package fasthttp

import (
	"io"

	"git.loafle.net/commons_go/rpc"
	"git.loafle.net/commons_go/rpc/protocol"
	cwf "git.loafle.net/commons_go/websocket_fasthttp"
	"git.loafle.net/commons_go/websocket_fasthttp/websocket"
)

func New() rpc.ServletReadWriteCloseHandler {
	return &ServletReadWriteCloseHandlers{}
}

type ServletReadWriteCloseHandlers struct {
	rpc.ServletReadWriteCloseHandlers
}

func (srwch *ServletReadWriteCloseHandlers) ReadRequest(servletCTX rpc.ServletContext, codec protocol.ServerCodec, conn interface{}) (protocol.ServerRequestCodec, error) {
	soc := conn.(cwf.Socket)

	_, r, err := soc.NextReader()
	if nil != err {
		if websocket.IsUnexpectedCloseError(err) {
			return nil, io.EOF
		}
		return nil, err
	}

	return codec.NewRequest(r)
}

func (srwch *ServletReadWriteCloseHandlers) WriteResponse(servletCTX rpc.ServletContext, conn interface{}, requestCodec protocol.ServerRequestCodec, result interface{}, err error) error {
	var (
		wc   io.WriteCloser
		wErr error
	)
	soc := conn.(cwf.Socket)

	wc, wErr = soc.NextWriter(websocket.TextMessage)
	if nil != wErr {
		if websocket.IsUnexpectedCloseError(wErr) {
			return io.EOF
		}
		return wErr
	}

	defer func() {
		wc.Close()
	}()

	if nil != err {
		wErr = requestCodec.WriteError(wc, 500, err)
	} else {
		wErr = requestCodec.WriteResponse(wc, result)
	}

	return wErr
}

func (srwch *ServletReadWriteCloseHandlers) WriteNotification(servletCTX rpc.ServletContext, conn interface{}, codec protocol.ServerCodec, method string, params []interface{}) error {
	var (
		wc   io.WriteCloser
		wErr error
	)
	soc := conn.(cwf.Socket)

	wc, wErr = soc.NextWriter(websocket.TextMessage)
	if nil != wErr {
		if websocket.IsUnexpectedCloseError(wErr) {
			return io.EOF
		}
		return wErr
	}

	defer func() {
		wc.Close()
	}()

	wErr = codec.WriteNotification(wc, method, params)

	return wErr
}

func (srwch *ServletReadWriteCloseHandlers) Validate() {
	srwch.ServletReadWriteCloseHandlers.Validate()
}