package shared

import (
	"strconv"
	"strings"

	"github.com/containers/libpod/libpod"
	"github.com/containers/libpod/libpod/define"
	"github.com/containers/libpod/pkg/util"
	"github.com/cri-o/ocicni/pkg/ocicni"
	"github.com/docker/go-connections/nat"
	"github.com/pkg/errors"
)

// TODO GetPodStatus and CreatePodStatusResults should removed once the adapter
// and shared packages are reworked.  It has now been duplicated in libpod proper.

// GetPodStatus determines the status of the pod based on the
// statuses of the containers in the pod.
// Returns a string representation of the pod status
func GetPodStatus(pod *libpod.Pod) (string, error) {
	ctrStatuses, err := pod.Status()
	if err != nil {
		return define.PodStateErrored, err
	}
	return CreatePodStatusResults(ctrStatuses)
}

func CreatePodStatusResults(ctrStatuses map[string]define.ContainerStatus) (string, error) {
	ctrNum := len(ctrStatuses)
	if ctrNum == 0 {
		return define.PodStateCreated, nil
	}
	statuses := map[string]int{
		define.PodStateStopped: 0,
		define.PodStateRunning: 0,
		define.PodStatePaused:  0,
		define.PodStateCreated: 0,
		define.PodStateErrored: 0,
	}
	for _, ctrStatus := range ctrStatuses {
		switch ctrStatus {
		case define.ContainerStateExited:
			fallthrough
		case define.ContainerStateStopped:
			statuses[define.PodStateStopped]++
		case define.ContainerStateRunning:
			statuses[define.PodStateRunning]++
		case define.ContainerStatePaused:
			statuses[define.PodStatePaused]++
		case define.ContainerStateCreated, define.ContainerStateConfigured:
			statuses[define.PodStateCreated]++
		default:
			statuses[define.PodStateErrored]++
		}
	}

	switch {
	case statuses[define.PodStateRunning] > 0:
		return define.PodStateRunning, nil
	case statuses[define.PodStatePaused] == ctrNum:
		return define.PodStatePaused, nil
	case statuses[define.PodStateStopped] == ctrNum:
		return define.PodStateExited, nil
	case statuses[define.PodStateStopped] > 0:
		return define.PodStateStopped, nil
	case statuses[define.PodStateErrored] > 0:
		return define.PodStateErrored, nil
	default:
		return define.PodStateCreated, nil
	}
}

// GetNamespaceOptions transforms a slice of kernel namespaces
// into a slice of pod create options. Currently, not all
// kernel namespaces are supported, and they will be returned in an error
func GetNamespaceOptions(ns []string) ([]libpod.PodCreateOption, error) {
	var options []libpod.PodCreateOption
	var erroredOptions []libpod.PodCreateOption
	for _, toShare := range ns {
		switch toShare {
		case "cgroup":
			options = append(options, libpod.WithPodCgroups())
		case "net":
			options = append(options, libpod.WithPodNet())
		case "mnt":
			return erroredOptions, errors.Errorf("Mount sharing functionality not supported on pod level")
		case "pid":
			options = append(options, libpod.WithPodPID())
		case "user":
			return erroredOptions, errors.Errorf("User sharing functionality not supported on pod level")
		case "ipc":
			options = append(options, libpod.WithPodIPC())
		case "uts":
			options = append(options, libpod.WithPodUTS())
		case "":
		case "none":
			return erroredOptions, nil
		default:
			return erroredOptions, errors.Errorf("Invalid kernel namespace to share: %s. Options are: net, pid, ipc, uts or none", toShare)
		}
	}
	return options, nil
}

// CreatePortBindings iterates ports mappings and exposed ports into a format CNI understands
func CreatePortBindings(ports []string) ([]ocicni.PortMapping, error) {
	var portBindings []ocicni.PortMapping
	// The conversion from []string to natBindings is temporary while mheon reworks the port
	// deduplication code.  Eventually that step will not be required.
	_, natBindings, err := nat.ParsePortSpecs(ports)
	if err != nil {
		return nil, err
	}
	for containerPb, hostPb := range natBindings {
		var pm ocicni.PortMapping
		pm.ContainerPort = int32(containerPb.Int())
		for _, i := range hostPb {
			var hostPort int
			var err error
			pm.HostIP = i.HostIP
			if i.HostPort == "" {
				hostPort = containerPb.Int()
			} else {
				hostPort, err = strconv.Atoi(i.HostPort)
				if err != nil {
					return nil, errors.Wrapf(err, "unable to convert host port to integer")
				}
			}

			pm.HostPort = int32(hostPort)
			pm.Protocol = containerPb.Proto()
			portBindings = append(portBindings, pm)
		}
	}
	return portBindings, nil
}

// GetPodsWithFilters uses the cliconfig to categorize if the latest pod is required.
func GetPodsWithFilters(r *libpod.Runtime, filters string) ([]*libpod.Pod, error) {
	filterFuncs, err := GenerateFilterFunction(r, strings.Split(filters, ","))
	if err != nil {
		return nil, err
	}
	return FilterAllPodsWithFilterFunc(r, filterFuncs...)
}

// FilterAllPodsWithFilterFunc retrieves all pods
// Filters can be provided which will determine which pods are included in the
// output. Multiple filters are handled by ANDing their output, so only pods
// matching all filters are returned
func FilterAllPodsWithFilterFunc(r *libpod.Runtime, filters ...libpod.PodFilter) ([]*libpod.Pod, error) {
	pods, err := r.Pods(filters...)
	if err != nil {
		return nil, err
	}
	return pods, nil
}

// GenerateFilterFunction basically gets the filters based on the input by the user
// and filter the pod list based on the criteria.
func GenerateFilterFunction(r *libpod.Runtime, filters []string) ([]libpod.PodFilter, error) {
	var filterFuncs []libpod.PodFilter
	for _, f := range filters {
		filterSplit := strings.SplitN(f, "=", 2)
		if len(filterSplit) < 2 {
			return nil, errors.Errorf("filter input must be in the form of filter=value: %s is invalid", f)
		}
		generatedFunc, err := generatePodFilterFuncs(filterSplit[0], filterSplit[1])
		if err != nil {
			return nil, errors.Wrapf(err, "invalid filter")
		}
		filterFuncs = append(filterFuncs, generatedFunc)
	}

	return filterFuncs, nil
}
func generatePodFilterFuncs(filter, filterValue string) (
	func(pod *libpod.Pod) bool, error) {
	switch filter {
	case "ctr-ids":
		return func(p *libpod.Pod) bool {
			ctrIds, err := p.AllContainersByID()
			if err != nil {
				return false
			}
			return util.StringInSlice(filterValue, ctrIds)
		}, nil
	case "ctr-names":
		return func(p *libpod.Pod) bool {
			ctrs, err := p.AllContainers()
			if err != nil {
				return false
			}
			for _, ctr := range ctrs {
				if filterValue == ctr.Name() {
					return true
				}
			}
			return false
		}, nil
	case "ctr-number":
		return func(p *libpod.Pod) bool {
			ctrIds, err := p.AllContainersByID()
			if err != nil {
				return false
			}

			fVint, err2 := strconv.Atoi(filterValue)
			if err2 != nil {
				return false
			}
			return len(ctrIds) == fVint
		}, nil
	case "ctr-status":
		if !util.StringInSlice(filterValue,
			[]string{"created", "restarting", "running", "paused",
				"exited", "unknown"}) {
			return nil, errors.Errorf("%s is not a valid status", filterValue)
		}
		return func(p *libpod.Pod) bool {
			ctr_statuses, err := p.Status()
			if err != nil {
				return false
			}
			for _, ctr_status := range ctr_statuses {
				state := ctr_status.String()
				if ctr_status == define.ContainerStateConfigured {
					state = "created"
				}
				if state == filterValue {
					return true
				}
			}
			return false
		}, nil
	case "id":
		return func(p *libpod.Pod) bool {
			return strings.Contains(p.ID(), filterValue)
		}, nil
	case "name":
		return func(p *libpod.Pod) bool {
			return strings.Contains(p.Name(), filterValue)
		}, nil
	case "status":
		if !util.StringInSlice(filterValue, []string{"stopped", "running", "paused", "exited", "dead", "created"}) {
			return nil, errors.Errorf("%s is not a valid pod status", filterValue)
		}
		return func(p *libpod.Pod) bool {
			status, err := p.GetPodStatus()
			if err != nil {
				return false
			}
			if strings.ToLower(status) == filterValue {
				return true
			}
			return false
		}, nil
	case "label":
		var filterArray = strings.SplitN(filterValue, "=", 2)
		var filterKey = filterArray[0]
		if len(filterArray) > 1 {
			filterValue = filterArray[1]
		} else {
			filterValue = ""
		}
		return func(p *libpod.Pod) bool {
			for labelKey, labelValue := range p.Labels() {
				if labelKey == filterKey && ("" == filterValue || labelValue == filterValue) {
					return true
				}
			}
			return false
		}, nil
	}
	return nil, errors.Errorf("%s is an invalid filter", filter)
}

var DefaultKernelNamespaces = "cgroup,ipc,net,uts"