import { apiClient } from './client';
// TODO: P2-F3 — Replace hardcoded ENTITY_URL_MAP with dynamic backend config

export interface SearchResult {
  type: string;
  id: string;
  name: string;
  description?: string;
  url: string;
  score?: number;
  data?: Record<string, unknown>;
}

export interface SearchFacet {
  value: string;
  count: number;
}

export interface SearchFilters {
  entityTypes?: string[];
  tags?: string[];
  dateFrom?: string;
  dateTo?: string;
  sort?: 'relevance' | 'date' | 'name';
}

export interface SearchResponse {
  results: SearchResult[];
  facets?: Record<string, SearchFacet[]>;
  summary?: string;
  suggestions?: string[];
}

export interface FacetsResponse {
  entity_types: string[];
  tags: string[];
  date_ranges: Record<string, { min: string | null; max: string | null }>;
}

// Map backend entity_type to frontend route URL
const ENTITY_URL_MAP: Record<string, (id: string, data?: Record<string, unknown>) => string> = {
  contact: (id) => `/contacts/${id}`,
  company: (id) => `/contacts/${id}`,
  mail: (id) => `/mail?message_id=${id}`,
  file: (id) => `/dms?file_id=${id}`,
  event: (id) => `/calendar?event_id=${id}`,
  message: (_id, data) => data?.conversation_id ? `/communication?conversation_id=${data.conversation_id}` : '/communication',
};

function mapBackendResult(r: Record<string, unknown>): SearchResult {
  const entityType = (r.entity_type as string) || 'unknown';
  const entityId = (r.entity_id as string) || (r.id as string) || '';
  const title = (r.title as string) || (r.name as string) || '';
  const snippet = (r.snippet as string) || (r.description as string) || '';
  const data = (r.data as Record<string, unknown>) || {};
  const urlFn = ENTITY_URL_MAP[entityType];
  const url = urlFn ? urlFn(entityId, data) : '#';
  return {
    type: entityType,
    id: entityId,
    name: title,
    description: snippet,
    url,
    score: (r.score as number) || 0,
    data,
  };
}

export async function search(query: string, filters: SearchFilters = {}, limit = 20): Promise<SearchResponse> {
  const r = await apiClient.post('/search', {
    query,
    entity_types: filters.entityTypes,
    tags: filters.tags,
    date_from: filters.dateFrom,
    date_to: filters.dateTo,
    sort: filters.sort || 'relevance',
    limit,
  });
  const data = r.data;
  // Backend returns { results: [{entity_type, entity_id, title, snippet, score, data}], ... }
  const rawResults = data.results || [];
  return {
    results: rawResults.map(mapBackendResult),
    facets: data.facets,
    summary: data.summary,
    suggestions: data.suggestions,
  };
}

export async function fetchFacets(): Promise<FacetsResponse> {
  const r = await apiClient.get('/search/facets');
  return r.data as FacetsResponse;
}

export async function searchSuggest(q: string): Promise<string[]> {
  const r = await apiClient.get('/search/suggest', { params: { q } });
  return r.data.suggestions || [];
}

export async function searchSimilar(entityType: string, entityId: string): Promise<SearchResult[]> {
  const r = await apiClient.post('/search/similar', {
    entity_type: entityType,
    entity_id: entityId,
  });
  const similar = r.data.similar || {};
  const all: SearchResult[] = [];
  for (const items of Object.values(similar) as Record<string, unknown>[][]) {
    for (const item of items) {
      all.push(mapBackendResult(item));
    }
  }
  return all;
}