package endpointutils

import (
	"fmt"
	"strings"
	"time"

	portainer "github.com/portainer/portainer/api"
	"github.com/portainer/portainer/api/dataservices"
	"github.com/portainer/portainer/api/kubernetes/cli"
	log "github.com/rs/zerolog/log"
)

// IsLocalEndpoint returns true if this is a local environment(endpoint)
func IsLocalEndpoint(endpoint *portainer.Endpoint) bool {
	return strings.HasPrefix(endpoint.URL, "unix://") || strings.HasPrefix(endpoint.URL, "npipe://") || endpoint.Type == 5
}

// IsKubernetesEndpoint returns true if this is a kubernetes environment(endpoint)
func IsKubernetesEndpoint(endpoint *portainer.Endpoint) bool {
	return endpoint.Type == portainer.KubernetesLocalEnvironment ||
		endpoint.Type == portainer.AgentOnKubernetesEnvironment ||
		endpoint.Type == portainer.EdgeAgentOnKubernetesEnvironment
}

// IsDockerEndpoint returns true if this is a docker environment(endpoint)
func IsDockerEndpoint(endpoint *portainer.Endpoint) bool {
	return endpoint.Type == portainer.DockerEnvironment ||
		endpoint.Type == portainer.AgentOnDockerEnvironment ||
		endpoint.Type == portainer.EdgeAgentOnDockerEnvironment
}

// IsEdgeEndpoint returns true if this is an Edge endpoint
func IsEdgeEndpoint(endpoint *portainer.Endpoint) bool {
	return endpoint.Type == portainer.EdgeAgentOnDockerEnvironment || endpoint.Type == portainer.EdgeAgentOnKubernetesEnvironment
}

// IsAgentEndpoint returns true if this is an Agent endpoint
func IsAgentEndpoint(endpoint *portainer.Endpoint) bool {
	return endpoint.Type == portainer.AgentOnDockerEnvironment ||
		endpoint.Type == portainer.EdgeAgentOnDockerEnvironment ||
		endpoint.Type == portainer.AgentOnKubernetesEnvironment ||
		endpoint.Type == portainer.EdgeAgentOnKubernetesEnvironment
}

// FilterByExcludeIDs receives an environment(endpoint) array and returns a filtered array using an excludeIds param
func FilterByExcludeIDs(endpoints []portainer.Endpoint, excludeIds []portainer.EndpointID) []portainer.Endpoint {
	if len(excludeIds) == 0 {
		return endpoints
	}

	filteredEndpoints := make([]portainer.Endpoint, 0)

	idsSet := make(map[portainer.EndpointID]bool)
	for _, id := range excludeIds {
		idsSet[id] = true
	}

	for _, endpoint := range endpoints {
		if !idsSet[endpoint.ID] {
			filteredEndpoints = append(filteredEndpoints, endpoint)
		}
	}
	return filteredEndpoints
}

// EndpointSet receives an environment(endpoint) array and returns a set
func EndpointSet(endpointIDs []portainer.EndpointID) map[portainer.EndpointID]bool {
	set := map[portainer.EndpointID]bool{}

	for _, endpointID := range endpointIDs {
		set[endpointID] = true
	}

	return set
}

func InitialIngressClassDetection(endpoint *portainer.Endpoint, endpointService dataservices.EndpointService, factory *cli.ClientFactory) {
	if endpoint.Kubernetes.Flags.IsServerIngressClassDetected {
		return
	}
	defer func() {
		endpoint.Kubernetes.Flags.IsServerIngressClassDetected = true
		endpointService.UpdateEndpoint(
			portainer.EndpointID(endpoint.ID),
			endpoint,
		)
	}()
	cli, err := factory.GetKubeClient(endpoint)
	if err != nil {
		log.Debug().Err(err).Msg("unable to create kubernetes client for ingress class detection")
		return
	}
	controllers, err := cli.GetIngressControllers()
	if err != nil {
		log.Debug().Err(err).Msg("failed to fetch ingressclasses")
		return
	}

	var updatedClasses []portainer.KubernetesIngressClassConfig
	for i := range controllers {
		var updatedClass portainer.KubernetesIngressClassConfig
		updatedClass.Name = controllers[i].ClassName
		updatedClass.Type = controllers[i].Type
		updatedClasses = append(updatedClasses, updatedClass)
	}

	endpoint.Kubernetes.Configuration.IngressClasses = updatedClasses
	err = endpointService.UpdateEndpoint(
		portainer.EndpointID(endpoint.ID),
		endpoint,
	)
	if err != nil {
		log.Debug().Err(err).Msg("unable to store found IngressClasses inside the database")
		return
	}
}

func InitialMetricsDetection(endpoint *portainer.Endpoint, endpointService dataservices.EndpointService, factory *cli.ClientFactory) {
	if endpoint.Kubernetes.Flags.IsServerMetricsDetected {
		return
	}
	defer func() {
		endpoint.Kubernetes.Flags.IsServerMetricsDetected = true
		endpointService.UpdateEndpoint(
			portainer.EndpointID(endpoint.ID),
			endpoint,
		)
	}()
	cli, err := factory.GetKubeClient(endpoint)
	if err != nil {
		log.Debug().Err(err).Msg("unable to create kubernetes client for initial metrics detection")
		return
	}
	_, err = cli.GetMetrics()
	if err != nil {
		log.Debug().Err(err).Msg("unable to fetch metrics: leaving metrics collection disabled.")
		return
	}
	endpoint.Kubernetes.Configuration.UseServerMetrics = true
	if err != nil {
		log.Debug().Err(err).Msg("unable to enable UseServerMetrics inside the database")
		return
	}
}

func storageDetect(endpoint *portainer.Endpoint, endpointService dataservices.EndpointService, factory *cli.ClientFactory) error {
	cli, err := factory.GetKubeClient(endpoint)
	if err != nil {
		log.Debug().Err(err).Msg("unable to create Kubernetes client for initial storage detection")
		return err
	}

	storage, err := cli.GetStorage()
	if err != nil {
		log.Debug().Err(err).Msg("unable to fetch storage classes: leaving storage classes disabled")
		return err
	}
	if len(storage) == 0 {
		log.Info().Err(err).Msg("zero storage classes found: they may be still building, retrying in 30 seconds")
		return fmt.Errorf("zero storage classes found: they may be still building, retrying in 30 seconds")
	}
	endpoint.Kubernetes.Configuration.StorageClasses = storage
	err = endpointService.UpdateEndpoint(
		portainer.EndpointID(endpoint.ID),
		endpoint,
	)
	if err != nil {
		log.Debug().Err(err).Msg("unable to enable storage class inside the database")
		return err
	}
	return nil
}

func InitialStorageDetection(endpoint *portainer.Endpoint, endpointService dataservices.EndpointService, factory *cli.ClientFactory) {
	if endpoint.Kubernetes.Flags.IsServerStorageDetected {
		return
	}
	defer func() {
		endpoint.Kubernetes.Flags.IsServerStorageDetected = true
		endpointService.UpdateEndpoint(
			portainer.EndpointID(endpoint.ID),
			endpoint,
		)
	}()
	log.Info().Msg("attempting to detect storage classes in the cluster")
	err := storageDetect(endpoint, endpointService, factory)
	if err == nil {
		return
	}
	log.Err(err).Msg("error while detecting storage classes")
	go func() {
		// Retry after 30 seconds if the initial detection failed.
		log.Info().Msg("retrying storage detection in 30 seconds")
		time.Sleep(30 * time.Second)
		err := storageDetect(endpoint, endpointService, factory)
		log.Err(err).Msg("final error while detecting storage classes")
	}()
}

func UpdateEdgeEndpointHeartbeat(endpoint *portainer.Endpoint, settings *portainer.Settings) {
	if IsEdgeEndpoint(endpoint) {
		checkInInterval := getEndpointCheckinInterval(endpoint, settings)
		endpoint.Heartbeat = endpoint.QueryDate-endpoint.LastCheckInDate <= int64(checkInInterval*2+20)
	}
}

func getEndpointCheckinInterval(endpoint *portainer.Endpoint, settings *portainer.Settings) int {
	if endpoint.Edge.AsyncMode {
		defaultInterval := 60
		intervals := [][]int{
			{endpoint.Edge.PingInterval, settings.Edge.PingInterval},
			{endpoint.Edge.CommandInterval, settings.Edge.CommandInterval},
			{endpoint.Edge.SnapshotInterval, settings.Edge.SnapshotInterval},
		}

		for i := 0; i < len(intervals); i++ {
			effectiveInterval := intervals[i][0]
			if effectiveInterval <= 0 {
				effectiveInterval = intervals[i][1]
			}
			if effectiveInterval > 0 && effectiveInterval < defaultInterval {
				defaultInterval = effectiveInterval
			}
		}

		return defaultInterval
	}

	if endpoint.EdgeCheckinInterval > 0 {
		return endpoint.EdgeCheckinInterval
	}

	return settings.EdgeAgentCheckinInterval
}