// GET: /user
func (cr *UserController) ReadMany(cx *goweb.Context) {
	// Log Request and check for Auth
	LogRequest(cx.Request)
	u, err := AuthenticateRequest(cx.Request)
	if err != nil {
		if err.Error() == e.NoAuth || err.Error() == e.UnAuth {
			cx.RespondWithError(http.StatusUnauthorized)
			return
		} else {
			log.Error("[email protected]_Read: " + err.Error())
			cx.RespondWithError(http.StatusInternalServerError)
			return
		}
	}
	if u.Admin {
		users := user.Users{}
		user.AdminGet(&users)
		if len(users) > 0 {
			cx.RespondWithData(users)
			return
		} else {
			cx.RespondWithNotFound()
			return
		}
	} else {
		cx.RespondWithError(http.StatusUnauthorized)
		return
	}
}

// GET: /client/{id}
func (cr *ClientController) Read(id string, cx *goweb.Context) {
	LogRequest(cx.Request)

	// Gather query params
	query := &Query{list: cx.Request.URL.Query()}
	if query.Has("heartbeat") {
		client, err := queueMgr.ClientHeartBeat(id)
		if err != nil {
			cx.RespondWithErrorMessage(err.Error(), http.StatusBadRequest)
		} else {
			cx.RespondWithData(client.Id)
		}
		return
	}

	client, err := queueMgr.GetClient(id)
	if err != nil {
		if err.Error() == e.ClientNotFound {
			cx.RespondWithErrorMessage(e.ClientNotFound, http.StatusBadRequest)
		} else {
			Log.Error("Error in GET client:" + err.Error())
			cx.RespondWithError(http.StatusBadRequest)
		}
		return
	}
	cx.RespondWithData(client)
}

// DELETE: /job/{id}
func (cr *JobController) Delete(id string, cx *goweb.Context) {
	LogRequest(cx.Request)
	if err := queueMgr.DeleteJob(id); err != nil {
		cx.RespondWithErrorMessage("fail to delete job: "+id, http.StatusBadRequest)
		return
	}
	cx.RespondWithData("job deleted: " + id)
	return
}

// GET: /queue
// get status from queue manager
func (cr *QueueController) ReadMany(cx *goweb.Context) {
	LogRequest(cx.Request)

	// Gather query params
	//	query := &Query{list: cx.Request.URL.Query()}

	msg := queueMgr.ShowStatus()
	cx.RespondWithData(msg)
}

func ResourceDescription(cx *goweb.Context) {
	LogRequest(cx.Request)
	r := resource{
		R: []string{"job", "work", "client", "queue"},
		U: apiUrl(cx) + "/",
		D: siteUrl(cx) + "/",
		C: conf.ADMIN_EMAIL,
		I: "AWE",
		T: "AWE",
	}
	cx.WriteResponse(r, 200)
}

func ResourceDescription(cx *goweb.Context) {
	LogRequest(cx.Request)
	r := resource{
		R: []string{"node", "user"},
		U: apiUrl(cx) + "/",
		D: siteUrl(cx) + "/",
		C: conf.ADMIN_EMAIL,
		I: "Shock",
		T: "Shock",
	}
	cx.WriteResponse(r, 200)
}

// DELETE: /job?suspend
func (cr *JobController) DeleteMany(cx *goweb.Context) {
	LogRequest(cx.Request)
	// Gather query params
	query := &Query{list: cx.Request.URL.Query()}

	if query.Has("suspend") {
		num := queueMgr.DeleteSuspendedJobs()
		cx.RespondWithData(fmt.Sprintf("deleted %d suspended jobs", num))
	} else {
		cx.RespondWithError(http.StatusNotImplemented)
	}
	return
}

func handleAuthError(err error, cx *goweb.Context) {
	switch err.Error() {
	case e.MongoDocNotFound:
		cx.RespondWithErrorMessage("Invalid username or password", http.StatusBadRequest)
		return
		//	case e.InvalidAuth:
		//		cx.RespondWithErrorMessage("Invalid Authorization header", http.StatusBadRequest)
		//		return
	}
	Log.Error("Error at Auth: " + err.Error())
	cx.RespondWithError(http.StatusInternalServerError)
	return
}

func PreAuthRequest(cx *goweb.Context) {
	LogRequest(cx.Request)
	id := cx.PathParams["id"]
	if p, err := store.LoadPreAuth(id); err != nil {
		if err.Error() == e.MongoDocNotFound {
			cx.RespondWithNotFound()
		} else {
			cx.RespondWithError(http.StatusInternalServerError)
			log.Error("err:@preAuth load: " + err.Error())
		}
		return
	} else {
		if node, err := store.LoadNodeUnauth(p.NodeId); err == nil {
			switch p.Type {
			case "download":
				filename := node.Id
				if fn, has := p.Options["filename"]; has {
					filename = fn
				}
				streamDownload(cx, node, filename)
				store.DeletePreAuth(id)
				return
			default:
				cx.RespondWithError(http.StatusInternalServerError)
			}
		} else {
			cx.RespondWithError(http.StatusInternalServerError)
			log.Error("err:@preAuth loadnode: " + err.Error())
		}
	}
	return
}

// PUT: /work/{id} -> status update
func (cr *WorkController) Update(id string, cx *goweb.Context) {
	// Log Request and check for Auth
	LogRequest(cx.Request)
	// Gather query params
	query := &Query{list: cx.Request.URL.Query()}
	if query.Has("status") && query.Has("client") { //notify execution result: "done" or "fail"
		notice := core.Notice{WorkId: id, Status: query.Value("status"), ClientId: query.Value("client")}
		defer queueMgr.NotifyWorkStatus(notice)

		if query.Has("report") { // if "report" is specified in query, parse performance statistics
			_, files, err := ParseMultipartForm(cx.Request)
			if err != nil {
				Log.Error("[email protected]_Update_ParseMultipartForm: " + err.Error())
				cx.RespondWithErrorMessage(err.Error(), http.StatusBadRequest)
				return
			}
			if _, ok := files["perf"]; !ok {
				Log.Error("[email protected]_Update: no perf file uploaded")
				cx.RespondWithErrorMessage("no perf file uploaded", http.StatusBadRequest)
				return
			}
			if err := queueMgr.FinalizeWorkPerf(id, files["perf"].Path); err != nil {
				Log.Error("[email protected]_Update_FinalizeWorkPerf: " + err.Error())
				cx.RespondWithErrorMessage(err.Error(), http.StatusBadRequest)
				return
			}
		}
	}
	cx.RespondWithData("ok")
	return
}

// GET: /work/{id}
// get a workunit by id, read-only
func (cr *WorkController) Read(id string, cx *goweb.Context) {
	LogRequest(cx.Request)

	// Load workunit by id
	workunit, err := queueMgr.GetWorkById(id)

	if err != nil {
		if err.Error() != e.QueueEmpty {
			Log.Error("[email protected]_Read:QueueMgr.GetWorkById(): " + err.Error())
		}
		cx.RespondWithErrorMessage(err.Error(), http.StatusBadRequest)
		return
	}
	// Base case respond with workunit in json
	cx.RespondWithData(workunit)
	return
}

func ResourceDescription(cx *goweb.Context) {
	LogRequest(cx.Request)
	host := ""
	if strings.Contains(cx.Request.Host, ":") {
		split := strings.Split(cx.Request.Host, ":")
		host = split[0]
	} else {
		host = cx.Request.Host
	}
	r := resource{
		R: []string{"job", "work", "client"},
		U: "http://" + host + ":" + fmt.Sprint(conf.API_PORT) + "/",
		D: "http://" + host + ":" + fmt.Sprint(conf.SITE_PORT) + "/",
		C: conf.ADMIN_EMAIL,
		I: "AWE",
		T: "AWE",
	}
	cx.WriteResponse(r, 200)
}

// GET: /client
func (cr *ClientController) ReadMany(cx *goweb.Context) {
	LogRequest(cx.Request)
	clients := queueMgr.GetAllClients()
	if len(clients) == 0 {
		cx.RespondWithErrorMessage(e.ClientNotFound, http.StatusBadRequest)
		return
	}

	query := &Query{list: cx.Request.URL.Query()}
	filtered := []*core.Client{}
	if query.Has("busy") {
		for _, client := range clients {
			if len(client.Current_work) > 0 {
				filtered = append(filtered, client)
			}
		}
	} else {
		filtered = clients
	}
	cx.RespondWithData(filtered)
}

func streamDownload(cx *goweb.Context, node *store.Node, filename string) {
	query := &Query{list: cx.Request.URL.Query()}
	nf, err := node.FileReader()
	if err != nil {
		// File not found or some sort of file read error.
		// Probably deserves more checking
		log.Error("err:@preAuth node.FileReader: " + err.Error())
		cx.RespondWithError(http.StatusBadRequest)
		return
	}
	if query.Has("filename") {
		filename = query.Value("filename")
	}
	s := &streamer{rs: []store.SectionReader{nf}, ws: cx.ResponseWriter, contentType: "application/octet-stream", filename: filename, size: node.File.Size, filter: nil}
	err = s.stream()
	if err != nil {
		// causes "multiple response.WriteHeader calls" error but better than no response
		cx.RespondWithErrorMessage(err.Error(), http.StatusBadRequest)
		log.Error("err:@preAuth: s.stream: " + err.Error())
	}
}

// POST: /client
func (cr *ClientController) Create(cx *goweb.Context) {
	// Log Request and check for Auth
	LogRequest(cx.Request)

	// Parse uploaded form
	_, files, err := ParseMultipartForm(cx.Request)
	if err != nil {
		if err.Error() != "request Content-Type isn't multipart/form-data" {
			Log.Error("Error parsing form: " + err.Error())
			cx.RespondWithError(http.StatusBadRequest)
			return
		}
	}

	client, err := queueMgr.RegisterNewClient(files)
	if err != nil {
		msg := "Error in registering new client:" + err.Error()
		Log.Error(msg)
		cx.RespondWithErrorMessage(msg, http.StatusBadRequest)
		return
	}

	//log event about client registration (CR)
	Log.Event(EVENT_CLIENT_REGISTRATION, "clientid="+client.Id+";name="+client.Name)

	cx.RespondWithData(client)
	return
}

// PUT: /client/{id} -> status update
func (cr *ClientController) Update(id string, cx *goweb.Context) {
	LogRequest(cx.Request)
	client, err := queueMgr.ClientHeartBeat(id)
	if err != nil {
		if err.Error() == e.ClientNotFound {
			cx.RespondWithErrorMessage(e.ClientNotFound, http.StatusBadRequest)
		} else {
			Log.Error("Error in handle client heartbeat:" + err.Error())
			cx.RespondWithError(http.StatusBadRequest)
		}
		return
	}
	cx.RespondWithData(client)
}

// GET: /work
// checkout a workunit with earliest submission time
// to-do: to support more options for workunit checkout
func (cr *WorkController) ReadMany(cx *goweb.Context) {

	// Gather query params
	query := &Query{list: cx.Request.URL.Query()}

	if !query.Has("client") { //view workunits
		var workunits []*core.Workunit
		if query.Has("state") {
			workunits = queueMgr.ShowWorkunits(query.Value("state"))
		} else {
			workunits = queueMgr.ShowWorkunits("")
		}
		cx.RespondWithData(workunits)
		return
	}

	//checkout a workunit in FCFS order
	clientid := query.Value("client")
	workunits, err := queueMgr.CheckoutWorkunits("FCFS", clientid, 1)

	if err != nil {
		if err.Error() != e.QueueEmpty && err.Error() != e.NoEligibleWorkunitFound {
			Log.Error("[email protected]_ReadMany:QueueMgr.GetWorkByFCFS(): " + err.Error())
		}
		cx.RespondWithErrorMessage(err.Error(), http.StatusBadRequest)
		return
	}

	//log access info only when the queue is not empty, save some log
	LogRequest(cx.Request)

	//log event about workunit checkout (WO)
	workids := []string{}
	for _, work := range workunits {
		workids = append(workids, work.Id)
	}

	Log.Event(EVENT_WORK_CHECKOUT,
		"workids="+strings.Join(workids, ","),
		"clientid="+clientid)

	// Base case respond with node in json
	cx.RespondWithData(workunits[0])
	return
}

// GET: /job/{id}
func (cr *JobController) Read(id string, cx *goweb.Context) {
	LogRequest(cx.Request)

	// Load job by id
	job, err := core.LoadJob(id)
	if err != nil {
		if err.Error() == e.MongoDocNotFound {
			cx.RespondWithNotFound()
			return
		} else {
			// In theory the db connection could be lost between
			// checking user and load but seems unlikely.
			Log.Error("[email protected]_Read:LoadJob: " + id + ":" + err.Error())
			cx.RespondWithErrorMessage("job not found:"+id, http.StatusBadRequest)
			return
		}
	}
	// Base case respond with job in json
	cx.RespondWithData(job)
	return
}

// DELETE: /node
func (cr *Controller) DeleteMany(cx *goweb.Context) {
	request.Log(cx.Request)
	cx.RespondWithError(http.StatusNotImplemented)
}

// Options: /node
func (cr *Controller) Options(cx *goweb.Context) {
	request.Log(cx.Request)
	cx.RespondWithOK()
	return
}