import { apiClient } from './client';

// ─── Types ──────────────────────────────────────────────────────────────────

export interface ImportResult {
  total?: number;
  created?: number;
  updated?: number;
  errors?: string[];
  warnings?: string[];
  rows?: Record<string, unknown>[];
  preview?: boolean;
}

export type EntityType = 'companies' | 'contacts';
export type ExportFormat = 'csv' | 'xlsx';

// ─── Import ─────────────────────────────────────────────────────────────────

/**
 * Import a CSV file. When dryRun is true, a preview is returned without
 * writing to the database.
 */
export async function importCsv(
  file: File,
  entityType: string,
  dryRun: boolean
): Promise<ImportResult> {
  const url = dryRun ? '/import/preview' : '/import';
  const formData = new FormData();
  formData.append('file', file);
  formData.append('entity_type', entityType);

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

// ─── Export ─────────────────────────────────────────────────────────────────

/**
 * Export data as CSV or XLSX and trigger a browser download.
 */
export async function exportData(
  entityType: string,
  format: string
): Promise<void> {
  const url = `/export?entity_type=${encodeURIComponent(entityType)}&format=${encodeURIComponent(format)}`;
  const response = await apiClient.get(url, { responseType: 'blob' });

  const blob = new Blob([response.data], {
    type: format === 'xlsx'
      ? 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
      : 'text/csv',
  });

  const blobUrl = URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.href = blobUrl;
  link.download = `${entityType}_export.${format}`;
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  URL.revokeObjectURL(blobUrl);
}