/**
 * Orders Domain - WHMCS Provider Mapper
 * 
 * Transforms normalized order data to WHMCS API format.
 */

import type { OrderDetails, OrderItemDetails } from "../../contract";
import {
  type WhmcsOrderItem,
  type WhmcsAddOrderParams,
  type WhmcsAddOrderPayload,
} from "./raw.types";

export interface OrderItemMappingResult {
  whmcsItems: WhmcsOrderItem[];
  summary: {
    totalItems: number;
    serviceItems: number;
    activationItems: number;
  };
}

function normalizeBillingCycle(cycle: string | undefined): WhmcsOrderItem["billingCycle"] {
  if (!cycle) return "monthly"; // Default
  
  const normalized = cycle.trim().toLowerCase();
  if (normalized.includes("monthly")) return "monthly";
  if (normalized.includes("one")) return "onetime";
  if (normalized.includes("annual")) return "annually";
  if (normalized.includes("quarter")) return "quarterly";
  // Default to monthly if unrecognized
  return "monthly";
}

/**
 * Map a single order item to WHMCS format
 */
export function mapOrderItemToWhmcs(
  item: OrderItemDetails,
  index = 0
): WhmcsOrderItem {
  if (!item.product?.whmcsProductId) {
    throw new Error(`Order item ${index} missing WHMCS product ID`);
  }

  const whmcsItem: WhmcsOrderItem = {
    productId: item.product.whmcsProductId,
    billingCycle: normalizeBillingCycle(item.billingCycle),
    quantity: item.quantity,
  };

  return whmcsItem;
}

/**
 * Map order details to WHMCS items format
 * Extracts items from OrderDetails and transforms to WHMCS API format
 */
export function mapOrderToWhmcsItems(
  orderDetails: OrderDetails
): OrderItemMappingResult {
  if (!orderDetails.items || orderDetails.items.length === 0) {
    throw new Error("No order items provided for WHMCS mapping");
  }

  const whmcsItems: WhmcsOrderItem[] = [];
  let serviceItems = 0;
  let activationItems = 0;

  orderDetails.items.forEach((item, index) => {
    const mapped = mapOrderItemToWhmcs(item, index);
    whmcsItems.push(mapped);
    
    if (mapped.billingCycle === "monthly") {
      serviceItems++;
    } else if (mapped.billingCycle === "onetime") {
      activationItems++;
    }
  });

  return {
    whmcsItems,
    summary: {
      totalItems: whmcsItems.length,
      serviceItems,
      activationItems,
    },
  };
}

/**
 * Build WHMCS AddOrder API payload from parameters
 * Converts structured params into WHMCS API array format
 */
export function buildWhmcsAddOrderPayload(params: WhmcsAddOrderParams): WhmcsAddOrderPayload {
  const pids: string[] = [];
  const billingCycles: string[] = [];
  const quantities: number[] = [];
  const configOptions: string[] = [];
  const customFields: string[] = [];

  params.items.forEach(item => {
    pids.push(item.productId);
    billingCycles.push(item.billingCycle);
    quantities.push(item.quantity);

    // Handle config options - WHMCS expects base64 encoded serialized arrays
    if (item.configOptions && Object.keys(item.configOptions).length > 0) {
      const serialized = serializeForWhmcs(item.configOptions);
      configOptions.push(serialized);
    } else {
      configOptions.push(""); // Empty string for items without config options
    }

    // Handle custom fields - WHMCS expects base64 encoded serialized arrays
    if (item.customFields && Object.keys(item.customFields).length > 0) {
      const serialized = serializeForWhmcs(item.customFields);
      customFields.push(serialized);
    } else {
      customFields.push(""); // Empty string for items without custom fields
    }
  });

  const payload: WhmcsAddOrderPayload = {
    clientid: params.clientId,
    paymentmethod: params.paymentMethod,
    pid: pids,
    billingcycle: billingCycles,
    qty: quantities,
  };

  // Add optional fields
  if (params.promoCode) {
    payload.promocode = params.promoCode;
  }
  if (params.noinvoice !== undefined) {
    payload.noinvoice = params.noinvoice;
  }
  if (params.noinvoiceemail !== undefined) {
    payload.noinvoiceemail = params.noinvoiceemail;
  }
  if (params.noemail !== undefined) {
    payload.noemail = params.noemail;
  }
  if (configOptions.some(opt => opt !== "")) {
    payload.configoptions = configOptions;
  }
  if (customFields.some(field => field !== "")) {
    payload.customfields = customFields;
  }

  return payload;
}

/**
 * Serialize object for WHMCS API
 * WHMCS expects base64-encoded serialized data
 */
function serializeForWhmcs(data: Record<string, string>): string {
  const jsonStr = JSON.stringify(data);
  return Buffer.from(jsonStr).toString("base64");
}

/**
 * Create order notes with Salesforce tracking information
 */
export function createOrderNotes(sfOrderId: string, additionalNotes?: string): string {
  const notes: string[] = [];

  // Always include Salesforce Order ID for tracking
  notes.push(`sfOrderId=${sfOrderId}`);

  // Add provisioning timestamp
  notes.push(`provisionedAt=${new Date().toISOString()}`);

  // Add additional notes if provided
  if (additionalNotes) {
    notes.push(additionalNotes);
  }

  return notes.join("; ");
}