package playground

import (
	"context"
	"log"
	"reflect"
	"testing"

	"github.com/go-playground/assert/v2"
	"github.com/go-playground/mold/v4"
	"github.com/go-playground/mold/v4/modifiers"
	"github.com/moznion/go-optional"
)

var tform *mold.Transformer

type UpdateCustomerDTO struct {
	FirstName optional.Option[string] `mod:"trim"`
}

func TestMoldTrimOnOptional(t *testing.T) {
	tform = modifiers.New()

	tform.RegisterInterceptor(func(current reflect.Value) (inner reflect.Value) {
		opt, ok := current.Interface().(optional.Option[string])
		if !ok {
			return current
		} else if opt.IsNone() {
			return reflect.ValueOf(nil)
		}
		return current.Index(0)
	}, optional.Option[string]{})

	dto := UpdateCustomerDTO{FirstName: optional.Some(" RaviAnand ")}

	err := tform.Struct(context.Background(), &dto)
	if err != nil {
		log.Fatal(err)
	}

	assert.Equal(t, dto.FirstName.Unwrap(), "RaviAnand")
}