package main

import (
	"fmt"
	"net/http"

	"git.phc.dm.unipi.it/aziis98/posti-dm/server/auth"
	"git.phc.dm.unipi.it/aziis98/posti-dm/server/db"
	"git.phc.dm.unipi.it/aziis98/posti-dm/server/httputil"
	"git.phc.dm.unipi.it/aziis98/posti-dm/server/httputil/serverevents"
	"git.phc.dm.unipi.it/aziis98/posti-dm/server/util"
	"github.com/alecthomas/repr"
	"github.com/go-chi/chi/v5"
)

type Server struct {
	authService *auth.AuthService

	roomServerEventStreams map[string]serverevents.Handler

	Database db.Store
	ApiRoute chi.Router
}

func NewServer() *Server {
	sessions := make(map[string]*db.User)
	database := db.NewInMemoryStore()

	server := &Server{
		Database: database,
		authService: &auth.AuthService{
			CheckUserPassword: func(userID, password string) error {
				if password != "phc" {
					return fmt.Errorf(`invalid password`)
				}

				// FIXME: al momento quando la password è giusta creiamo tutti gli account necessari
				database.CreateUser(&db.User{
					ID:          userID,
					Permissions: []string{},
				})

				return nil
			},
			UserPermissions: func(userID string) ([]string, error) {
				user, err := database.GetUser(userID)
				if err != nil {
					return nil, err
				}

				return user.Permissions, nil
			},
			SessionTokenFromUser: func(userID string) (string, error) {
				user, err := database.GetUser(userID)
				if err != nil {
					return "", err
				}

				token := util.RandomHash(10)
				sessions[token] = user
				repr.Println("Sessions: ", sessions)

				return token, nil
			},
			UserFromSessionToken: func(session string) (string, error) {
				user, present := sessions[session]
				if !present {
					return "", auth.ErrNoUserForSession
				}

				return user.ID, nil
			},
			AuthenticationFailed: func(err error) http.Handler {
				return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
					http.Error(w, err.Error(), http.StatusUnauthorized)
				})
			},
			OtherError: func(err error) http.Handler {
				return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
					http.Error(w, err.Error(), http.StatusInternalServerError)
				})
			},
		},

		roomServerEventStreams: make(map[string]serverevents.Handler),

		ApiRoute: chi.NewRouter(),
	}

	roomIDs, _ := database.GetRooms()
	for _, roomID := range roomIDs {
		server.roomServerEventStreams[roomID] = serverevents.New(&serverevents.Config{
			Connected: func(client chan string) {
				server.ConnectedToRoom(roomID, client)
			},
		})
	}

	server.setupRoutes()

	return server
}

func (server *Server) setupRoutes() {
	api := server.ApiRoute
	database := server.Database

	// Authenticated Routes

	api.Post("/login", func(w http.ResponseWriter, r *http.Request) {
		var credentials struct {
			Username string `json:"username"`
			Password string `json:"password"`
		}

		if err := httputil.ReadJSON(r, &credentials); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		server.authService.Login(w, r, credentials.Username, credentials.Password)
	})

	api.With(server.authService.LoggedMiddleware()).
		Post("/logout", func(w http.ResponseWriter, r *http.Request) {
			server.authService.Logout(w)
		})

	api.Get("/user", func(w http.ResponseWriter, r *http.Request) {
		userID, err := server.authService.UserFromSession(r)
		if err != nil {
			httputil.WriteJSON(w, nil)
			return
		}

		user, err := database.GetUser(userID)
		if err != nil {
			http.Error(w, err.Error(), http.StatusNotFound)
		}

		httputil.WriteJSON(w, user)
	})

	api.Get("/room/seats", func(w http.ResponseWriter, r *http.Request) {
		roomID, ok := r.URL.Query()["id"]
		if !ok {
			http.Error(w, `missing room id`, http.StatusBadRequest)
		}

		room, err := database.GetRoom(roomID[0])
		if err != nil {
			http.Error(w, err.Error(), http.StatusNotFound)
			return
		}

		seats := []*db.Seat{}
		for _, seatID := range room.SeatIDs {
			seat, err := database.GetSeat(seatID)
			if err != nil {
				http.Error(w, err.Error(), http.StatusNotFound)
				return
			}

			seats = append(seats, seat)
		}

		httputil.WriteJSON(w, seats)
	})

	api.HandleFunc("/room_events", func(w http.ResponseWriter, r *http.Request) {
		roomID, ok := r.URL.Query()["id"]
		if !ok {
			http.Error(w, `missing room id`, http.StatusBadRequest)
			return
		}

		server.roomServerEventStreams[roomID[0]].ServeHTTP(w, r)
	})

	api.With(server.authService.LoggedMiddleware()).
		Post("/seat/occupy", func(w http.ResponseWriter, r *http.Request) {
			userID, err := server.authService.UserFromSession(r)
			if err != nil {
				http.Error(w, err.Error(), http.StatusUnauthorized)
				return
			}

			seatID, ok := r.URL.Query()["id"]
			if !ok {
				http.Error(w, `missing seat id`, http.StatusBadRequest)
				return
			}

			seat, err := database.GetSeat(seatID[0])
			if err != nil {
				http.Error(w, err.Error(), http.StatusNotFound)
				return
			}

			repr.Println(userID, seatID)

			if err := database.OccupySeat(seatID[0], userID); err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}

			server.roomServerEventStreams[seat.RoomID].Broadcast("refresh")
			httputil.WriteJSON(w, "ok")
		})
	api.With(server.authService.LoggedMiddleware()).
		Post("/seat/leave", func(w http.ResponseWriter, r *http.Request) {
			seatID, ok := r.URL.Query()["id"]
			if !ok {
				http.Error(w, `missing seat id`, http.StatusBadRequest)
				return
			}

			seat, err := database.GetSeat(seatID[0])
			if err != nil {
				http.Error(w, err.Error(), http.StatusNotFound)
				return
			}

			if err := database.FreeSeat(seatID[0]); err != nil {
				http.Error(w, err.Error(), http.StatusInternalServerError)
				return
			}

			server.roomServerEventStreams[seat.RoomID].Broadcast("refresh")
			httputil.WriteJSON(w, "ok")
		})
}

func (server *Server) ConnectedToRoom(roomID string, client chan string) {
	// go func() {
	// 	for {
	// 		client <- "hi from server!"
	// 		time.Sleep(1 * time.Second)
	// 	}
	// }()
}