/**
 * Orders Domain - Salesforce Provider Mapper
 *
 * Transforms Salesforce Order and OrderItem records into domain contracts.
 */

import type {
  OrderDetails,
  OrderItemDetails,
  OrderItemSummary,
  OrderSummary,
} from "../../contract";
import { orderDetailsSchema, orderSummarySchema, orderItemDetailsSchema } from "../../schema";
import type {
  SalesforceOrderItemRecord,
  SalesforceOrderRecord,
} from "./raw.types";

/**
 * Transform a Salesforce OrderItem record into domain details + summary.
 */
export function transformSalesforceOrderItem(
  record: SalesforceOrderItemRecord
): { details: OrderItemDetails; summary: OrderItemSummary } {
  // PricebookEntry is unknown to avoid circular dependencies between domains
  const pricebookEntry = record.PricebookEntry as Record<string, any> | null | undefined;
  const product = pricebookEntry?.Product2 as Record<string, any> | undefined;
  const productBillingCycle = product?.Billing_Cycle__c ?? undefined;
  const billingCycle = record.Billing_Cycle__c ?? productBillingCycle ?? undefined;

  const details = orderItemDetailsSchema.parse({
    id: record.Id,
    orderId: record.OrderId ?? "",
    quantity: normalizeQuantity(record.Quantity),
    unitPrice: coerceNumber(record.UnitPrice),
    totalPrice: coerceNumber(record.TotalPrice),
    billingCycle,
    product: product
      ? {
          id: product.Id ?? undefined,
          name: product.Name ?? undefined,
          sku: product.StockKeepingUnit ?? undefined,
          itemClass: product.Item_Class__c ?? undefined,
          whmcsProductId: product.WH_Product_ID__c ? String(product.WH_Product_ID__c) : undefined,
          internetOfferingType: product.Internet_Offering_Type__c ?? undefined,
          internetPlanTier: product.Internet_Plan_Tier__c ?? undefined,
          vpnRegion: product.VPN_Region__c ?? undefined,
        }
      : undefined,
  });

  return {
    details,
    summary: {
      productName: details.product?.name,
      name: details.product?.name,
      sku: details.product?.sku,
      status: undefined,
      billingCycle: details.billingCycle,
      itemClass: details.product?.itemClass,
      quantity: details.quantity,
      unitPrice: details.unitPrice,
      totalPrice: details.totalPrice,
    },
  };
}

/**
 * Transform a Salesforce Order record (with associated OrderItems) into domain OrderDetails.
 */
export function transformSalesforceOrderDetails(
  order: SalesforceOrderRecord,
  itemRecords: SalesforceOrderItemRecord[]
): OrderDetails {
  const transformedItems = itemRecords.map(record =>
    transformSalesforceOrderItem(record)
  );

  const items = transformedItems.map(item => item.details);
  const itemsSummary = transformedItems.map(item => item.summary);

  const summary = buildOrderSummary(order, itemsSummary);

  return orderDetailsSchema.parse({
    ...summary,
    accountId: order.AccountId ?? undefined,
    accountName: typeof order.Account?.Name === "string" ? order.Account.Name : undefined,
    pricebook2Id: order.Pricebook2Id ?? undefined,
    activationType: order.Activation_Type__c ?? undefined,
    activationStatus: summary.activationStatus,
    activationScheduledAt: order.Activation_Scheduled_At__c ?? undefined,
    activationErrorCode: order.Activation_Error_Code__c ?? undefined,
    activationErrorMessage: order.Activation_Error_Message__c ?? undefined,
    activatedDate: typeof order.ActivatedDate === "string" ? order.ActivatedDate : undefined,
    items,
  });
}

/**
 * Transform a Salesforce Order record (with optional OrderItems) into domain OrderSummary.
 */
export function transformSalesforceOrderSummary(
  order: SalesforceOrderRecord,
  itemRecords: SalesforceOrderItemRecord[]
): OrderSummary {
  const itemsSummary = itemRecords.map(record =>
    transformSalesforceOrderItem(record).summary
  );
  return buildOrderSummary(order, itemsSummary);
}

function buildOrderSummary(
  order: SalesforceOrderRecord,
  itemsSummary: OrderItemSummary[]
): OrderSummary {
  const effectiveDate =
    ensureString(order.EffectiveDate) ??
    ensureString(order.CreatedDate) ??
    new Date().toISOString();
  const createdDate = ensureString(order.CreatedDate) ?? effectiveDate;
  const lastModifiedDate = ensureString(order.LastModifiedDate) ?? createdDate;
  const totalAmount = coerceNumber(order.TotalAmount);

  return orderSummarySchema.parse({
    id: order.Id,
    orderNumber: ensureString(order.OrderNumber) ?? order.Id,
    status: ensureString(order.Status) ?? "Unknown",
    orderType: order.Type ?? undefined,
    effectiveDate,
    totalAmount: typeof totalAmount === "number" ? totalAmount : undefined,
    createdDate,
    lastModifiedDate,
    whmcsOrderId: order.WHMCS_Order_ID__c ?? undefined,
    activationStatus: order.Activation_Status__c ?? undefined,
    itemsSummary,
  });
}

function ensureString(value: unknown): string | undefined {
  return typeof value === "string" ? value : undefined;
}

function coerceNumber(value: unknown): number | undefined {
  if (typeof value === "number") return Number.isFinite(value) ? value : undefined;
  if (typeof value === "string") {
    const parsed = Number.parseFloat(value);
    return Number.isFinite(parsed) ? parsed : undefined;
  }
  return undefined;
}

function normalizeQuantity(value: unknown): number {
  if (typeof value === "number" && Number.isFinite(value) && value > 0) {
    return Math.trunc(value);
  }
  return 1;
}