import React, { useState, useEffect } from 'react';
import { IoIosTrash, IoIosCheckmark, IoIosClose } from 'react-icons/io';
import { useLanguage } from '../../../../providers/language/LanguageContext';
import styles from '../ActionButton.module.css';

export interface DeleteActionButtonProps<T = any> {
  row: T;
  disabled?: boolean | { disabled: boolean; message?: string };
  loading?: boolean;
  className?: string;
  title?: string;
  confirmTitle?: string;
  cancelTitle?: string;
  containerRef?: React.RefObject<HTMLDivElement | null>;
  onSuccess?: (row: T) => void;
  onError?: (row: T, error: string) => void;
  hookData: any; // REQUIRED: Contains all hook data including operations and refetch
  // Field mappings
  idField?: string; // Field name for the unique identifier
  operationName?: string; // Name of the delete operation in hookData
  loadingStateName?: string; // Name of the loading state in hookData
}

export function DeleteActionButton<T = any>({
  row,
  disabled = false,
  loading = false,
  className = '',
  title,
  confirmTitle,
  cancelTitle,
  containerRef,
  onSuccess,
  onError,
  hookData,
  idField = 'id',
  operationName = 'handleDelete',
  loadingStateName = 'deletingItems'
}: DeleteActionButtonProps<T>) {
  const { t } = useLanguage();
  const [isConfirming, setIsConfirming] = useState(false);
  const [isDeleting, setIsDeleting] = useState(false);
  
  // Extract disabled state and tooltip message
  const isDisabled = typeof disabled === 'boolean' ? disabled : disabled?.disabled || false;
  const disabledMessage = typeof disabled === 'object' ? disabled?.message : undefined;
  
  // Validate that hookData is provided with required operations
  if (!hookData) {
    throw new Error('DeleteActionButton requires hookData to be provided');
  }
  
  // Extract operations from hookData
  const handleDelete = hookData[operationName];
  const removeOptimistically = hookData.removeOptimistically || hookData.removeFileOptimistically;
  const refetch = hookData.refetch;
  const loadingState = hookData[loadingStateName];
  
  
  // Validate required operations exist
  if (!handleDelete) {
    throw new Error(`DeleteActionButton requires hookData.${operationName} to be defined`);
  }
  if (!refetch) {
    throw new Error('DeleteActionButton requires hookData.refetch to be defined');
  }

  // Reset confirmation state when row changes (e.g., when a previous row is deleted)
  useEffect(() => {
    setIsConfirming(false);
  }, [(row as any)[idField]]);

  // Handle clicks outside delete confirmation buttons
  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (isConfirming && containerRef?.current) {
        if (!containerRef.current.contains(event.target as Node)) {
          setIsConfirming(false);
        }
      }
    };

    if (isConfirming) {
      document.addEventListener('mousedown', handleClickOutside);
      return () => {
        document.removeEventListener('mousedown', handleClickOutside);
      };
    }
  }, [isConfirming, containerRef]);

  const handleDeleteClick = (e: React.MouseEvent) => {
    e.stopPropagation();
    if (!isDisabled && !loading && !isDeleting) {
      setIsConfirming(true);
    }
  };

  const handleConfirmDelete = async (e: React.MouseEvent) => {
    e.stopPropagation();
    
    try {
      // Get ID from row using configurable field name
      const itemId = (row as any)[idField];
      if (!itemId) {
        throw new Error(`${idField} not found`);
      }
      
      // Immediately remove from UI for instant feedback and reset state
      if (removeOptimistically) {
        removeOptimistically(itemId);
      } 
      
      // Reset confirmation state immediately so it doesn't carry over to next row
      setIsConfirming(false);
      setIsDeleting(true);
      
      // Call the delete API in the background
      const success = await handleDelete(itemId);
      
      if (success) {
        // Always refetch after a successful delete. The server has actually
        // removed the row, so fresh data won't bring it back — and this is
        // what re-syncs pagination.totalItems (and clears any optimistic
        // hidden-row state maintained by FormGeneratorTable).
        refetch();
        onSuccess?.(row);
      } else {
        // Refetch to restore the item in case of failure
        await refetch();
        onError?.(row, t('Löschen fehlgeschlagen'));
      }
    } catch (error: any) {
      console.error('Delete failed:', error);
      onError?.(row, error.message || t('Löschen fehlgeschlagen'));
      // Refetch to restore the item in case of failure
      await refetch();
    } finally {
      setIsDeleting(false);
    }
  };

  const handleCancelDelete = (e: React.MouseEvent) => {
    e.stopPropagation();
    setIsConfirming(false);
  };

  const buttonTitle = title || t('Löschen');
  const confirmButtonTitle = confirmTitle || t('Sind Sie sicher, dass Sie die {count} ausgewählten Elemente löschen möchten?');
  const cancelButtonTitle = cancelTitle || t('Abbrechen');
  
  // Check if ANY deletion is in progress (not just this specific item)
  const isAnyDeletionInProgress = loadingState && loadingState.size > 0;

  if (isConfirming) {
    return (
      <div className={styles.deleteConfirmButtons}>
        <button
          onClick={handleConfirmDelete}
          className={`${styles.actionButton} ${styles.confirmButton}`}
          title={confirmButtonTitle}
          disabled={isDeleting}
        >
          <span className={styles.actionIcon}>
            <IoIosCheckmark />
          </span>
        </button>
        <button
          onClick={handleCancelDelete}
          className={`${styles.actionButton} ${styles.cancelButton}`}
          title={cancelButtonTitle}
          disabled={isDeleting}
        >
          <span className={styles.actionIcon}>
            <IoIosClose />
          </span>
        </button>
      </div>
    );
  }

  // Determine the final button title (tooltip)
  const finalTitle = isDisabled && disabledMessage ? disabledMessage : buttonTitle;

  return (
    <button
      onClick={handleDeleteClick}
      className={`${styles.actionButton} ${styles.delete} ${loading || isDeleting || isAnyDeletionInProgress ? styles.loading : ''} ${isDisabled ? styles.disabled : ''} ${className}`}
      title={finalTitle}
      disabled={isDisabled || loading || isDeleting || isAnyDeletionInProgress}
    >
      <span className={styles.actionIcon}>
        <IoIosTrash />
      </span>
    </button>
  );
}

export default DeleteActionButton;