package wsrpc

//go:generate folder2go client wsrpcAssets

import (
	"net/http"
	"strings"

	"dev.hexasoftware.com/stdio/wsrpc/wsrpcAssets" // embed assets

	"golang.org/x/net/websocket"
)

// Handler wsrpc.Handler
type Handler struct {
	wsHandler http.Handler

	prefix string
}

func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Get relative path
	if h.prefix == "" {
		server := r.Context().Value(http.ServerContextKey).(*http.Server)
		mux, ok := server.Handler.(*http.ServeMux)
		if ok {
			_, h.prefix = mux.Handler(r)
		}
	}
	urlPath := strings.TrimPrefix(r.URL.String(), h.prefix)

	switch urlPath {
	case "ws", "wsrpc":
		h.wsHandler.ServeHTTP(w, r)
	case "cli.js", "wsrpc.js": // Serve client JS file
		w.Header().Set("Content-type", "application/javascript")
		w.WriteHeader(200)
		w.Write(wsrpcAssets.Data["wsrpc.js"])
	default:
		w.WriteHeader(http.StatusNotFound)
		w.Write([]byte(http.StatusText(http.StatusNotFound)))
	}
}

// New create a new WSRpc handler
func New(WSRPC Func) *Handler {
	return &Handler{
		wsHandler: websocket.Handler(createCliHandler(WSRPC)),
	}
}

// Func for wsrpc
type Func func(*ClientCtx)

// Create a client websocket handler on connection
func createCliHandler(handler Func) websocket.Handler {
	// Move this to clientCTX handler
	return func(ws *websocket.Conn) {
		cli := NewClient(ws)
		go handler(cli) // Paralell launch a client initiator
		cli.Process()   // blocks
	}
}