package api

import (
	"context"
	"fmt"
	"github.com/google/uuid"
	"google.golang.org/protobuf/proto"

	auditV1 "dev.azure.com/schwarzit/schwarzit.stackit-core-platform/common-audit.git/gen/go/audit/v1"

	"github.com/bufbuild/protovalidate-go"
)

// MockAuditApi is an implementation of AuditApi that does nothing and has no dependency to external systems.
type MockAuditApi struct {
	validator *ProtobufValidator
}

func NewMockAuditApi() (*AuditApi, error) {
	validator, err := protovalidate.New()
	if err != nil {
		return nil, err
	}
	var protobufValidator ProtobufValidator = validator
	var auditApi AuditApi = &MockAuditApi{validator: &protobufValidator}
	return &auditApi, nil
}

// Log implements AuditApi.Log.
// Validates and serializes the event but doesn't send it.
func (a *MockAuditApi) Log(
	_ context.Context,
	event *auditV1.AuditLogEntry,
	visibility auditV1.Visibility,
	routingIdentifier *RoutingIdentifier,
	objectIdentifier *auditV1.ObjectIdentifier,
) error {

	_, err := a.ValidateAndSerialize(event, visibility, routingIdentifier, objectIdentifier)
	return err
}

// ValidateAndSerialize implements AuditApi.ValidateAndSerialize
func (a *MockAuditApi) ValidateAndSerialize(
	event *auditV1.AuditLogEntry,
	visibility auditV1.Visibility,
	routingIdentifier *RoutingIdentifier,
	objectIdentifier *auditV1.ObjectIdentifier,
) (*CloudEvent, error) {

	routableEvent, err := validateAndSerializePartially(a.validator, event, visibility, routingIdentifier, objectIdentifier)
	if err != nil {
		return nil, err
	}

	routableEventBytes, err := proto.Marshal(routableEvent)
	if err != nil {
		return nil, err
	}

	message := CloudEvent{
		specVersion: "1.0",
		source:      event.ProtoPayload.ServiceName,
		// TODO what is the correct id?
		id:              uuid.NewString(),
		time:            event.ProtoPayload.RequestMetadata.RequestAttributes.Time.AsTime(),
		dataContentType: "application/cloudevents+protobuf",
		dataType:        fmt.Sprintf("%v", routableEvent.ProtoReflect().Descriptor().FullName()),
		// TODO check if this is correct
		subject: event.ProtoPayload.ResourceName,
		data:    routableEventBytes,
	}

	return &message, nil
}

// Send implements AuditApi.Send
func (a *MockAuditApi) Send(context.Context, *RoutingIdentifier, *CloudEvent) error {
	return nil
}