package client

import (
	"context"
	"fmt"
	"net/http"
)

func (cli *Client) GetUpload(ctx context.Context, rawref string) (string, error) {
	var err error
	var loc string

	ref, err := NewReference(rawref)
	if err != nil {
		return loc, err
	}
	uri := ref.Upload()
	user, pass := ref.Userinfo()

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, uri, nil)
	if err != nil {
		return loc, err
	}
	req.Header.Set("User-Agent", cli.userAgent)
	req.Header.Set("Accept", "*/*")

	if cli.authenticator != nil {
		authHeader, authKey, err := cli.authenticator.MakeHeader(user, pass)
		if err != nil {
			return loc, err
		}
		req.Header.Set(authHeader, authKey)
	}

	resp, err := cli.httpClient.Do(req)
	if err != nil {
		return loc, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusAccepted {
		err := fmt.Errorf("Unxected response code %s", resp.Status)
		return loc, err
	}
	loc = resp.Header.Get("Location")
	if loc == "" {
		err := fmt.Errorf("Empty location declaration")
		return loc, err
	}
	return loc, err
}