package handler

import (
	"dal-license-server/internal/model"
	"dal-license-server/internal/service"
	"encoding/json"
	"net/http"
)

func writeJSON(w http.ResponseWriter, status int, data interface{}) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	json.NewEncoder(w).Encode(data)
}

func writeError(w http.ResponseWriter, status int, code, message string) {
	writeJSON(w, status, model.ErrorResponse{
		Error: model.ErrorDetail{Code: code, Message: message},
	})
}

func writeLicenseError(w http.ResponseWriter, err error) {
	if le, ok := err.(*service.LicenseError); ok {
		resp := model.ErrorResponse{
			Error: model.ErrorDetail{Code: le.Code, Message: le.Message, Details: le.Details},
		}
		writeJSON(w, http.StatusBadRequest, resp)
		return
	}
	writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "Interna greska servera")
}

func clientIP(r *http.Request) string {
	if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
		return xff
	}
	if xri := r.Header.Get("X-Real-IP"); xri != "" {
		return xri
	}
	return r.RemoteAddr
}