package main

import (
	"crypto/rsa"
	"fmt"
	"net/http"
	"net/url"
	"os"

	"github.com/RichardKnop/machinery/v1"
	"github.com/RichardKnop/machinery/v1/config"
	"github.com/go-redis/redis"
	"github.com/yukimochi/Activity-Relay/ActivityPub"
	"github.com/yukimochi/Activity-Relay/KeyLoader"
	"github.com/yukimochi/Activity-Relay/State"
)

// Actor : Relay's Actor
var Actor activitypub.Actor

// WebfingerResource : Relay's Webfinger resource
var WebfingerResource activitypub.WebfingerResource

var hostURL *url.URL
var hostPrivatekey *rsa.PrivateKey
var redisClient *redis.Client
var machineryServer *machinery.Server
var relayState state.RelayState

func main() {
	pemPath := os.Getenv("ACTOR_PEM")
	if pemPath == "" {
		panic("Require ACTOR_PEM environment variable.")
	}
	relayDomain := os.Getenv("RELAY_DOMAIN")
	if relayDomain == "" {
		panic("Require RELAY_DOMAIN environment variable.")
	}
	relayBind := os.Getenv("RELAY_BIND")
	if relayBind == "" {
		relayBind = "0.0.0.0:8080"
	}
	redisURL := os.Getenv("REDIS_URL")
	if redisURL == "" {
		redisURL = "127.0.0.1:6379"
	}

	var err error
	hostPrivatekey, err = keyloader.ReadPrivateKeyRSAfromPath(pemPath)
	if err != nil {
		panic("Can't read Hostkey Pemfile")
	}
	hostURL, err = url.Parse("https://" + relayDomain)
	if err != nil {
		panic("Can't parse Relay Domain")
	}
	redisClient = redis.NewClient(&redis.Options{
		Addr: redisURL,
	})

	var macConfig = &config.Config{
		Broker:          "redis://" + redisURL,
		DefaultQueue:    "relay",
		ResultBackend:   "redis://" + redisURL,
		ResultsExpireIn: 5,
	}

	machineryServer, err = machinery.NewServer(macConfig)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
	}

	Actor.GenerateSelfKey(hostURL, &hostPrivatekey.PublicKey)
	WebfingerResource.GenerateFromActor(hostURL, &Actor)

	// Load Config
	relayState = state.NewState(redisClient)

	http.HandleFunc("/.well-known/webfinger", handleWebfinger)
	http.HandleFunc("/actor", handleActor)
	http.HandleFunc("/inbox", func(w http.ResponseWriter, r *http.Request) {
		handleInbox(w, r, decodeActivity)
	})

	fmt.Println("Welcome to YUKIMOCHI Activity-Relay [Server]\n - Configrations")
	fmt.Println("RELAY DOMAIN : ", relayDomain)
	fmt.Println("REDIS URL : ", redisURL)
	fmt.Println("BIND ADDRESS : ", relayBind)
	fmt.Println(" - Blocked Domain")
	domains, _ := redisClient.HKeys("relay:config:blockedDomain").Result()
	for _, domain := range domains {
		fmt.Println(domain)
	}
	fmt.Println(" - Limited Domain")
	domains, _ = redisClient.HKeys("relay:config:limitedDomain").Result()
	for _, domain := range domains {
		fmt.Println(domain)
	}
	http.ListenAndServe(relayBind, nil)
}