import { mkdtempSync, rmSync, writeFileSync } from 'fs'
import os from 'os'
import path from 'path'
import {
  classifyPublicTrafficPurpose,
  getPublicTrafficPresetRange,
  getPublicTrafficStats,
  normalizeTrafficRange,
  parsePublicTrafficLogLine,
} from '@/lib/public-traffic-stats'

describe('public traffic stats', () => {
  test('parses standard nginx access log response bytes', () => {
    const line =
      '58.216.227.194 - - [04/Jul/2026:10:35:05 +0800] "POST /api/dingtalk/login HTTP/2.0" 200 349 "https://sc.jiansun.vip/dingtalk-callback" "Mozilla/5.0"'

    const entry = parsePublicTrafficLogLine(line, 'sc.jiansun.vip')

    expect(entry).toEqual(
      expect.objectContaining({
        domain: 'sc.jiansun.vip',
        remoteAddress: '58.216.227.194',
        method: 'POST',
        path: '/api/dingtalk/login',
        status: 200,
        responseBytes: 349,
        requestBytes: null,
      }),
    )
    expect(entry?.timestamp.toISOString()).toBe('2026-07-04T02:35:05.000Z')
  })

  test('parses extended request_length when present', () => {
    const line =
      '58.216.227.194 - - [04/Jul/2026:10:42:52 +0800] "GET /api/materials/download?id=abc HTTP/1.1" 200 1024 "-" "curl" bytes_sent=1200 request_length=512'

    const entry = parsePublicTrafficLogLine(line, 'sc.jiansun.vip')

    expect(entry).toEqual(
      expect.objectContaining({
        method: 'GET',
        path: '/api/materials/download',
        responseBytes: 1200,
        requestBytes: 512,
      }),
    )
  })

  test('normalizes default range to whole local days', () => {
    const range = normalizeTrafficRange('2026-07-01', '2026-07-04')

    expect(range.start.toISOString()).toBe('2026-06-30T16:00:00.000Z')
    expect(range.end.toISOString()).toBe('2026-07-04T15:59:59.999Z')
  })

  test('builds public traffic presets using China business dates', () => {
    const now = new Date('2026-07-08T05:00:00.000Z')
    const today = getPublicTrafficPresetRange('today', now)
    const last7 = getPublicTrafficPresetRange('last7', now)
    const last30 = getPublicTrafficPresetRange('last30', now)

    expect(today.start.toISOString()).toBe('2026-07-07T16:00:00.000Z')
    expect(today.end.toISOString()).toBe('2026-07-08T15:59:59.999Z')
    expect(last7.start.toISOString()).toBe('2026-07-01T16:00:00.000Z')
    expect(last7.end.toISOString()).toBe('2026-07-08T15:59:59.999Z')
    expect(last30.start.toISOString()).toBe('2026-06-08T16:00:00.000Z')
    expect(last30.end.toISOString()).toBe('2026-07-08T15:59:59.999Z')
  })

  test('groups daily traffic by China business date', async () => {
    const previousPaths = process.env.PUBLIC_TRAFFIC_LOG_PATHS
    const tempDir = mkdtempSync(path.join(os.tmpdir(), 'public-traffic-'))
    const logPath = path.join(tempDir, 'sc.jiansun.vip.access.log')

    try {
      writeFileSync(
        logPath,
        '58.216.227.194 - - [04/Jul/2026:01:35:05 +0800] "GET /assets/a.png HTTP/2.0" 200 2048 "-" "Mozilla/5.0"\n',
      )
      process.env.PUBLIC_TRAFFIC_LOG_PATHS = logPath

      const stats = await getPublicTrafficStats(normalizeTrafficRange('2026-07-04', '2026-07-04'))

      expect(stats.byDay).toEqual([
        expect.objectContaining({
          date: '2026-07-04',
          responseBytes: 2048,
          totalRequests: 1,
        }),
      ])
      expect(stats.byPurpose).toEqual([
        expect.objectContaining({
          key: 'static-asset',
          label: '图片直链访问',
          category: '资源文件',
        }),
      ])
    } finally {
      if (previousPaths === undefined) {
        delete process.env.PUBLIC_TRAFFIC_LOG_PATHS
      } else {
        process.env.PUBLIC_TRAFFIC_LOG_PATHS = previousPaths
      }
      rmSync(tempDir, { recursive: true, force: true })
    }
  })

  test('classifies technical paths into human-readable business purposes', () => {
    expect(classifyPublicTrafficPurpose('sc.jiansun.vip', '/api/materials/download', 'GET')).toEqual(
      expect.objectContaining({
        key: 'material-download',
        label: '素材下载/打包下载',
      }),
    )

    expect(classifyPublicTrafficPurpose('cp.jiansun.vip', '/api/intake/non-integrated', 'GET')).toEqual(
      expect.objectContaining({
        key: 'product-intake-non-integrated',
        label: '产品设计平台未集成素材列表',
      }),
    )

    expect(
      classifyPublicTrafficPurpose(
        's3.jiansun.vip',
        '/gongxiangpan/uploads/direct/d685fa51-d8eb-42ea-b471-4a91269a7a90/1783137399966-p0j9wv.jpg',
        'GET',
      ),
    ).toEqual(
      expect.objectContaining({
        key: 'direct-upload-asset',
        label: '图片直链访问',
        category: '直传资源',
        detail: '直传上传目录下的图片、视频、压缩包等资源直链汇总，具体文件请看“流量最高路径”。',
      }),
    )

    expect(classifyPublicTrafficPurpose('s3.jiansun.vip', '/gongxiangpan/uploads/1775120618610-g75pxl.png', 'GET')).toEqual(
      expect.objectContaining({
        key: 'legacy-upload-asset',
        label: '图片直链访问',
        category: '历史上传资源',
        detail: '历史上传目录下的图片、视频、压缩包等资源直链汇总，具体文件请看“流量最高路径”。',
      }),
    )
  })
})