export type QuestionStatus = "draft" | "reviewing" | "published" | "archived"
export type Difficulty = 1 | 2 | 3 | 4 | 5

export interface Question {
  id: string
  stem: string
  correctAnswer: string
  distractors: string[]
  categoryId: string
  difficulty: Difficulty
  status: QuestionStatus
  knowledgeCardBasic: string
  knowledgeCardDeep?: string
  sourceRef?: string
  source: "system" | "ugc"
  stats: {
    timesAnswered: number
    correctRate: number
    avgTimeMs: number
  }
  createdAt: string
  updatedAt: string
}

export interface QuestionFormData {
  stem: string
  correctAnswer: string
  distractors: string[]
  categoryId: string
  difficulty: Difficulty
  status: QuestionStatus
  knowledgeCardBasic: string
  knowledgeCardDeep?: string
  sourceRef?: string
}

// ── Import API types (match duoqi-api spec) ──

export type QuestionContentType = "text" | "image" | "video" | "audio"

export interface ImportQuestionItem {
  stem: { text: string }
  contentType: QuestionContentType
  correctAnswer: string
  distractors: string[]
  categoryId: string
  difficulty?: number
  knowledgeCard?: {
    summary: string
    deepDive?: string
    sourceRef?: string
  }
}

export interface ImportSuccessResult {
  total: number
  succeeded: number
  ids: string[]
}

export interface ImportValidationError {
  index: number
  errors: string[]
}