package router

import (
	"context"
	"encoding/json"
	"github.com/gin-gonic/gin"
	ws "github.com/gorilla/websocket"
	"github.com/pterodactyl/wings/router/websocket"
)

// Upgrades a connection to a websocket and passes events along between.
func getServerWebsocket(c *gin.Context) {
	s := GetServer(c.Param("server"))
	handler, err := websocket.GetHandler(s, c.Writer, c.Request)
	if err != nil {
		TrackedServerError(err, s).AbortWithServerError(c)
		return
	}
	defer handler.Connection.Close()

	// Create a context that can be canceled when the user disconnects from this
	// socket that will also cancel listeners running in separate threads.
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	go handler.ListenForServerEvents(ctx)
	go handler.ListenForExpiration(ctx)

	for {
		j := websocket.Message{}

		_, p, err := handler.Connection.ReadMessage()
		if err != nil {
			if !ws.IsCloseError(
				err,
				ws.CloseNormalClosure,
				ws.CloseGoingAway,
				ws.CloseNoStatusReceived,
				ws.CloseServiceRestart,
				ws.CloseAbnormalClosure,
			) {
				s.Log().WithField("error", err).Warn("error handling websocket message for server")
			}
			break
		}

		// Discard and JSON parse errors into the void and don't continue processing this
		// specific socket request. If we did a break here the client would get disconnected
		// from the socket, which is NOT what we want to do.
		if err := json.Unmarshal(p, &j); err != nil {
			continue
		}

		if err := handler.HandleInbound(j); err != nil {
			handler.SendErrorJson(j, err)
		}
	}
}