import { ref, computed } from 'vue'
import { nip04 } from 'nostr-tools'
import { relayHubComposable } from './useRelayHub'
import { useAuth } from './useAuth'
import { useMarketStore } from '@/stores/market'
import { decode } from 'light-bolt11-decoder'

// Nostrmarket Order interfaces based on the actual implementation

// Nostrmarket Order interfaces based on the actual implementation
interface OrderItem {
  product_id: string
  quantity: number
}

interface OrderContact {
  nostr?: string
  phone?: string
  email?: string
}

// Direct message types from nostrmarket
enum DirectMessageType {
  PLAIN_TEXT = -1,
  CUSTOMER_ORDER = 0,
  PAYMENT_REQUEST = 1,
  ORDER_PAID_OR_SHIPPED = 2
}

// Event types for nostrmarket protocol
interface CustomerOrderEvent {
  type: DirectMessageType.CUSTOMER_ORDER
  id: string
  items: OrderItem[]
  contact?: OrderContact
  shipping_id: string
  message?: string
}

interface PaymentRequestEvent {
  type: DirectMessageType.PAYMENT_REQUEST
  id: string
  message?: string
  payment_options: Array<{
    type: string
    link: string
  }>
}

interface OrderStatusEvent {
  type: DirectMessageType.ORDER_PAID_OR_SHIPPED
  id: string
  message?: string
  paid?: boolean
  shipped?: boolean
}

// Helper function to extract expiry from bolt11 invoice
function extractExpiryFromBolt11(bolt11String: string): string | undefined {
  try {
    const decoded = decode(bolt11String)
    console.log('Decoded bolt11 invoice:', {
      amount: decoded.sections.find(section => section.name === 'amount')?.value,
      expiry: decoded.expiry,
      timestamp: decoded.sections.find(section => section.name === 'timestamp')?.value
    })
    
    // Calculate expiry date from timestamp + expiry seconds
    const timestamp = decoded.sections.find(section => section.name === 'timestamp')?.value as number
    const expirySeconds = decoded.expiry as number
    
    if (timestamp && expirySeconds) {
      const expiryDate = new Date((timestamp + expirySeconds) * 1000)
      return expiryDate.toISOString()
    }
    
    return undefined
  } catch (error) {
    console.warn('Failed to extract expiry from bolt11:', error)
    return undefined
  }
}

export function useOrderEvents() {
  const relayHub = relayHubComposable
  const auth = useAuth()
  const marketStore = useMarketStore()

  // State
  const isSubscribed = ref(false)
  const lastEventTimestamp = ref(0)
  const processedEventIds = ref(new Set<string>())
  const subscriptionId = ref<string | null>(null)

  // Computed
  const currentUserPubkey = computed(() => auth.currentUser?.value?.pubkey)
  const isReady = computed(() => {
    const isAuth = auth.isAuthenticated
    const isConnected = relayHub.isConnected.value
    const hasPubkey = !!currentUserPubkey.value
    
    return isAuth && isConnected && hasPubkey
  })

  // Subscribe to order events
  const subscribeToOrderEvents = async () => {
    if (!isReady.value || isSubscribed.value) {
      return
    }

    try {
      // Subscribe to direct messages (kind 4) that contain order information
      const filters = [
        {
          kinds: [4], // NIP-04 encrypted direct messages
          '#p': [currentUserPubkey.value].filter(Boolean) as string[],
          since: lastEventTimestamp.value
        }
      ]

      relayHub.subscribe({
        id: 'order-events',
        filters,
        onEvent: handleOrderEvent,
        onEose: () => {
          console.log('Order events subscription ended')
        }
      })

      subscriptionId.value = 'order-events'
      isSubscribed.value = true
      console.log('Successfully subscribed to order events')

    } catch (error) {
      console.error('Failed to subscribe to order events:', error)
    }
  }

  // Handle incoming order events
  const handleOrderEvent = async (event: any) => {
    if (processedEventIds.value.has(event.id)) {
      return
    }

    processedEventIds.value.add(event.id)
    lastEventTimestamp.value = Math.max(lastEventTimestamp.value, event.created_at)

    try {
      // Decrypt the message content
      const decryptedContent = await nip04.decrypt(
        auth.currentUser.value?.prvkey || '',
        event.pubkey,
        event.content
      )

      // Parse the JSON content
      const jsonData = JSON.parse(decryptedContent)
      
      // Handle different message types
      switch (jsonData.type) {
        case DirectMessageType.CUSTOMER_ORDER:
          await handleCustomerOrder(jsonData as CustomerOrderEvent, event.pubkey)
          break
        case DirectMessageType.PAYMENT_REQUEST:
          await handlePaymentRequest(jsonData as PaymentRequestEvent, event.pubkey)
          break
        case DirectMessageType.ORDER_PAID_OR_SHIPPED:
          await handleOrderStatusUpdate(jsonData as OrderStatusEvent, event.pubkey)
          break
        default:
          console.log('Unknown message type:', jsonData.type)
      }
    } catch (error) {
      console.error('Error processing order event:', error)
    }
  }

  // Handle customer order (type 0)
  const handleCustomerOrder = async (orderData: CustomerOrderEvent, _senderPubkey: string) => {
    console.log('Received customer order:', orderData)

    // Create a basic order object from the event data
    const order = {
      id: orderData.id,
      type: DirectMessageType.CUSTOMER_ORDER,
      items: orderData.items,
      contact: orderData.contact,
      shipping_id: orderData.shipping_id,
      message: orderData.message,
      createdAt: Date.now(),
      updatedAt: Date.now()
    }

    // Store the order in our local state
    // Note: We're not using the complex Order interface from market store
    // Instead, we're using the simple nostrmarket format
    console.log('Processed customer order:', order)
  }

  // Handle payment request (type 1)
  const handlePaymentRequest = async (paymentData: PaymentRequestEvent, _senderPubkey: string) => {
    console.log('Received payment request:', paymentData)

    // Find the lightning payment option
    const lightningOption = paymentData.payment_options?.find(opt => opt.type === 'ln')
    if (lightningOption) {
      console.log('Lightning payment request:', lightningOption.link)
      
      // Find the existing order by ID
      const existingOrder = marketStore.orders[paymentData.id]
      if (existingOrder) {
        console.log('Found existing order, updating with payment request:', existingOrder.id)
        
        // Try to extract actual expiry from bolt11
        const actualExpiry = extractExpiryFromBolt11(lightningOption.link)
        
        // Create lightning invoice object
        const lightningInvoice = {
          checking_id: '', // Will be extracted from bolt11 if needed
          payment_hash: '', // Will be extracted from bolt11 if needed
          wallet_id: '', // Not available from payment request
          amount: existingOrder.total,
          fee: 0, // Not available from payment request
          bolt11: lightningOption.link,
          status: 'pending',
          memo: paymentData.message || 'Payment for order',
          created_at: new Date().toISOString(),
          expiry: actualExpiry // Use actual expiry from bolt11 decoding
        }
        
        // Update the order with the lightning invoice
        marketStore.updateOrder(existingOrder.id, {
          lightningInvoice,
          status: 'pending',
          paymentRequest: lightningOption.link,
          updatedAt: Date.now()
        })
        
        console.log('Order updated with payment request:', existingOrder.id)
      } else {
        console.warn('Order not found for payment request:', paymentData.id)
      }
    }
  }

  // Handle order status update (type 2)
  const handleOrderStatusUpdate = async (statusData: OrderStatusEvent, _senderPubkey: string) => {
    console.log('Received order status update:', statusData)

    // Update order status in local state
    if (statusData.paid !== undefined) {
      console.log(`Order ${statusData.id} payment status: ${statusData.paid}`)
    }
    if (statusData.shipped !== undefined) {
      console.log(`Order ${statusData.id} shipping status: ${statusData.shipped}`)
    }
  }

  // Unsubscribe from order events
  const unsubscribeFromOrderEvents = () => {
    if (subscriptionId.value) {
      relayHub.cleanup()
      subscriptionId.value = null
    }
    isSubscribed.value = false
    console.log('Unsubscribed from order events')
  }

  // Watch for ready state changes
  const watchReadyState = () => {
    if (isReady.value && !isSubscribed.value) {
      subscribeToOrderEvents()
    } else if (!isReady.value && isSubscribed.value) {
      unsubscribeFromOrderEvents()
    }
  }

  // Watch for authentication changes
  const watchAuthChanges = () => {
    if (auth.isAuthenticated && relayHub.isConnected.value) {
      subscribeToOrderEvents()
    } else {
      unsubscribeFromOrderEvents()
    }
  }

  // Initialize subscription when ready
  const initialize = () => {
    if (isReady.value) {
      subscribeToOrderEvents()
    }
  }

  // Cleanup
  const cleanup = () => {
    unsubscribeFromOrderEvents()
    processedEventIds.value.clear()
  }

  return {
    // State
    isSubscribed: computed(() => isSubscribed.value),
    isReady: computed(() => isReady.value),
    lastEventTimestamp: computed(() => lastEventTimestamp.value),
    
    // Methods
    subscribeToOrderEvents,
    unsubscribeFromOrderEvents,
    initialize,
    cleanup,
    watchReadyState,
    watchAuthChanges
  }
}