import { VineMultipartFile } from '@adonisjs/core/vine'
import { OptionalModifier } from '@vinejs/vine/schema/base/literal'
import vine from '@vinejs/vine'

/**
 * Creates a reusable upload file schema that requires either:
 * - `ref` (reference to an existing file), or
 * - `file` (new uploaded file).
 *
 * At least one field must be present. When `ref` is missing, `file`
 * becomes required. When `file` is missing, `ref` becomes required.
 *
 * @param fileScheme Custom optional file validation schema.
 * @returns Vine object schema with mutually dependent `ref` and `file` fields.
 */
export default function createFileInputSchema(
  fileScheme: OptionalModifier<VineMultipartFile> = vine.file({ size: '5mb' }).optional()
) {
  return vine.object({
    ref: vine.string().optional().requiredIfMissing('file'),
    file: fileScheme.requiredIfMissing('ref'),
  })
}