package tunnelbroker

import (
	`fmt`
	`runtime`
	`strings`

	`github.com/go-resty/resty/v2`
	`golang.org/x/text/cases`
	`golang.org/x/text/language`
	`r00t2.io/gobroke/conf`
	`r00t2.io/gobroke/version`
)

// GetTunnel returns a tunnel configuration from tunnelbroker.net.
func GetTunnel(cfg *conf.Tunnel, debug bool) (tun *Tunnel, err error) {

	var tuns TunnelList
	var resp *resty.Response
	var req *resty.Request
	var client *resty.Client

	// Set up the client. Namely the UA.
	client = resty.New()
	client.SetDebug(debug)
	client.SetHeader(
		"User-Agent",
		fmt.Sprintf(
			"GoBroke/%s go-resty/%s Go/%s "+
				"(%s %s) "+
				"(https://pkg.go.dev/r00t2.io/gobroke)",
			version.Ver.Short(), resty.Version, runtime.Version(),
			cases.Title(language.English).String(runtime.GOOS), runtime.GOARCH,
		),
	)

	req = client.R()
	req.SetResult(&tuns)
	req.SetBasicAuth(*cfg.Username, cfg.UpdateKey)
	req.SetQueryParam(infoTidParam, fmt.Sprintf("%d", cfg.TunnelID))

	if resp, err = req.Get(infoBaseUrl); err != nil {
		return
	}
	if !resp.IsSuccess() {
		err = respToErr(resp)
		return
	}
	if strings.HasPrefix(resp.String(), tunRespNoTuns) {
		err = ErrHENoTuns
		return
	}

	tun = tuns.Tunnels[0]
	tun.client = client
	tun.tunCfg = cfg

	return
}

// respToErr returns an HTTPError from a resty.Response. err will be nill if the response was a success.
func respToErr(resp *resty.Response) (err *HTTPError) {

	if resp.IsSuccess() {
		return
	}

	err = &HTTPError{
		Code:    resp.StatusCode(),
		CodeStr: resp.Status(),
		Message: nil,
		Resp:    resp,
	}

	if resp.String() != "" {
		err.Message = new(string)
		*err.Message = resp.String()
	}

	return
}