import { Book, RelocateEvent, RebookPlugin, TOCItem } from '../core/types';
export interface TrialLimitOptions {
    maxPages?: number;
    epsilon?: number;
    sampleSections?: number;
    sampleMaxBytes?: number;
    bytesPerEstimatedTextUnit?: number;
    estimatedTextUnitsPerPage?: number;
    viewport?: {
        width?: number;
        height?: number;
        margin?: number;
    };
    typography?: {
        fontSize?: number;
        lineHeight?: number;
        fillRatio?: number;
    };
}
export interface TrialLimitState {
    maxPages: number;
    estimatedPageCount: number;
    limitFraction: number;
    pageStepFraction: number;
    estimatedBy: 'page-list' | 'pre-paginated-sections' | 'sampled-text' | 'section-size';
}
export interface TrialSnapshotLike {
    sectionIndex: number;
    sectionCount: number;
    pageIndex: number;
    pageCount: number;
    fraction: number;
}
export interface TrialTOCAccessItem {
    item: TOCItem;
    key: string;
    index: number;
    label: string;
    href: string;
    depth: number;
    parentHrefs: string[];
    hasChildren: boolean;
    sectionIndex: number;
    sectionFraction: number;
    disabled: boolean;
}
export interface TrialLimitController {
    readonly state: TrialLimitState;
    getTotalFraction(location: Pick<RelocateEvent, 'index' | 'fraction' | 'totalFraction'> | null | undefined, sectionFractions: readonly number[]): number;
    getTargetFraction(target: string | number, sectionFractions: readonly number[]): number;
    canGoTo(target: string | number, sectionFractions: readonly number[]): boolean;
    getTOCItems(sectionFractions: readonly number[], items?: readonly TOCItem[]): TrialTOCAccessItem[];
    getAllowedTOCHrefs(sectionFractions: readonly number[]): string[];
    getCurrentTOCItem(items: readonly TrialTOCAccessItem[], location: Pick<RelocateEvent, 'index' | 'tocItem'> | null | undefined): TrialTOCAccessItem | null;
    getNextTotalFraction(snapshot: TrialSnapshotLike, sectionFractions: readonly number[]): number;
    canGoNext(location: Pick<RelocateEvent, 'index' | 'fraction' | 'totalFraction'> | null | undefined, sectionFractions: readonly number[]): boolean;
}
export type TrialLimitedBook = Book & {
    trialLimit: TrialLimitController;
};
export declare function withTrialLimit(options?: TrialLimitOptions): RebookPlugin;
export declare function estimateTrialLimitState(book: Book, options?: TrialLimitOptions): Promise<TrialLimitState>;
export declare function estimateBookPageCount(book: Book, options?: TrialLimitOptions): Promise<{
    pageCount: number;
    estimatedBy: TrialLimitState['estimatedBy'];
}>;
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