package httpio

import (
	"encoding/json"
	"errors"
	"io"
	"log"
	"net/http"
)

type IRequestIO interface {
	// Validates the received request.
	Validate() *HTTPError
}

// Parses request body into the provided struct.
// Throws an error if the body could not be parsed.
func ParseRequestBody[T IRequestIO](r *http.Request) (*T, error) {
	requestBytes, err := io.ReadAll(r.Body)
	if err != nil {
		log.Println(err.Error())
		return nil, err
	}

	if !json.Valid(requestBytes) {
		return nil, errors.New("invalid JSON format")
	}

	var req T
	err = json.Unmarshal(requestBytes, &req)
	if err != nil {
		log.Println(err.Error())
		return nil, err
	}

	return &req, nil

}