package http

import (
	"github.com/portainer/portainer"

	"net/http"
	"strings"
)

// Service represents a service to manage HTTP middlewares
type middleWareService struct {
	jwtService portainer.JWTService
}

func addMiddleware(h http.Handler, middleware ...func(http.Handler) http.Handler) http.Handler {
	for _, mw := range middleware {
		h = mw(h)
	}
	return h
}

func (service *middleWareService) addMiddleWares(h http.Handler) http.Handler {
	h = service.middleWareSecureHeaders(h)
	h = service.middleWareAuthenticate(h)
	return h
}

// middleWareAuthenticate provides secure headers middleware for handlers
func (*middleWareService) middleWareSecureHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("X-Content-Type-Options", "nosniff")
		w.Header().Add("X-Frame-Options", "DENY")
		next.ServeHTTP(w, r)
	})
}

// middleWareAuthenticate provides Authentication middleware for handlers
func (service *middleWareService) middleWareAuthenticate(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var token string

		// Get token from the Authorization header
		tokens, ok := r.Header["Authorization"]
		if ok && len(tokens) >= 1 {
			token = tokens[0]
			token = strings.TrimPrefix(token, "Bearer ")
		}

		if token == "" {
			http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
			return
		}

		err := service.jwtService.VerifyToken(token)
		if err != nil {
			http.Error(w, err.Error(), http.StatusUnauthorized)
			return
		}

		next.ServeHTTP(w, r)
		return
	})
}