package validjson

import (
	"context"
	"encoding/json"

	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
)

const Key = "generic/valid_json"
const ReasonCodeInvalidJSON = "invalid_json"

var _ contracts.Validator = (*Validator)(nil)

type Validator struct{}

func New() *Validator {
	return &Validator{}
}

func (v *Validator) Name() string {
	return Key
}

func (v *Validator) ExecutionClass() contracts.ExecutionClass {
	return contracts.ExecutionClassDeterministic
}

func (v *Validator) Validate(ctx context.Context, req contracts.ValidationRequest) (contracts.ValidationResult, error) {
	if !json.Valid(req.Payload.Content) {
		return contracts.ValidationResult{
			Approved:   false,
			ReasonCode: ReasonCodeInvalidJSON,
			Message:    "payload is not valid JSON",
		}, nil
	}
	return contracts.ValidationResult{Approved: true}, nil
}

func Spec() pipeline.ValidatorSpec {
	return pipeline.ValidatorSpec{
		Key:            Key,
		ExecutionClass: contracts.ExecutionClassDeterministic,
	}
}

func Register(registry *pipeline.ValidatorRegistry) error {
	return registry.RegisterWithSpec(Spec(), func() (contracts.Validator, error) {
		return New(), nil
	})
}