-08-04 10:15:00',
    folder: 'inbox',
    id: 2,
    is_read: true,
    message_id: '79042d13-f86d-4418-a490-8b558539c20b',
    preview: 'The meet is behind the casino at nine. Bring the blue car.',
    recipients: ['demo@ifruit.com', 'jamie@ifruit.com'],
    sender: 'morgan@ifruit.com',
    subject: 'Tonight',
    trashed_at: null,
  },
  {
    body: 'I will be there.',
    created_at: '2026-08-03 18:05:00',
    folder: 'sent',
    id: 3,
    is_read: true,
    message_id: 'c4414c1e-5fe3-46ea-bc0b-b5b9785c91bd',
    preview: 'I will be there.',
    recipients: ['morgan@ifruit.com'],
    sender: 'demo@ifruit.com',
    subject: 'Re: Tonight',
    trashed_at: null,
  },
  {
    body: 'This is an old message.',
    created_at: '2026-08-02 09:20:00',
    folder: 'inbox',
    id: 4,
    is_read: true,
    message_id: 'd99669ab-c1ac-42d4-8ed4-3c4fe7fa37fb',
    preview: 'This is an old message.',
    recipients: ['demo@ifruit.com'],
    sender: 'news@ifruit.com',
    subject: 'Old mail',
    trashed_at: '2026-08-04 08:00:00',
  },
]

function counts() {
  return {
    drafts: draft ? 1 : 0,
    inbox: messages.filter(
      (item) => item.folder === 'inbox' && !item.trashed_at,
    ).length,
    sent: messages.filter((item) => item.folder === 'sent' && !item.trashed_at)
      .length,
    trash: messages.filter((item) => item.trashed_at).length,
    unread: messages.filter(
      (item) => item.folder === 'inbox' && !item.trashed_at && !item.is_read,
    ).length,
  }
}

app.post('/api/:endpoint', (request, response) => {
  console.log(`[NUI] ${request.params.endpoint}`, request.body)
  const endpoint = request.params.endpoint
  if (endpoint === 'mail:login' || endpoint === 'mail:register') {
    authenticated = true
    response.json({
      success: true,
      data: { counts: counts(), email: 'demo@ifruit.com' },
    })
    return
  }
  if (endpoint === 'mail:logout') {
    authenticated = false
    response.json({ success: true })
    return
  }
  if (endpoint.startsWith('mail:') && !authenticated) {
    response.json({ success: false, error: 'not_authenticated' })
    return
  }
  if (endpoint === 'mail:counts') {
    response.json({ success: true, data: counts() })
    return
  }
  if (endpoint === 'mail:list') {
    const { folder, search = '' } = request.body
    let items =
      folder === 'drafts'
        ? draft
          ? [{ ...draft, created_at: draft.updated_at, preview: draft.body }]
          : []
        : messages.filter((item) =>
            folder === 'trash'
              ? item.trashed_at
              : item.folder === folder && !item.trashed_at,
          )
    const query = String(search).toLowerCase()
    if (query) {
      items = items.filter((item) =>
        `${item.sender ?? ''} ${item.subject} ${item.preview}`
          .toLowerCase()
          .includes(query),
      )
    }
    response.json({ success: true, data: { hasMore: false, items, offset: 0 } })
    return
  }
  if (endpoint === 'mail:get') {
    const message = messages.find((item) => item.id === Number(request.body.id))
    if (message) message.is_read = true
    response.json(
      message
        ? { success: true, data: message }
        : { success: false, error: 'message_not_found' },
    )
    return
  }
  if (endpoint === 'mail:get-draft') {
    response.json(
      draft
        ? { success: true, data: draft }
        : { success: false, error: 'draft_not_found' },
    )
    return
  }
  if (endpoint === 'mail:save-draft') {
    draft = {
      ...request.body,
      id: request.body.id ?? '748836d2-2308-4c21-a4d8-3af6df6dd7eb',
      created_at: '2026-08-04 11:40:00',
      updated_at: '2026-08-04 11:40:00',
    }
    response.json({ success: true, data: { id: draft.id } })
    return
  }
  if (endpoint === 'mail:delete-draft') {
    draft = null
    response.json({ success: true })
    return
  }
  if (endpoint === 'mail:send') {
    draft = null
    response.json({ success: true, data: { id: 'mock-sent-message' } })
    return
  }
  if (endpoint === 'mail:trash' || endpoint === 'mail:restore') {
    const message = messages.find((item) => item.id === Number(request.body.id))
    if (message)
      message.trashed_at =
        endpoint === 'mail:trash' ? '2026-08-04 12:00:00' : null
    response.json({ success: true })
    return
  }
  if (endpoint === 'mail:delete-forever') {
    const index = messages.findIndex(
      (item) => item.id === Number(request.body.id),
    )
    if (index >= 0) messages.splice(index, 1)
    response.json({ success: true })
    return
  }
  if (endpoint === 'mail:empty-trash') {
    for (let index = messages.length - 1; index >= 0; index -= 1) {
      if (messages[index].trashed_at) messages.splice(index, 1)
    }
    response.json({ success: true })
    return
  }
  if (endpoint === 'mail:set-read') {
    const message = messages.find((item) => item.id === Number(request.body.id))
    if (message) message.is_read = request.body.read
    response.json({ success: true })
    return
  }
  response.json({ success: true })
})

app.listen(port, () => {
  console.log(`Mock NUI server listening on http://localhost:${port}`)
})