package internal

import (
	"encoding/xml"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"path"
)

type Client struct {
	http     *http.Client
	endpoint *url.URL
}

func NewClient(c *http.Client, endpoint string) (*Client, error) {
	if c == nil {
		c = http.DefaultClient
	}

	u, err := url.Parse(endpoint)
	if err != nil {
		return nil, err
	}
	return &Client{c, u}, nil
}

func (c *Client) NewRequest(method string, p string, body io.Reader) (*http.Request, error) {
	u := url.URL{
		Scheme: c.endpoint.Scheme,
		User:   c.endpoint.User,
		Host:   c.endpoint.Host,
		Path:   path.Join(c.endpoint.Path, p),
	}
	return http.NewRequest(method, u.String(), body)
}

func (c *Client) Do(req *http.Request) (*http.Response, error) {
	// TODO: remove this quirk
	req.SetBasicAuth("simon", "")
	return c.http.Do(req)
}

func (c *Client) DoMultiStatus(req *http.Request) ([]Response, error) {
	resp, err := c.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusMultiStatus {
		return nil, fmt.Errorf("HTTP multi-status request failed: %v", resp.Status)
	}

	// TODO: the response can be quite large, support streaming Response elements
	var ms multistatus
	if err := xml.NewDecoder(resp.Body).Decode(&ms); err != nil {
		return nil, err
	}

	return ms.Responses, nil
}