package overflow_gateway_websocket

import (
	"time"

	"git.loafle.net/overflow/overflow_gateway_websocket/clients"
	uuid "github.com/satori/go.uuid"
	"github.com/valyala/fasthttp"
)

type (
	OnConnectionFunc   func(path string, c clients.Client)
	OnDisconnectedFunc func(c clients.Client)
	OnPushFunc         func()
	OnErrorFunc        func(ctx *fasthttp.RequestCtx, status int, reason error)
	OnCheckOriginFunc  func(ctx *fasthttp.RequestCtx) bool
	IDGeneratorFunc    func(ctx *fasthttp.RequestCtx) string
)

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
)

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

// Options is configuration of the websocket server
type Options struct {
	OnConnection   OnConnectionFunc
	OnDisconnected OnDisconnectedFunc
	OnCheckOrigin  OnCheckOriginFunc
	OnError        OnErrorFunc
	IDGenerator    IDGeneratorFunc

	ReadBufferSize   int
	WriteBufferSize  int
	HandshakeTimeout time.Duration
}

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

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

	if o.OnConnection == nil {
		o.OnConnection = func(path string, c clients.Client) {
		}
	}

	if o.OnDisconnected == nil {
		o.OnDisconnected = func(c clients.Client) {
		}
	}

	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
}