package internal

import (
	"net/http"

	"github.com/julienschmidt/httprouter"
	log "github.com/sirupsen/logrus"
	"github.com/unrolled/render"

	"go.mills.io/saltyim"
)

// API ...
type API struct {
	router *Router
	config *Config
	db     Store

	r *render.Render
}

// NewAPI ...
func NewAPI(router *Router, config *Config, db Store) *API {
	api := &API{router, config, db, render.New()}

	api.initRoutes()

	return api
}

func (a *API) initRoutes() {
	router := a.router.Group("/api/v1")

	router.GET("/ping", a.PingEndpoint())
	router.GET("/lookup/:addr", a.LookupEndpoint())
	router.POST("/send", a.SendEndpoint())
}

// PingEndpoint ...
func (a *API) PingEndpoint() httprouter.Handle {
	return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{}`))
	}
}

// LookupEndpoint ...
func (a *API) LookupEndpoint() httprouter.Handle {
	return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
		addr, err := saltyim.LookupAddr(p.ByName("addr"))
		if err != nil {
			http.Error(w, "Lookup Error", http.StatusBadRequest)
			return
		}
		a.r.JSON(w, http.StatusOK, addr)
	}
}

// SendEndpoint ...
func (a *API) SendEndpoint() httprouter.Handle {
	return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
		req, signer, err := saltyim.NewSendRequest(r.Body)
		if err != nil {
			log.WithError(err).Error("error parsing send request")
			http.Error(w, "Bad Request", http.StatusBadRequest)
			return
		}
		// TODO: Do something with signer?
		log.Debugf("request signed by %s", signer)

		// TODO: Queue up an internal retry and return immediately on failure?
		if err := saltyim.Send(req.Endpoint, req.Message, req.Capabilities); err != nil {
			log.WithError(err).Errorf("error sending message to %s", req.Endpoint)
			http.Error(w, "Send Error", http.StatusInternalServerError)
			return
		}

		http.Error(w, "Message Accepted", http.StatusAccepted)
	}
}