package utils

import (
	"encoding/json"
	"net/http"

	"datarush/internal/gw/domain"
)

func RespondJSON(w http.ResponseWriter, statusCode int, data interface{}) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(statusCode)

	if data != nil {
		if err := json.NewEncoder(w).Encode(data); err != nil {
			http.Error(w, "internal server error", http.StatusInternalServerError)
		}
	}
}

func RespondError(w http.ResponseWriter, err error) {
	if appErr, ok := err.(*domain.AppError); ok {
		RespondJSON(w, appErr.StatusCode, domain.NewErrorResponse(appErr.Err, appErr.Message))
		return
	}

	RespondJSON(w, http.StatusInternalServerError, domain.NewErrorResponse(err, "internal server error"))
}

func DecodeJSON(r *http.Request, v interface{}) error {
	if err := json.NewDecoder(r.Body).Decode(v); err != nil {
		return domain.NewBadRequestError("invalid JSON body")
	}
	return nil
}