import { Epic, TaskStatus, TaskPriority, FunctionalArea } from '../types/task.js';
import { FileOperationResult } from '../utils/file-utils.js';
export interface CreateEpicParams {
    title: string;
    description: string;
    projectId: string;
    priority?: TaskPriority;
    functionalArea?: FunctionalArea;
    estimatedHours?: number;
    tags?: string[];
    dependencies?: string[];
}
export interface UpdateEpicParams {
    title?: string;
    description?: string;
    status?: TaskStatus;
    priority?: TaskPriority;
    estimatedHours?: number;
    tags?: string[];
    dependencies?: string[];
}
export interface EpicQueryParams {
    projectId?: string;
    status?: TaskStatus;
    priority?: TaskPriority;
    tags?: string[];
    createdAfter?: Date;
    createdBefore?: Date;
    limit?: number;
    offset?: number;
}
export interface EpicProgress {
    epicId: string;
    totalTasks: number;
    completedTasks: number;
    inProgressTasks: number;
    pendingTasks: number;
    blockedTasks: number;
    progressPercentage: number;
    estimatedHours: number;
    actualHours: number;
    remainingHours: number;
}
export declare class EpicService {
    private static instance;
    private constructor();
    static getInstance(): EpicService;
    static resetInstance(): void;
    createEpic(params: CreateEpicParams, createdBy?: string): Promise<FileOperationResult<Epic>>;
    getEpic(epicId: string): Promise<FileOperationResult<Epic>>;
    updateEpic(epicId: string, params: UpdateEpicParams, updatedBy?: string): Promise<FileOperationResult<Epic>>;
    deleteEpic(epicId: string, deletedBy?: string): Promise<FileOperationResult<void>>;
    listEpics(query?: EpicQueryParams): Promise<FileOperationResult<Epic[]>>;
    addTaskToEpic(epicId: string, taskId: string): Promise<FileOperationResult<Epic>>;
    removeTaskFromEpic(epicId: string, taskId: string): Promise<FileOperationResult<Epic>>;
    getEpicProgress(epicId: string): Promise<FileOperationResult<EpicProgress>>;
    private validateCreateEpicParams;
    private validateUpdateEpicParams;
    private applyEpicFilters;
}
export declare function getEpicService(): EpicService;
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