/**
 * Store Synchronization Composable
 * 
 * Ensures that the legacy stores (streams, members, policies) always stay
 * synchronized with the new CoopBuilderStore. This makes the setup interface
 * the single source of truth while maintaining backward compatibility.
 */

export const useStoreSync = () => {
  const coopStore = useCoopBuilderStore()
  const streamsStore = useStreamsStore()
  const membersStore = useMembersStore()
  const policiesStore = usePoliciesStore()

  // Flags to prevent recursive syncing and duplicate watchers
  let isSyncing = false
  let watchersSetup = false

  // Sync CoopBuilder -> Legacy Stores
  const syncToLegacyStores = () => {
    if (isSyncing) return
    isSyncing = true
    // Sync streams
    streamsStore.resetStreams()
    coopStore.streams.forEach((stream: any) => {
      streamsStore.upsertStream({
        id: stream.id,
        name: stream.label,
        category: stream.category || 'services',
        targetMonthlyAmount: stream.monthly,
        certainty: stream.certainty || 'Probable',
        payoutDelayDays: 30,
        terms: 'Net 30',
        targetPct: 0,
        revenueSharePct: 0,
        platformFeePct: 0,
        restrictions: 'General',
        seasonalityWeights: new Array(12).fill(1),
        effortHoursPerMonth: 0
      })
    })

    // Sync members
    membersStore.resetMembers()
    coopStore.members.forEach((member: any) => {
      membersStore.upsertMember({
        id: member.id,
        displayName: member.name,
        role: member.role || '',
        hoursPerWeek: Math.round((member.hoursPerMonth || 0) / 4.33),
        minMonthlyNeeds: member.minMonthlyNeeds || 0,
        monthlyPayPlanned: member.monthlyPayPlanned || 0,
        targetMonthlyPay: member.targetMonthlyPay || 0,
        externalMonthlyIncome: member.externalMonthlyIncome || 0
      })
    })

    // Sync policies - using individual update calls based on store structure
    policiesStore.updatePolicy('equalHourlyWage', coopStore.equalHourlyWage)
    policiesStore.updatePolicy('payrollOncostPct', coopStore.payrollOncostPct)
    policiesStore.updatePolicy('savingsTargetMonths', coopStore.savingsTargetMonths)
    policiesStore.updatePolicy('minCashCushionAmount', coopStore.minCashCushion)
    
    // Reset flag after sync completes
    nextTick(() => {
      isSyncing = false
    })
  }

  // Sync Legacy Stores -> CoopBuilder
  const syncFromLegacyStores = () => {
    if (isSyncing) return
    isSyncing = true
    // Sync streams from legacy store
    streamsStore.streams.forEach((stream: any) => {
      coopStore.upsertStream({
        id: stream.id,
        label: stream.name,
        monthly: stream.targetMonthlyAmount,
        category: stream.category,
        certainty: stream.certainty
      })
    })

    // Sync members from legacy store
    membersStore.members.forEach((member: any) => {
      coopStore.upsertMember({
        id: member.id,
        name: member.displayName,
        role: member.role,
        hoursPerMonth: Math.round((member.hoursPerWeek || 0) * 4.33),
        minMonthlyNeeds: member.minMonthlyNeeds,
        monthlyPayPlanned: member.monthlyPayPlanned,
        targetMonthlyPay: member.targetMonthlyPay,
        externalMonthlyIncome: member.externalMonthlyIncome
      })
    })

    // Sync policies from legacy store
    if (policiesStore.isValid) {
      coopStore.setEqualWage(policiesStore.equalHourlyWage)
      coopStore.setOncostPct(policiesStore.payrollOncostPct)
      coopStore.savingsTargetMonths = policiesStore.savingsTargetMonths
      coopStore.minCashCushion = policiesStore.minCashCushionAmount
      if (policiesStore.payPolicy?.relationship) {
        coopStore.setPolicy(policiesStore.payPolicy.relationship as any)
      }
    }
    
    // Reset flag after sync completes
    nextTick(() => {
      isSyncing = false
    })
  }

  // Watch for changes in CoopBuilder and sync to legacy stores
  const setupCoopBuilderWatchers = () => {
    // Watch streams changes
    watch(() => coopStore.streams, () => {
      if (!isSyncing) {
        syncToLegacyStores()
      }
    }, { deep: true })

    // Watch members changes
    watch(() => coopStore.members, () => {
      if (!isSyncing) {
        syncToLegacyStores()
      }
    }, { deep: true })

    // Watch policy changes
    watch(() => [
      coopStore.equalHourlyWage,
      coopStore.payrollOncostPct,
      coopStore.savingsTargetMonths,
      coopStore.minCashCushion,
      coopStore.currency,
      coopStore.policy.relationship
    ], () => {
      if (!isSyncing) {
        syncToLegacyStores()
      }
    })
  }

  // Watch for changes in legacy stores and sync to CoopBuilder
  const setupLegacyStoreWatchers = () => {
    // Watch streams store changes
    watch(() => streamsStore.streams, () => {
      if (!isSyncing) {
        syncFromLegacyStores()
      }
    }, { deep: true })

    // Watch members store changes
    watch(() => membersStore.members, () => {
      if (!isSyncing) {
        syncFromLegacyStores()
      }
    }, { deep: true })

    // Watch policies store changes
    watch(() => [
      policiesStore.equalHourlyWage,
      policiesStore.payrollOncostPct,
      policiesStore.savingsTargetMonths,
      policiesStore.minCashCushionAmount,
      policiesStore.payPolicy?.relationship
    ], () => {
      if (!isSyncing) {
        syncFromLegacyStores()
      }
    })
  }

  // Initialize synchronization
  const initSync = async () => {
    // Wait for next tick to ensure stores are mounted
    await nextTick()
    
    // Force store hydration by accessing $state
    if (coopStore.$state) {
      console.log('🔄 CoopBuilder store hydrated')
    }
    
    // Small delay to ensure localStorage is loaded
    await new Promise(resolve => setTimeout(resolve, 10))
    
    // Determine which store has data and sync accordingly
    const coopHasData = coopStore.members.length > 0 || coopStore.streams.length > 0
    const legacyHasData = streamsStore.streams.length > 0 || membersStore.members.length > 0

    console.log('🔄 InitSync: CoopBuilder data:', coopHasData, 'Legacy data:', legacyHasData)
    console.log('🔄 CoopBuilder members:', coopStore.members.length, 'streams:', coopStore.streams.length)
    console.log('🔄 Legacy members:', membersStore.members.length, 'streams:', streamsStore.streams.length)

    if (coopHasData && !legacyHasData) {
      console.log('🔄 Syncing CoopBuilder → Legacy')
      syncToLegacyStores()
    } else if (legacyHasData && !coopHasData) {
      console.log('🔄 Syncing Legacy → CoopBuilder')
      syncFromLegacyStores()
    } else if (coopHasData && legacyHasData) {
      console.log('🔄 Both have data, keeping in sync')
      // Both have data, ensure consistency by syncing from CoopBuilder (primary source)
      syncToLegacyStores()
    } else {
      console.log('🔄 No data in either store')
    }

    // Set up watchers for ongoing sync (only once)
    if (!watchersSetup) {
      setupCoopBuilderWatchers()
      setupLegacyStoreWatchers()
      watchersSetup = true
    }
    
    // Return promise to allow awaiting
    return Promise.resolve()
  }

  // Get unified streams data (prioritize CoopBuilder) - make reactive
  const unifiedStreams = computed(() => {
    if (coopStore.streams.length > 0) {
      return coopStore.streams.map(stream => ({
        ...stream,
        name: stream.label,
        targetMonthlyAmount: stream.monthly
      }))
    }
    return streamsStore.streams
  })

  // Get unified members data (prioritize CoopBuilder) - make reactive
  const unifiedMembers = computed(() => {
    if (coopStore.members.length > 0) {
      return coopStore.members.map(member => ({
        ...member,
        displayName: member.name,
        hoursPerWeek: Math.round((member.hoursPerMonth || 0) / 4.33)
      }))
    }
    return membersStore.members
  })

  // Getter functions for backward compatibility
  const getStreams = () => unifiedStreams.value
  const getMembers = () => unifiedMembers.value

  return {
    syncToLegacyStores,
    syncFromLegacyStores,
    initSync,
    getStreams,
    getMembers,
    unifiedStreams,
    unifiedMembers
  }
}