package overflow_gateway_websocket

import (
	"log"

	"git.loafle.net/overflow/overflow_gateway_websocket/clients"
	"git.loafle.net/overflow/overflow_gateway_websocket/websocket"
	"github.com/valyala/fasthttp"
)

type ()

type Server interface {
	ListenAndServe(addr string) error
	HandleClient(pattern string, o *clients.Options)
}

type server struct {
	_option   *Options
	_upgrader *websocket.Upgrader
	_handlers map[string]*clients.Options
	_clients  map[string]clients.Client
}

func NewServer(o *Options) Server {
	s := &server{
		_option:   o.Validate(),
		_handlers: make(map[string]*clients.Options, 1),
		_clients:  make(map[string]clients.Client, 100),
	}

	s._upgrader = &websocket.Upgrader{
		ReadBufferSize:   s._option.ReadBufferSize,
		WriteBufferSize:  s._option.WriteBufferSize,
		HandshakeTimeout: s._option.HandshakeTimeout,
	}

	return s
}

func (s *server) onPush(cb OnPushFunc) {

}

func (s *server) onDisconnected(c clients.Client) {
	delete(s._clients, c.ID())

	s._option.OnDisconnected(c)
}

func (s *server) onConnection(ctx *fasthttp.RequestCtx) {
	s._upgrader.Upgrade(ctx, nil, func(conn *websocket.Conn, err error) {
		if err != nil {
			log.Print("upgrade:", err)
			return
		}
		path := string(ctx.Path())
		co, ok := s._handlers[path]
		if !ok {
			log.Printf("Path[%s] is not exist.", path)
			return
		}

		cid := s._option.IDGenerator(ctx)
		c := clients.New(cid, co, ctx, conn)
		s._clients[cid] = c
		s._option.OnConnection(path, c)
	})
}

func (s *server) HandleClient(pattern string, o *clients.Options) {
	s._handlers[pattern] = o.Validate()
}

func (s *server) ListenAndServe(addr string) error {
	return fasthttp.ListenAndServe(addr, s.onConnection)
}