/**
 * RealEstateParcelsView
 *
 * Parzellen-Verwaltung für eine Real Estate/PEK-Instanz.
 * Verwendet FormGeneratorTable analog zu TrusteeDocumentsView.
 */

import React, { useState, useMemo, useEffect } from 'react';
import {
  useRealEstateParcels,
  useRealEstateParcelOperations,
  type RealEstateParcel,
} from '../../../hooks/useRealEstate';
import { useInstanceId } from '../../../hooks/useCurrentInstance';
import { FormGeneratorTable } from '../../../components/FormGenerator/FormGeneratorTable';
import { FormGeneratorForm } from '../../../components/FormGenerator/FormGeneratorForm';
import { FaSync } from 'react-icons/fa';
import styles from '../../admin/Admin.module.css';

import { useLanguage } from '../../../providers/language/LanguageContext';
import { resolveColumnTypes } from '../../../utils/columnTypeResolver';

export const RealEstateParcelsView: React.FC = () => {
    const { t } = useLanguage();

  const instanceId = useInstanceId();

  const {
    items: parcels,
    attributes,
    permissions,
    pagination,
    loading,
    error,
    refetch,
    fetchById,
    updateOptimistically,
    removeOptimistically,
  } = useRealEstateParcels();

  const {
    handleDelete,
    handleCreate,
    handleUpdate,
    deletingItems,
  } = useRealEstateParcelOperations();

  const [editingParcel, setEditingParcel] = useState<RealEstateParcel | null>(null);
  const [isCreateMode, setIsCreateMode] = useState(false);

  useEffect(() => {
    if (instanceId) {
      refetch();
    }
  }, [instanceId, refetch]);

  const columns = useMemo(() => {
    const raw = (attributes || []).map(attr => ({
      key: attr.name,
      label: attr.label || attr.name,
      sortable: attr.sortable !== false,
      filterable: attr.filterable !== false,
      searchable: attr.searchable !== false,
      width: attr.width || 150,
      minWidth: attr.minWidth || 100,
      maxWidth: attr.maxWidth || 400,
      displayField: (attr as any).displayField,
    }));
    return resolveColumnTypes(raw, attributes || []);
  }, [attributes]);

  const canCreate = permissions?.create !== 'n';
  const canUpdate = permissions?.update !== 'n';
  const canDelete = permissions?.delete !== 'n';

  const handleEditClick = async (parcel: RealEstateParcel) => {
    const full = await fetchById(parcel.id);
    if (full) {
      setEditingParcel(full);
      setIsCreateMode(false);
    }
  };

  const handleCreateClick = () => {
    setEditingParcel(null);
    setIsCreateMode(true);
  };

  const handleFormSubmit = async (data: Partial<RealEstateParcel>) => {
    if (isCreateMode) {
      const result = await handleCreate(data);
      if (result.success) {
        setIsCreateMode(false);
        refetch();
      }
    } else if (editingParcel) {
      const result = await handleUpdate(editingParcel.id, data);
      if (result.success) {
        setEditingParcel(null);
        refetch();
      }
    }
  };

  const handleDeleteParcel = async (parcel: RealEstateParcel) => {
    removeOptimistically(parcel.id);
    const success = await handleDelete(parcel.id);
    if (!success) {
      refetch();
    }
  };

  const handleCloseModal = () => {
    setEditingParcel(null);
    setIsCreateMode(false);
  };

  const formAttributes = useMemo(() => {
    const excluded = ['id', 'mandateId', 'instanceId', 'sysCreatedBy', 'sysCreatedAt', 'sysModifiedAt', 'sysModifiedBy'];
    return (attributes || []).filter(attr => !excluded.includes(attr.name));
  }, [attributes]);

  const handleInlineUpdate = async (
    itemId: string,
    updateData: Partial<RealEstateParcel>,
    row: RealEstateParcel
  ) => {
    updateOptimistically(itemId, updateData);
    const result = await handleUpdate(itemId, { ...row, ...updateData });
    if (!result.success) {
      refetch();
    }
  };

  if (error) {
    return (
      <div className={styles.adminPage}>
        <div className={styles.errorContainer}>
          <span className={styles.errorIcon}>⚠️</span>
          <p className={styles.errorMessage}>Fehler beim Laden der Parzellen: {error}</p>
          <button className={styles.secondaryButton} onClick={() => refetch()}>
            <FaSync /> Erneut versuchen
          </button>
        </div>
      </div>
    );
  }

  return (
    <div className={`${styles.adminPage} ${styles.adminPageFill}`}>
      <div className={styles.pageHeader}>
        <div>
          <p className={styles.pageSubtitle}>{t('Parzellen verwalten')}</p>
        </div>
        <div className={styles.headerActions}>
          <button
            className={styles.secondaryButton}
            onClick={() => refetch()}
            disabled={loading}
          >
            <FaSync className={loading ? 'spinning' : ''} /> Aktualisieren
          </button>
          {canCreate && (
            <button className={styles.primaryButton} onClick={handleCreateClick}>
              + Neue Parzelle
            </button>
          )}
        </div>
      </div>

      <div className={styles.tableContainer}>
        <FormGeneratorTable
            data={parcels}
            columns={columns}
            loading={loading}
            pagination={true}
            pageSize={25}
            searchable={true}
            filterable={true}
            sortable={true}
            selectable={true}
            apiEndpoint={instanceId ? `/api/realestate/${instanceId}/parcels` : undefined}
            actionButtons={[
              ...(canUpdate
                ? [
                    {
                      type: 'edit' as const,
                      onAction: handleEditClick,
                      title: t('Bearbeiten'),
                    },
                  ]
                : []),
              ...(canDelete
                ? [
                    {
                      type: 'delete' as const,
                      title: t('Löschen'),
                      loading: (row: RealEstateParcel) => deletingItems.has(row.id),
                    },
                  ]
                : []),
            ]}
            onDelete={handleDeleteParcel}
            hookData={{
              refetch,
              permissions,
              pagination,
              handleDelete,
              handleInlineUpdate,
              updateOptimistically,
            }}
            emptyMessage={t('Keine Parzellen gefunden')}
          />
      </div>

      {(editingParcel || isCreateMode) && (
        <div className={styles.modalOverlay}>
          <div className={styles.modal}>
            <div className={styles.modalHeader}>
              <h2 className={styles.modalTitle}>
                {isCreateMode ? t('Neue Parzelle') : t('Parzelle bearbeiten')}
              </h2>
              <button className={styles.modalClose} onClick={handleCloseModal}>
                ✕
              </button>
            </div>
            <div className={styles.modalContent}>
              {formAttributes.length === 0 ? (
                <div className={styles.loadingContainer}>
                  <div className={styles.spinner} />
                  <span>{t('Formular laden')}</span>
                </div>
              ) : (
                <FormGeneratorForm
                  attributes={formAttributes}
                  data={editingParcel || {}}
                  mode={isCreateMode ? 'create' : 'edit'}
                  onSubmit={handleFormSubmit}
                  onCancel={handleCloseModal}
                  submitButtonText={isCreateMode ? t('Erstellen') : t('Speichern')}
                  cancelButtonText={t('Abbrechen')}
                  instanceId={instanceId}
                />
              )}
            </div>
          </div>
        </div>
      )}
    </div>
  );
};

export default RealEstateParcelsView;