import { Product, ProductModule, Category, WizardSelections } from './types';

/**
 * Handle toggling of a module selection.
 * Handles category-specific allow_multiselect rules.
 */
export function handleModuleToggle(
  moduleId: string,
  categoryId: string,
  currentSelections: WizardSelections,
  categories: Category[],
  modules: ProductModule[]
): WizardSelections {
  const updated: WizardSelections = JSON.parse(JSON.stringify(currentSelections));
  const category = categories.find(c => c.id === categoryId);
  const allowMultiple = category ? category.allow_multiselect : true;

  if (!updated[categoryId]) {
    updated[categoryId] = { productId: null, moduleIds: [] };
  }

  const selection = updated[categoryId];
  const isSelected = selection.moduleIds.includes(moduleId);

  if (isSelected) {
    // Toggle off
    selection.moduleIds = selection.moduleIds.filter(id => id !== moduleId);
  } else {
    // Toggle on
    if (!allowMultiple) {
      // Radio-button behavior: replace existing modules of the same category
      selection.moduleIds = [moduleId];
    } else {
      selection.moduleIds.push(moduleId);
    }
  }

  return updated;
}