package core

import (
	"git.noahlan.cn/northlan/nnet/internal/env"
	"git.noahlan.cn/northlan/nnet/log"
	"git.noahlan.cn/northlan/nnet/packet"
	"git.noahlan.cn/northlan/nnet/serialize"
	"net/http"
	"time"
)

type (
	// RunOption defines the method to customize a Server.
	RunOption func(*Server)

	Server struct {
		ngin   *engine
		router Router
	}
)

// NewServer returns a server with given config of c and options defined in opts.
// Be aware that later RunOption might overwrite previous one that write the same option.
func NewServer(c EngineConf, opts ...RunOption) *Server {
	s := &Server{
		ngin:   newEngine(c),
		router: NewRouter(),
	}

	opts = append([]RunOption{WithNotFoundHandler(nil)}, opts...)
	for _, opt := range opts {
		opt(s)
	}

	return s
}

// AddRoutes add given routes into the Server.
func (s *Server) AddRoutes(rs []Route) {
	s.ngin.addRoutes(rs...)
}

// AddRoute adds given route into the Server.
func (s *Server) AddRoute(r Route) {
	s.AddRoutes([]Route{r})
}

// Start starts the Server.
// Graceful shutdown is enabled by default.
func (s *Server) Start() {
	if err := s.ngin.serve(s.router); err != nil {
		log.Error(err)
		panic(err)
	}
}

// Stop stops the Server.
func (s *Server) Stop() {
	s.ngin.close()
}

// Use adds the given middleware in the Server.
func (s *Server) Use(middleware Middleware) {
	s.ngin.use(middleware)
}

// ToMiddleware converts the given handler to a Middleware.
func ToMiddleware(handler func(next Handler) Handler) Middleware {
	return func(next HandlerFunc) HandlerFunc {
		return handler(next).Handle
	}
}

// WithMiddlewares adds given middlewares to given routes.
func WithMiddlewares(ms []Middleware, rs ...Route) []Route {
	for i := len(ms) - 1; i >= 0; i-- {
		rs = WithMiddleware(ms[i], rs...)
	}
	return rs
}

// WithMiddleware adds given middleware to given route.
func WithMiddleware(middleware Middleware, rs ...Route) []Route {
	routes := make([]Route, len(rs))

	for i := range rs {
		route := rs[i]
		routes[i] = Route{
			Matches: route.Matches,
			Handler: middleware(route.Handler),
		}
	}
	return routes
}

// WithNotFoundHandler returns a RunOption with not found handler set to given handler.
func WithNotFoundHandler(handler Handler) RunOption {
	return func(server *Server) {
		notFoundHandler := server.ngin.notFoundHandler(handler)
		server.router.SetNotFoundHandler(notFoundHandler)
	}
}

func WithRouter(router Router) RunOption {
	return func(server *Server) {
		server.router = router
	}
}

func WithPacker(packer packet.Packer) RunOption {
	return func(server *Server) {
		server.ngin.packer = packer
	}
}

func WithProcessor(p Processor) RunOption {
	return func(server *Server) {
		server.ngin.processor = p
	}
}

func WithSerializer(s serialize.Serializer) RunOption {
	return func(server *Server) {
		server.ngin.serializer = s
	}
}

func WithLogger(logger log.Logger) RunOption {
	return func(_ *Server) {
		log.SetLogger(logger)
	}
}

// WithTimerPrecision 设置Timer精度
// 注：精度需大于1ms, 并且不能在运行时更改
// 默认精度是 time.Second
func WithTimerPrecision(precision time.Duration) RunOption {
	if precision < time.Millisecond {
		panic("time precision can not less than a Millisecond")
	}
	return func(_ *Server) {
		env.TimerPrecision = precision
	}
}

func WithPipeline(pipeline Pipeline) RunOption {
	return func(server *Server) {
		server.ngin.pipeline = pipeline
	}
}

func WithHeartbeatInterval(d time.Duration) RunOption {
	return func(server *Server) {
		server.ngin.heartbeatInterval = d
	}
}

type WSOption func(opts *wsOptions)

// WithWebsocket 开启Websocket, 参数是websocket的相关参数 nnet.WSOption
func WithWebsocket(wsOpts ...WSOption) RunOption {
	return func(server *Server) {
		for _, opt := range wsOpts {
			opt(&server.ngin.wsOpt)
		}
		server.ngin.wsOpt.IsWebsocket = true
	}
}

// WithWSPath 设置websocket的path
func WithWSPath(path string) WSOption {
	return func(opts *wsOptions) {
		opts.WebsocketPath = path
	}
}

// WithWSTLSConfig 设置websocket的证书和密钥
func WithWSTLSConfig(certificate, key string) WSOption {
	return func(opts *wsOptions) {
		opts.TLSCertificate = certificate
		opts.TLSKey = key
	}
}

func WithWSCheckOriginFunc(fn func(*http.Request) bool) WSOption {
	return func(opts *wsOptions) {
		if fn != nil {
			opts.CheckOrigin = fn
		}
	}
}