package openlibrary

import (
	"encoding/json"
	"net/http"
	"net/url"
	"strconv"
)

func computeOpenLibraryUrl(paths ...string) (*url.URL, error) {
	baseUrl := "https://openlibrary.org"
	u, err := url.Parse(baseUrl)
	if err != nil {
		return nil, err
	}
	for _, p := range paths {
		u = u.JoinPath(p)
	}
	return u, nil
}

func fetchAndParseResult[T any](u *url.URL, queryResult *T) error {
	resp, err := doOpenLibraryQuery(u)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	decoder := json.NewDecoder(resp.Body)
	err = decoder.Decode(queryResult)
	return err
}

func doOpenLibraryQuery(u *url.URL) (*http.Response, error) {
	client := &http.Client{}
	req, err := http.NewRequest("GET", u.String(), nil)
	if err != nil {
		return nil, err
	}
	req.Header.Add("Accept", "application/json")
	req.Header.Add("User-Agent", "PersonalLibraryManager/0.1 (artlef@protonmail.com)")
	return client.Do(req)
}

func addQueryParamInt(u *url.URL, paramName string, paramValue int) {
	addQueryParam(u, paramName, strconv.Itoa(paramValue))
}

func addQueryParam(u *url.URL, paramName string, paramValue string) {
	q := u.Query()
	q.Set(paramName, paramValue)
	u.RawQuery = q.Encode()
}