// HelcimPay.js integration composable
export const useHelcimPay = () => {
  let checkoutToken = null
  let secretToken = null
  
  // Initialize HelcimPay.js session
  const initializeHelcimPay = async (customerId, customerCode, amount = 0) => {
    try {
      const response = await $fetch('/api/helcim/initialize-payment', {
        method: 'POST',
        body: {
          customerId,
          customerCode,
          amount
        }
      })
      
      if (response.success) {
        checkoutToken = response.checkoutToken
        secretToken = response.secretToken
        return true
      }
      
      throw new Error('Failed to initialize payment session')
    } catch (error) {
      console.error('Payment initialization error:', error)
      throw error
    }
  }
  
  // Show payment modal
  const showPaymentModal = () => {
    return new Promise((resolve, reject) => {
      if (!checkoutToken) {
        reject(new Error('Payment not initialized. Call initializeHelcimPay first.'))
        return
      }
      
      // Load HelcimPay.js modal script
      if (!window.appendHelcimPayIframe) {
        console.log('HelcimPay script not loaded, loading now...')
        const script = document.createElement('script')
        script.src = 'https://secure.helcim.app/helcim-pay/services/start.js'
        script.async = true
        script.onload = () => {
          console.log('HelcimPay script loaded successfully!')
          console.log('Available functions:', Object.keys(window).filter(key => key.includes('Helcim') || key.includes('helcim')))
          console.log('appendHelcimPayIframe available:', typeof window.appendHelcimPayIframe)
          openModal(resolve, reject)
        }
        script.onerror = () => {
          reject(new Error('Failed to load HelcimPay.js'))
        }
        document.head.appendChild(script)
      } else {
        console.log('HelcimPay script already loaded, calling openModal')
        openModal(resolve, reject)
      }
    })
  }
  
  // Open the payment modal
  const openModal = (resolve, reject) => {
    try {
      console.log('Trying to open modal with checkoutToken:', checkoutToken)
      
      if (typeof window.appendHelcimPayIframe === 'function') {
        // Set up event listener for HelcimPay.js responses
        const helcimPayJsIdentifierKey = 'helcim-pay-js-' + checkoutToken
        
        const handleHelcimPayEvent = (event) => {
          console.log('Received window message:', event.data)
          
          if (event.data.eventName === helcimPayJsIdentifierKey) {
            console.log('HelcimPay event received:', event.data)
            
            // Remove event listener to prevent multiple responses
            window.removeEventListener('message', handleHelcimPayEvent)
            
            if (event.data.eventStatus === 'SUCCESS') {
              console.log('Payment success:', event.data.eventMessage)
              
              // Parse the JSON string eventMessage
              let paymentData
              try {
                paymentData = JSON.parse(event.data.eventMessage)
                console.log('Parsed payment data:', paymentData)
              } catch (parseError) {
                console.error('Failed to parse eventMessage:', parseError)
                reject(new Error('Invalid payment response format'))
                return
              }
              
              // Extract transaction details from nested data structure
              const transactionData = paymentData.data?.data || {}
              console.log('Transaction data:', transactionData)
              
              resolve({
                success: true,
                transactionId: transactionData.transactionId,
                cardToken: transactionData.cardToken,
                cardLast4: transactionData.cardNumber ? transactionData.cardNumber.slice(-4) : undefined,
                cardType: transactionData.cardType || 'unknown'
              })
            } else if (event.data.eventStatus === 'ABORTED') {
              console.log('Payment aborted:', event.data.eventMessage)
              reject(new Error(event.data.eventMessage || 'Payment failed'))
            } else if (event.data.eventStatus === 'HIDE') {
              console.log('Modal closed without completion')
              reject(new Error('Payment cancelled by user'))
            }
          }
        }
        
        // Add event listener
        window.addEventListener('message', handleHelcimPayEvent)
        
        // Open the HelcimPay iframe modal
        console.log('Calling appendHelcimPayIframe with token:', checkoutToken)
        window.appendHelcimPayIframe(checkoutToken, true)
        console.log('appendHelcimPayIframe called, waiting for window messages...')
        
        // Add timeout to clean up if no response
        setTimeout(() => {
          console.log('60 seconds passed, cleaning up event listener...')
          window.removeEventListener('message', handleHelcimPayEvent)
          reject(new Error('Payment timeout - no response received'))
        }, 60000)
      } else {
        reject(new Error('appendHelcimPayIframe function not available'))
      }
    } catch (error) {
      console.error('Error opening modal:', error)
      reject(error)
    }
  }
  
  // Process payment verification
  const verifyPayment = async () => {
    try {
      return await showPaymentModal()
    } catch (error) {
      throw error
    }
  }
  
  // Cleanup tokens
  const cleanup = () => {
    checkoutToken = null
    secretToken = null
  }
  
  return {
    initializeHelcimPay,
    verifyPayment,
    cleanup
  }
}