import { apiClient } from './client';

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

export interface ImportError {
  row: number;
  field: string;
  message: string;
}

export interface ErrorReport {
  total_errors: number;
  errors: ImportError[];
}

export interface ImportResult {
  total?: number;
  succeeded?: number;
  failed?: number;
  status?: 'success' | 'partial_success' | 'failed' | 'pending' | 'processing' | 'completed';
  dry_run?: boolean;
  error_report?: ErrorReport;
  created?: Record<string, unknown>[];
  errors?: string[];
  warnings?: string[];
  rows?: Record<string, unknown>[];
  preview?: boolean;
  // Legacy compat
  valid?: number;
  invalid?: number;
  job_id?: string;
  message?: string;
}

export interface PreviewResult {
  total_rows: number;
  columns: string[];
  preview_rows: Record<string, string>[];
  mapping_suggestion: Record<string, string>;
  target_fields: string[];
}

export interface ValidateResult {
  total: number;
  succeeded: number;
  failed: number;
  status: string;
  dry_run: boolean;
  error_report: ErrorReport;
  created: Record<string, unknown>[];
}

export interface JobStatus {
  status: 'pending' | 'processing' | 'completed' | 'partial_success' | 'failed';
  progress?: number;
  total?: number;
  succeeded?: number;
  failed?: number;
  error_report?: ErrorReport;
  created_count?: number;
  error?: string;
}

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

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

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

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

/**
 * Preview a file: parse, return first 10 rows + columns + mapping suggestion.
 */
export async function previewImport(
  file: File,
  entityType: string,
): Promise<PreviewResult> {
  const formData = new FormData();
  formData.append('file', file);
  formData.append('entity_type', entityType);

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

/**
 * Validate a file against mapping: returns error report without importing.
 */
export async function validateImport(
  file: File,
  entityType: string,
  fieldMapping?: Record<string, string>,
): Promise<ValidateResult> {
  const formData = new FormData();
  formData.append('file', file);
  formData.append('entity_type', entityType);
  if (fieldMapping) {
    formData.append('field_mapping', JSON.stringify(fieldMapping));
  }

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

/**
 * Import contacts specifically.
 */
export async function importContacts(
  file: File,
  fieldMapping?: Record<string, string>,
): Promise<ImportResult> {
  const formData = new FormData();
  formData.append('file', file);
  if (fieldMapping) {
    formData.append('field_mapping', JSON.stringify(fieldMapping));
  }

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

/**
 * Import companies specifically.
 */
export async function importCompanies(
  file: File,
  fieldMapping?: Record<string, string>,
): Promise<ImportResult> {
  const formData = new FormData();
  formData.append('file', file);
  if (fieldMapping) {
    formData.append('field_mapping', JSON.stringify(fieldMapping));
  }

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

/**
 * Get status of a background import job.
 */
export async function getImportJobStatus(jobId: string): Promise<JobStatus> {
  const response = await apiClient.get<JobStatus>(`/import/status/${jobId}`);
  return response.data;
}

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

/**
 * Export data as CSV, XLSX, or JSON 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'
      : format === 'json'
        ? 'application/json'
        : '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);
}