package http

import (
	"net/http"
	"strconv"
)

func ExtractLimitOffset(r *http.Request) (int, int, ResponseErrReadyToSend) {
	limit, offset := r.URL.Query().Get("limit"), r.URL.Query().Get("offset")

	if limit == "" {
		limit = "20"
	}

	if offset == "" {
		offset = "0"
	}

	limitInt, err := strconv.Atoi(limit)
	if err != nil {
		writeErr := NewResponseErrBuilder().
			WithMessage("Incorrect limit parameter").
			WithDetails(map[string]interface{}{
				"err": err.Error(),
			}).
			WithStatusCode(http.StatusBadRequest).
			Ready()

		return 0, 0, writeErr
	}

	offsetInt, err := strconv.Atoi(offset)
	if err != nil {
		writeErr := NewResponseErrBuilder().
			WithMessage("Incorrect offset parameter").
			WithDetails(map[string]interface{}{
				"err": err.Error(),
			}).
			WithStatusCode(http.StatusBadRequest).
			Ready()

		return 0, 0, writeErr
	}

	return limitInt, offsetInt, nil
}