// Update customer billing address
const HELCIM_API_BASE = 'https://api.helcim.com/v2'

export default defineEventHandler(async (event) => {
  try {
    const config = useRuntimeConfig(event)
    const body = await readBody(event)
    
    // Validate required fields
    if (!body.customerId || !body.billingAddress) {
      throw createError({
        statusCode: 400,
        statusMessage: 'Customer ID and billing address are required'
      })
    }

    const { billingAddress } = body
    
    // Validate billing address fields
    if (!billingAddress.street || !billingAddress.city || !billingAddress.country || !billingAddress.postalCode) {
      throw createError({
        statusCode: 400,
        statusMessage: 'Complete billing address is required'
      })
    }

    const helcimToken = config.public.helcimToken || process.env.NUXT_PUBLIC_HELCIM_TOKEN
    
    // Update customer billing address in Helcim
    const response = await fetch(`${HELCIM_API_BASE}/customers/${body.customerId}`, {
      method: 'PATCH',
      headers: {
        'accept': 'application/json',
        'content-type': 'application/json',
        'api-token': helcimToken
      },
      body: JSON.stringify({
        billingAddress: {
          name: billingAddress.name,
          street1: billingAddress.street,
          city: billingAddress.city,
          province: billingAddress.province || billingAddress.state,
          country: billingAddress.country,
          postalCode: billingAddress.postalCode
        }
      })
    })
    
    if (!response.ok) {
      const errorText = await response.text()
      console.error('Billing address update failed:', response.status, errorText)
      throw createError({
        statusCode: response.status,
        statusMessage: `Failed to update billing address: ${errorText}`
      })
    }
    
    const customerData = await response.json()

    return {
      success: true,
      customer: customerData
    }
  } catch (error) {
    console.error('Error updating billing address:', error)
    throw createError({
      statusCode: error.statusCode || 500,
      statusMessage: error.message || 'Failed to update billing address'
    })
  }
})