package transformers

import (
	"context"

	"gitee.com/go-genie/httptransport/validator"
	typex "gitee.com/go-genie/xx/types"
)

type MayValidator interface {
	NewValidator(ctx context.Context, typ typex.Type) (validator.Validator, error)
}

type WithNamedByTag interface {
	NamedByTag() string
}

func NewValidator(
	ctx context.Context,
	fieldType typex.Type,
	tags map[string]Tag,
	omitempty bool,
	transformer Transformer,
) (validator.Validator, error) {
	if withNamedByTag, ok := transformer.(WithNamedByTag); ok {
		if namedTagKey := withNamedByTag.NamedByTag(); namedTagKey != "" {
			ctx = validator.ContextWithNamedTagKey(ctx, namedTagKey)
		}
	}

	if t, ok := transformer.(MayValidator); ok {
		return t.NewValidator(ctx, fieldType)
	}

	mgr := validator.ValidatorMgrFromContext(ctx)

	tagValidate := tags["validate"]

	return mgr.Compile(
		ctx, []byte(tagValidate), fieldType, func(rule validator.RuleModifier) {
			if omitempty {
				rule.SetOptional(true)
			}
			if defaultValue, ok := tags["default"]; ok {
				rule.SetDefaultValue([]byte(defaultValue))
			}
		},
	)
}