/**
 * Composable for managing customer selection in quote flows
 * Handles insured and buyer selection with validation
 */
export function useCustomerSelection() {
  const selectedCustomer = ref<any>(null)  // Auto-generated type from useCustomer
  const useSameForBuyer = ref(true)
  const selectedBuyer = ref<any>(null)

  /**
   * Convert customer-service customer to policy-service insured/buyer
   * Maps customer fields to policy-service structure
   */
  const toPolicyPerson = (customer: any) => {
    if (customer.customer_type === 'corporate') {
      return {
        type: 'corporate',
        company_name: customer.legal_name,
        ruc: customer.ruc,
        legal_rep_name: customer.legal_rep_name,
        legal_rep_document: customer.legal_rep_document_id,
        email: customer.email,
        phone: customer.phone,
        address: customer.address
      }
    }
    
    return {
      type: 'individual',
      name: `${customer.first_name} ${customer.last_name}`.trim(),
      date_of_birth: customer.birth_date,
      document_id: customer.document_id,
      email: customer.email,
      phone: customer.phone,
      address: customer.address
    }
  }

  /**
   * Get insured person from selected customer
   */
  const insured = computed(() => {
    if (!selectedCustomer.value) return null
    return toPolicyPerson(selectedCustomer.value)
  })

  /**
   * Get buyer person (either same as insured or different)
   */
  const buyer = computed(() => {
    if (useSameForBuyer.value) {
      return insured.value
    }
    if (!selectedBuyer.value) return null
    return toPolicyPerson(selectedBuyer.value)
  })

  /**
   * Validate customer has required fields for policy submission
   */
  const validateCustomer = (customer: any) => {
    const missing: string[] = []
    
    if (customer.customer_type === 'corporate') {
      if (!customer.legal_name) missing.push('legal_name')
      if (!customer.ruc) missing.push('ruc')
      if (!customer.legal_rep_name) missing.push('legal_rep_name')
      if (!customer.legal_rep_document_id) missing.push('legal_rep_document_id')
    } else {
      if (!customer.first_name) missing.push('first_name')
      if (!customer.last_name) missing.push('last_name')
      if (!customer.birth_date) missing.push('birth_date')
      if (!customer.document_id) missing.push('document_id')
    }
    
    return { valid: missing.length === 0, missing }
  }

  /**
   * Check if insured is valid
   */
  const isInsuredValid = computed(() => {
    if (!selectedCustomer.value) return false
    return validateCustomer(selectedCustomer.value).valid
  })

  /**
   * Check if buyer is valid
   */
  const isBuyerValid = computed(() => {
    if (useSameForBuyer.value) {
      return isInsuredValid.value
    }
    if (!selectedBuyer.value) return false
    return validateCustomer(selectedBuyer.value).valid
  })

  /**
   * Get validation errors
   */
  const validationErrors = computed(() => {
    const errors: { insured: string[]; buyer: string[] } = { insured: [], buyer: [] }
    
    if (selectedCustomer.value) {
      const validation = validateCustomer(selectedCustomer.value)
      errors.insured = validation.missing
    }
    
    if (!useSameForBuyer.value && selectedBuyer.value) {
      const validation = validateCustomer(selectedBuyer.value)
      errors.buyer = validation.missing
    }
    
    return errors
  })

  /**
   * Reset selection
   */
  function reset() {
    selectedCustomer.value = null
    selectedBuyer.value = null
    useSameForBuyer.value = true
  }

  return {
    selectedCustomer,
    selectedBuyer,
    useSameForBuyer,
    insured,
    buyer,
    isInsuredValid,
    isBuyerValid,
    validationErrors,
    reset
  }
}