package main

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

	"git.hamburg.ccc.de/ccchh/spaceapid/config"
	"git.hamburg.ccc.de/ccchh/spaceapid/handlers"
	"git.hamburg.ccc.de/ccchh/spaceapid/persistence"
	"git.hamburg.ccc.de/ccchh/spaceapid/types"
	"git.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
	persistence.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...")
		persistence.SaveCurrentState(*resp)
		os.Exit(0)
	}(&conf.Response)

	// Root handler
	http.HandleFunc("GET /{$}",
		handlers.Root(&conf.Response),
	)
	// state->open
	http.HandleFunc("PUT /state/open",
		handlers.StateOpen(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
	)
	// state->message
	http.HandleFunc("PUT /state/message",
		handlers.StateMessagePUT(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
	)
	http.HandleFunc("DELETE /state/message",
		handlers.StateMessageDELETE(conf.Credentials, conf.Dynamic.State.Open.AllowedCredentials, &conf.Response.State),
	)
	// Register handlers for environmental sensors
	for sensorType, envSensorConfigs := range conf.Dynamic.Sensors {
		for i, envSensorConfig := range envSensorConfigs {
			urlPattern := "PUT " + util.GetSensorURLPath(
				sensorType, envSensorConfig.SensorData.Location, envSensorConfig.SensorData.Name,
			)
			http.HandleFunc(
				urlPattern,
				handlers.EnvironmentSensor(
					conf.Credentials, envSensorConfig.AllowedCredentials, &conf.Response.Sensors[sensorType][i],
				),
			)
		}
	}

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