import app from '@adonisjs/core/services/app'
import { errors } from '@vinejs/vine'

/**
 * The ValidationService handles manual construction of validation errors
 * that are compatible with the VanillaErrorReporter and AdonisJS Session.
 */
export class ValidationService {
  /**
   * Builds a validation error in the array-of-objects format without throwing it.
   * Use this when you need the error object itself, e.g. multipart.abort(error).
   */
  make(field: string, message: string, rule: string = 'manual') {
    return new errors.E_VALIDATION_ERROR([
      {
        field,
        message,
        rule,
      },
    ])
  }

  /**
   * Throws a manual validation error in the array-of-objects format
   * which prevents the ".reduce is not a function" error in the session.
   */
  throw(field: string, message: string, rule: string = 'manual') {
    throw this.make(field, message, rule)
  }

  /**
   * Throws multiple manual validation errors at once.
   */
  throwMany(errorObjects: Array<{ field: string; message: string; rule?: string }>) {
    throw new errors.E_VALIDATION_ERROR(
      errorObjects.map((err) => ({
        field: err.field,
        message: err.message,
        rule: err.rule || 'manual',
      }))
    )
  }
}

/**
 * Initialize and export the singleton instance
 */
let validation: ValidationService

await app.booted(async () => {
  validation = await app.container.make(ValidationService)
})

export { validation as default }