package fasthttp

import (
	"fmt"
	"io"
	"strings"

	"git.loafle.net/commons_go/rpc"
	"github.com/valyala/fasthttp"
)

type FastHTTPAdapter struct {
	registry rpc.Registry
}

// FastHTTPHandler
func (a *FastHTTPAdapter) FastHTTPHandler(ctx *fasthttp.RequestCtx) {
	if !ctx.IsPost() {
		WriteError(ctx, 405, "rpc: POST method required, received "+r.Method)
		return
	}

	contentType := string(ctx.Request.Header.ContentType())
	idx := strings.Index(contentType, ";")
	if idx != -1 {
		contentType = contentType[:idx]
	}

	err := a.registry.Invoke(contentType, ctx.PostBody(), ctx, beforeWrite, afterWrite)

	if nil != err {
		WriteError(w, 400, err.Error())
	}

}

func beforeWrite(w io.Writer) {
	ctx := w.(*fasthttp.RequestCtx)
	ctx.Response.Header.Set("x-content-type-options", "nosniff")
	ctx.SetContentType("application/json; charset=utf-8")
}

func afterWrite(w io.Writer) {

}

func writeError(ctx *fasthttp.RequestCtx, status int, msg string) {
	ctx.SetStatusCode(status)
	ctx.SetContentType("text/plain; charset=utf-8")
	fmt.Fprint(ctx, msg)
}