package hcsshim

import (
	"encoding/json"
	"fmt"
	"net"

	"github.com/Sirupsen/logrus"
)

type NatPolicy struct {
	Type         string
	Protocol     string
	InternalPort uint16
	ExternalPort uint16
}

type QosPolicy struct {
	Type                            string
	MaximumOutgoingBandwidthInBytes uint64
}

type VlanPolicy struct {
	Type string
	VLAN uint
}

type VsidPolicy struct {
	Type string
	VSID uint
}

type PaPolicy struct {
	Type string
	PA   string
}

// Subnet is assoicated with a network and represents a list
// of subnets available to the network
type Subnet struct {
	AddressPrefix  string            `json:",omitempty"`
	GatewayAddress string            `json:",omitempty"`
	Policies       []json.RawMessage `json:",omitempty"`
}

// MacPool is assoicated with a network and represents a list
// of macaddresses available to the network
type MacPool struct {
	StartMacAddress string `json:",omitempty"`
	EndMacAddress   string `json:",omitempty"`
}

// HNSNetwork represents a network in HNS
type HNSNetwork struct {
	Id                   string            `json:",omitempty"`
	Name                 string            `json:",omitempty"`
	Type                 string            `json:",omitempty"`
	NetworkAdapterName   string            `json:",omitempty"`
	SourceMac            string            `json:",omitempty"`
	Policies             []json.RawMessage `json:",omitempty"`
	MacPools             []MacPool         `json:",omitempty"`
	Subnets              []Subnet          `json:",omitempty"`
	DNSSuffix            string            `json:",omitempty"`
	DNSServerList        string            `json:",omitempty"`
	DNSServerCompartment uint32            `json:",omitempty"`
	ManagementIP         string            `json:",omitempty"`
}

// HNSEndpoint represents a network endpoint in HNS
type HNSEndpoint struct {
	Id                 string            `json:",omitempty"`
	Name               string            `json:",omitempty"`
	VirtualNetwork     string            `json:",omitempty"`
	VirtualNetworkName string            `json:",omitempty"`
	Policies           []json.RawMessage `json:",omitempty"`
	MacAddress         string            `json:",omitempty"`
	IPAddress          net.IP            `json:",omitempty"`
	DNSSuffix          string            `json:",omitempty"`
	DNSServerList      string            `json:",omitempty"`
	GatewayAddress     string            `json:",omitempty"`
	EnableInternalDNS  bool              `json:",omitempty"`
	PrefixLength       uint8             `json:",omitempty"`
	IsRemoteEndpoint   bool              `json:",omitempty"`
}

type hnsNetworkResponse struct {
	Success bool
	Error   string
	Output  HNSNetwork
}

type hnsResponse struct {
	Success bool
	Error   string
	Output  json.RawMessage
}

func hnsCall(method, path, request string, returnResponse interface{}) error {
	var responseBuffer *uint16
	err := _hnsCall(method, path, request, &responseBuffer)
	if err != nil {
		return makeError(err, "hnsCall ", "")
	}
	response := convertAndFreeCoTaskMemString(responseBuffer)

	hnsresponse := &hnsResponse{}
	if err = json.Unmarshal([]byte(response), &hnsresponse); err != nil {
		return err
	}

	if !hnsresponse.Success {
		return fmt.Errorf("HNS failed with error : %s", hnsresponse.Error)
	}

	if len(hnsresponse.Output) == 0 {
		return nil
	}

	logrus.Debugf("Network Response : %s", hnsresponse.Output)
	err = json.Unmarshal(hnsresponse.Output, returnResponse)
	if err != nil {
		return err
	}

	return nil
}

// HNSNetworkRequest makes a call into HNS to update/query a single network
func HNSNetworkRequest(method, path, request string) (*HNSNetwork, error) {
	var network HNSNetwork
	err := hnsCall(method, "/networks/"+path, request, &network)
	if err != nil {
		return nil, err
	}

	return &network, nil
}

// HNSListNetworkRequest makes a HNS call to query the list of available networks
func HNSListNetworkRequest(method, path, request string) ([]HNSNetwork, error) {
	var network []HNSNetwork
	err := hnsCall(method, "/networks/"+path, request, &network)
	if err != nil {
		return nil, err
	}

	return network, nil
}

// HNSEndpointRequest makes a HNS call to modify/query a network endpoint
func HNSEndpointRequest(method, path, request string) (*HNSEndpoint, error) {
	endpoint := &HNSEndpoint{}
	err := hnsCall(method, "/endpoints/"+path, request, &endpoint)
	if err != nil {
		return nil, err
	}

	return endpoint, nil
}