/**
 * Orders Domain - Validation
 * 
 * Extended business validation rules for orders.
 * These rules represent domain logic and should be reusable across frontend/backend.
 */

import { z } from "zod";
import { orderBusinessValidationSchema } from "./schema.js";

// ============================================================================
// SKU Business Rules Helpers
// ============================================================================

/**
 * Check if SKUs array contains a SIM service plan
 * (excludes activation fees and addons)
 */
export function hasSimServicePlan(skus: string[]): boolean {
  return skus.some(
    (sku) =>
      sku.toUpperCase().includes("SIM") &&
      !sku.toUpperCase().includes("ACTIVATION") &&
      !sku.toUpperCase().includes("ADDON")
  );
}

/**
 * Check if SKUs array contains a SIM activation fee
 */
export function hasSimActivationFee(_skus: string[]): boolean {
  // Deprecated: rely on catalog metadata instead of heuristics.
  return true;
}

/**
 * Check if SKUs array contains a VPN activation fee
 */
export function hasVpnActivationFee(skus: string[]): boolean {
  return skus.some(
    (sku) =>
      sku.toUpperCase().includes("VPN") &&
      sku.toUpperCase().includes("ACTIVATION")
  );
}

/**
 * Check if SKUs array contains an Internet service plan
 * (excludes installation and addons)
 */
export function hasInternetServicePlan(skus: string[]): boolean {
  return skus.some(
    (sku) =>
      sku.toUpperCase().includes("INTERNET") &&
      !sku.toUpperCase().includes("INSTALL") &&
      !sku.toUpperCase().includes("ADDON")
  );
}

/**
 * Check if SKUs array contains main service SKUs for Internet orders
 * (filters out installation, addons, activation fees)
 */
export function getMainServiceSkus(skus: string[]): string[] {
  return skus.filter((sku) => {
    const upperSku = sku.toUpperCase();
    return (
      !upperSku.includes("INSTALL") &&
      !upperSku.includes("ADDON") &&
      !upperSku.includes("ACTIVATION") &&
      !upperSku.includes("FEE")
    );
  });
}

// ============================================================================
// Extended Order Validation with SKU Business Rules
// ============================================================================

/**
 * Complete order validation including all SKU business rules
 * 
 * This schema delegates to the helper functions above for DRY validation.
 * Helper functions are reusable in both schema refinements and imperative validation.
 * 
 * Validates:
 * - Basic order structure (from orderBusinessValidationSchema)
 * - SIM orders have service plan + activation fee
 * - VPN orders have activation fee
 * - Internet orders have service plan
 */
export const orderWithSkuValidationSchema = orderBusinessValidationSchema
  .refine(
    (data) => data.orderType !== "SIM" || hasSimServicePlan(data.skus),
    {
      message: "SIM orders must include a SIM service plan",
      path: ["skus"],
    }
  )
  .refine(
    (data) => data.orderType !== "VPN" || hasVpnActivationFee(data.skus),
    {
      message: "VPN orders require an activation fee",
      path: ["skus"],
    }
  )
  .refine(
    (data) => data.orderType !== "Internet" || hasInternetServicePlan(data.skus),
    {
      message: "Internet orders require a service plan",
      path: ["skus"],
    }
  );

export type OrderWithSkuValidation = z.infer<typeof orderWithSkuValidationSchema>;

// ============================================================================
// Validation Error Messages
// ============================================================================

/**
 * Get specific validation error message for order type
 */
export function getOrderTypeValidationError(orderType: string, skus: string[]): string | null {
  switch (orderType) {
    case "SIM":
      if (!hasSimServicePlan(skus)) {
        return "A SIM plan must be selected";
      }
      break;
    case "VPN":
      if (!hasVpnActivationFee(skus)) {
        return "VPN orders require an activation fee";
      }
      break;

    case "Internet":
      if (!hasInternetServicePlan(skus)) {
        return "Internet orders require a service plan";
      }
      break;
  }

  return null;
}