package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"strings"
	"syscall"

	"gitlab.hamburg.ccc.de/ccchh/spaceapid/config"
	"gitlab.hamburg.ccc.de/ccchh/spaceapid/handlers"
	"gitlab.hamburg.ccc.de/ccchh/spaceapid/types"
	"gitlab.hamburg.ccc.de/ccchh/spaceapid/util"
)

var (
	flagHelp bool
	version  string
)

func init() {
	flag.BoolVar(&flagHelp, "h", false, "Print help output")
}

func main() {
	log.Println("SpaceAPId version", version)

	flag.Parse()

	if flagHelp {
		flag.PrintDefaults()
		os.Exit(0)
	}

	// Get spaceapid configuration
	conf := config.ParseConfiguration()

	// Merge old state if present
	util.MergeOldState(&conf.Response)

	// Register signal handler
	sc := make(chan os.Signal, 1)
	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM)
	go func(resp *types.SpaceAPIResponseV14) {
		<-sc
		log.Println("Saving state and shutting down...")
		util.SaveCurrentState(*resp)
		os.Exit(0)
	}(&conf.Response)

	// Register HTTP handlers
	http.HandleFunc("/",
		handlers.Root(&conf.Response),
	)
	http.HandleFunc("/state/open",
		handlers.StateOpen(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
	)
	// Register handlers for Environmental Sensors
	for key, envSensorConfigs := range conf.Dynamic.Sensors {
		for i, envSensorConfig := range envSensorConfigs {
			pattern := fmt.Sprintf("/sensors/%s/%s", key, envSensorConfig.SensorData.Location)
			if envSensorConfig.SensorData.Name != "" {
				pattern += "/" + envSensorConfig.SensorData.Name
			}
			http.HandleFunc(strings.ToLower(pattern),
				handlers.EnvironmentSensor(
					conf.Credentials, envSensorConfig.AllowedCredentials, &conf.Response.Sensors[key][i],
				),
			)
		}
	}

	// Start webserver
	log.Println("Starting HTTP server...")
	log.Fatalln(http.ListenAndServe(":8080", nil))
}