package main

import (
	"database/sql"
	"flag"
	"log"
	"net/http"
	"os"
	"os/signal"

	_ "github.com/lib/pq"
)

var (
	db *sql.DB
)

func main() {
	// Set up flags
	log.Println("Setting up components")
	registerHTTPFlags()
	flag.Parse()

	// Set up HTTP server
	log.Printf("Running HTTP server on port %d", *port)
	httpServer := setupHTTPServer()

	// Set up the DB connection
	database, err := setupDatabase()
	if err != nil {
		log.Println(err)
		return
	}
	db = database

	// React to system signals
	signalChannel := make(chan os.Signal, 1)
	signal.Notify(signalChannel)
	go cleanup(signalChannel, httpServer)

	// Start our HTTP server
	log.Fatalln(httpServer.ListenAndServe())
}

func cleanup(signalChannel chan os.Signal, server http.Server) {
	// Block until we receive a signal
	<-signalChannel
	log.Println("Requested shutdown")

	// Stop everything
	log.Println("Stopping HTTP server")
	server.Close()
	os.Exit(0)
}