package main

import (
	"net/http"

	"github.com/gorilla/mux"
	"github.com/mattermost/mattermost/server/public/plugin"
)

// ServeHTTP demonstrates a plugin that handles HTTP requests by greeting the world.
// The root URL is currently <siteUrl>/plugins/com.mattermost.bridge-xmpp/api/v1/. Replace com.mattermost.bridge-xmpp with the plugin ID.
func (p *Plugin) ServeHTTP(c *plugin.Context, w http.ResponseWriter, r *http.Request) {
	router := mux.NewRouter()

	// Middleware to require that the user is logged in
	router.Use(p.MattermostAuthorizationRequired)

	apiRouter := router.PathPrefix("/api/v1").Subrouter()

	apiRouter.HandleFunc("/hello", p.HelloWorld).Methods(http.MethodGet)

	router.ServeHTTP(w, r)
}

func (p *Plugin) MattermostAuthorizationRequired(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		userID := r.Header.Get("Mattermost-User-ID")
		if userID == "" {
			http.Error(w, "Not authorized", http.StatusUnauthorized)
			return
		}

		next.ServeHTTP(w, r)
	})
}

func (p *Plugin) HelloWorld(w http.ResponseWriter, r *http.Request) {
	if _, err := w.Write([]byte("Hello, world!")); err != nil {
		p.API.LogError("Failed to write response", "error", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}