import { apiFetch } from '../utils/api.js'
import type { Exam } from '../types'

export interface ExamListItem {
  id: number
  title: string
  subtitle: string | null
  created_at: number
  updated_at: number
  question_count: number
  share_token: string | null
  is_favorite: number
  tags: string
  collection_id: number | null
}

export function listExams(): Promise<ExamListItem[]> {
  return apiFetch('/api/exams')
}

export function getExam(id: number): Promise<Exam & { tags?: string[] }> {
  return apiFetch(`/api/exams/${id}`)
}

export function createExam(exam: Exam, tags?: string[]): Promise<{ id: number; title: string }> {
  return apiFetch('/api/exams', { method: 'POST', body: JSON.stringify({ exam, tags }) })
}

export function updateExam(id: number, exam: Exam, tags?: string[]): Promise<{ success: boolean }> {
  return apiFetch(`/api/exams/${id}`, { method: 'PUT', body: JSON.stringify({ exam, tags }) })
}

export function deleteExam(id: number): Promise<{ success: boolean }> {
  return apiFetch(`/api/exams/${id}`, { method: 'DELETE' })
}

export function shareExam(id: number): Promise<{ shareToken: string }> {
  return apiFetch(`/api/exams/${id}/share`, { method: 'POST' })
}

export function unshareExam(id: number): Promise<{ success: boolean }> {
  return apiFetch(`/api/exams/${id}/unshare`, { method: 'POST' })
}

export function getSharedExam(token: string): Promise<{ title: string; subtitle: string | null; questionCount: number; exam: unknown; shareMode: string }> {
  return apiFetch(`/api/share/${token}`)
}

export function cloneSharedExam(token: string): Promise<{ id: number; title: string }> {
  return apiFetch(`/api/share/${token}/clone`, { method: 'POST' })
}

export function setFavorite(id: number, isFavorite: boolean): Promise<{ success: boolean }> {
  return apiFetch(`/api/exams/${id}/favorite`, { method: 'PATCH', body: JSON.stringify({ isFavorite }) })
}

export function exportExam(id: number): Promise<Blob> {
  return fetch(`/api/exams/${id}/export`, {
    headers: {
      'Authorization': `Bearer ${localStorage.getItem('brainwave.auth.token') || ''}`,
    },
  }).then((res) => {
    if (!res.ok) throw new Error('Export failed')
    return res.blob()
  })
}

export function duplicateExam(id: number): Promise<{ id: number; title: string }> {
  return apiFetch(`/api/exams/${id}/duplicate`, { method: 'POST' })
}

export interface ClonedExamItem {
  id: number
  title: string
  subtitle: string | null
  created_at: number
  updated_at: number
  question_count: number
  cloned_from_share_token: string
}

export function listClonedExams(): Promise<ClonedExamItem[]> {
  return apiFetch('/api/exams/cloned')
}

export function setShareMode(id: number, mode: 'view' | 'clone'): Promise<{ success: boolean }> {
  return apiFetch(`/api/exams/${id}/share-mode`, { method: 'PUT', body: JSON.stringify({ mode }) })
}

export function batchDelete(ids: number[]): Promise<{ deleted: number }> {
  return apiFetch('/api/exams/batch-delete', { method: 'POST', body: JSON.stringify({ ids }) })
}