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[] {
  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 : [];
    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}".`
      );
    }

    return data.map(item => ({
      key: String(item[enumOption.key]),
      value: resolveTemplate(enumOption.value, item),
    }));
  }

  return [];
}

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