// Challenge Service Types

export interface ChallengeUser {
  _id: string
  id: string
  nickname: string
  createdAt: string
}

export interface ChallengeTask {
  _id: string
  id: string
  title: string
  description: string // Markdown
  hiddenInstructions?: string // Только для преподавателей
  creator?: {
    sub: string
    preferred_username: string
    email?: string
  } // Только для преподавателей
  createdAt: string
  updatedAt: string
}

export interface ChallengeChain {
  _id: string
  id: string
  name: string
  tasks: ChallengeTask[] // Populated
  isActive: boolean
  createdAt: string
  updatedAt: string
}

export type SubmissionStatus = 'pending' | 'in_progress' | 'accepted' | 'needs_revision'

export interface ChallengeSubmission {
  _id: string
  id: string
  user: ChallengeUser | string
  task: ChallengeTask | string
  result: string
  status: SubmissionStatus
  queueId?: string
  feedback?: string
  submittedAt: string
  checkedAt?: string
  attemptNumber: number
}

export type QueueStatusType = 'waiting' | 'in_progress' | 'completed' | 'error' | 'not_found'

export interface QueueStatus {
  status: QueueStatusType
  submission?: ChallengeSubmission & { task: ChallengeTask }
  error?: string
  position?: number
}

export interface TaskStats {
  taskId: string
  taskTitle: string
  attempts: Array<{
    attemptNumber: number
    status: SubmissionStatus
    submittedAt: string
    checkedAt?: string
    feedback?: string
  }>
  totalAttempts: number
  status: 'not_attempted' | 'pending' | 'in_progress' | 'completed' | 'needs_revision'
  lastAttemptAt: string | null
}

export interface ChainStats {
  chainId: string
  chainName: string
  totalTasks: number
  completedTasks: number
  progress: number // 0-100
}

export interface UserStats {
  totalTasksAttempted: number
  completedTasks: number
  inProgressTasks: number
  needsRevisionTasks: number
  totalSubmissions: number
  averageCheckTimeMs: number
  taskStats: TaskStats[]
  chainStats: ChainStats[]
}

export interface SystemStats {
  users: number
  tasks: number
  chains: number
  submissions: {
    total: number
    accepted: number
    rejected: number
    pending: number
    inProgress: number
  }
  averageCheckTimeMs: number
  queue: {
    queueLength: number
    waiting: number
    inProgress: number
    maxConcurrency: number
    currentlyProcessing: number
  }
}

// API Request/Response types
export interface APIResponse<T> {
  error: unknown
  data: T
}

export interface CreateTaskRequest {
  title: string
  description: string
  hiddenInstructions?: string
}

export interface UpdateTaskRequest {
  title?: string
  description?: string
  hiddenInstructions?: string
}

export interface CreateChainRequest {
  name: string
  taskIds: string[] // Array of task IDs
  isActive?: boolean
}

export interface UpdateChainRequest {
  name?: string
  taskIds?: string[]
  isActive?: boolean
}

export interface DuplicateChainRequest {
  name?: string
}

export interface ClearSubmissionsResponse {
  deletedCount: number
  chainId: string
  userId?: string
}

// ========== Stats v2 Types ==========

export type TaskProgressStatus = 'not_started' | 'pending' | 'in_progress' | 'needs_revision' | 'completed'

export interface TaskTableItem {
  taskId: string
  title: string
  totalAttempts: number
  uniqueUsers: number
  acceptedCount: number
  successRate: number
  averageAttemptsToSuccess: number
}

export interface ChainProgress {
  chainId: string
  chainName: string
  totalTasks: number
  completedTasks: number
  progressPercent: number
}

export interface ActiveParticipant {
  userId: string
  nickname: string
  totalSubmissions: number
  completedTasks: number
  chainProgress: ChainProgress[]
}

export interface TaskProgress {
  taskId: string
  taskTitle: string
  status: TaskProgressStatus
}

export interface ParticipantProgress {
  userId: string
  nickname: string
  taskProgress: TaskProgress[]
  completedCount: number
  progressPercent: number
}

export interface ChainTask {
  taskId: string
  title: string
  description: string
}

export interface ChainDetailed {
  chainId: string
  name: string
  totalTasks: number
  tasks: ChainTask[]
  participantProgress: ParticipantProgress[]
}

export interface SystemStatsV2 {
  // Базовая статистика из v1
  users: number
  tasks: number
  chains: number
  submissions: {
    total: number
    accepted: number
    rejected: number
    pending: number
    inProgress: number
  }
  averageCheckTimeMs: number
  queue: {
    queueLength: number
    waiting: number
    inProgress: number
    maxConcurrency: number
    currentlyProcessing: number
  }
  // Новые данные v2
  tasksTable: TaskTableItem[]
  activeParticipants: ActiveParticipant[]
  chainsDetailed: ChainDetailed[]
}

// ========== Submissions / Checking ==========

export interface SubmitRequest {
  userId: string
  taskId: string
  result: string
  // Флаг тестового режима: проверка без создания Submission и очереди
  isTest?: boolean
  // Временные скрытые инструкции для тестовой проверки (не сохраняются в задачу)
  hiddenInstructions?: string
}

export interface TestSubmissionResult {
  isTest: true
  status: Exclude<SubmissionStatus, 'pending' | 'in_progress'>
  feedback?: string
}

// ========== Chain Submissions API ==========

export interface ChainSubmissionsParticipant {
  userId: string
  nickname: string
  completedTasks: number
  totalTasks: number
  progressPercent: number
}

export interface ChainSubmissionsResponse {
  chain: {
    id: string
    name: string
    tasks: Array<{ id: string; title: string }>
  }
  participants: ChainSubmissionsParticipant[]
  submissions: ChallengeSubmission[]
  pagination: {
    total: number
    limit: number
    offset: number
  }
}