package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/pboehm/ddns/connection"
	"log"
	"net"
	"os"
)

func HandleErr(err error) {
	if err != nil {
		log.Fatal(err)
	}
}

func RunBackend() {
	/* code */
}

func RunWebService() {
	conn := connection.OpenConnection()
	defer conn.Close()

	r := gin.Default()
	r.GET("/new/:hostname", func(c *gin.Context) {
		hostname := c.Params.ByName("hostname")

		if conn.HostExist(hostname) {
			c.String(403, "This hostname has already been registered.")
			return
		}

		host := &connection.Host{Hostname: hostname, Ip: "127.0.0.1"}
		host.GenerateAndSetToken()

		conn.SaveHost(host)

		c.String(200, fmt.Sprintf(
			"Go to /update/%s/%s for updating your IP address",
			host.Hostname, host.Token))
	})

	r.GET("/update/:hostname/:token", func(c *gin.Context) {
		hostname := c.Params.ByName("hostname")
		token := c.Params.ByName("token")

		if !conn.HostExist(hostname) {
			c.String(404,
				"This hostname has not been registered or is expired.")
			return
		}

		host := conn.GetHost(hostname)

		if host.Token != token {
			c.String(403,
				"You have supplied the wrong token to manipulate this host")
			return
		}

		ip, _, err := net.SplitHostPort(c.Req.RemoteAddr)
		if err != nil {
			c.String(500, "You sender IP address is not in the right format")
		}

		host.Ip = ip
		conn.SaveHost(host)

		c.String(200, fmt.Sprintf("Your current IP is %s", ip))
	})

	r.Run(":8080")
}

func main() {

	if len(os.Args) < 2 {
		usage()
	}

	cmd := os.Args[1]

	switch cmd {
	case "backend":
		log.Printf("Starting PDNS Backend\n")
		RunBackend()
	case "web":
		log.Printf("Starting Web Service\n")
		RunWebService()
	default:
		usage()
	}
}

func usage() {
	log.Fatal("Usage: ./ddns [backend|web]")
}