import { SmrtCollection } from '@happyvertical/smrt-core';
import { ReferralAgreement } from '../models/ReferralAgreement.js';
import { ReferralAgreementApprovalMode } from '../types.js';
/**
 * Fields an amendment may change relative to the version it copies.
 * `referrerId`/`programId` are fixed (they identify the agreement),
 * `version` is computed, and `status` is always `draft`.
 */
export interface ReferralAgreementAmendmentChanges {
    commissionPlanKey?: string;
    commissionPlanVersion?: number;
    clearingDays?: number;
    approvalMode?: ReferralAgreementApprovalMode;
    effectiveFrom?: Date | null;
    effectiveTo?: Date | null;
    metadata?: Record<string, unknown>;
}
export declare class ReferralAgreementCollection extends SmrtCollection<ReferralAgreement> {
    static readonly _itemClass: typeof ReferralAgreement;
    /** Every version of one referrer+program agreement, newest version first. */
    findByReferrerAndProgram(referrerId: string, programId: string): Promise<ReferralAgreement[]>;
    /**
     * The agreement governing `(referrerId, programId)` at instant `at`
     * (default now): status `active` AND effective window containing `at`
     * (`effectiveFrom` null = always started; `effectiveTo` null =
     * open-ended). When several active versions overlap — transitional states
     * during amendment activation — the highest version wins. `null` when
     * nothing governs.
     */
    activeFor(referrerId: string, programId: string, at?: Date): Promise<ReferralAgreement | null>;
    /**
     * Create an amendment: insert a new DRAFT row with
     * `version = max(existing versions) + 1`, copying the latest existing
     * version's fields and then applying `changes`. The source version is not
     * touched — activate the draft (and supersede the prior active version)
     * as a separate, explicit step.
     *
     * Throws when no version exists for the pair (nothing to amend — use
     * `create` for a brand-new agreement).
     */
    createAmendment(referrerId: string, programId: string, changes?: ReferralAgreementAmendmentChanges): Promise<ReferralAgreement>;
}
export default ReferralAgreementCollection;
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