import request, { withSignal } from './request'

// === Types ===

export interface CategoryResponse {
  id: string
  name: string
  description: string | null
  parent_id: string | null
  icon: string | null
  sort_order: number
  item_count: number
  children: CategoryResponse[]
  created_at: string
  updated_at: string
}

export interface KnowledgeItem {
  id: string
  category_id: string
  title: string
  content: string
  keywords: string[]
  related_questions: string[]
  priority: number
  status: string
  version: number
  source: string
  tags: string[]
  created_by: string
  created_at: string
  updated_at: string
}

export interface SearchResult {
  chunk_id: string
  item_id: string
  item_title: string
  category_name: string
  content: string
  score: number
  keywords: string[]
}

export interface AnalyticsOverview {
  total_items: number
  active_items: number
  total_categories: number
  weekly_new_items: number
  total_references: number
  avg_reference_per_item: number
  hit_rate: number
  injection_rate: number
  positive_feedback_rate: number
  stale_items_count: number
}

export interface ListItemsResponse {
  items: KnowledgeItem[]
  total: number
  page: number
  page_size: number
}

// === Structured Data Sources ===

export interface StructuredSource {
  id: string
  account_id: string
  name: string
  source_type: string
  row_count: number
  columns: string[]
  created_at: string
  updated_at: string
}

export interface StructuredRow {
  id: string
  source_id: string
  row_data: Record<string, unknown>
  created_at: string
}

export interface StructuredQueryResult {
  row_id: string
  source_name: string
  row_data: Record<string, unknown>
  score: number
}

// === Service ===

export const knowledgeService = {
  // 分类
  listCategories: (signal?: AbortSignal) =>
    request.get<CategoryResponse[]>('/knowledge/categories', withSignal({}, signal))
      .then((r) => r.data),

  createCategory: (data: { name: string; description?: string; parent_id?: string; icon?: string }) =>
    request.post('/knowledge/categories', data).then((r) => r.data),

  deleteCategory: (id: string) =>
    request.delete(`/knowledge/categories/${id}`).then((r) => r.data),

  updateCategory: (id: string, data: { name?: string; description?: string; parent_id?: string; icon?: string }) =>
    request.put(`/knowledge/categories/${id}`, data).then((r) => r.data),

  reorderCategories: (items: Array<{ id: string; sort_order: number }>) =>
    request.patch('/knowledge/categories/reorder', { items }).then((r) => r.data),

  getCategoryItems: (id: string, params?: { page?: number; page_size?: number; status?: string }, signal?: AbortSignal) =>
    request.get<ListItemsResponse>(`/knowledge/categories/${id}/items`, withSignal({ params }, signal))
      .then((r) => r.data),

  // 条目
  listItems: (params: { page?: number; page_size?: number; category_id?: string; status?: string; keyword?: string }, signal?: AbortSignal) =>
    request.get<ListItemsResponse>('/knowledge/items', withSignal({ params }, signal))
      .then((r) => r.data),

  getItem: (id: string, signal?: AbortSignal) =>
    request.get<KnowledgeItem>(`/knowledge/items/${id}`, withSignal({}, signal))
      .then((r) => r.data),

  createItem: (data: {
    category_id: string
    title: string
    content: string
    keywords?: string[]
    related_questions?: string[]
    priority?: number
    tags?: string[]
  }) => request.post('/knowledge/items', data).then((r) => r.data),

  updateItem: (id: string, data: Record<string, unknown>) =>
    request.put(`/knowledge/items/${id}`, data).then((r) => r.data),

  deleteItem: (id: string) =>
    request.delete(`/knowledge/items/${id}`).then((r) => r.data),

  batchCreate: (items: Array<{
    category_id: string
    title: string
    content: string
    keywords?: string[]
    tags?: string[]
  }>) => request.post('/knowledge/items/batch', items).then((r) => r.data),

  // 搜索
  search: (data: { query: string; category_id?: string; limit?: number }) =>
    request.post<SearchResult[]>('/knowledge/search', data).then((r) => r.data),

  // 分析
  getOverview: (signal?: AbortSignal) =>
    request.get<AnalyticsOverview>('/knowledge/analytics/overview', withSignal({}, signal))
      .then((r) => r.data),

  getTrends: (signal?: AbortSignal) =>
    request.get('/knowledge/analytics/trends', withSignal({}, signal))
      .then((r) => r.data),

  getTopItems: (signal?: AbortSignal) =>
    request.get('/knowledge/analytics/top-items', withSignal({}, signal))
      .then((r) => r.data),

  getQuality: (signal?: AbortSignal) =>
    request.get('/knowledge/analytics/quality', withSignal({}, signal))
      .then((r) => r.data),

  getGaps: (signal?: AbortSignal) =>
    request.get('/knowledge/analytics/gaps', withSignal({}, signal))
      .then((r) => r.data),

  // 版本
  getVersions: (itemId: string, signal?: AbortSignal) =>
    request.get(`/knowledge/items/${itemId}/versions`, withSignal({}, signal))
      .then((r) => r.data),

  rollbackVersion: (itemId: string, version: number) =>
    request.post(`/knowledge/items/${itemId}/rollback/${version}`).then((r) => r.data),

  // 推荐搜索
  recommend: (data: { query: string; category_id?: string; limit?: number }) =>
    request.post<SearchResult[]>('/knowledge/recommend', data).then((r) => r.data),

  // 导入
  importItems: (data: { category_id: string; files: Array<{ content: string; title?: string; keywords?: string[]; tags?: string[] }> }) =>
    request.post('/knowledge/items/import', data).then((r) => r.data),

  // === Structured Data Sources ===
  listStructuredSources: (signal?: AbortSignal) =>
    request.get<StructuredSource[]>('/structured/sources', withSignal({}, signal))
      .then((r) => r.data),

  getStructuredSource: (id: string, signal?: AbortSignal) =>
    request.get<StructuredSource>(`/structured/sources/${id}`, withSignal({}, signal))
      .then((r) => r.data),

  deleteStructuredSource: (id: string) =>
    request.delete(`/structured/sources/${id}`).then((r) => r.data),

  listStructuredRows: (sourceId: string, signal?: AbortSignal) =>
    request.get<StructuredRow[]>(`/structured/sources/${sourceId}/rows`, withSignal({}, signal))
      .then((r) => r.data),

  queryStructured: (data: { source_id?: string; query?: string; limit?: number }) =>
    request.post<StructuredQueryResult[]>('/structured/query', data).then((r) => r.data),
}