/**
 * Utility functions for document approval management
 */

/**
 * Check if current user can approve a specific document type
 * @param {Object} businessSettings - Business settings object
 * @param {number} currentUserId - Current user ID
 * @param {boolean} isBusinessOwner - Whether current user is business owner
 * @param {string} documentType - Type of document (invoice, warehouse, financial)
 * @returns {boolean} - Whether user can approve
 */
export function canApproveDocument(businessSettings, currentUserEmail, isBusinessOwner, documentType) {
  // If two-step approval is not enabled, anyone can approve
  if (!businessSettings.requireTwoStepApproval) {
    return true;
  }

  // Business owner can always approve
  if (isBusinessOwner) {
    return true;
  }

  // Check specific approver based on document type
  switch (documentType) {
    case 'invoice':
      return businessSettings.invoiceApprover === currentUserEmail;
    case 'warehouse':
      return businessSettings.warehouseApprover === currentUserEmail;
    case 'financial':
      return businessSettings.financialApprover === currentUserEmail;
    default:
      return false;
  }
}

/**
 * Get document type from document object
 * @param {Object} document - Document object
 * @returns {string} - Document type
 */
export function getDocumentType(document) {
  if (document.type) {
    return document.type;
  }
  
  // Fallback based on document properties
  if (document.invoiceNumber) {
    return 'invoice';
  }
  if (document.warehouseNumber) {
    return 'warehouse';
  }
  if (document.paymentType || document.receiptType) {
    return 'financial';
  }
  
  return 'unknown';
}

/**
 * Check if document needs approval
 * @param {Object} businessSettings - Business settings object
 * @param {Object} document - Document object
 * @returns {boolean} - Whether document needs approval
 */
export function needsApproval(businessSettings, document) {
  if (!businessSettings.requireTwoStepApproval) {
    return false;
  }
  
  // Check if document is pending approval
  return document.status === 'pending_approval' || 
         document.approvalStatus === 'pending' ||
         document.approved === false;
}

/**
 * Get approval button visibility
 * @param {Object} businessSettings - Business settings object
 * @param {Object} document - Document object
 * @param {number} currentUserId - Current user ID
 * @param {boolean} isBusinessOwner - Whether current user is business owner
 * @returns {boolean} - Whether approval button should be visible
 */
export function shouldShowApprovalButton(businessSettings, document, currentUserEmail, isBusinessOwner) {
  // Check if document needs approval
  if (!needsApproval(businessSettings, document)) {
    return false;
  }
  
  // Check if user can approve
  const documentType = getDocumentType(document);
  return canApproveDocument(businessSettings, currentUserEmail, isBusinessOwner, documentType);
}

/**
 * Get approval button text
 * @param {Object} document - Document object
 * @returns {string} - Button text
 */
export function getApprovalButtonText(document) {
  if (document.status === 'pending_approval' || document.approvalStatus === 'pending') {
    return 'تایید سند';
  }
  if (document.approved === false) {
    return 'تایید مجدد';
  }
  return 'تایید';
}

/**
 * Get approval status text
 * @param {Object} document - Document object
 * @returns {string} - Status text
 */
export function getApprovalStatusText(document) {
  if (document.status === 'pending_approval' || document.approvalStatus === 'pending') {
    return 'در انتظار تایید';
  }
  if (document.approved === true) {
    return 'تایید شده';
  }
  if (document.approved === false) {
    return 'رد شده';
  }
  return 'نامشخص';
}

/**
 * Get approval status color
 * @param {Object} document - Document object
 * @returns {string} - Status color
 */
export function getApprovalStatusColor(document) {
  if (document.status === 'pending_approval' || document.approvalStatus === 'pending') {
    return 'warning';
  }
  if (document.approved === true) {
    return 'success';
  }
  if (document.approved === false) {
    return 'error';
  }
  return 'grey';
}