import { defineStore } from 'pinia'
import { ref } from 'vue'
import { api } from '@/services/request'
import { getTodaySummary, getTrend } from '@/services/health'

interface CachedTrend {
  data: { date: string; value: number }[]
  cachedAt: number
}

interface TodaySummary {
  blood_pressure?: { systolic: number; diastolic: number; status: string; reference_range?: string }
  heart_rate?: { value: number; status: string; reference_range?: string }
  blood_sugar?: { value: number; status: string; reference_range?: string }
  weight?: { value: number; status: string; reference_range?: string }
}

interface HealthThreshold {
  id: string
  indicator: string
  direction: string
  threshold_value: number
  level: string
  is_active: boolean
}

export const DEFAULT_THRESHOLDS: HealthThreshold[] = [
  { id: '_bp_sys_high', indicator: 'systolic_bp', direction: 'high', threshold_value: 140, level: 'warning', is_active: true },
  { id: '_bp_dia_high', indicator: 'diastolic_bp', direction: 'high', threshold_value: 90, level: 'warning', is_active: true },
  { id: '_hr_high', indicator: 'heart_rate', direction: 'high', threshold_value: 100, level: 'warning', is_active: true },
  { id: '_hr_low', indicator: 'heart_rate', direction: 'low', threshold_value: 60, level: 'warning', is_active: true },
  { id: '_bs_fasting_high', indicator: 'blood_sugar_fasting', direction: 'high', threshold_value: 6.1, level: 'warning', is_active: true },
  { id: '_bs_pp_high', indicator: 'blood_sugar_postprandial', direction: 'high', threshold_value: 7.8, level: 'warning', is_active: true },
]

const CACHE_TTL = 5 * 60 * 1000
const TODAY_SUMMARY_TTL = 60_000
const THRESHOLD_CACHE_KEY = 'health_thresholds'
const THRESHOLD_TTL = 24 * 60 * 60 * 1000

export const useHealthStore = defineStore('health', () => {
  const vitals = ref<any[]>([])
  const todaySummary = ref<TodaySummary | null>(null)
  const todaySummaryFetchedAt = ref(0)
  const trendData = ref<Record<string, CachedTrend>>({})
  const thresholds = ref<HealthThreshold[]>(DEFAULT_THRESHOLDS)
  const loading = ref(false)

  async function fetchVitals() {
    loading.value = true
    try {
      const summary = await getTodaySummary()
      vitals.value = summary ? [summary] : []
    } catch { /* ignore */ }
    loading.value = false
  }

  async function refreshToday(force = false) {
    if (!force && todaySummary.value && Date.now() - todaySummaryFetchedAt.value < TODAY_SUMMARY_TTL) return
    loading.value = true
    try {
      const patientId = uni.getStorageSync('current_patient_id') || undefined
      const params: Record<string, string> = {}
      if (patientId) params.patient_id = patientId
      todaySummary.value = await api.get<TodaySummary>('/health/vital-signs/today', params)
      todaySummaryFetchedAt.value = Date.now()
    } catch { /* ignore */ }
    loading.value = false
  }

  async function getTrend(indicator: string, range: string): Promise<{ date: string; value: number }[]> {
    const cacheKey = `${indicator}_${range}`
    const cached = trendData.value[cacheKey]
    if (cached && Date.now() - cached.cachedAt < CACHE_TTL) return cached.data

    try {
      const resp = await api.get<{ data_points: { date: string; value: number }[] }>(
        '/health/vital-signs/trend', { indicator, range },
      )
      const points = resp.data_points || []
      trendData.value = { ...trendData.value, [cacheKey]: { data: points, cachedAt: Date.now() } }
      return points
    } catch { return [] }
  }

  async function fetchThresholds() {
    try {
      const cached = uni.getStorageSync(THRESHOLD_CACHE_KEY) as { data: HealthThreshold[]; ts: number } | undefined
      if (cached && Date.now() - cached.ts < THRESHOLD_TTL) {
        thresholds.value = cached.data
        return
      }
    } catch { /* cache miss */ }

    try {
      const data = await api.get<HealthThreshold[]>('/health/critical-value-thresholds/public')
      uni.setStorageSync(THRESHOLD_CACHE_KEY, { data, ts: Date.now() })
      thresholds.value = data
    } catch { /* keep defaults */ }
  }

  function clearCache() {
    trendData.value = {}
    todaySummary.value = null
    todaySummaryFetchedAt.value = 0
  }

  return {
    vitals, todaySummary, trendData, thresholds, loading,
    fetchVitals, refreshToday, getTrend, fetchThresholds, clearCache,
  }
})