package notion

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

const (
	baseURL    = "https://api.notion.com/v1"
	apiVersion = "2021-05-13"
)

// Client is used for HTTP requests to the Notion API.
type Client struct {
	apiKey     string
	httpClient *http.Client
}

// ClientOption is used to override default client behavior.
type ClientOption func(*Client)

// NewClient returns a new Client.
func NewClient(apiKey string, opts ...ClientOption) *Client {
	c := &Client{
		apiKey:     apiKey,
		httpClient: http.DefaultClient,
	}

	for _, opt := range opts {
		opt(c)
	}

	return c
}

// WithHTTPClient overrides the default http.Client.
func WithHTTPClient(httpClient *http.Client) ClientOption {
	return func(c *Client) {
		c.httpClient = httpClient
	}
}

func (c *Client) newRequest(method, url string, body io.Reader) (*http.Request, error) {
	req, err := http.NewRequest(method, baseURL+url, body)
	if err != nil {
		return nil, err
	}

	req.Header.Set("Authorization", fmt.Sprintf("Bearer %v", c.apiKey))
	req.Header.Set("Notion-Version", apiVersion)

	return req, nil
}