package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/http/cookiejar"
	"os"
	"sync"
	"time"

	_ "git.nils.zone/nils/prettify"
)

const (
	iso8601       = "2006-01-02T15:04:05-0700"
	fetchInterval = 1 * time.Minute
)

// flags
var (
	lastFetchTime time.Time
	cacheMutex    sync.Mutex
	cacheNodes    []node
	cacheLinks    []link
)
var configPath = flag.String("configPath", "config.json", "Path to config.json")
var version = "development"
var delay time.Duration = 60 * time.Second
var conf = loadconfig(*configPath)

func main() {
	log.Printf("starting version %s...\n", version)
	// parse all flags
	flag.Parse()

	// check if flags are set
	if *configPath == "" {
		log.Fatalln("Please specify path to config.json flag '-configPath'")
	}

	// start API processing (runs in a loop)
	go func() {
		if err := processAPIs(); err != nil {
			log.Fatalln("API processing failed, error is: ", err)
		}
		tick := time.Tick(delay)
		for range tick {
			if err := processAPIs(); err != nil {
				log.Fatalln("API processing failed, error is: ", err)
			}
		}
	}()
	// start webserver on Port 3000
	serveJSON()
}

func processAPIs() error {
	var nodes []node
	var links []link

	if conf.UISP.Enabled {
		log.Println("Processing UISP")
		//Process UISP RiFu Nodes
		uispNodes, uispLinks, err := processUISPRiFu()
		if err != nil {
			return err
		}
		//Process UISP Routers (like EDGE Router)
		uispRouters, err := processUISPRouter()
		if err != nil {
			return err
		}
		nodes = append(nodes, uispNodes...)
		nodes = append(nodes, uispRouters...)
		links = append(links, uispLinks...)
	}
	if len(conf.Unifi) > 0 {
		log.Println("Anazahl der Unifi Server:", len(conf.Unifi))
		for i := range conf.Unifi {
			if conf.Unifi[i].Enabled {
				log.Println("Processing Unifi-Server: ", conf.Unifi[i].Name)
				//Process Unifi Nodes
				unifiNodes, _, err := processUnifiAPI(i)
				if err != nil {
					return err
				}
				nodes = append(nodes, unifiNodes...)
			}
		}
	}
	if conf.Meshviewer.Enabled {
		log.Println("Processing Meshviewer")
		mvNodes, mvLinks := getMeshviewer()
		nodes = append(nodes, mvNodes...)
		links = append(links, mvLinks...)
	}
	if conf.Gateways.Enabled {
		log.Println("Processing Gateways")
		//Process Static Gateways from Json
		gwNodes := processGateways()
		nodes = append(nodes, gwNodes...)
	}
	// assemble final struct
	o := output{
		Timestamp: time.Now().Format(iso8601),
		Nodes:     nodes,
		Links:     links,
	}

	// create file output
	log.Println("writing json file")

	if err := o.writeToFile(); err != nil {
		log.Fatalln(err)
	}

	// we're done here
	log.Println("...done")
	return nil
}

func loadconfig(file string) config {
	var config config
	configFile, err := os.Open(file)
	if err != nil {
		log.Fatalln("Failed loding Config file: ", err)
	}
	jsonParse := json.NewDecoder(configFile)
	if err := jsonParse.Decode(&config); err != nil {
		log.Fatalln(err)
	}
	return config
}

// int to bool converter
func itob(i int) bool {
	return i == 1
}

// function to get file from meshviewer
func getFile(url string) []byte {
	resp, err := http.Get(url)
	if err != nil {
		log.Println("Error getting file from:", url)
	}
	data := resp.Body
	byteValue, _ := io.ReadAll(data)
	return byteValue
}

// get devices from devices file on webserver (config)
func getDevices(url string) devices {
	// get devices from JSON file
	jsonFile := getFile(url)
	// read file to bytes
	// variable for d
	var d devices
	// unmarshal to struct
	err := json.Unmarshal(jsonFile, &d)
	if err != nil {
		fmt.Println("can´t get devices file from " + url)
		log.Fatal(err)
	}
	return d
}

// check for MAC Adress in current Devices
func isRemoteMACpublished(mac string, devices []device) bool {
	for i := range devices {
		if devices[i].MAC == mac {
			return true
		}
	}
	return false
}

func serveJSON() {
	fs := http.FileServer(http.Dir("./output"))
	http.Handle("/", fs)

	log.Println("Listening on :3000...")
	err := http.ListenAndServe(":3000", nil)
	if err != nil {
		log.Fatalln(err)
	}
}

func httpClient() *http.Client {
	jar, err := cookiejar.New(nil)
	if err != nil {
		log.Fatal(err)
	}
	client := &http.Client{Jar: jar}
	return client
}