package main

import (
	"fmt"
	"log"
	"net/http"
	"regexp"
)

// tracker handler

func save_tracker_settingsHandler(response http.ResponseWriter, request *http.Request) {
	name := getUserName(request)
	if name != "" {

		deveui, ok := request.URL.Query()["deveui"]

		if !ok || len(deveui[0]) < 1 {
			log.Println("Url Param 'deveui' is missing")
			fmt.Fprintf(response, "{ \"rc\": 1, \"msg\": \"deveui must be specified in URL\" }")
			return
		}
		// Query()["deveui"] will return an array of items,
		// we only want the single item.
		mydeveui := deveui[0]

		if len(mydeveui) != 16 {
			log.Println("specified 'deveui' has invalid length")
			fmt.Fprintf(response, "{ \"rc\": 8, \"msg\": \"specified deveui has invalid length\" }")
			return
		}

		if !(Contains(getMyDevs(name), mydeveui)) {
			log.Println("specified 'deveui' does not belong to this user")
			fmt.Fprintf(response, "{ \"rc\": 2, \"msg\": \"specified deveui does not belong to this user\" }")
			return
		}

		log.Println("Url Param 'deveui' is: " + string(mydeveui))

		alias, ok2 := request.URL.Query()["alias"]

		if !ok2 || len(alias[0]) < 1 {
			log.Println("Url Param 'alias' is missing")
			fmt.Fprintf(response, "{ \"rc\": 3, \"msg\": \"alias must be specified in URL\" }")
			return
		}
		myalias := alias[0]

		// validate alias
		match, _ := regexp.MatchString("^[a-zA-Z0-9 ]{1,25}$", myalias)
		if !(match) {
			log.Println("Url Param 'alias' is not valid")
			fmt.Fprintf(response, "{ \"rc\": 9, \"msg\": \"alias is not valid\" }")
			return
		}

		var mydev Dev
		mydev.Deveui = mydeveui
		mydev.Alias = myalias

		// now we try to save the settings
		err := updateTrackerSettings(mydev)

		if err != nil {
			log.Println("Error to Update Device Settings")
			fmt.Fprintf(response, "{ \"rc\": 6, \"msg\": \"error with saving device settings\" }")
			return
		} else {
			fmt.Fprintf(response, "{ \"rc\": 0, \"msg\": \"SUCCESS\" }")
		}

	} else {
		fmt.Fprintf(response, "{ \"rc\": 7, \"msg\": \"Only available for logged in users\" }")
	}
}