package grafana

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"path"
	"strings"
)

var DefaultHTTPClient = http.DefaultClient

type Client struct {
	baseURL   string
	key       string
	basicAuth bool
	client    *http.Client
}

func NewClient(apiURL, authString string, client *http.Client) (*Client, error) {
	basicAuth := strings.Contains(authString, ":")
	baseURL, err := url.Parse(apiURL)
	if err != nil {
		return nil, err
	}

	var key string
	if len(authString) > 0 {
		if !basicAuth {
			key = fmt.Sprintf("Bearer %s", authString)
		} else {
			parts := strings.SplitN(authString, ":", 2)
			baseURL.User = url.UserPassword(parts[0], parts[1])
		}
	}

	return &Client{
		baseURL:   baseURL.String(),
		basicAuth: basicAuth,
		key:       key,
		client:    client,
	}, nil
}

func (c *Client) doRequest(ctx context.Context, method, query string, params url.Values, buf io.Reader) ([]byte, int, error) {
	u, _ := url.Parse(c.baseURL)
	u.Path = path.Join(u.Path, query)
	if params != nil {
		u.RawQuery = params.Encode()
	}
	req, err := http.NewRequest(method, u.String(), buf)
	if err != nil {
		return nil, 0, err
	}
	req = req.WithContext(ctx)
	if !c.basicAuth && len(c.key) > 0 {
		req.Header.Set("Authorization", c.key)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("User-Agent", "grafana-backuper")
	resp, err := c.client.Do(req)
	if err != nil {
		return nil, 0, err
	}
	data, err := io.ReadAll(resp.Body)
	resp.Body.Close()
	return data, resp.StatusCode, err
}

func (c *Client) get(ctx context.Context, query string, params url.Values) ([]byte, int, error) {
	return c.doRequest(ctx, "GET", query, params, nil)
}