package overflow_gateway_websocket

import (
	"time"

	uuid "github.com/satori/go.uuid"
	"github.com/valyala/fasthttp"
)

type (
	OnConnectionFunc   func(soc Socket)
	OnDisconnectedFunc func(soc Socket)
	OnCheckOriginFunc  func(ctx *fasthttp.RequestCtx) bool
)

const (
	// DefaultHandshakeTimeout is default value of websocket handshake Timeout
	DefaultHandshakeTimeout = 0
	// DefaultReadBufferSize is default value of Read Buffer Size
	DefaultReadBufferSize = 4096
	// DefaultWriteBufferSize is default value of Write Buffer Size
	DefaultWriteBufferSize = 4096
	// DefaultEnableCompression is default value of support compression
	DefaultEnableCompression = false
)

var (
	// DefaultIDGenerator returns the UUID of the client
	DefaultIDGenerator = func(ctx *fasthttp.RequestCtx) string { return uuid.NewV4().String() }
)

// ServerOptions is configuration of the websocket server
type ServerOptions struct {
	OnConnection   OnConnectionFunc
	OnDisconnected OnDisconnectedFunc
	OnCheckOrigin  OnCheckOriginFunc
	OnError        func(ctx *fasthttp.RequestCtx, status int, reason error)
	IDGenerator    func(ctx *fasthttp.RequestCtx) string

	HandshakeTimeout  time.Duration
	ReadBufferSize    int
	WriteBufferSize   int
	EnableCompression bool
}

// Validate validates the configuration
func (o *ServerOptions) Validate() *ServerOptions {
	if o.ReadBufferSize <= 0 {
		o.ReadBufferSize = DefaultReadBufferSize
	}

	if o.WriteBufferSize <= 0 {
		o.WriteBufferSize = DefaultWriteBufferSize
	}

	if o.OnConnection == nil {
		o.OnConnection = func(soc Socket) {
		}
	}

	if o.OnDisconnected == nil {
		o.OnDisconnected = func(soc Socket) {
		}
	}

	if o.OnError == nil {
		o.OnError = func(ctx *fasthttp.RequestCtx, status int, reason error) {
		}
	}

	if o.OnCheckOrigin == nil {
		o.OnCheckOrigin = func(ctx *fasthttp.RequestCtx) bool {
			return true
		}
	}

	if o.IDGenerator == nil {
		o.IDGenerator = DefaultIDGenerator
	}

	return o
}