package main

import (
	"fmt"
	"net/http"
)

func writeError(w http.ResponseWriter, status int, err interface{}) {
	w.WriteHeader(status)
	w.Write([]byte(fmt.Sprintln(err)))
}

func ApiHandler(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(from, to, text)
	if err != nil {
		writeError(w, 500, err)
	}

	w.Write([]byte(translation))
}