/**
 * Deduplication / merge hooks for contacts (Task 5.23).
 */

import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { apiPost, apiGet } from './client';

export interface DuplicateContactBrief {
  id: string;
  type: string;
  displayname: string;
  name: string | null;
  firstname: string | null;
  surname: string | null;
  email_1: string | null;
  email_2: string | null;
  phone_1: string | null;
  phone_2: string | null;
  mailing_city: string | null;
  mailing_postalcode: string | null;
  created_at: string | null;
}

export interface DuplicatePair {
  source_contact: DuplicateContactBrief;
  target_contact: DuplicateContactBrief;
  similarity_score: number;
  match_reasons: string[];
}

export interface MergeHistoryItem {
  id: string;
  source_contact_id: string;
  target_contact_id: string;
  merged_fields: Record<string, unknown>;
  merged_by: string | null;
  note: string | null;
  created_at: string | null;
}

export interface MergeHistoryResponse {
  items: MergeHistoryItem[];
  total: number;
  page: number;
  page_size: number;
}

export interface MergeRequest {
  source_contact_id: string;
  target_contact_id: string;
  field_overrides?: Record<string, unknown>;
  note?: string;
}

export function useFindDuplicates() {
  const queryClient = useQueryClient();
  return useMutation({
    mutationFn: (params: { threshold?: number; limit?: number }) =>
      apiPost<DuplicatePair[]>('/contacts/duplicates', {
        threshold: params.threshold ?? 0.7,
        limit: params.limit ?? 50,
      }),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['duplicates'] });
    },
  });
}

export function useMergeContacts() {
  const queryClient = useQueryClient();
  return useMutation({
    mutationFn: (data: MergeRequest) =>
      apiPost('/contacts/merge', data),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['contacts'] });
      queryClient.invalidateQueries({ queryKey: ['duplicates'] });
      queryClient.invalidateQueries({ queryKey: ['mergeHistory'] });
    },
  });
}

export function useMergeHistory(page = 1, pageSize = 20) {
  return useQuery({
    queryKey: ['mergeHistory', page, pageSize],
    queryFn: () =>
      apiGet<MergeHistoryResponse>(`/contacts/merge-history?page=${page}&page_size=${pageSize}`),
  });
}