import { computed, toValue, type MaybeRefOrGetter } from 'vue'
import type { VehicleCardModel } from '@/types/car'

export interface VehicleCardStateOptions {
  vehicle: MaybeRefOrGetter<VehicleCardModel>
}

const stateLabels: Record<string, string> = {
  idle: '空闲',
  running: '运行',
  charging: '充电',
  paused: '暂停',
  fault: '故障',
  offline: '离线'
}

function formatMissionIdSuffix(missionId?: string | number | null): string {
  if (missionId == null) return ''
  const id = String(missionId).trim()
  if (!id || id === '0') return ''
  return `-${id}`
}

function appendMissionId(base: string, missionId?: string | number | null): string {
  const suffix = formatMissionIdSuffix(missionId)
  return suffix ? `${base}${suffix}` : base
}

export function useVehicleCardState(opts: VehicleCardStateOptions) {
  const vehicle = computed(() => toValue(opts.vehicle))

  const stateLabel = computed(() => stateLabels[vehicle.value.state] ?? vehicle.value.state)

  const batteryPct = computed(() => {
    const raw = vehicle.value.batterySoc ?? 0
    const pct = raw > 1 ? raw : raw * 100
    return Math.max(0, Math.min(100, Math.round(pct)))
  })

  const batteryTone = computed(() => {
    const p = batteryPct.value
    if (p < 20) return 'tone-danger'
    if (p < 50) return 'tone-warning'
    return 'tone-success'
  })

  const switchOn = computed(() => vehicle.value.maintenanceMode === 'online')

  const statusPill = computed(() => {
    const v = vehicle.value
    if (v.reachable === false) return { label: '不可达', tone: 'tone-danger' }
    if (v.isAlarmActive) return { label: '报警中', tone: 'tone-danger' }
    if (v.maintenanceMode === 'offline') return { label: '下线维护', tone: 'tone-warning' }
    if (v.maintenanceMode === 'repair') return { label: '现场检修', tone: 'tone-warning' }
    if (v.maintenanceMode === 'blown') return { label: '返厂检修', tone: 'tone-danger' }
    if (v.state === 'fault') return { label: '故障', tone: 'tone-danger' }
    if (v.state === 'running') return { label: '运行中', tone: 'tone-success' }
    if (v.state === 'charging') return { label: '充电中', tone: 'tone-info' }
    if (v.state === 'offline') return { label: '离线', tone: 'tone-idle' }
    return { label: stateLabel.value, tone: 'tone-idle' }
  })

  const missionIdSuffix = computed(() => formatMissionIdSuffix(vehicle.value.missionId))

  const statusDisplayLabel = computed(() =>
    appendMissionId(statusPill.value.label, vehicle.value.missionId)
  )

  const runtimeStatusLabel = computed(() =>
    appendMissionId(vehicle.value.lstatus ?? stateLabel.value, vehicle.value.missionId)
  )

  const accentTone = computed(() => statusPill.value.tone)

  const latencyLabel = computed(() => {
    const ms = vehicle.value.latencyMs
    if (vehicle.value.reachable === false && ms == null) return '不可达'
    if (ms == null) return '—'
    return `${ms} ms`
  })

  const latencyClass = computed(() => {
    const ms = vehicle.value.latencyMs
    if (vehicle.value.reachable === false) return 'val-danger'
    // WatchDog TCP RTT：局域网正常多在几十毫秒；>150 警示，>400 危险
    if (ms != null && ms > 400) return 'val-danger'
    if (ms != null && ms > 150) return 'val-warn'
    return ''
  })

  const faultLabel = computed(() => {
    const v = vehicle.value.faultRatePercent
    if (v == null) return '—'
    return `${v.toFixed(2)}%`
  })

  const faultClass = computed(() => {
    const v = vehicle.value.faultRatePercent ?? 0
    if (v >= 5) return 'val-danger'
    if (v >= 1) return 'val-warn'
    return ''
  })

  const cpuLabel = computed(() => {
    const v = vehicle.value.cpuPercent
    return v != null ? `${Math.round(v)}%` : '—'
  })

  const memLabel = computed(() => {
    const v = vehicle.value.memPercent
    return v != null ? `${Math.round(v)}%` : '—'
  })

  const cpuChipClass = computed(() => {
    const v = vehicle.value.cpuPercent
    if (v == null) return ''
    if (v >= 90) return 'val-danger'
    if (v >= 75) return 'val-warn'
    return 'val-ok'
  })

  const memChipClass = computed(() => {
    const v = vehicle.value.memPercent
    if (v == null) return ''
    if (v >= 90) return 'val-danger'
    if (v >= 75) return 'val-warn'
    return 'val-ok'
  })

  return {
    stateLabel,
    batteryPct,
    batteryTone,
    switchOn,
    statusPill,
    missionIdSuffix,
    statusDisplayLabel,
    runtimeStatusLabel,
    accentTone,
    latencyLabel,
    latencyClass,
    faultLabel,
    faultClass,
    cpuLabel,
    memLabel,
    cpuChipClass,
    memChipClass
  }
}