import { DevicePaymentPlan } from "vr-models";
import { Transaction } from "sequelize";
export interface DeleteCheckResult {
    canDelete: boolean;
    reason?: string;
}
export declare const DPP_OperationsUtil: {
    /**
     * Check if a payment plan can be deleted
     * Rule: Can only delete if NO payments have been made
     */
    canDeletePlan(planId: string, transaction?: Transaction): Promise<DeleteCheckResult>;
    /**
     * Check if plan can be updated (before payments)
     */
    canUpdatePlan(plan: DevicePaymentPlan): {
        canUpdate: boolean;
        reason?: string;
    };
    /**
     * Validate payment amount against next pending installment
     */
    validatePaymentAmount(plan: DevicePaymentPlan, amount: number, transaction?: Transaction): Promise<{
        valid: boolean;
        reason?: string;
        nextInstallment?: any;
    }>;
    /**
     * Calculate new values after payment
     */
    calculatePaymentEffects(plan: DevicePaymentPlan, amount: number): {
        newPaidAmount: number;
        newOutstandingAmount: number;
        isNowCompleted: boolean;
        progress: number;
        statusChanged: boolean;
    };
    /**
     * Generate installments for a hire purchase plan
     * ✅ Updated to use unitPrice and create one installment at a time
     */
    generateInstallments(plan: DevicePaymentPlan, transaction?: Transaction): Promise<void>;
    /**
     * Format plan for operation response
     * ✅ Updated to use unitPrice and totalAmount
     */
    formatPlanForOps(plan: DevicePaymentPlan | null): any;
};