/**
 * Global Import/Export Configuration System
 * Provides reusable import/export configs for table pages
 * 
 * Usage:
 * ```typescript
 * import { useImportExport } from '@/config/import-export.config';
 * 
 * const { handleExport, handleImport, ImportModal } = useImportExport({
 *   exportEndpoint: '/v1/planner/keywords/export/',
 *   importEndpoint: '/v1/planner/keywords/import_keywords/',
 *   filename: 'keywords',
 *   formats: ['csv', 'json'],
 *   onImportSuccess: () => loadData(),
 * });
 * ```
 */

import React, { useState, useCallback } from 'react';
import { exportTableData, importTableData, ExportConfig, ImportConfig } from '../utils/table-import-export';
import { Modal } from '../components/ui/modal';
import Button from '../components/ui/button/Button';
import FileInput from '../components/form/input/FileInput';
import Label from '../components/form/Label';

export interface ImportExportConfigOptions {
  exportEndpoint: string;
  importEndpoint: string;
  filename: string;
  formats?: ('csv' | 'json')[];
  acceptedFormats?: string[];
  maxFileSize?: number;
  importQueryParams?: Record<string, any>; // Query params for import (e.g., site_id, sector_id)
  onImportSuccess?: (result: any) => void;
  onExportSuccess?: () => void;
  onError?: (error: Error) => void;
}

export interface ImportExportHandlers {
  handleExport: (format?: 'csv' | 'json', filters?: Record<string, any>) => Promise<void>;
  handleImportClick: () => void;
  ImportModal: React.FC;
}

/**
 * React hook for import/export functionality
 */
export function useImportExport(
  options: ImportExportConfigOptions
): ImportExportHandlers {
  const {
    exportEndpoint,
    importEndpoint,
    filename,
    formats = ['csv'],
    acceptedFormats = ['.csv'],
    maxFileSize = 5 * 1024 * 1024, // 5MB default
    onImportSuccess,
    onExportSuccess,
    onError,
  } = options;

  const [isImportModalOpen, setIsImportModalOpen] = useState(false);
  const [isProcessing, setIsProcessing] = useState(false);

  const handleExport = useCallback(async (
    format: 'csv' | 'json' = 'csv',
    filters: Record<string, any> = {}
  ) => {
    setIsProcessing(true);
    try {
      const exportConfig: ExportConfig = {
        endpoint: exportEndpoint,
        filename,
        format,
        filters,
      };

      await exportTableData(
        exportConfig,
        (progress) => console.log(progress),
        (error) => {
          onError?.(error);
          throw error;
        }
      );

      onExportSuccess?.();
    } catch (error) {
      const err = error instanceof Error ? error : new Error('Export failed');
      onError?.(err);
      throw err;
    } finally {
      setIsProcessing(false);
    }
  }, [exportEndpoint, filename, onError, onExportSuccess]);

  const handleImport = useCallback(async (file: File) => {
    setIsProcessing(true);
    try {
      const importConfig: ImportConfig = {
        endpoint: importEndpoint,
        acceptedFormats,
        maxFileSize,
        queryParams: options.importQueryParams,
        onSuccess: (result) => {
          onImportSuccess?.(result);
        },
      };

      const result = await importTableData(
        file,
        importConfig,
        (progress) => console.log(progress),
        (error) => {
          onError?.(error);
          throw error;
        }
      );

      setIsImportModalOpen(false);
      return result;
    } catch (error) {
      const err = error instanceof Error ? error : new Error('Import failed');
      onError?.(err);
      throw err;
    } finally {
      setIsProcessing(false);
    }
  }, [importEndpoint, acceptedFormats, maxFileSize, onImportSuccess, onError]);

  const handleImportFileChange = useCallback(async (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;
    await handleImport(file);
    // Reset file input
    e.target.value = '';
  }, [handleImport]);

  const ImportModalComponent: React.FC = () => (
    <Modal
      isOpen={isImportModalOpen}
      onClose={() => setIsImportModalOpen(false)}
      className="max-w-md"
    >
      <div className="p-6">
        <h2 className="text-xl font-bold mb-6 text-gray-800 dark:text-white">
          Import {filename.charAt(0).toUpperCase() + filename.slice(1)}
        </h2>

        <div className="space-y-4">
          <div>
            <Label>CSV File</Label>
            <FileInput
              onChange={handleImportFileChange}
              accept={acceptedFormats.join(',')}
              disabled={isProcessing}
            />
            <p className="text-sm text-gray-500 dark:text-gray-400 mt-2">
              Upload a CSV file (max {maxFileSize / 1024 / 1024}MB)
            </p>
            {filename === 'keywords' && (
              <p className="text-xs text-gray-600 dark:text-gray-300 mt-2 p-2 bg-brand-50 dark:bg-brand-900/20 rounded border border-brand-200 dark:border-brand-800">
                <strong>Expected columns:</strong> keyword, volume, difficulty, country, status
              </p>
            )}
          </div>

          <div className="flex justify-end gap-4 pt-4">
            <Button
              variant="outline"
              onClick={() => setIsImportModalOpen(false)}
              disabled={isProcessing}
            >
              Close
            </Button>
          </div>
        </div>
      </div>
    </Modal>
  );

  return {
    handleExport,
    handleImportClick: () => setIsImportModalOpen(true),
    ImportModal: ImportModalComponent,
  };
}

/**
 * Pre-configured import/export hooks for common modules
 */
export const useKeywordsImportExport = (
  onImportSuccess?: () => void, 
  onError?: (error: Error) => void,
  importQueryParams?: Record<string, any>
) => {
  return useImportExport({
    exportEndpoint: '/v1/planner/keywords/export/',
    importEndpoint: '/v1/planner/keywords/import_keywords/',
    filename: 'keywords',
    formats: ['csv', 'json'],
    acceptedFormats: ['.csv'],
    maxFileSize: 5 * 1024 * 1024,
    importQueryParams,
    onImportSuccess,
    onError,
  });
};

export const useClustersImportExport = (onImportSuccess?: () => void, onError?: (error: Error) => void) => {
  return useImportExport({
    exportEndpoint: '/v1/planner/clusters/export/',
    importEndpoint: '/v1/planner/clusters/import_clusters/',
    filename: 'clusters',
    formats: ['csv', 'json'],
    acceptedFormats: ['.csv'],
    maxFileSize: 5 * 1024 * 1024,
    onImportSuccess,
    onError,
  });
};