package cabinet

import (
	"bytes"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"net/url"
)

type Client struct {
	BaseURL string
	HTTP    *http.Client
	Token   string
}

func New(baseURL string, opts ...ClientOption) *Client {
	c := &Client{
		BaseURL: baseURL,
		HTTP:    http.DefaultClient,
	}
	for _, opt := range opts {
		opt(c)
	}
	return c
}

type ClientOption func(*Client)

func WithHTTPClient(client *http.Client) ClientOption {
	return func(c *Client) {
		c.HTTP = client
	}
}

func WithToken(token string) ClientOption {
	return func(c *Client) {
		c.Token = token
	}
}

func (c *Client) Redirect(u string) (string, *http.Response, error) {
	vals := url.Values{
		"url": []string{u},
	}
	if c.Token != "" {
		vals["token"] = []string{c.Token}
	}

	resp, err := c.HTTP.PostForm(fmt.Sprintf("%s/r", c.BaseURL), vals)
	if err != nil {
		return "", nil, err
	}

	if resp.StatusCode != 200 {
		return "", resp, fmt.Errorf("non-200 status code: %s", resp.Status)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", resp, err
	}
	resp.Body = io.NopCloser(bytes.NewReader(body))

	return string(body), resp, nil
}

func (c *Client) File(name string, f io.Reader) (string, *http.Response, error) {
	var buf bytes.Buffer
	mp := multipart.NewWriter(&buf)

	token, err := mp.CreateFormField("token")
	if err != nil {
		return "", nil, err
	}
	if _, err := token.Write([]byte(c.Token)); err != nil {
		return "", nil, err
	}

	file, err := mp.CreateFormFile("file", name)
	if err != nil {
		return "", nil, err
	}

	if _, err := io.Copy(file, f); err != nil {
		return "", nil, err
	}

	if err := mp.Close(); err != nil {
		return "", nil, err
	}

	req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/f", c.BaseURL), &buf)
	if err != nil {
		return "", nil, err
	}
	req.Header.Set("Content-Type", mp.FormDataContentType())

	resp, err := c.HTTP.Do(req)
	if err != nil {
		return "", nil, err
	}

	if resp.StatusCode != 200 {
		return "", resp, fmt.Errorf("non-200 status code: %s", resp.Status)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", resp, err
	}
	resp.Body = io.NopCloser(bytes.NewReader(body))

	return string(body), resp, nil
}