import { reactive } from 'vue'
import { StatsService } from '@/services'
import type { DashboardViewData } from '@/types'
import { formatFileSize } from '@/utils/common'

const emptyDashboardData = (): DashboardViewData => ({
  hasExtendedStats: false,
  totalFiles: 0,
  storageUsed: 0,
  yesterdayCount: 0,
  todayCount: 0,
  yesterdaySize: 0,
  todaySize: 0,
  sysUptime: null,
  activeCount: 0,
  expiredCount: 0,
  textCount: 0,
  fileCount: 0,
  chunkedCount: 0,
  usedCount: 0,
  storageBackend: '-',
  uploadSizeLimit: 0,
  openUpload: 0,
  enableChunk: 0,
  maxSaveSeconds: 0,
  topSuffixes: [],
  recentFiles: [],
  storageUsedText: '0 Bytes',
  yesterdaySizeText: '0 Bytes',
  todaySizeText: '0 Bytes',
  uploadSizeLimitText: '0 Bytes',
  sysUptimeText: '-',
  activeRatio: 0,
  textRatio: 0,
  fileRatio: 0,
  todaySizeRatio: 0
})

const toNumber = (value: number | string | null | undefined) => Number(value || 0)

const clampRatio = (value: number) => Math.max(0, Math.min(100, Math.round(value)))

const hasOwn = (target: object, key: string) => Object.prototype.hasOwnProperty.call(target, key)

const formatDuration = (startTimestamp: number | null) => {
  if (!startTimestamp) return '-'
  const uptime = Date.now() - startTimestamp
  const days = Math.floor(uptime / (24 * 60 * 60 * 1000))
  const hours = Math.floor((uptime % (24 * 60 * 60 * 1000)) / (60 * 60 * 1000))
  return `${days}天${hours}小时`
}

export function useDashboardStats() {
  const dashboardData = reactive<DashboardViewData>(emptyDashboardData())

  const fetchDashboardData = async () => {
    const response = await StatsService.getDashboard()
    if (!response.detail) return

    const detail = response.detail
    dashboardData.totalFiles = toNumber(detail.totalFiles)
    dashboardData.storageUsed = toNumber(detail.storageUsed)
    dashboardData.yesterdayCount = toNumber(detail.yesterdayCount)
    dashboardData.todayCount = toNumber(detail.todayCount)
    dashboardData.yesterdaySize = toNumber(detail.yesterdaySize)
    dashboardData.todaySize = toNumber(detail.todaySize)
    dashboardData.sysUptime = detail.sysUptime
    dashboardData.hasExtendedStats = hasOwn(detail, 'activeCount')
    dashboardData.activeCount = dashboardData.hasExtendedStats
      ? toNumber(detail.activeCount)
      : dashboardData.totalFiles
    dashboardData.expiredCount = toNumber(detail.expiredCount)
    dashboardData.textCount = toNumber(detail.textCount)
    dashboardData.fileCount = toNumber(detail.fileCount)
    dashboardData.chunkedCount = toNumber(detail.chunkedCount)
    dashboardData.usedCount = toNumber(detail.usedCount)
    dashboardData.storageBackend = detail.storageBackend || '-'
    dashboardData.uploadSizeLimit = toNumber(detail.uploadSizeLimit)
    dashboardData.openUpload = toNumber(detail.openUpload)
    dashboardData.enableChunk = toNumber(detail.enableChunk)
    dashboardData.maxSaveSeconds = toNumber(detail.maxSaveSeconds)
    dashboardData.topSuffixes = detail.topSuffixes || []
    dashboardData.recentFiles = detail.recentFiles || []

    dashboardData.storageUsedText = formatFileSize(dashboardData.storageUsed)
    dashboardData.yesterdaySizeText = formatFileSize(dashboardData.yesterdaySize)
    dashboardData.todaySizeText = formatFileSize(dashboardData.todaySize)
    dashboardData.uploadSizeLimitText = formatFileSize(dashboardData.uploadSizeLimit)
    dashboardData.sysUptimeText = formatDuration(dashboardData.sysUptime)
    dashboardData.activeRatio = dashboardData.totalFiles
      ? clampRatio((dashboardData.activeCount / dashboardData.totalFiles) * 100)
      : 0
    dashboardData.textRatio = dashboardData.totalFiles
      ? clampRatio((dashboardData.textCount / dashboardData.totalFiles) * 100)
      : 0
    dashboardData.fileRatio = dashboardData.totalFiles
      ? clampRatio((dashboardData.fileCount / dashboardData.totalFiles) * 100)
      : 0
    dashboardData.todaySizeRatio = dashboardData.uploadSizeLimit
      ? clampRatio((dashboardData.todaySize / dashboardData.uploadSizeLimit) * 100)
      : 0
  }

  return {
    dashboardData,
    fetchDashboardData
  }
}