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package main

import (
	"encoding/gob"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"sync"
)

var mu sync.Mutex
var bindAddr string
var me string
var initialPeer string
var dataDir string

type LoggingHandler struct {
	Handler http.Handler
}

// Log all HTTP requests
func (lh LoggingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	log.Printf("Request: %s %s%s", r.Method, me, r.URL.String())
	lh.Handler.ServeHTTP(w, r)
}

func main() {
	flag.StringVar(&bindAddr, "b", ":4200", "bind address")
	flag.StringVar(&me, "u", "http://localhost:4200", "public URL")
	flag.StringVar(&initialPeer, "i", "", "initial peer")
	flag.StringVar(&dataDir, "d", ".", "data directory")
	flag.Parse()
	log.Printf("Starting %s %s %s %s", bindAddr, me, initialPeer, dataDir)

	// Record myself
	myHash = sha256sum(me)
	myPos = 0
	peerHashes = append(peerHashes, sha256sum(me))
	hashToDomain = map[string]string{peerHashes[0]: me}
	kvstore = make(map[string][]byte)
	users = make(map[string]*user)

	// Load user data from disk
	os.Mkdir(dataDir, 0755)
	entries, err := os.ReadDir(dataDir)
	if err != nil {
		log.Fatal(err)
	}
	for _, entry := range entries {
		id := entry.Name()
		reader, err := os.Open(dataDir + "/" + id + "/gob")
		if err != nil {
			log.Fatal(err)
			continue
		}
		var user *user
		dec := gob.NewDecoder(reader)
		dec.Decode(user)
		users[id] = user
	}

	// Start background functions
	if initialPeer != "" {
		go addPeer(initialPeer)
	}
	go cleanPeers()
	go cleanKVStore()
	go redistributeKeys()

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintf(w, "Hello! This is a Kela server.")
	})
	http.HandleFunc("/peer", peerHandler)
	http.HandleFunc("/user/", userHandler)
	http.HandleFunc("/dht/", dhtHandler)
	http.HandleFunc("/storage/", storageHandler)
	http.HandleFunc("/message/", messageHandler)
	log.Fatal(http.ListenAndServe(bindAddr, LoggingHandler{Handler: http.DefaultServeMux}))
}