package main

import (
	"context"
	"encoding/json"
	"github.com/gorilla/websocket"
	log "maunium.net/go/maulogger/v2"
	"net/http"

	"maunium.net/go/mautrix/id"
)

type ProvisioningAPI struct {
	bridge *Bridge
	log    log.Logger
}

func (prov *ProvisioningAPI) Init() {
	prov.log = prov.bridge.Log.Sub("Provisioning")
	prov.log.Debugln("Enabling provisioning API at", prov.bridge.Config.AppService.Provisioning.Prefix)
	r := prov.bridge.AS.Router.PathPrefix(prov.bridge.Config.AppService.Provisioning.Prefix).Subrouter()
	r.Use(prov.AuthMiddleware)
	r.HandleFunc("/ping", prov.Ping).Methods(http.MethodGet)
	r.HandleFunc("/login", prov.Login)
	r.HandleFunc("/logout", prov.Logout).Methods(http.MethodPost)
	r.HandleFunc("/delete_session", prov.DeleteSession).Methods(http.MethodPost)
	r.HandleFunc("/delete_connection", prov.DeleteConnection).Methods(http.MethodPost)
	r.HandleFunc("/disconnect", prov.Disconnect).Methods(http.MethodPost)
	r.HandleFunc("/reconnect", prov.Reconnect).Methods(http.MethodPost)
}

func (prov *ProvisioningAPI) AuthMiddleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		auth := r.Header.Get("Authorization")
		auth = auth[len("Bearer "):]
		if auth != prov.bridge.Config.AppService.Provisioning.SharedSecret {
			jsonResponse(w, http.StatusForbidden, map[string]interface{}{
				"error":   "Invalid auth token",
				"errcode": "M_FORBIDDEN",
			})
			return
		}
		userID := r.URL.Query().Get("user_id")
		user := prov.bridge.GetUserByMXID(id.UserID(userID))
		h.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), "user", user)))
	})
}

type Error struct {
	Success bool   `json:"success"`
	Error   string `json:"error"`
	ErrCode string `json:"errcode"`
}

type Response struct {
	Success bool   `json:"success"`
	Status  string `json:"status"`
}

func (prov *ProvisioningAPI) DeleteSession(w http.ResponseWriter, r *http.Request) {
	user := r.Context().Value("user").(*User)
	if user.Session == nil && user.Conn == nil {
		jsonResponse(w, http.StatusNotFound, Error{
			Error:   "Nothing to purge: no session information stored and no active connection.",
			ErrCode: "no session",
		})
		return
	}
	user.SetSession(nil)
	if user.Conn != nil {
		//_, _ = user.Conn.Disconnect()
		user.Conn.RemoveHandlers()
		user.Conn = nil
	}
	jsonResponse(w, http.StatusOK, Response{true, "Session information purged"})
}

func (prov *ProvisioningAPI) DeleteConnection(w http.ResponseWriter, r *http.Request) {
	//user := r.Context().Value("user").(*User)
	//if user.Conn == nil {
	//	jsonResponse(w, http.StatusNotFound, Error{
	//		Error:   "You don't have a WhatsApp connection.",
	//		ErrCode: "not connected",
	//	})
	//	return
	//}
	//sess, err := user.Conn.Disconnect()
	//if err == nil && len(sess.Wid) > 0 {
	//	user.SetSession(&sess)
	//}
	//user.Conn.RemoveHandlers()
	//user.Conn = nil
	//jsonResponse(w, http.StatusOK, Response{true, "Disconnected from WhatsApp and connection deleted"})
}

func (prov *ProvisioningAPI) Disconnect(w http.ResponseWriter, r *http.Request) {
	//user := r.Context().Value("user").(*User)
	//if user.Conn == nil {
	//	jsonResponse(w, http.StatusNotFound, Error{
	//		Error:   "You don't have a WhatsApp connection.",
	//		ErrCode: "no connection",
	//	})
	//	return
	//}
	//sess, err := user.Conn.Disconnect()
	//if err == whatsapp.ErrNotConnected {
	//	jsonResponse(w, http.StatusNotFound, Error{
	//		Error:   "You were not connected",
	//		ErrCode: "not connected",
	//	})
	//	return
	//} else if err != nil {
	//	user.log.Warnln("Error while disconnecting:", err)
	//	jsonResponse(w, http.StatusInternalServerError, Error{
	//		Error:   fmt.Sprintf("Unknown error while disconnecting: %v", err),
	//		ErrCode: err.Error(),
	//	})
	//	return
	//} else if len(sess.Wid) > 0 {
	//	user.SetSession(&sess)
	//}
	//jsonResponse(w, http.StatusOK, Response{true, "Disconnected from WhatsApp"})
}

func (prov *ProvisioningAPI) Reconnect(w http.ResponseWriter, r *http.Request) {
	//user := r.Context().Value("user").(*User)
	//if user.Conn == nil {
	//	if user.Session == nil {
	//		jsonResponse(w, http.StatusForbidden, Error{
	//			Error:   "No existing connection and no session. Please log in first.",
	//			ErrCode: "no session",
	//		})
	//	} else {
	//		user.Connect(false)
	//		jsonResponse(w, http.StatusOK, Response{true, "Created connection to WhatsApp."})
	//	}
	//	return
	//}
	//
	//wasConnected := true
	//sess, err := user.Conn.Disconnect()
	//if err == whatsapp.ErrNotConnected {
	//	wasConnected = false
	//} else if err != nil {
	//	user.log.Warnln("Error while disconnecting:", err)
	//} else if len(sess.Wid) > 0 {
	//	user.SetSession(&sess)
	//}
	//
	//err = user.Conn.Restore()
	//if err == whatsapp.ErrInvalidSession {
	//	if user.Session != nil {
	//		user.log.Debugln("Got invalid session error when reconnecting, but user has session. Retrying using RestoreWithSession()...")
	//		var sess whatsapp.Session
	//		sess, err = user.Conn.RestoreWithSession(*user.Session)
	//		if err == nil {
	//			user.SetSession(&sess)
	//		}
	//	} else {
	//		jsonResponse(w, http.StatusForbidden, Error{
	//			Error:   "You're not logged in",
	//			ErrCode: "not logged in",
	//		})
	//		return
	//	}
	//} else if err == whatsapp.ErrLoginInProgress {
	//	jsonResponse(w, http.StatusConflict, Error{
	//		Error:   "A login or reconnection is already in progress.",
	//		ErrCode: "login in progress",
	//	})
	//	return
	//} else if err == whatsapp.ErrAlreadyLoggedIn {
	//	jsonResponse(w, http.StatusConflict, Error{
	//		Error:   "You were already connected.",
	//		ErrCode: err.Error(),
	//	})
	//	return
	//}
	//if err != nil {
	//	user.log.Warnln("Error while reconnecting:", err)
	//	if err.Error() == "restore session connection timed out" {
	//		jsonResponse(w, http.StatusForbidden, Error{
	//			Error:   "Reconnection timed out. Is WhatsApp on your phone reachable?",
	//			ErrCode: err.Error(),
	//		})
	//	} else {
	//		jsonResponse(w, http.StatusForbidden, Error{
	//			Error:   fmt.Sprintf("Unknown error while reconnecting: %v", err),
	//			ErrCode: err.Error(),
	//		})
	//	}
	//	user.log.Debugln("Disconnecting due to failed session restore in reconnect command...")
	//	sess, err := user.Conn.Disconnect()
	//	if err != nil {
	//		user.log.Errorln("Failed to disconnect after failed session restore in reconnect command:", err)
	//	} else if len(sess.Wid) > 0 {
	//		user.SetSession(&sess)
	//	}
	//	return
	//}
	//user.ConnectionErrors = 0
	//user.PostLogin()
	//
	//var msg string
	//if wasConnected {
	//	msg = "Reconnected successfully."
	//} else {
	//	msg = "Connected successfully."
	//}
	//
	//jsonResponse(w, http.StatusOK, Response{true, msg})
}

func (prov *ProvisioningAPI) Ping(w http.ResponseWriter, r *http.Request) {
	//user := r.Context().Value("user").(*User)
	//wa := map[string]interface{}{
	//	"has_session":     user.Session != nil,
	//	"management_room": user.ManagementRoom,
	//	"jid":             user.JID,
	//	"conn":            nil,
	//	"ping":            nil,
	//}
	//if user.Conn != nil {
	//	wa["conn"] = map[string]interface{}{
	//		"is_connected":         user.Conn.IsConnected(),
	//		"is_logged_in":         user.Conn.IsLoggedIn(),
	//		"is_login_in_progress": user.Conn.IsLoginInProgress(),
	//	}
	//	ok, err := user.Conn.AdminTest()
	//	wa["ping"] = map[string]interface{}{
	//		"ok":  ok,
	//		"err": err,
	//	}
	//}
	//resp := map[string]interface{}{
	//	"mxid":                 user.MXID,
	//	"admin":                user.Admin,
	//	"whitelisted":          user.Whitelisted,
	//	"relaybot_whitelisted": user.RelaybotWhitelisted,
	//	"whatsapp":             wa,
	//}
	//jsonResponse(w, http.StatusOK, resp)
}

func jsonResponse(w http.ResponseWriter, status int, response interface{}) {
	w.Header().Add("Content-Type", "application/json")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(response)
}

func (prov *ProvisioningAPI) Logout(w http.ResponseWriter, r *http.Request) {
	//user := r.Context().Value("user").(*User)
	//if user.Session == nil {
	//	jsonResponse(w, http.StatusNotFound, Error{
	//		Error:   "You're not logged in",
	//		ErrCode: "not logged in",
	//	})
	//	return
	//}
	//
	//err := user.Conn.Logout()
	//if err != nil {
	//	user.log.Warnln("Error while logging out:", err)
	//	jsonResponse(w, http.StatusInternalServerError, Error{
	//		Error:   fmt.Sprintf("Unknown error while logging out: %v", err),
	//		ErrCode: err.Error(),
	//	})
	//	return
	//}
	//_, err = user.Conn.Disconnect()
	//if err != nil {
	//	user.log.Warnln("Error while disconnecting after logout:", err)
	//}
	//user.Conn.RemoveHandlers()
	//user.Conn = nil
	//user.removeFromJIDMap()
	//// TODO this causes a foreign key violation, which should be fixed
	////ce.User.JID = ""
	//user.SetSession(nil)
	//jsonResponse(w, http.StatusOK, Response{true, "Logged out successfully."})
}

var upgrader = websocket.Upgrader{}

func (prov *ProvisioningAPI) Login(w http.ResponseWriter, r *http.Request) {
	//userID := r.URL.Query().Get("user_id")
	//user := prov.bridge.GetUserByMXID(id.UserID(userID))
	//
	//c, err := upgrader.Upgrade(w, r, nil)
	//if err != nil {
	//	prov.log.Errorfln("Failed to upgrade connection to websocket:", err)
	//	return
	//}
	//defer c.Close()
	//
	//if !user.Connect(true) {
	//	user.log.Debugln("Connect() returned false, assuming error was logged elsewhere and canceling login.")
	//	_ = c.WriteJSON(Error{
	//		Error:   "Failed to connect to WhatsApp",
	//		ErrCode: "connection error",
	//	})
	//	return
	//}
	//
	//qrChan := make(chan string, 3)
	//go func() {
	//	for code := range qrChan {
	//		if code == "stop" {
	//			return
	//		}
	//		_ = c.WriteJSON(map[string]interface{}{
	//			"code": code,
	//		})
	//	}
	//}()
	//session, err := user.Conn.LoginWithRetry(qrChan, user.bridge.Config.Bridge.LoginQRRegenCount)
	//qrChan <- "stop"
	//if err != nil {
	//	var msg string
	//	if err == whatsapp.ErrAlreadyLoggedIn {
	//		msg = "You're already logged in"
	//	} else if err == whatsapp.ErrLoginInProgress {
	//		msg = "You have a login in progress already."
	//	} else if err == whatsapp.ErrLoginTimedOut {
	//		msg = "QR code scan timed out. Please try again."
	//	} else {
	//		user.log.Warnln("Failed to log in:", err)
	//		msg = fmt.Sprintf("Unknown error while logging in: %v", err)
	//	}
	//	_ = c.WriteJSON(Error{
	//		Error:   msg,
	//		ErrCode: err.Error(),
	//	})
	//	return
	//}
	//user.ConnectionErrors = 0
	//user.JID = strings.Replace(user.Conn.Info.Wid, whatsappExt.OldUserSuffix, whatsappExt.NewUserSuffix, 1)
	//user.addToJIDMap()
	//user.SetSession(&session)
	//_ = c.WriteJSON(map[string]interface{}{
	//	"success": true,
	//	"jid":     user.JID,
	//})
	//user.PostLogin()
}