package proxy

import (
	"net/http"
	"strings"

	"github.com/fsouza/go-dockerclient"
	. "github.com/weaveworks/weave/common"
)

type createExecInterceptor struct{ proxy *Proxy }

func (i *createExecInterceptor) InterceptRequest(r *http.Request) error {
	options := docker.CreateExecOptions{}
	if err := unmarshalRequestBody(r, &options); err != nil {
		return err
	}

	container, err := inspectContainerInPath(i.proxy.client, r.URL.Path)
	if err != nil {
		return err
	}

	if _, hasWeaveWait := container.Volumes["/w"]; !hasWeaveWait {
		return nil
	}

	cidrs, err := i.proxy.weaveCIDRsFromConfig(container.Config, container.HostConfig)
	if err != nil {
		Log.Infof("Leaving container %s alone because %s", container.ID, err)
		return nil
	}

	Log.Infof("Exec in container %s with WEAVE_CIDR \"%s\"", container.ID, strings.Join(cidrs, " "))
	options.Cmd = append(weaveWaitEntrypoint, options.Cmd...)

	return marshalRequestBody(r, options)
}

func (i *createExecInterceptor) InterceptResponse(r *http.Response) error {
	return nil
}