import { z } from 'zod'

import Response, { ResponseErrorType } from '../API/Response.js'
import Globals from '../Globals.js'

/**
 * Validates the given data against the provided schema.
 * @param {any} data - The data to be validated.
 * @param {z.ZodObject<any> | z.ZodUnion<any> | z.ZodIntersection<any, any> | z.ZodEffects<any>} schema - The schema to validate against.
 * @returns {boolean | Response<ResponseErrorType>} - Returns true if the data is valid, otherwise returns a response object with an error message.
 */
export default class Validator {
  /**
   * Validates the given data against the provided schema.
   * @param {any} data - The data to be validated.
   * @param {z.ZodObject<any> | z.ZodUnion<any> | z.ZodIntersection<any, any> | z.ZodEffects<any>} schema - The schema to validate against.
   * @returns {boolean | Response<ResponseErrorType>} - Returns either true if the data is valid or a Response object with an error message if validation fails.
   */
  public static validateSchema(
    data: any,
    schema: z.ZodObject<any> | z.ZodUnion<any> | z.ZodIntersection<any, any> | z.ZodEffects<any>
  ): boolean | Response<ResponseErrorType> {
    let error, validatedInput

    // Validate body against known zod schema
    try {
      schema.parse(data)
      validatedInput = true
    } catch (err: z.ZodError | any) {
      if (err instanceof z.ZodError) error = JSON.parse(err.message)
      else error = 'Unknown validation error!' //unhandled case, hard to test
    }

    // Error validation
    if (!validatedInput || error) {
      return Response.BadRequestResponse(
        Globals.ErrorResponseValidationFail,
        Globals.ErrorCode_InvalidInput,
        { validationFailure: error }
      )
    } else {
      return true
    }
  }
}