package api

import (
	auditV1 "dev.azure.com/schwarzit/schwarzit.stackit-public/audit-go.git/gen/go/audit/v1"
	"encoding/json"
	"fmt"
	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/types/known/structpb"
	"google.golang.org/protobuf/types/known/timestamppb"
	"google.golang.org/protobuf/types/known/wrapperspb"
	"net/http"
	"net/url"
	"testing"
	"time"
)

func Test_GetCalledServiceNameFromRequest(t *testing.T) {

	t.Run("request is nil", func(t *testing.T) {
		serviceName := GetCalledServiceNameFromRequest(nil, "resource-manager")
		assert.Equal(t, "resource-manager", serviceName)
	})

	t.Run("localhost", func(t *testing.T) {
		request := ApiRequest{Host: "localhost:8080"}
		serviceName := GetCalledServiceNameFromRequest(&request, "resource-manager")
		assert.Equal(t, "resource-manager", serviceName)
	})

	t.Run("cf", func(t *testing.T) {
		request := ApiRequest{Host: "stackit-resource-manager-go-dev.apps.01.cf.eu01.stackit.cloud"}
		serviceName := GetCalledServiceNameFromRequest(&request, "resource-manager")
		assert.Equal(t, "stackit-resource-manager-go-dev", serviceName)
	})

	t.Run("cf invalid host", func(t *testing.T) {
		request := ApiRequest{Host: ""}
		serviceName := GetCalledServiceNameFromRequest(&request, "resource-manager")
		assert.Equal(t, "resource-manager", serviceName)
	})

	t.Run("ip", func(t *testing.T) {
		request := ApiRequest{Host: "127.0.0.1"}
		serviceName := GetCalledServiceNameFromRequest(&request, "resource-manager")
		assert.Equal(t, "resource-manager", serviceName)
	},
	)

	t.Run("ip short", func(t *testing.T) {
		request := ApiRequest{Host: "::1"}
		serviceName := GetCalledServiceNameFromRequest(&request, "resource-manager")
		assert.Equal(t, "resource-manager", serviceName)
	},
	)
}

func Test_NewPbInt64Value(t *testing.T) {

	t.Run("nil", func(t *testing.T) {
		value := NewPbInt64Value(nil)
		assert.Nil(t, value)
	})

	t.Run("value", func(t *testing.T) {
		var input int64 = 1
		value := NewPbInt64Value(&input)
		assert.Equal(t, wrapperspb.Int64Value{Value: 1}.Value, value.Value)
	})
}

func Test_NewResponseMetadata(t *testing.T) {

	headers := make(map[string]string)
	headers["Content-Type"] = "application/json"
	responseTime := time.Now().UTC()
	responseItems := int64(10)
	responseSize := int64(100)

	t.Run("no error", func(t *testing.T) {
		for code := 1; code < 400; code++ {
			metadata := NewResponseMetadata(code, &responseItems, &responseSize, headers, responseTime)
			assert.Equal(t, wrapperspb.Int32(int32(code)).Value, metadata.StatusCode.Value)
			assert.Nil(t, metadata.ErrorMessage)
			assert.Nil(t, metadata.ErrorDetails)
			assert.Equal(t, wrapperspb.Int64(responseItems), metadata.ResponseAttributes.NumResponseItems)
			assert.Equal(t, wrapperspb.Int64(responseSize), metadata.ResponseAttributes.Size)
			assert.Equal(t, timestamppb.New(responseTime), metadata.ResponseAttributes.Time)
		}
	})

	t.Run("client error", func(t *testing.T) {
		for code := 400; code < 500; code++ {
			metadata := NewResponseMetadata(code, nil, nil, headers, responseTime)
			assert.Equal(t, wrapperspb.Int32(int32(code)).Value, metadata.StatusCode.Value)
			assert.Equal(t, "Client error", *metadata.ErrorMessage)
			assert.Nil(t, metadata.ErrorDetails)
			assert.Nil(t, metadata.ResponseAttributes.NumResponseItems)
			assert.Nil(t, metadata.ResponseAttributes.Size)
			assert.Equal(t, timestamppb.New(responseTime), metadata.ResponseAttributes.Time)
		}
	})

	t.Run("server error", func(t *testing.T) {
		for code := 500; code < 600; code++ {
			metadata := NewResponseMetadata(code, nil, nil, headers, responseTime)
			assert.Equal(t, wrapperspb.Int32(int32(code)).Value, metadata.StatusCode.Value)
			assert.Equal(t, "Server error", *metadata.ErrorMessage)
			assert.Nil(t, metadata.ErrorDetails)
			assert.Nil(t, metadata.ResponseAttributes.NumResponseItems)
			assert.Nil(t, metadata.ResponseAttributes.Size)
			assert.Equal(t, timestamppb.New(responseTime), metadata.ResponseAttributes.Time)
		}
	})
}

func Test_NewRequestMetadata(t *testing.T) {

	userAgent := "userAgent"
	requestHeaders := make(map[string][]string)
	requestHeaders["User-Agent"] = []string{userAgent}
	requestHeaders["Custom"] = []string{"customHeader"}

	queryString := "topic=project"
	request := ApiRequest{
		Method: "GET",
		URL:    RequestUrl{Path: "/audit/new", RawQuery: &queryString},
		Host:   "localhost:8080",
		Proto:  "HTTP/1.1",
		Scheme: "http",
		Header: requestHeaders,
	}

	requestId := "requestId"
	requestScheme := "requestScheme"
	requestTime := time.Now().UTC()

	audiences := []string{"audience"}
	authenticationPrincipal := "authenticationPrincipal"

	claimMap := make(map[string]interface{})
	auditClaims, _ := structpb.NewStruct(claimMap)

	clientIp := "clientIp"

	filteredHeaders := make(map[string]string)
	filteredHeaders["Custom"] = "customHeader"
	filteredHeaders["User-Agent"] = userAgent

	verifyRequestMetadata := func(requestMetadata *auditV1.RequestMetadata, requestId *string) {
		assert.Equal(t, clientIp, requestMetadata.CallerIp)
		assert.Equal(t, userAgent, requestMetadata.CallerSuppliedUserAgent)
		assert.NotNil(t, requestMetadata.RequestAttributes)

		attributes := requestMetadata.RequestAttributes
		assert.Equal(t, requestId, attributes.Id)
		assert.Equal(t, filteredHeaders, attributes.Headers)
		assert.Equal(t, request.URL.Path, attributes.Path)
		assert.Equal(t, request.Host, attributes.Host)
		assert.Equal(t, requestScheme, attributes.Scheme)
		assert.Equal(t, timestamppb.New(requestTime), attributes.Time)
		assert.Equal(t, request.Proto, attributes.Protocol)
		assert.NotNil(t, attributes.Auth)

		auth := attributes.Auth
		assert.Equal(t, authenticationPrincipal, auth.Principal)
		assert.Equal(t, audiences, auth.Audiences)
		assert.Equal(t, auditClaims, auth.Claims)
	}

	t.Run("with query parameters", func(t *testing.T) {
		requestMetadata := NewRequestMetadata(
			&request,
			filteredHeaders,
			&requestId,
			requestScheme,
			requestTime,
			clientIp,
			authenticationPrincipal,
			audiences,
			auditClaims,
		)

		verifyRequestMetadata(requestMetadata, &requestId)
		assert.Equal(t, "topic%3Dproject", *requestMetadata.RequestAttributes.Query)
	})

	t.Run("without query parameters", func(t *testing.T) {
		request := ApiRequest{
			Method: "GET",
			URL:    RequestUrl{Path: "/audit/new"},
			Host:   "localhost:8080",
			Proto:  "HTTP/1.1",
			Header: requestHeaders,
		}

		requestMetadata := NewRequestMetadata(
			&request,
			filteredHeaders,
			&requestId,
			requestScheme,
			requestTime,
			clientIp,
			authenticationPrincipal,
			audiences,
			auditClaims,
		)

		verifyRequestMetadata(requestMetadata, &requestId)
		assert.Nil(t, requestMetadata.RequestAttributes.Query)
	})

	t.Run("with empty query parameters", func(t *testing.T) {
		emptyQuery := ""
		request := ApiRequest{
			Method: "GET",
			URL:    RequestUrl{Path: "/audit/new", RawQuery: &emptyQuery},
			Host:   "localhost:8080",
			Proto:  "HTTP/1.1",
			Header: requestHeaders,
		}

		requestMetadata := NewRequestMetadata(
			&request,
			filteredHeaders,
			&requestId,
			requestScheme,
			requestTime,
			clientIp,
			authenticationPrincipal,
			audiences,
			auditClaims,
		)

		verifyRequestMetadata(requestMetadata, &requestId)
		assert.Nil(t, requestMetadata.RequestAttributes.Query)
	})

	t.Run("without request id", func(t *testing.T) {
		request := ApiRequest{
			Method: "GET",
			URL:    RequestUrl{Path: "/audit/new", RawQuery: &queryString},
			Host:   "localhost:8080",
			Proto:  "HTTP/1.1",
			Header: requestHeaders,
		}

		requestMetadata := NewRequestMetadata(
			&request, filteredHeaders,
			nil,
			requestScheme,
			requestTime,
			clientIp,
			authenticationPrincipal,
			audiences,
			auditClaims,
		)
		verifyRequestMetadata(requestMetadata, nil)
	})

	t.Run("various default http methods", func(t *testing.T) {
		httpMethods := []string{"GET", "HEAD", "POST", "PUT", "DELETE", "CONNECT", "OPTIONS", "TRACE", "PATCH"}
		for _, httpMethod := range httpMethods {
			request := ApiRequest{
				Method: httpMethod,
				URL:    RequestUrl{Path: "/audit/new", RawQuery: &queryString},
				Host:   "localhost:8080",
				Proto:  "HTTP/1.1",
				Header: requestHeaders,
			}

			requestMetadata := NewRequestMetadata(
				&request, filteredHeaders,
				&requestId, requestScheme,
				requestTime, clientIp,
				authenticationPrincipal,
				audiences,
				auditClaims,
			)

			verifyRequestMetadata(requestMetadata, &requestId)
			expectedMethod := fmt.Sprintf("HTTP_METHOD_%s", httpMethod)
			assert.Equal(t, expectedMethod, requestMetadata.RequestAttributes.Method.String())
		}
	})

	t.Run("unknown http method", func(t *testing.T) {
		request := ApiRequest{
			Method: "",
			URL:    RequestUrl{Path: "/audit/new", RawQuery: &queryString},
			Host:   "localhost:8080",
			Proto:  "HTTP/1.1",
			Header: requestHeaders,
		}

		requestMetadata := NewRequestMetadata(
			&request, filteredHeaders,
			&requestId, requestScheme,
			requestTime, clientIp,
			authenticationPrincipal,
			audiences,
			auditClaims,
		)

		verifyRequestMetadata(requestMetadata, &requestId)
		assert.Equal(t,
			auditV1.AttributeContext_HTTP_METHOD_UNSPECIFIED.String(),
			requestMetadata.RequestAttributes.Method.String())

	})
}

func Test_FilterAndMergeRequestHeaders(t *testing.T) {

	t.Run("skip headers", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Authorization"] = []string{"ey..."}
		headers["authorization"] = []string{"ey..."}
		headers["B3"] = []string{"80f198ee56343ba864fe8b2a57d3eff7-e457b5a2e4d86bd1-1-05e3ac9a4f6e3b90"}
		headers["b3"] = []string{"80f198ee56343ba864fe8b2a57d3eff7-e457b5a2e4d86bd1-1-05e3ac9a4f6e3b90"}
		headers["Host"] = []string{"localhost:9090"}
		headers["host"] = []string{"localhost:9090"}
		headers[":authority"] = []string{"localhost:9090"}

		filteredHeaders := FilterAndMergeHeaders(headers)
		assert.Equal(t, 0, len(filteredHeaders))
	})

	t.Run("skip headers by prefix", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["X-Forwarded-Proto"] = []string{"https"}
		headers["Stackit-test"] = []string{"test"}

		filteredHeaders := FilterAndMergeHeaders(headers)
		assert.Equal(t, 0, len(filteredHeaders))
	})

	t.Run("merge headers", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Custom1"] = []string{"value1", "value2"}
		headers["Custom2"] = []string{"value3", "value4"}

		filteredHeaders := FilterAndMergeHeaders(headers)
		assert.Equal(t, 2, len(filteredHeaders))
		assert.Equal(t, "value1,value2", filteredHeaders["Custom1"])
		assert.Equal(t, "value3,value4", filteredHeaders["Custom2"])
	})

	t.Run("skip merge headers mixed", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Custom1"] = []string{"value1", "value2"}
		headers["Custom2"] = []string{"value3"}
		headers["STACKIT-MIXED"] = []string{"test"}

		filteredHeaders := FilterAndMergeHeaders(headers)
		assert.Equal(t, 2, len(filteredHeaders))
		assert.Equal(t, "value1,value2", filteredHeaders["Custom1"])
		assert.Equal(t, "value3", filteredHeaders["Custom2"])
	})

	t.Run("Keep empty and blank header values", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["empty"] = []string{""}
		headers["blank"] = []string{" "}
		filteredHeaders := FilterAndMergeHeaders(headers)
		assert.Equal(t, 2, len(filteredHeaders))
		assert.Equal(t, "", filteredHeaders["empty"])
		assert.Equal(t, " ", filteredHeaders["blank"])
	})
}

func Test_AuditAttributesFromAuthorizationHeader(t *testing.T) {

	t.Run("basic token", func(t *testing.T) {
		headerValue := "Basic username:password"
		headers := make(map[string][]string)
		headers["Authorization"] = []string{headerValue}
		request := ApiRequest{Header: headers}

		_, _, _, _, err := AuditAttributesFromAuthorizationHeader(&request)
		assert.ErrorIs(t, err, ErrTokenIsNotBearerToken)
	})

	t.Run("invalid header value", func(t *testing.T) {
		headerValue := "a b c"
		headers := make(map[string][]string)
		headers["Authorization"] = []string{headerValue}
		request := ApiRequest{Header: headers}

		_, _, _, _, err := AuditAttributesFromAuthorizationHeader(&request)
		assert.ErrorIs(t, err, ErrInvalidAuthorizationHeaderValue)
	})

	t.Run("invalid token too many parts", func(t *testing.T) {
		headerValue := "Bearer a.b.c.d"
		headers := make(map[string][]string)
		headers["Authorization"] = []string{headerValue}
		request := ApiRequest{Header: headers}

		_, _, _, _, err := AuditAttributesFromAuthorizationHeader(&request)
		assert.ErrorIs(t, err, ErrInvalidBearerToken)
	})

	t.Run("invalid bearer token", func(t *testing.T) {
		headerValue := "Bearer a.b.c"
		headers := make(map[string][]string)
		headers["Authorization"] = []string{headerValue}
		request := ApiRequest{Header: headers}

		_, _, _, _, err := AuditAttributesFromAuthorizationHeader(&request)
		assert.ErrorIs(t, err, ErrInvalidBearerToken)
	})

	t.Run("client credentials token", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Authorization"] = []string{clientCredentialsToken}
		request := ApiRequest{Header: headers}

		auditClaims, authenticationPrincipal, audiences, authenticationInfo, err :=
			AuditAttributesFromAuthorizationHeader(&request)

		auditClaimsMap := auditClaims.AsMap()
		assert.Nil(t, err)
		assert.Equal(t, "https://accounts.dev.stackit.cloud", auditClaimsMap["iss"])
		assert.Equal(t, "stackit-resource-manager-dev", auditClaimsMap["sub"])
		assert.Equal(t, []interface{}{"stackit-resource-manager-dev"}, auditClaimsMap["aud"].([]interface{}))
		assert.Equal(t, "e46eba38-dedb-4541-94f3-49f97a934d58", auditClaimsMap["jti"])

		principal := fmt.Sprintf("%s/%s",
			url.QueryEscape("stackit-resource-manager-dev"),
			url.QueryEscape("https://accounts.dev.stackit.cloud"))
		assert.Equal(t, principal, authenticationPrincipal)

		assert.Equal(t, []string{"stackit-resource-manager-dev"}, audiences)

		assert.Equal(t, "stackit-resource-manager-dev", authenticationInfo.PrincipalId)
		assert.Equal(t, "do-not-reply@stackit.cloud", authenticationInfo.PrincipalEmail)

		assert.Nil(t, authenticationInfo.ServiceAccountName)
		assert.Nil(t, authenticationInfo.ServiceAccountDelegationInfo)
	})

	t.Run("service account access token", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Authorization"] = []string{serviceAccountToken}
		request := ApiRequest{Header: headers}

		auditClaims, authenticationPrincipal, audiences, authenticationInfo, err :=
			AuditAttributesFromAuthorizationHeader(&request)

		auditClaimsMap := auditClaims.AsMap()
		assert.Nil(t, err)
		assert.Equal(t, "stackit/serviceaccount", auditClaimsMap["iss"])
		assert.Equal(t, "10f38b01-534b-47bb-a03a-e294ca2be4de", auditClaimsMap["sub"])
		assert.Equal(t, []interface{}{"stackit", "api"}, auditClaimsMap["aud"].([]interface{}))
		assert.Equal(t, "84c30a46-1001-436f-859f-89c0ba19be1e", auditClaimsMap["jti"])

		principal := fmt.Sprintf("%s/%s",
			url.QueryEscape("10f38b01-534b-47bb-a03a-e294ca2be4de"),
			url.QueryEscape("stackit/serviceaccount"))
		assert.Equal(t, principal, authenticationPrincipal)

		assert.Equal(t, []string{"stackit", "api"}, audiences)

		assert.Equal(t, "10f38b01-534b-47bb-a03a-e294ca2be4de", authenticationInfo.PrincipalId)
		assert.Equal(t, "my-service-yifc9e1@sa.stackit.cloud", authenticationInfo.PrincipalEmail)

		assert.Equal(t,
			"projects/dacc7830-843e-4c5e-86ff-aa0fb51d636f/service-accounts/10f38b01-534b-47bb-a03a-e294ca2be4de",
			*authenticationInfo.ServiceAccountName)
		assert.Nil(t, authenticationInfo.ServiceAccountDelegationInfo)
	})

	t.Run("impersonated token of access token", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Authorization"] = []string{serviceAccountTokenImpersonated}
		request := ApiRequest{Header: headers}

		auditClaims, authenticationPrincipal, audiences, authenticationInfo, err :=
			AuditAttributesFromAuthorizationHeader(&request)

		auditClaimsMap := auditClaims.AsMap()
		assert.Nil(t, err)
		assert.Equal(t, "stackit/serviceaccount", auditClaimsMap["iss"])
		assert.Equal(t, "f45009b2-6433-43c1-b6c7-618c44359e71", auditClaimsMap["sub"])
		assert.Equal(t, []interface{}{"stackit", "api"}, auditClaimsMap["aud"].([]interface{}))
		assert.Equal(t, "37555183-01b9-4270-bdc1-69b4fcfd5ee9", auditClaimsMap["jti"])

		principal := fmt.Sprintf("%s/%s",
			url.QueryEscape("f45009b2-6433-43c1-b6c7-618c44359e71"),
			url.QueryEscape("stackit/serviceaccount"))
		assert.Equal(t, principal, authenticationPrincipal)

		assert.Equal(t, []string{"stackit", "api"}, audiences)

		assert.Equal(t, "f45009b2-6433-43c1-b6c7-618c44359e71", authenticationInfo.PrincipalId)
		assert.Equal(t, "service-account-2-tj9srt1@sa.stackit.cloud", authenticationInfo.PrincipalEmail)

		assert.Equal(t,
			"projects/dacc7830-843e-4c5e-86ff-aa0fb51d636f/service-accounts/f45009b2-6433-43c1-b6c7-618c44359e71",
			*authenticationInfo.ServiceAccountName)
		assert.NotNil(t, authenticationInfo.ServiceAccountDelegationInfo)

		serviceAccountDelegationInfo := authenticationInfo.ServiceAccountDelegationInfo
		assert.Equal(t, "02aef516-317f-4ec1-a1df-1acbd4d49fe3", serviceAccountDelegationInfo[0].GetIdpPrincipal().PrincipalId)
		assert.Equal(t, "do-not-reply@stackit.cloud", serviceAccountDelegationInfo[0].GetIdpPrincipal().PrincipalEmail)
	})

	t.Run("impersonated token of impersonated access token", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Authorization"] = []string{serviceAccountTokenRepeatedlyImpersonated}
		request := ApiRequest{Header: headers}

		auditClaims, authenticationPrincipal, audiences, authenticationInfo, err :=
			AuditAttributesFromAuthorizationHeader(&request)

		auditClaimsMap := auditClaims.AsMap()
		assert.Nil(t, err)
		assert.Equal(t, "stackit/serviceaccount", auditClaimsMap["iss"])
		assert.Equal(t, "1734b4b6-1d5e-4819-9b50-29917a1b9ad5", auditClaimsMap["sub"])
		assert.Equal(t, []interface{}{"stackit", "api"}, auditClaimsMap["aud"].([]interface{}))
		assert.Equal(t, "1f7f1efc-3349-411a-a5d7-2255e0a5a8ae", auditClaimsMap["jti"])

		principal := fmt.Sprintf("%s/%s",
			url.QueryEscape("1734b4b6-1d5e-4819-9b50-29917a1b9ad5"),
			url.QueryEscape("stackit/serviceaccount"))
		assert.Equal(t, principal, authenticationPrincipal)

		assert.Equal(t, []string{"stackit", "api"}, audiences)

		assert.Equal(t, "1734b4b6-1d5e-4819-9b50-29917a1b9ad5", authenticationInfo.PrincipalId)
		assert.Equal(t, "service-account-3-fghsxw1@sa.stackit.cloud", authenticationInfo.PrincipalEmail)

		assert.Equal(t,
			"projects/dacc7830-843e-4c5e-86ff-aa0fb51d636f/service-accounts/1734b4b6-1d5e-4819-9b50-29917a1b9ad5",
			*authenticationInfo.ServiceAccountName)
		assert.NotNil(t, authenticationInfo.ServiceAccountDelegationInfo)

		serviceAccountDelegationInfo := authenticationInfo.ServiceAccountDelegationInfo
		assert.Equal(t, "f45009b2-6433-43c1-b6c7-618c44359e71", serviceAccountDelegationInfo[0].GetIdpPrincipal().PrincipalId)
		assert.Equal(t, "do-not-reply@stackit.cloud", serviceAccountDelegationInfo[0].GetIdpPrincipal().PrincipalEmail)
		assert.Equal(t, "02aef516-317f-4ec1-a1df-1acbd4d49fe3", serviceAccountDelegationInfo[1].GetIdpPrincipal().PrincipalId)
		assert.Equal(t, "do-not-reply@stackit.cloud", serviceAccountDelegationInfo[1].GetIdpPrincipal().PrincipalEmail)
	})

	t.Run("user token", func(t *testing.T) {
		headers := make(map[string][]string)
		headers["Authorization"] = []string{userToken}
		request := ApiRequest{Header: headers}

		auditClaims, authenticationPrincipal, audiences, authenticationInfo, err :=
			AuditAttributesFromAuthorizationHeader(&request)

		auditClaimsMap := auditClaims.AsMap()
		assert.Nil(t, err)
		assert.Equal(t, "https://accounts.dev.stackit.cloud", auditClaimsMap["iss"])
		assert.Equal(t, "cd94f01a-df2e-4456-902e-48f5e57f0b63", auditClaimsMap["sub"])
		assert.Equal(t, []interface{}{"stackit-portal-login-dev-client-id"}, auditClaimsMap["aud"].([]interface{}))
		assert.Equal(t, "d73a67ac-d1ec-4b55-99d4-e953275f022a", auditClaimsMap["jti"])

		principal := fmt.Sprintf("%s/%s",
			url.QueryEscape("cd94f01a-df2e-4456-902e-48f5e57f0b63"),
			url.QueryEscape("https://accounts.dev.stackit.cloud"))
		assert.Equal(t, principal, authenticationPrincipal)

		assert.Equal(t, []string{"stackit-portal-login-dev-client-id"}, audiences)

		assert.Equal(t, "cd94f01a-df2e-4456-902e-48f5e57f0b63", authenticationInfo.PrincipalId)
		assert.Equal(t, "Christian.Schaible@novatec-gmbh.de", authenticationInfo.PrincipalEmail)

		assert.Nil(t, authenticationInfo.ServiceAccountName)
		assert.Nil(t, authenticationInfo.ServiceAccountDelegationInfo)
	})
}

func Test_NewAuditLogEntry(t *testing.T) {

	t.Run("minimum attributes set", func(t *testing.T) {
		userAgent := "userAgent"
		requestHeaders := make(map[string][]string)
		requestHeaders["Authorization"] = []string{userToken}
		requestHeaders["User-Agent"] = []string{userAgent}
		requestHeaders["Custom"] = []string{"customHeader"}

		request := ApiRequest{
			Method: "GET",
			URL:    RequestUrl{Path: "/audit/new"},
			Host:   "localhost:8080",
			Proto:  "HTTP/1.1",
			Scheme: "http",
			Header: requestHeaders,
		}

		clientIp := "127.0.0.1"
		correlationId := uuid.NewString()
		auditRequest := AuditRequest{
			Request:              &request,
			RequestClientIP:      clientIp,
			RequestCorrelationId: &correlationId,
			RequestId:            nil,
			RequestTime:          nil,
		}

		statusCode := 200
		auditResponse := AuditResponse{
			ResponseBodyBytes:  nil,
			ResponseStatusCode: statusCode,
			ResponseHeaders:    nil,
			ResponseNumItems:   nil,
			ResponseTime:       nil,
		}

		objectId := uuid.NewString()
		logName := fmt.Sprintf("projects/%s/logs/%s", objectId, EventTypeAdminActivity)
		serviceName := "resource-manager"
		operationName := fmt.Sprintf("stackit.%s.v2.projects.updated", serviceName)
		resourceName := fmt.Sprintf("projects/%s", objectId)
		auditTime := time.Now().UTC()
		insertId := fmt.Sprintf("%d/%s/%s/%d", auditTime.UnixNano(), "eu01", "1", 1)

		severity := auditV1.LogSeverity_LOG_SEVERITY_DEFAULT
		auditMetadata := AuditMetadata{
			AuditInsertId:          insertId,
			AuditLabels:            nil,
			AuditLogName:           logName,
			AuditLogSeverity:       severity,
			AuditOperationName:     operationName,
			AuditPermission:        nil,
			AuditPermissionGranted: nil,
			AuditResourceName:      resourceName,
			AuditServiceName:       serviceName,
			AuditTime:              nil,
		}

		logEntry, _ := NewAuditLogEntry(
			auditRequest,
			auditResponse,
			nil,
			auditMetadata)

		assert.Equal(t, logName, logEntry.LogName)
		assert.Equal(t, insertId, logEntry.InsertId)
		assert.Equal(t, &correlationId, logEntry.CorrelationId)
		assert.Equal(t, severity, logEntry.Severity)
		assert.NoError(t, logEntry.Timestamp.CheckValid())
		assert.Nil(t, logEntry.Labels)

		payload := logEntry.ProtoPayload
		assert.NotNil(t, payload)
		assert.Equal(t, serviceName, payload.ServiceName)
		assert.Equal(t, operationName, payload.OperationName)
		assert.Equal(t, resourceName, payload.ResourceName)
		assert.Equal(t, int32(statusCode), payload.ResponseMetadata.StatusCode.Value)
		assert.Nil(t, payload.ResponseMetadata.ErrorMessage)
		assert.Nil(t, payload.ResponseMetadata.ErrorDetails)
		assert.Nil(t, payload.ResponseMetadata.ResponseAttributes.Size)
		assert.NotNil(t, payload.ResponseMetadata.ResponseAttributes.Time)
		assert.Nil(t, payload.ResponseMetadata.ResponseAttributes.NumResponseItems)
		assert.Nil(t, payload.ResponseMetadata.ResponseAttributes.Headers)

		assert.Nil(t, payload.Request)
		assert.Nil(t, payload.Response)
		assert.Nil(t, payload.Metadata)

		authenticationInfo := payload.AuthenticationInfo
		assert.NotNil(t, authenticationInfo)
		assert.Equal(t, "cd94f01a-df2e-4456-902e-48f5e57f0b63", authenticationInfo.PrincipalId)
		assert.Equal(t, "Christian.Schaible@novatec-gmbh.de", authenticationInfo.PrincipalEmail)
		assert.Nil(t, authenticationInfo.ServiceAccountName)
		assert.Nil(t, authenticationInfo.ServiceAccountDelegationInfo)

		assert.Nil(t, payload.AuthorizationInfo)

		requestMetadata := payload.RequestMetadata
		assert.NotNil(t, requestMetadata)
		assert.Equal(t, clientIp, requestMetadata.CallerIp)
		assert.Equal(t, userAgent, requestMetadata.CallerSuppliedUserAgent)

		// Don't verify explicitly - trust on other unit test
		assert.NotNil(t, userAgent, requestMetadata.RequestAttributes)
	})

	t.Run("all attributes set", func(t *testing.T) {
		userAgent := "userAgent"
		requestHeaders := make(map[string][]string)
		requestHeaders["Authorization"] = []string{userToken}
		requestHeaders["User-Agent"] = []string{userAgent}
		requestHeaders["Custom"] = []string{"customHeader"}

		requestBody := make(map[string]interface{})
		requestBody["key"] = "request"
		requestBodyBytes, _ := json.Marshal(requestBody)
		query := "topic=project"
		request := ApiRequest{
			Method: "GET",
			URL:    RequestUrl{Path: "/audit/new", RawQuery: &query},
			Host:   "localhost:8080",
			Proto:  "HTTP/1.1",
			Scheme: "http",
			Header: requestHeaders,
			Body:   &requestBodyBytes,
		}

		clientIp := "127.0.0.1"
		correlationId := uuid.NewString()
		requestId := uuid.NewString()
		requestTime := time.Now().UTC()
		auditRequest := AuditRequest{
			Request:              &request,
			RequestClientIP:      clientIp,
			RequestCorrelationId: &correlationId,
			RequestId:            &requestId,
			RequestTime:          &requestTime,
		}

		response := make(map[string]interface{})
		response["key"] = "value"
		responseBody, _ := json.Marshal(response)
		responseHeader := http.Header{}
		responseHeader.Set("Content-Type", "application/json")
		responseHeaderMap := make(map[string]string)
		responseHeaderMap["Content-Type"] = "application/json"
		responseNumItems := int64(1)
		responseStatusCode := 400
		responseTime := time.Now().UTC()

		auditResponse := AuditResponse{
			ResponseBodyBytes:  &responseBody,
			ResponseStatusCode: responseStatusCode,
			ResponseHeaders:    responseHeader,
			ResponseNumItems:   &responseNumItems,
			ResponseTime:       &responseTime,
		}

		auditTime := time.Now().UTC()

		objectId := uuid.NewString()
		logName := fmt.Sprintf("projects/%s/logs/%s", objectId, EventTypeAdminActivity)
		serviceName := "resource-manager"
		operationName := fmt.Sprintf("stackit.%s.v2.projects.updated", serviceName)
		resourceName := fmt.Sprintf("projects/%s", objectId)
		insertId := fmt.Sprintf("%d/%s/%s/%d", auditTime.UnixNano(), "eu01", "1", 1)
		permission := "resource-manager.project.edit"
		permissionGranted := true
		labels := make(map[string]string)
		labels["label"] = "value"

		severity := auditV1.LogSeverity_LOG_SEVERITY_DEFAULT

		auditMetadata := AuditMetadata{
			AuditInsertId:          insertId,
			AuditLabels:            &labels,
			AuditLogName:           logName,
			AuditLogSeverity:       severity,
			AuditOperationName:     operationName,
			AuditPermission:        &permission,
			AuditPermissionGranted: &permissionGranted,
			AuditResourceName:      resourceName,
			AuditServiceName:       serviceName,
			AuditTime:              &auditTime,
		}

		eventMetadata := map[string]interface{}{"key": "value"}
		logEntry, _ := NewAuditLogEntry(
			auditRequest,
			auditResponse,
			&eventMetadata,
			auditMetadata)

		assert.Equal(t, logName, logEntry.LogName)
		assert.Equal(t, insertId, logEntry.InsertId)
		assert.Equal(t, labels, logEntry.Labels)
		assert.Equal(t, correlationId, *logEntry.CorrelationId)
		assert.Equal(t, timestamppb.New(auditTime), logEntry.Timestamp)
		assert.Equal(t, severity, logEntry.Severity)
		assert.NotNil(t, logEntry.ProtoPayload)

		payload := logEntry.ProtoPayload
		assert.NotNil(t, payload)
		assert.Equal(t, serviceName, payload.ServiceName)
		assert.Equal(t, operationName, payload.OperationName)
		assert.Equal(t, resourceName, payload.ResourceName)
		assert.Equal(t, int32(responseStatusCode), payload.ResponseMetadata.StatusCode.Value)
		assert.Equal(t, "Client error", *payload.ResponseMetadata.ErrorMessage)
		assert.Nil(t, payload.ResponseMetadata.ErrorDetails)
		assert.Equal(t, wrapperspb.Int64(int64(len(responseBody))), payload.ResponseMetadata.ResponseAttributes.Size)
		assert.Equal(t, timestamppb.New(responseTime), payload.ResponseMetadata.ResponseAttributes.Time)
		assert.Equal(t, wrapperspb.Int64(responseNumItems), payload.ResponseMetadata.ResponseAttributes.NumResponseItems)
		assert.Equal(t, responseHeaderMap, payload.ResponseMetadata.ResponseAttributes.Headers)

		expectedRequestBody, _ := structpb.NewStruct(requestBody)
		assert.Equal(t, expectedRequestBody, payload.Request)
		expectedResponseBody, _ := structpb.NewStruct(response)
		assert.Equal(t, expectedResponseBody, payload.Response)
		expectedEventMetadata, _ := structpb.NewStruct(eventMetadata)
		assert.Equal(t, expectedEventMetadata, payload.Metadata)

		authenticationInfo := payload.AuthenticationInfo
		assert.NotNil(t, authenticationInfo)
		assert.Equal(t, "cd94f01a-df2e-4456-902e-48f5e57f0b63", authenticationInfo.PrincipalId)
		assert.Equal(t, "Christian.Schaible@novatec-gmbh.de", authenticationInfo.PrincipalEmail)
		assert.Nil(t, authenticationInfo.ServiceAccountName)
		assert.Nil(t, authenticationInfo.ServiceAccountDelegationInfo)

		authorizationInfo := payload.AuthorizationInfo
		assert.NotNil(t, authorizationInfo)
		assert.Equal(t, 1, len(authorizationInfo))
		assert.Equal(t, permission, *authorizationInfo[0].Permission)
		assert.Equal(t, permissionGranted, *authorizationInfo[0].Granted)
		assert.Equal(t, resourceName, authorizationInfo[0].Resource)

		requestMetadata := payload.RequestMetadata
		assert.NotNil(t, requestMetadata)
		assert.Equal(t, clientIp, requestMetadata.CallerIp)
		assert.Equal(t, userAgent, requestMetadata.CallerSuppliedUserAgent)

		// Don't verify explicitly - trust on other unit test
		assert.NotNil(t, userAgent, requestMetadata.RequestAttributes)
	})
}

func Test_NewInsertId(t *testing.T) {
	insertTime := time.Now().UTC()
	location := "eu01"
	workerId := uuid.NewString()
	var eventSequenceNumber uint64 = 1

	insertId := NewInsertId(insertTime, location, workerId, eventSequenceNumber)
	expectedId := fmt.Sprintf("%d/%s/%s/%d", insertTime.UnixNano(), location, workerId, eventSequenceNumber)
	assert.Equal(t, expectedId, insertId)
}

func Test_NewNewAuditRoutingIdentifier(t *testing.T) {
	objectId := uuid.NewString()
	objectType := ObjectTypeProject

	routingIdentifier := NewAuditRoutingIdentifier(objectId, objectType)
	assert.Equal(t, objectId, routingIdentifier.Identifier)
	assert.Equal(t, objectType, routingIdentifier.Type)
}

func Test_OperationNameFromUrlPath(t *testing.T) {

	t.Run("empty path", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("", "GET")
		assert.Equal(t, "", operationName)
	})

	t.Run("root path", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/", "GET")
		assert.Equal(t, "", operationName)
	})

	t.Run("path without version", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "GET")
		assert.Equal(t, "projects.read", operationName)
	})

	t.Run("path with uuid without version", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects/ac51bbd2-cb23-441b-a2ee-5393189695aa", "GET")
		assert.Equal(t, "projects.read", operationName)
	})

	t.Run("path with uuid and version", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/v2/projects/ac51bbd2-cb23-441b-a2ee-5393189695aa", "GET")
		assert.Equal(t, "v2.projects.read", operationName)
	})

	t.Run("concatenated path", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/v2/organizations/ac51bbd2-cb23-441b-a2ee-5393189695aa/folders/167fc176-9d8e-477b-a56c-b50d7b26adcf/projects/0a2a4f9b-4e67-4562-ad02-c2d200e05aa6/audit/policy", "GET")
		assert.Equal(t, "v2.organizations.folders.projects.audit.policy.read", operationName)
	})

	t.Run("path with query params", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/v2/organizations/ac51bbd2-cb23-441b-a2ee-5393189695aa/audit/policy?since=2024-08-27", "GET")
		assert.Equal(t, "v2.organizations.audit.policy.read", operationName)
	})

	t.Run("path trailing slash", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects/ac51bbd2-cb23-441b-a2ee-5393189695aa/", "GET")
		assert.Equal(t, "projects.read", operationName)
	})

	t.Run("path trailing slash and query params", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects/ac51bbd2-cb23-441b-a2ee-5393189695aa/?changeDate=2024-10-13", "GET")
		assert.Equal(t, "projects.read", operationName)
	})

	t.Run("http method post", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "POST")
		assert.Equal(t, "projects.create", operationName)
	})

	t.Run("http method put", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "PUT")
		assert.Equal(t, "projects.update", operationName)
	})

	t.Run("http method patch", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "PATCH")
		assert.Equal(t, "projects.update", operationName)
	})

	t.Run("http method delete", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "DELETE")
		assert.Equal(t, "projects.delete", operationName)
	})

	t.Run("operation name fallback on options", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "OPTIONS")
		assert.Equal(t, "projects.read", operationName)
	})

	t.Run("operation name fallback on unknown", func(t *testing.T) {
		operationName := OperationNameFromUrlPath("/projects", "UNKNOWN")
		assert.Equal(t, "projects.read", operationName)
	})
}

func Test_OperationNameFromGrpcMethod(t *testing.T) {

	t.Run("empty path", func(t *testing.T) {
		operationName := OperationNameFromGrpcMethod("")
		assert.Equal(t, "", operationName)
	})

	t.Run("root path", func(t *testing.T) {
		operationName := OperationNameFromGrpcMethod("/")
		assert.Equal(t, "", operationName)
	})

	t.Run("path without version", func(t *testing.T) {
		operationName := OperationNameFromGrpcMethod("/example.ExampleService/ManualAuditEvent")
		assert.Equal(t, "example.exampleservice.manualauditevent", operationName)
	})

	t.Run("path with version", func(t *testing.T) {
		operationName := OperationNameFromGrpcMethod("/example.v1.ExampleService/ManualAuditEvent")
		assert.Equal(t, "example.v1.exampleservice.manualauditevent", operationName)
	})

	t.Run("path trailing slash", func(t *testing.T) {
		operationName := OperationNameFromGrpcMethod("/example.v1.ExampleService/ManualAuditEvent/")
		assert.Equal(t, "example.v1.exampleservice.manualauditevent", operationName)
	})
}

func Test_GetObjectIdAndTypeFromUrlPath(t *testing.T) {

	t.Run("object id and type not in url", func(t *testing.T) {
		objectId, objectType, err := GetObjectIdAndTypeFromUrlPath("/v2/projects/audit")
		assert.NoError(t, err)
		assert.Equal(t, "", objectId)
		assert.Nil(t, objectType)
	})

	t.Run("object id and type in url", func(t *testing.T) {
		objectId, objectType, err := GetObjectIdAndTypeFromUrlPath("/v2/projects/f17d4064-9b65-4334-b6a7-8fed96340124")
		assert.NoError(t, err)
		assert.Equal(t, "f17d4064-9b65-4334-b6a7-8fed96340124", objectId)
		assert.Equal(t, ObjectTypeProject, *objectType)
	})

	t.Run("multiple object ids and types in url", func(t *testing.T) {
		objectId, objectType, err := GetObjectIdAndTypeFromUrlPath("/v2/organization/8ee58bec-d496-4bb9-af8d-72fda4d78b6b/projects/f17d4064-9b65-4334-b6a7-8fed96340124")
		assert.NoError(t, err)
		assert.Equal(t, "f17d4064-9b65-4334-b6a7-8fed96340124", objectId)
		assert.Equal(t, ObjectTypeProject, *objectType)
	})
}

func Test_ToArrayMap(t *testing.T) {

	t.Run("empty map", func(t *testing.T) {
		result := ToArrayMap(map[string]string{})
		assert.Equal(t, map[string][]string{}, result)
	})

	t.Run("empty map", func(t *testing.T) {
		result := ToArrayMap(map[string]string{"key1": "value1", "key2": "value2"})
		assert.Equal(t, map[string][]string{
			"key1": {"value1"},
			"key2": {"value2"},
		}, result)
	})
}

func Test_StringAttributeFromMetadata(t *testing.T) {

	metadata := map[string][]string{"key1": {"value1"}, "key2": {"value2"}}

	t.Run("not found", func(t *testing.T) {
		attribute := StringAttributeFromMetadata(metadata, "key3")
		assert.Equal(t, "", attribute)
	})

	t.Run("found", func(t *testing.T) {
		attribute := StringAttributeFromMetadata(metadata, "key2")
		assert.Equal(t, "value2", attribute)
	})
}

func Test_ResponseBodyToBytes(t *testing.T) {

	t.Run(
		"nil response body", func(t *testing.T) {
			bytes, err := ResponseBodyToBytes(nil)
			assert.Nil(t, bytes)
			assert.Nil(t, err)
		},
	)

	t.Run(
		"bytes", func(t *testing.T) {
			responseBody := []byte("data")
			bytes, err := ResponseBodyToBytes(responseBody)
			assert.Nil(t, err)
			assert.Equal(t, &responseBody, bytes)
		},
	)

	t.Run(
		"Protobuf message", func(t *testing.T) {
			protobufMessage := auditV1.ObjectIdentifier{Identifier: uuid.NewString(), Type: string(ObjectTypeProject)}
			bytes, err := ResponseBodyToBytes(&protobufMessage)
			assert.Nil(t, err)

			expected, err := protojson.Marshal(&protobufMessage)
			assert.Nil(t, err)
			assert.Equal(t, &expected, bytes)
		},
	)

	t.Run(
		"struct", func(t *testing.T) {
			type CustomObject struct {
				Value string
			}

			responseBody := CustomObject{Value: "data"}
			bytes, err := ResponseBodyToBytes(responseBody)
			assert.Nil(t, err)

			expected, err := json.Marshal(responseBody)
			assert.Nil(t, err)
			assert.Equal(t, &expected, bytes)
		},
	)

	t.Run(
		"map", func(t *testing.T) {

			responseBody := map[string]interface{}{"value": "data"}
			bytes, err := ResponseBodyToBytes(responseBody)
			assert.Nil(t, err)

			expected, err := json.Marshal(responseBody)
			assert.Nil(t, err)
			assert.Equal(t, &expected, bytes)
		},
	)
}