/**
 * WHMCS Subscriptions Provider - Mapper
 * 
 * Transforms raw WHMCS product/service data into normalized subscription types.
 */

import type { Subscription, SubscriptionStatus, SubscriptionCycle } from "../../contract.js";
import { subscriptionSchema } from "../../schema.js";
import {
  type WhmcsProductRaw,
  whmcsProductRawSchema,
  whmcsCustomFieldsContainerSchema,
} from "./raw.types.js";

export interface TransformSubscriptionOptions {
  defaultCurrencyCode?: string;
  defaultCurrencySymbol?: string;
}

// Status mapping
const STATUS_MAP: Record<string, SubscriptionStatus> = {
  active: "Active",
  inactive: "Inactive",
  pending: "Pending",
  cancelled: "Cancelled",
  canceled: "Cancelled",
  terminated: "Terminated",
  completed: "Completed",
  suspended: "Suspended",
  fraud: "Cancelled",
};

// Cycle mapping
const CYCLE_MAP: Record<string, SubscriptionCycle> = {
  monthly: "Monthly",
  annually: "Annually",
  annual: "Annually",
  yearly: "Annually",
  quarterly: "Quarterly",
  "semi annually": "Semi-Annually",
  semiannually: "Semi-Annually",
  "semi-annually": "Semi-Annually",
  biennially: "Biennially",
  triennially: "Triennially",
  "one time": "One-time",
  onetime: "One-time",
  "one-time": "One-time",
  "one time fee": "One-time",
  free: "Free",
};

function mapStatus(status?: string | null): SubscriptionStatus {
  if (!status) return "Cancelled";
  const mapped = STATUS_MAP[status.trim().toLowerCase()];
  return mapped ?? "Cancelled";
}

function mapCycle(cycle?: string | null): SubscriptionCycle {
  if (!cycle) return "One-time";
  const normalized = cycle.trim().toLowerCase().replace(/[_\s-]+/g, " ");
  return CYCLE_MAP[normalized] ?? "One-time";
}

function parseAmount(amount: string | number | undefined): number {
  if (typeof amount === "number") {
    return amount;
  }
  if (!amount) {
    return 0;
  }

  const cleaned = String(amount).replace(/[^\d.-]/g, "");
  const parsed = Number.parseFloat(cleaned);
  return Number.isNaN(parsed) ? 0 : parsed;
}

function formatDate(input?: string | null): string | undefined {
  if (!input) {
    return undefined;
  }

  const date = new Date(input);
  if (Number.isNaN(date.getTime())) {
    return undefined;
  }

  return date.toISOString();
}

function extractCustomFields(raw: unknown): Record<string, string> | undefined {
  if (!raw) return undefined;

  const container = whmcsCustomFieldsContainerSchema.safeParse(raw);
  if (!container.success) return undefined;

  const customfield = container.data.customfield;
  const fieldsArray = Array.isArray(customfield) ? customfield : [customfield];

  const entries = fieldsArray.reduce<Record<string, string>>((acc, field) => {
    if (field?.name && field.value) {
      acc[field.name] = field.value;
    }
    return acc;
  }, {});

  return Object.keys(entries).length > 0 ? entries : undefined;
}

/**
 * Transform raw WHMCS product/service into normalized Subscription
 */
export function transformWhmcsSubscription(
  rawProduct: unknown,
  options: TransformSubscriptionOptions = {}
): Subscription {
  // Validate raw data
  const product = whmcsProductRawSchema.parse(rawProduct);

  // Extract currency info
  const currency = product.pricing?.currency || options.defaultCurrencyCode || "JPY";
  const currencySymbol =
    product.pricing?.currencyprefix ||
    product.pricing?.currencysuffix ||
    options.defaultCurrencySymbol;

  // Determine amount
  const amount = parseAmount(
    product.amount ||
    product.recurringamount ||
    product.pricing?.amount ||
    product.firstpaymentamount ||
    0
  );

  // Transform to domain model
  const subscription: Subscription = {
    id: product.id,
    serviceId: product.serviceid || product.id,
    productName: product.name || product.translated_name || "Unknown Product",
    domain: product.domain || undefined,
    cycle: mapCycle(product.billingcycle),
    status: mapStatus(product.status),
    nextDue: formatDate(product.nextduedate || product.nextinvoicedate),
    amount,
    currency,
    currencySymbol,
    registrationDate: formatDate(product.regdate) || new Date().toISOString(),
    notes: product.notes || undefined,
    customFields: extractCustomFields(product.customfields),
    orderNumber: product.ordernumber || undefined,
    groupName: product.groupname || product.translated_groupname || undefined,
    paymentMethod: product.paymentmethodname || product.paymentmethod || undefined,
    serverName: product.servername || product.serverhostname || undefined,
  };

  // Validate against domain schema
  return subscriptionSchema.parse(subscription);
}

/**
 * Transform multiple WHMCS subscriptions
 */
export function transformWhmcsSubscriptions(
  rawProducts: unknown[],
  options: TransformSubscriptionOptions = {}
): Subscription[] {
  return rawProducts.map(raw => transformWhmcsSubscription(raw, options));
}