# All files / src/services billing.ts

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     import { apiService } from './api';
    import { ApiResult } from '@/types';
    import { API_ENDPOINTS } from '@/constants/api';

    export interface BillingOverview {
      currency: string;
      online_amount_cents: number;
      offline_amount_cents: number;
      adjustments_amount_cents: number;
      total_amount_cents: number;
      credits_from_online: number;
      credits_from_offline: number;
      credits_from_adjustments: number;
      total_credits: number;
    }

    export interface BillingTransaction {
      id: number;
      reseller_id: number;
      reseller_username: string;
      source: 'stripe' | 'offline' | 'adjustment';
      method?: string | null;
      reference?: string | null;
      amount_cents: number;
      currency: string;
      credits_qty: number;
      status: 'completed' | 'pending' | 'refunded' | 'failed';
      notes?: string | null;
      created_at: string;
      created_by?: number | null;
    }

    export interface BillingTransactionsQuery {
      page?: number;
      per_page?: number;
      source?: 'stripe' | 'offline' | 'adjustment';
      status?: 'completed' | 'pending' | 'refunded' | 'failed';
      method?: 'card' | 'cash' | 'bank' | 'other';
      reseller_id?: number;
      reference?: string;
      start_date?: string;     // ISO 8601 or YYYY-MM-DD
      end_date?: string;       // ISO 8601 or YYYY-MM-DD
      min_amount_cents?: number;
      max_amount_cents?: number;
    }

    export interface PaginatedBillingTransactions {
      items: BillingTransaction[];
      page: number;
      per_page: number;
      total: number;
      has_more: boolean;
    }

    export interface CreateOfflinePaymentRequest {
      reseller_id: number;
      amount_cents: number; // positive integer
      currency?: string;    // defaults to backend currency
      credits_qty: number;  // positive integer
      method?: string;      // cash/bank/other
      reference?: string;   // invoice number, etc.
      notes?: string;
    }

    class BillingService {
      async getOverview(): Promise<ApiResult<BillingOverview>> {
        try {
          return await apiService.get<BillingOverview>(API_ENDPOINTS.ADMIN.BILLING.OVERVIEW);
        } catch {
          return {
            success: false,
            error: {
              error: 'Billing Overview Failed',
              details: 'Failed to fetch billing overview',
              timestamp: new Date().toISOString()}};
        }
      }

      async getTransactions(params?: BillingTransactionsQuery): Promise<ApiResult<PaginatedBillingTransactions>> {
        try {
          const qs = new URLSearchParams();
          if (params) {
            if (params.page != null) qs.set('page', String(params.page));
            if (params.per_page != null) qs.set('per_page', String(params.per_page));
            if (params.source) qs.set('source', params.source);
            if (params.status) qs.set('status', params.status);
            if (params.method) qs.set('method', params.method);
            if (params.reseller_id != null) qs.set('reseller_id', String(params.reseller_id));
            if (params.reference) qs.set('reference', params.reference);
            if (params.start_date) qs.set('start_date', params.start_date);
            if (params.end_date) qs.set('end_date', params.end_date);
            if (params.min_amount_cents != null) qs.set('min_amount_cents', String(params.min_amount_cents));
            if (params.max_amount_cents != null) qs.set('max_amount_cents', String(params.max_amount_cents));
          }
          const url =
            qs.toString().length > 0
              ? `${API_ENDPOINTS.ADMIN.BILLING.TRANSACTIONS}?${qs.toString()}`
              : API_ENDPOINTS.ADMIN.BILLING.TRANSACTIONS;

          const raw = await apiService.get<any>(url);
          if (raw.success) {
            const data = raw.data;
            // Backend may return plain array; normalize to paginated shape
            if (Array.isArray(data)) {
              const items = data as BillingTransaction[];
              return {
                success: true,
                data: {
                  items,
                  page: 1,
                  per_page: items.length,
                  total: items.length,
                  has_more: false}};
            }
            return raw as ApiResult<PaginatedBillingTransactions>;
          }
          return raw;
        } catch {
          return {
            success: false,
            error: {
              error: 'Billing Transactions Failed',
              details: 'Failed to fetch billing transactions',
              timestamp: new Date().toISOString()}};
        }
      }

      async createOfflinePayment(payload: CreateOfflinePaymentRequest): Promise<ApiResult<BillingTransaction>> {
        try {
          return await apiService.post<BillingTransaction>(API_ENDPOINTS.ADMIN.BILLING.OFFLINE_PAYMENT, payload);
        } catch {
          return {
            success: false,
            error: {
              error: 'Offline Payment Failed',
              details: 'Failed to create offline payment',
              timestamp: new Date().toISOString()}};
        }
      }
    }

    export const billingService = new BillingService();