package handler

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
)

func ExtractFromRequest(r *http.Request, reqItem interface{}) error {
	err := json.NewDecoder(r.Body).Decode(&reqItem)
	if err != nil {
		return err
	} else {
		return nil
	}
}

func InvalidJson(err error) string {
	return fmt.Sprintf("Invalid JSON: %s", err.Error())
}

// Helper function to send JSON responses
// TODO: Change type of data to any
func RespondWithJSON(w http.ResponseWriter, statusCode int, data interface{}) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(statusCode)
	encoder := json.NewEncoder(w)
	if err := encoder.Encode(data); err != nil {
		log.Printf("Error encoding JSON: %v", err)
	}
}

// Gets the query parameter from the URL
func ParseQueryParams(r *http.Request, query string) (*string, error) {
	queryParams := r.URL.Query()
	if _, exists := queryParams[query]; exists {
		value := queryParams.Get(query)
		if len(value) == 0 {
			return nil, fmt.Errorf("Value of query parameter is empty")
		} else {
			return &value, nil
		}
	} else {
		return nil, fmt.Errorf("Could not find query %s", query)
	}
}