import { ResourceField, SelectOption } from "../types/config";

export function resolveTemplate(template: string, item: any): string {
  if (/\{(\w+)\}/.test(template)) {
    return template.replace(/\{(\w+)\}/g, (_, field: string) => String(item[field] ?? ''));
  }
  return String(item[template] ?? '');
}

export function getFieldOptions(field: ResourceField, relationData?: any[]): SelectOption[] {
  console.log('getFieldOptions called for field', field.label, 'type', field.type, 'enumOption', field.enumOption);
  if (field.type === 'enum') {
    return (field.options ?? []).map(opt => ({
      key: opt,
      value: field.enumLabels?.[opt] ?? opt,
    }));
  }

  if (field.relation) {
    const data = Array.isArray(relationData) ? relationData : [];
    console.log('Getting options for relation', field.relation, 'data count:', data.length);
    if (data.length === 0) {
      throw new Error(`Relation data for "${field.relation}" is missing or empty – cannot build options for field "${field.label}"`);
    }
    const enumOption = field.enumOption;
    if (!enumOption) {
      throw new Error(
        `Missing enumOption for relation "${field.relation}" on field "${field}". ` +
        `Define referenceOptions.enumOption in the configuration for resource "${field.relation}".`
      );
    }
    const result = data.map(item => ({
      key: String(item[enumOption.key] ?? item.id ?? item._id),
      value: resolveTemplate(enumOption.value, item),
    }));
    console.log('Option map for', field.relation, 'first entry:', data[0], 'result key:', result[0]?.key);
    return result;
  }

  return [];
}

export function toGridValueOptions(options: SelectOption[]): { value: string; label: string }[] {
  return options.map(opt => ({ value: opt.key, label: opt.value }));
}