'use client';

import type { CmsFieldType } from '../schema/module.schema';

interface FieldDefinition {
  name: string;
  display_name: string;
  field_type: CmsFieldType;
  show_in_table: boolean;
  is_sortable: boolean;
  sort_order: number;
}

interface ModuleRecord {
  id: string;
  data: Record<string, unknown>;
  status: string;
  created_at: string;
  updated_at: string;
}

interface Pagination {
  page: number;
  pageSize: number;
  total: number;
  totalPages: number;
}

interface ModuleTableProps {
  fields: FieldDefinition[];
  records: ModuleRecord[];
  pagination: Pagination;
  onPageChange: (page: number) => void;
  onSort: (field: string, direction: 'asc' | 'desc') => void;
  onRowClick?: (recordId: string) => void;
  selectedIds?: Set<string>;
  onSelectionChange?: (ids: Set<string>) => void;
  currentSort?: { field: string; direction: 'asc' | 'desc' };
}

/**
 * Dynamic data table driven by module field definitions.
 * Replaces the legacy my_modulklasse table rendering.
 * Uses native table for now; Phase 3 enhancement will use @kit/ui/data-table.
 */
export function ModuleTable({
  fields,
  records,
  pagination,
  onPageChange,
  onSort,
  onRowClick,
  selectedIds = new Set(),
  onSelectionChange,
  currentSort,
}: ModuleTableProps) {
  const visibleFields = fields
    .filter((f) => f.show_in_table)
    .sort((a, b) => a.sort_order - b.sort_order);

  const formatCellValue = (value: unknown, fieldType: CmsFieldType): string => {
    if (value == null || value === '') return '—';

    switch (fieldType) {
      case 'checkbox':
        return value ? '✓' : '✗';
      case 'currency':
        return new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(Number(value));
      case 'date':
        try { return new Date(String(value)).toLocaleDateString('de-DE'); } catch { return String(value); }
      case 'password':
        return '••••••';
      default:
        return String(value);
    }
  };

  const handleSort = (fieldName: string) => {
    const newDirection = currentSort?.field === fieldName && currentSort.direction === 'asc'
      ? 'desc' : 'asc';
    onSort(fieldName, newDirection);
  };

  return (
    <div className="space-y-4">
      <div className="rounded-md border overflow-auto">
        <table className="w-full text-sm">
          <thead>
            <tr className="border-b bg-muted/50">
              {onSelectionChange && (
                <th className="p-3 w-10">
                  <input
                    type="checkbox"
                    checked={records.length > 0 && records.every((r) => selectedIds.has(r.id))}
                    onChange={(e) => {
                      if (e.target.checked) {
                        onSelectionChange(new Set(records.map((r) => r.id)));
                      } else {
                        onSelectionChange(new Set());
                      }
                    }}
                  />
                </th>
              )}
              {visibleFields.map((field) => (
                <th
                  key={field.name}
                  className="p-3 text-left font-medium cursor-pointer hover:bg-muted/80 select-none"
                  onClick={() => field.is_sortable && handleSort(field.name)}
                >
                  <span className="flex items-center gap-1">
                    {field.display_name}
                    {currentSort?.field === field.name && (
                      <span className="text-xs">{currentSort.direction === 'asc' ? '↑' : '↓'}</span>
                    )}
                  </span>
                </th>
              ))}
            </tr>
          </thead>
          <tbody>
            {records.length === 0 ? (
              <tr>
                <td
                  colSpan={visibleFields.length + (onSelectionChange ? 1 : 0)}
                  className="p-8 text-center text-muted-foreground"
                >
                  Keine Datensätze gefunden
                </td>
              </tr>
            ) : (
              records.map((record) => (
                <tr
                  key={record.id}
                  className="border-b hover:bg-muted/30 cursor-pointer transition-colors"
                  onClick={() => onRowClick?.(record.id)}
                >
                  {onSelectionChange && (
                    <td className="p-3" onClick={(e) => e.stopPropagation()}>
                      <input
                        type="checkbox"
                        checked={selectedIds.has(record.id)}
                        onChange={(e) => {
                          const next = new Set(selectedIds);
                          if (e.target.checked) {
                            next.add(record.id);
                          } else {
                            next.delete(record.id);
                          }
                          onSelectionChange(next);
                        }}
                      />
                    </td>
                  )}
                  {visibleFields.map((field) => (
                    <td key={field.name} className="p-3">
                      {formatCellValue(record.data[field.name], field.field_type)}
                    </td>
                  ))}
                </tr>
              ))
            )}
          </tbody>
        </table>
      </div>

      {/* Pagination */}
      {pagination.totalPages > 1 && (
        <div className="flex items-center justify-between px-2">
          <span className="text-sm text-muted-foreground">
            {pagination.total} Datensätze — Seite {pagination.page} von {pagination.totalPages}
          </span>
          <div className="flex gap-1">
            <button
              onClick={() => onPageChange(pagination.page - 1)}
              disabled={pagination.page <= 1}
              className="rounded border px-3 py-1 text-sm hover:bg-muted disabled:opacity-50"
            >
              ← Zurück
            </button>
            <button
              onClick={() => onPageChange(pagination.page + 1)}
              disabled={pagination.page >= pagination.totalPages}
              className="rounded border px-3 py-1 text-sm hover:bg-muted disabled:opacity-50"
            >
              Weiter →
            </button>
          </div>
        </div>
      )}
    </div>
  );
}