package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strconv"

	"github.com/FrankenBotDev/FrankenAPI/ent/authorizables"
	"github.com/FrankenBotDev/FrankenAPI/pkg/routes/actions"
	"github.com/FrankenBotDev/FrankenAPI/pkg/routes/logger"
	"github.com/FrankenBotDev/FrankenAPI/pkg/routes/punishments"
	"github.com/FrankenBotDev/FrankenAPI/pkg/security"
	"github.com/FrankenBotDev/FrankenAPI/pkg/routes/settings"
	"github.com/FrankenBotDev/FrankenAPI/pkg/routes/stats"
	"github.com/FrankenBotDev/FrankenAPI/pkg/routes/support"
	"github.com/FrankenBotDev/FrankenAPI/pkg/sys"
	"github.com/joho/godotenv"
	"gopkg.in/olahol/melody.v1"

	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/go-chi/cors"
	"github.com/go-chi/jwtauth/v5"
	_ "github.com/jackc/pgx/v4/stdlib"
)

type LoginRequest struct {
	Username string `json:username`
	Password string `json:password`
}

type GopherInfo struct {
	ID, USERID, CH string
}

type Message struct {
	Command string
	Payload map[string]string
}

func main() {
	mrouter := melody.New()
	gophers := make(map[*melody.Session]*GopherInfo)
	counter := 0
	err := godotenv.Load(".env")
	if err != nil {
		fmt.Println(".end could not be loaded")
		log.Fatal(err)
	}
	client, cContext := sys.InitDB()
	tokenAuth := jwtauth.New("HS256", []byte("secret"), nil)
	defer client.Close()

	r := chi.NewRouter()
	r.Use(middleware.Logger)

	// Basic CORS
	// for more ideas, see: https://developer.github.com/v3/#cross-origin-resource-sharing
	r.Use(cors.Handler(cors.Options{
		// AllowedOrigins:   []string{"https://foo.com"}, // Use this to allow specific origin hosts
		AllowedOrigins: []string{"https://*", "http://*"},
		// AllowOriginFunc:  func(r *http.Request, origin string) bool { return true },
		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		ExposedHeaders:   []string{"Link"},
		AllowCredentials: false,
		MaxAge:           300, // Maximum value not ignored by any of major browsers
	}))

	r.Use(func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			ctx := context.WithValue(r.Context(), sys.EntClientKey, client)
			next.ServeHTTP(w, r.WithContext(ctx))
		})
	})

	r.Use(func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			ctx := context.WithValue(r.Context(), sys.ContextClientKey, cContext)
			next.ServeHTTP(w, r.WithContext(ctx))
		})
	})

	// Witout JWT
	r.Group(func(r chi.Router) {
		// AUTHENTIFICATION ROUTER
		// using loging and password from a user to authenticate
		// Returns bearer if login is succefful and error if not
		r.Post("/server/auth", func(w http.ResponseWriter, r *http.Request) {

			var loginRequest LoginRequest
			err := json.NewDecoder(r.Body).Decode(&loginRequest)
			if err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}

			// Queries requested data
			user, err := client.Authorizables.Query().
				Where(authorizables.Username(loginRequest.Username), authorizables.Password(security.NewSHA256asString([]byte(loginRequest.Password)))).
				All(cContext)
			if err != nil {
				http.Error(w, "database error", http.StatusInternalServerError)
			}

			// Validates user entry if one is present login can proceed
			if len(user) == 1 {
				_, tokenString, err := tokenAuth.Encode(map[string]interface{}{"user_id": 1})
				if err != nil {
					sys.ErrorJsonResponse(w, "encoding_error", err)
				}

				raw, _ := json.Marshal(`{"type":"success", "token":"` + tokenString + `"}`)

				w.Write(raw)
				return
			} else {

				http.Error(w, `{"type":"error", "code":"invalid credentials"}`, http.StatusUnauthorized)
				return
			}

		})
	})

	// With JWT
	r.Group(func(r chi.Router) {

		r.Use(jwtauth.Verifier(tokenAuth))
		r.Use(jwtauth.Authenticator)

		r.Mount("/logger", logger.LogRouter())
		r.Mount("/server/punishments", punishments.PunRouter())
		r.Mount("/server/settings", settings.SettingsRouter())
		r.Mount("/server/actions", actions.ActionRouter())
		r.Mount("/server/support", support.SupportRouter())
		r.Mount("/stats", stats.StatsRouter())
	})

	/* ==================================================
	WEBSOCKET CODE
	================================================== */
	// Websocket Endpoint
	r.Get("/ws", func(w http.ResponseWriter, r *http.Request) {
		fmt.Println("websocket connection")
		mrouter.HandleRequest(w, r)
	})

	// Connect Socket
	mrouter.HandleConnect(func(s *melody.Session) {
		fmt.Println("websocket connecting")

		// Receives data and assignes it to the gophers map
		gophers[s] = &GopherInfo{strconv.Itoa(counter), s.Request.URL.Query().Get("userid"), s.Request.URL.Query().Get("channel")}

		// Message user client about Successfull Connection and tell the User
		//s.Write([]byte(`{"type":"success", "id":` + gophers[s].ID + `}`))
		s.Write([]byte(`{"comamnd":"msg", "payload":{"name":"SYSTEM", "userid":"system", "type":"INFO", "msg":"You are connected to:` + s.Request.URL.Query().Get("channel") + `"} }`))
		counter += 1
	})

	// handle message and send to correct channel after session as created for user
	mrouter.HandleMessage(func(s *melody.Session, msg []byte) {
		info := gophers[s]
		commandJson := Message{}
		json.Unmarshal(msg, &commandJson)

		// Command Handler
		switch commandJson.Command {
		case "msg":
			raw, err := json.Marshal(`{"command":"msg", "payload":{"name":"` + commandJson.Payload["name"] + `", "userid":"` + commandJson.Payload["userid"] + `", "type":"default", "msg":"` + commandJson.Payload["msg"] + `"} }`)
			if err != nil {
				fmt.Println(err)
			}

			mrouter.BroadcastFilter(raw, func(q *melody.Session) bool {
				// log messages here
				return info.CH == q.Request.URL.Query().Get("channel")
			})
		}
	})

	// Deletes socket out of known Map
	mrouter.HandleDisconnect(func(s *melody.Session) {
		tCH := gophers[s].CH

		// Sends a message to the channel that a user left
		mrouter.BroadcastFilter([]byte(gophers[s].USERID+"left the channel"), func(q *melody.Session) bool {
			// log messages here
			return gophers[s].CH == tCH
		})

		// Deletes a user from the internal client map
		delete(gophers, s)
	})

	fmt.Println("API Online on 0.0.0.0:3000")
	http.ListenAndServe("0.0.0.0:3000", r)
}