package main

import (
	"fmt"
	"net/http"
)

func postjson(f http.HandlerFunc) http.HandlerFunc {
	return contentJSON(methodPost(f))
}

func methodPost(f http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, req *http.Request) {
		if req.Method != http.MethodPost {
			w.WriteHeader(http.StatusMethodNotAllowed)
			fmt.Fprintf(w, `{"errors": ["method not allowed"]}`)
			return
		}

		f(w, req)
	}

}

func contentJSON(f http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, req *http.Request) {
		headers := w.Header()
		headers.Set("content-type", "application/json")

		f(w, req)
	}
}

type noopHandler struct {
	http.HandlerFunc
}

func wrapHandleFunc(h http.HandlerFunc) noopHandler {
	return noopHandler{
		HandlerFunc: h,
	}
}

func (h noopHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	h.HandlerFunc(w, req)
}