package serverapi

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"
)

// Client is a client aimed at a specific ServerAPI endpoint
type Client struct {
	Endpoint string
	Options  *ClientOptions
}

// ClientOptions are options that can be set for a Client
type ClientOptions struct {
	HTTP     *http.Client
	Password string
}

var (
	// DefaultOptions are the default set of ClientOptions for a Client
	DefaultOptions = &ClientOptions{
		HTTP: http.DefaultClient,
	}

	defaultHeader = http.Header{
		"Content-Type": []string{"application/json; charset=utf-8"},
		"Accept":       []string{"application/json; charset=utf-8"},
	}
)

// NewClient returns a new Client for making ServerAPI requests
func NewClient(endpoint string, options *ClientOptions) *Client {
	if options == nil {
		options = DefaultOptions
	}
	endpoint = strings.TrimSuffix(endpoint, "/")
	return &Client{
		Endpoint: endpoint,
		Options:  options,
	}
}

func (c *Client) json(endpoint string, obj interface{}) error {
	req, err := http.NewRequest(http.MethodGet, endpoint, nil)
	if err != nil {
		return fmt.Errorf("new JSON request: %v", err)
	}
	req.Header = defaultHeader
	req.Header.Add("X-ServerAPI-Password", c.Options.Password)

	res, err := c.Options.HTTP.Do(req)
	if err != nil {
		return fmt.Errorf("sending request: %v", err)
	}

	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return fmt.Errorf("reading body: %v", err)
	}

	return json.Unmarshal(body, obj)
}