package main

import (
	"fmt"
	"net/http"
)

func writeError(w http.ResponseWriter, status int, err interface{}) {
	w.WriteHeader(status)
	fmt.Fprintln(w, err)
}

func CreateApiHandler(settings *TranslateSettings) func(w http.ResponseWriter, req *http.Request) {
	return func(w http.ResponseWriter, req *http.Request) {
		from := req.FormValue("from")
		if from == "" {
			writeError(w, 400, "'from' field is missing")
			return
		}
		to := req.FormValue("to")
		if to == "" {
			writeError(w, 400, "'to' field is missing")
			return
		}
		text := req.FormValue("text")
		if text == "" {
			writeError(w, 400, "'text' field is missing")
			return
		}

		translation, err := Translate(settings, from, to, text)
		if err != nil {
			writeError(w, 500, err)
			return
		}

		fmt.Fprint(w, translation)
	}
}