/**
 * API модуль для материалов
 */

import apiClient from '@/lib/api-client';

export interface Material {
  id: number;
  title: string;
  description?: string;
  file?: string;
  file_url?: string; // полный URL для превью (изображения, видео)
  file_type?: string;
  file_name?: string;
  file_size?: number;
  material_type?: 'image' | 'video' | 'audio' | 'document' | 'presentation' | 'archive' | 'other';
  category?: number;
  category_name?: string;
  mentor?: number;
  owner?: { id: number; first_name?: string; last_name?: string; email?: string };
  is_public?: boolean;
  created_at?: string;
  updated_at?: string;
  shared_with?: { id: number; first_name?: string; last_name?: string; email?: string }[];
}

export interface MaterialCategory {
  id: number;
  name: string;
  description?: string;
}

export interface PaginatedResponse<T> {
  count: number;
  next: string | null;
  previous: string | null;
  results: T[];
}

/**
 * Получить список материалов
 */
export async function getMaterials(params?: {
  page?: number;
  page_size?: number;
  category?: number;
  search?: string;
  mentor?: number;
}): Promise<PaginatedResponse<Material>> {
  const response = await apiClient.get<PaginatedResponse<Material>>('/materials/materials/', {
    params,
  });
  return response.data;
}

/**
 * Получить материал по ID
 */
export async function getMaterialById(id: number): Promise<Material> {
  const response = await apiClient.get<Material>(`/materials/materials/${id}/`);
  return response.data;
}

/**
 * Создать материал
 */
export async function createMaterial(
  data: {
    title: string;
    description?: string;
    file?: File;
    category?: number;
    is_public?: boolean;
  }
): Promise<Material> {
  const formData = new FormData();
  formData.append('title', data.title);
  if (data.description) {
    formData.append('description', data.description);
  }
  if (data.file) {
    formData.append('file', data.file);
  }
  if (data.category) {
    formData.append('category', data.category.toString());
  }
  if (data.is_public !== undefined) {
    formData.append('is_public', data.is_public.toString());
  }

  const response = await apiClient.post<Material>('/materials/materials/', formData, {
    headers: {
      'Content-Type': 'multipart/form-data',
    },
  });
  return response.data;
}

/**
 * Обновить материал
 */
export async function updateMaterial(
  id: number,
  data: Partial<{
    title: string;
    description: string;
    file: File;
    category: number;
    is_public: boolean;
  }>
): Promise<Material> {
  const formData = new FormData();
  if (data.title) formData.append('title', data.title);
  if (data.description !== undefined) formData.append('description', data.description);
  if (data.file) formData.append('file', data.file);
  if (data.category) formData.append('category', data.category.toString());
  if (data.is_public !== undefined) {
    formData.append('is_public', data.is_public.toString());
  }

  const response = await apiClient.patch<Material>(`/materials/materials/${id}/`, formData, {
    headers: {
      'Content-Type': 'multipart/form-data',
    },
  });
  return response.data;
}

/**
 * Удалить материал
 */
export async function deleteMaterial(id: number): Promise<void> {
  await apiClient.delete(`/materials/materials/${id}/`);
}

/**
 * Предоставить доступ к материалу
 */
export async function shareMaterial(id: number, userIds: string[]): Promise<void> {
  await apiClient.post(`/materials/materials/${id}/share/`, {
    user_ids: userIds,
  });
}

/**
 * Получить категории материалов
 */
export async function getMaterialCategories(): Promise<MaterialCategory[]> {
  const response = await apiClient.get<MaterialCategory[]>('/materials/categories/');
  return response.data;
}

/**
 * Мои материалы (для экрана завершения занятия — привязка к ДЗ).
 */
export async function getMyMaterials(): Promise<Material[]> {
  const response = await apiClient.get<Material[] | PaginatedResponse<Material>>(
    '/materials/materials/my_materials/'
  );
  const data = response.data;
  if (Array.isArray(data)) return data;
  return (data as PaginatedResponse<Material>)?.results ?? [];
}