package network

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/url"

	"github.com/pkg/errors"
	"github.com/virtual-kubelet/virtual-kubelet/providers/azure/client/api"
)

const (
	profilePath = "subscriptions/{{.subscriptionId}}/resourcegroups/{{.resourceGroupName}}/providers/Microsoft.Network/networkProfiles/{{.profileName}}"
)

// Profile represents an Azure network profile
type Profile struct {
	Name       string
	ID         string
	ETag       string `json:"etag"`
	Type       string
	Location   string
	Properties ProfileProperties
}

// ProfileProperties stores the properties for network profiles
type ProfileProperties struct {
	ContainerNetworkInterfaceConfigurations []InterfaceConfiguration
}

// InterfaceConfiguration is a configuration for a network interface
type InterfaceConfiguration struct {
	Name       string
	Properties InterfaceConfigurationProperties
}

// InterfaceConfigurationProperties is the properties for a network interface configuration
type InterfaceConfigurationProperties struct {
	IPConfigurations []IPConfiguration
}

// IPConfiguration stores the configuration for an IP on a network profile
type IPConfiguration struct {
	Name       string
	Properties IPConfigurationProperties
}

// IPConfigurationProperties stores the subnet for an IP configuration
type IPConfigurationProperties struct {
	Subnet ID
}

// ID is a generic struct for objets with an ID
type ID struct {
	ID string
}

// GetProfile gets the network profile with the provided name
func (c *Client) GetProfile(resourceGroup, name string) (*Profile, error) {
	urlParams := url.Values{
		"api-version": []string{apiVersion},
	}

	// Create the url.
	uri := api.ResolveRelative(baseURI, profilePath)
	uri += "?" + url.Values(urlParams).Encode()

	// Create the request.
	req, err := http.NewRequest("GET", uri, nil)
	if err != nil {
		return nil, errors.Wrap(err, "creating network profile get uri request failed")
	}

	// Add the parameters to the url.
	if err := api.ExpandURL(req.URL, map[string]string{
		"subscriptionId":    c.auth.SubscriptionID,
		"resourceGroupName": resourceGroup,
		"profileName":       name,
	}); err != nil {
		return nil, errors.Wrap(err, "expanding URL with parameters failed")
	}

	// Send the request.
	resp, err := c.hc.Do(req)
	if err != nil {
		return nil, errors.Wrap(err, "sending get network profile request failed")
	}
	defer resp.Body.Close()

	// 200 (OK) is a success response.
	if err := api.CheckResponse(resp); err != nil {
		return nil, err
	}

	// Decode the body from the response.
	if resp.Body == nil {
		return nil, errors.New("get network profile returned an empty body in the response")
	}
	var p Profile
	if err := json.NewDecoder(resp.Body).Decode(&p); err != nil {
		return nil, errors.Wrap(err, "decoding get network profile response body failed")
	}
	return &p, nil
}

// CreateOrUpdateProfile creates or updates an Azure network profile
func (c *Client) CreateOrUpdateProfile(resourceGroup string, p *Profile) error {
	urlParams := url.Values{
		"api-version": []string{apiVersion},
	}

	// Create the url.
	uri := api.ResolveRelative(baseURI, profilePath)
	uri += "?" + url.Values(urlParams).Encode()

	// Create the request.
	b, err := json.Marshal(p)
	if err != nil {
		return errors.Wrap(err, "marshalling networking profile failed")
	}

	req, err := http.NewRequest("PUT", uri, bytes.NewReader(b))
	if err != nil {
		return errors.Wrap(err, "creating network profile create uri request failed")
	}

	// Add the parameters to the url.
	if err := api.ExpandURL(req.URL, map[string]string{
		"subscriptionId":    c.auth.SubscriptionID,
		"resourceGroupName": resourceGroup,
		"profileName":       p.Name,
	}); err != nil {
		return errors.Wrap(err, "expanding URL with parameters failed")
	}

	// Send the request.
	resp, err := c.hc.Do(req)
	if err != nil {
		return errors.Wrap(err, "sending get network profile request failed")
	}
	defer resp.Body.Close()

	// 200 (OK) is a success response.
	if err := api.CheckResponse(resp); err != nil {
		return err
	}
	return errors.Wrap(json.NewDecoder(resp.Body).Decode(p), "error decoding network profile create response")
}