import { Model, InferAttributes, InferCreationAttributes, CreationOptional, NonAttribute, ModelStatic } from "vr-migrations";
import type { DevicePaymentPlan } from "./devicePaymentPlan.models";
import type { Payment } from "./payment.models";
export type InstallmentStatus = "PENDING" | "PAID" | "OVERDUE" | "SKIPPED";
export declare const INSTALLMENT_STATUS: readonly ["PENDING", "PAID", "OVERDUE", "SKIPPED"];
export interface InstallmentAttributes {
    id: string;
    devicePaymentPlanId: string;
    installmentNumber: number;
    amount: number;
    dueDate: Date;
    paidAt: Date | null;
    paidAmount: number | null;
    status: InstallmentStatus;
    paymentId: string | null;
    isAutoGenerated: boolean;
    metadata: Record<string, any>;
    createdAt: Date;
    updatedAt: Date;
    paymentPlan?: DevicePaymentPlan;
    payment?: Payment;
}
export interface InstallmentCreationAttributes extends Omit<InstallmentAttributes, "id" | "createdAt" | "updatedAt" | "paidAt" | "paidAmount" | "paymentId" | "metadata"> {
    id?: string;
    paidAt?: Date | null;
    paidAmount?: number | null;
    status: InstallmentStatus;
    paymentId?: string | null;
    metadata?: Record<string, any>;
    paymentPlan: DevicePaymentPlan;
    payment?: Payment;
}
export declare class Installment extends Model<InferAttributes<Installment>, InferCreationAttributes<Installment>> implements InstallmentAttributes {
    id: CreationOptional<string>;
    devicePaymentPlanId: string;
    installmentNumber: number;
    amount: number;
    dueDate: Date;
    paidAt: CreationOptional<Date | null>;
    paidAmount: CreationOptional<number | null>;
    status: InstallmentStatus;
    paymentId: CreationOptional<string | null>;
    isAutoGenerated: boolean;
    metadata: CreationOptional<Record<string, any>>;
    readonly createdAt: CreationOptional<Date>;
    readonly updatedAt: CreationOptional<Date>;
    paymentPlan: NonAttribute<DevicePaymentPlan>;
    payment?: NonAttribute<Payment>;
    static initialize(sequelize: any): void;
    static associate(models: Record<string, ModelStatic<Model>>): void;
    markAsPaid(paymentId: string, paidAmount?: number): Promise<void>;
    markAsOverdue(): Promise<void>;
    skip(): Promise<void>;
    isPaid(): boolean;
    isOverdue(): boolean;
    isPending(): boolean;
    daysUntilDue(): number;
    daysOverdue(): number;
    static getOverdueInstallments(): Promise<Installment[]>;
    static getPendingForPlan(planId: string): Promise<Installment[]>;
}
export type InstallmentModel = typeof Installment;