// Package tgbotapi has functions and types used for interacting with
// the Telegram Bot API.
package tgbotapi

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/technoweenie/multipartstreamer"
)


type Bot interface {
	MakeRequest(endpoint string, params url.Values) (APIResponse, error)
	UploadFile(endpoint string, params map[string]string, fieldname string, file interface{}) (APIResponse, error)
	GetFileDirectURL(fileID string) (string, error)
	GetMe() (User, error)
	IsMessageToMe(message Message) bool
	Send(c Chattable) (Message, error)
	GetUserProfilePhotos(config UserProfilePhotosConfig) (UserProfilePhotos, error)
	GetFile(config FileConfig) (File, error)
	GetUpdates(config UpdateConfig) ([]Update, error)
	RemoveWebhook() (APIResponse, error)
	SetWebhook(config WebhookConfig) (APIResponse, error)
	GetWebhookInfo() (WebhookInfo, error)
	GetUpdatesChan(config UpdateConfig) (UpdatesChannel, error)
	StopReceivingUpdates()
	ListenForWebhook(pattern string) UpdatesChannel
	AnswerInlineQuery(config InlineConfig) (APIResponse, error)
	AnswerCallbackQuery(config CallbackConfig) (APIResponse, error)
	KickChatMember(config KickChatMemberConfig) (APIResponse, error)
	LeaveChat(config ChatConfig) (APIResponse, error)
	GetChat(config ChatConfig) (Chat, error)
	GetChatAdministrators(config ChatConfig) ([]ChatMember, error)
	GetChatMembersCount(config ChatConfig) (int, error)
	GetChatMember(config ChatConfigWithUser) (ChatMember, error)
	UnbanChatMember(config ChatMemberConfig) (APIResponse, error)
	RestrictChatMember(config RestrictChatMemberConfig) (APIResponse, error)
	PromoteChatMember(config PromoteChatMemberConfig) (APIResponse, error)
	GetGameHighScores(config GetGameHighScoresConfig) ([]GameHighScore, error)
	AnswerShippingQuery(config ShippingConfig) (APIResponse, error)
	AnswerPreCheckoutQuery(config PreCheckoutConfig) (APIResponse, error)
	DeleteMessage(config DeleteMessageConfig) (APIResponse, error)
	GetInviteLink(config ChatConfig) (string, error)
	PinChatMessage(config PinChatMessageConfig) (APIResponse, error)
	UnpinChatMessage(config UnpinChatMessageConfig) (APIResponse, error)
	SetChatTitle(config SetChatTitleConfig) (APIResponse, error)
	SetChatDescription(config SetChatDescriptionConfig) (APIResponse, error)
	SetChatPhoto(config SetChatPhotoConfig) (APIResponse, error)
	DeleteChatPhoto(config DeleteChatPhotoConfig) (APIResponse, error)

}
// BotAPI allows you to interact with the Telegram Bot API.
type BotAPI struct {
	Token  string `json:"token"`
	Debug  bool   `json:"debug"`
	Buffer int    `json:"buffer"`

	Self   User         `json:"-"`
	Client *http.Client `json:"-"`
	shutdownChannel chan interface{}
}

// NewBotAPI creates a new BotAPI instance.
//
// It requires a token, provided by @BotFather on Telegram.
func NewBotAPI(token string) (*BotAPI, error) {
	return NewBotAPIWithClient(token, &http.Client{})
}

// NewBotAPIWithClient creates a new BotAPI instance
// and allows you to pass a http.Client.
//
// It requires a token, provided by @BotFather on Telegram.
func NewBotAPIWithClient(token string, client *http.Client) (*BotAPI, error) {
	bot := &BotAPI{
		Token:  token,
		Client: client,
		Buffer: 100,
		shutdownChannel: make(chan interface{}),
	}

	self, err := bot.GetMe()
	if err != nil {
		return nil, err
	}

	bot.Self = self

	return bot, nil
}

// MakeRequest makes a request to a specific endpoint with our token.
func (bot *BotAPI) MakeRequest(endpoint string, params url.Values) (APIResponse, error) {
	method := fmt.Sprintf(APIEndpoint, bot.Token, endpoint)

	resp, err := bot.Client.PostForm(method, params)
	if err != nil {
		return APIResponse{}, err
	}
	defer resp.Body.Close()

	var apiResp APIResponse
	bytes, err := bot.decodeAPIResponse(resp.Body, &apiResp)
	if err != nil {
		return apiResp, err
	}

	if bot.Debug {
		log.Printf("%s resp: %s", endpoint, bytes)
	}

	if !apiResp.Ok {
		parameters := ResponseParameters{}
		if apiResp.Parameters != nil {
			parameters = *apiResp.Parameters
		}
		return apiResp, Error{apiResp.Description, parameters}
	}

	return apiResp, nil
}

// decodeAPIResponse decode response and return slice of bytes if debug enabled.
// If debug disabled, just decode http.Response.Body stream to APIResponse struct
// for efficient memory usage
func (bot *BotAPI) decodeAPIResponse(responseBody io.Reader, resp *APIResponse) (_ []byte, err error) {
	if !bot.Debug {
		dec := json.NewDecoder(responseBody)
		err = dec.Decode(resp)
		return
	}

	// if debug, read reponse body
	data, err := ioutil.ReadAll(responseBody)
	if err != nil {
		return
	}

	err = json.Unmarshal(data, resp)
	if err != nil {
		return
	}

	return data, nil
}

// makeMessageRequest makes a request to a method that returns a Message.
func (bot *BotAPI) makeMessageRequest(endpoint string, params url.Values) (Message, error) {
	resp, err := bot.MakeRequest(endpoint, params)
	if err != nil {
		return Message{}, err
	}

	var message Message
	json.Unmarshal(resp.Result, &message)

	bot.debugLog(endpoint, params, message)

	return message, nil
}

// UploadFile makes a request to the API with a file.
//
// Requires the parameter to hold the file not be in the params.
// File should be a string to a file path, a FileBytes struct,
// a FileReader struct, or a url.URL.
//
// Note that if your FileReader has a size set to -1, it will read
// the file into memory to calculate a size.
func (bot *BotAPI) UploadFile(endpoint string, params map[string]string, fieldname string, file interface{}) (APIResponse, error) {
	ms := multipartstreamer.New()

	switch f := file.(type) {
	case string:
		ms.WriteFields(params)

		fileHandle, err := os.Open(f)
		if err != nil {
			return APIResponse{}, err
		}
		defer fileHandle.Close()

		fi, err := os.Stat(f)
		if err != nil {
			return APIResponse{}, err
		}

		ms.WriteReader(fieldname, fileHandle.Name(), fi.Size(), fileHandle)
	case FileBytes:
		ms.WriteFields(params)

		buf := bytes.NewBuffer(f.Bytes)
		ms.WriteReader(fieldname, f.Name, int64(len(f.Bytes)), buf)
	case FileReader:
		ms.WriteFields(params)

		if f.Size != -1 {
			ms.WriteReader(fieldname, f.Name, f.Size, f.Reader)

			break
		}

		data, err := ioutil.ReadAll(f.Reader)
		if err != nil {
			return APIResponse{}, err
		}

		buf := bytes.NewBuffer(data)

		ms.WriteReader(fieldname, f.Name, int64(len(data)), buf)
	case url.URL:
		params[fieldname] = f.String()

		ms.WriteFields(params)
	default:
		return APIResponse{}, errors.New(ErrBadFileType)
	}

	method := fmt.Sprintf(APIEndpoint, bot.Token, endpoint)

	req, err := http.NewRequest("POST", method, nil)
	if err != nil {
		return APIResponse{}, err
	}

	ms.SetupRequest(req)

	res, err := bot.Client.Do(req)
	if err != nil {
		return APIResponse{}, err
	}
	defer res.Body.Close()

	bytes, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return APIResponse{}, err
	}

	if bot.Debug {
		log.Println(string(bytes))
	}

	var apiResp APIResponse

	err = json.Unmarshal(bytes, &apiResp)
	if err != nil {
		return APIResponse{}, err
	}

	if !apiResp.Ok {
		return APIResponse{}, errors.New(apiResp.Description)
	}

	return apiResp, nil
}

// GetFileDirectURL returns direct URL to file
//
// It requires the FileID.
func (bot *BotAPI) GetFileDirectURL(fileID string) (string, error) {
	file, err := bot.GetFile(FileConfig{fileID})

	if err != nil {
		return "", err
	}

	return file.Link(bot.Token), nil
}

// GetMe fetches the currently authenticated bot.
//
// This method is called upon creation to validate the token,
// and so you may get this data from BotAPI.Self without the need for
// another request.
func (bot *BotAPI) GetMe() (User, error) {
	resp, err := bot.MakeRequest("getMe", nil)
	if err != nil {
		return User{}, err
	}

	var user User
	json.Unmarshal(resp.Result, &user)

	bot.debugLog("getMe", nil, user)

	return user, nil
}

// IsMessageToMe returns true if message directed to this bot.
//
// It requires the Message.
func (bot *BotAPI) IsMessageToMe(message Message) bool {
	return strings.Contains(message.Text, "@"+bot.Self.UserName)
}

// Send will send a Chattable item to Telegram.
//
// It requires the Chattable to send.
func (bot *BotAPI) Send(c Chattable) (Message, error) {
	switch c.(type) {
	case Fileable:
		return bot.sendFile(c.(Fileable))
	default:
		return bot.sendChattable(c)
	}
}

// debugLog checks if the bot is currently running in debug mode, and if
// so will display information about the request and response in the
// debug log.
func (bot *BotAPI) debugLog(context string, v url.Values, message interface{}) {
	if bot.Debug {
		log.Printf("%s req : %+v\n", context, v)
		log.Printf("%s resp: %+v\n", context, message)
	}
}

// sendExisting will send a Message with an existing file to Telegram.
func (bot *BotAPI) sendExisting(method string, config Fileable) (Message, error) {
	v, err := config.values()

	if err != nil {
		return Message{}, err
	}

	message, err := bot.makeMessageRequest(method, v)
	if err != nil {
		return Message{}, err
	}

	return message, nil
}

// uploadAndSend will send a Message with a new file to Telegram.
func (bot *BotAPI) uploadAndSend(method string, config Fileable) (Message, error) {
	params, err := config.params()
	if err != nil {
		return Message{}, err
	}

	file := config.getFile()

	resp, err := bot.UploadFile(method, params, config.name(), file)
	if err != nil {
		return Message{}, err
	}

	var message Message
	json.Unmarshal(resp.Result, &message)

	bot.debugLog(method, nil, message)

	return message, nil
}

// sendFile determines if the file is using an existing file or uploading
// a new file, then sends it as needed.
func (bot *BotAPI) sendFile(config Fileable) (Message, error) {
	if config.useExistingFile() {
		return bot.sendExisting(config.method(), config)
	}

	return bot.uploadAndSend(config.method(), config)
}

// sendChattable sends a Chattable.
func (bot *BotAPI) sendChattable(config Chattable) (Message, error) {
	v, err := config.values()
	if err != nil {
		return Message{}, err
	}

	message, err := bot.makeMessageRequest(config.method(), v)

	if err != nil {
		return Message{}, err
	}

	return message, nil
}

// GetUserProfilePhotos gets a user's profile photos.
//
// It requires UserID.
// Offset and Limit are optional.
func (bot *BotAPI) GetUserProfilePhotos(config UserProfilePhotosConfig) (UserProfilePhotos, error) {
	v := url.Values{}
	v.Add("user_id", strconv.Itoa(config.UserID))
	if config.Offset != 0 {
		v.Add("offset", strconv.Itoa(config.Offset))
	}
	if config.Limit != 0 {
		v.Add("limit", strconv.Itoa(config.Limit))
	}

	resp, err := bot.MakeRequest("getUserProfilePhotos", v)
	if err != nil {
		return UserProfilePhotos{}, err
	}

	var profilePhotos UserProfilePhotos
	json.Unmarshal(resp.Result, &profilePhotos)

	bot.debugLog("GetUserProfilePhoto", v, profilePhotos)

	return profilePhotos, nil
}

// GetFile returns a File which can download a file from Telegram.
//
// Requires FileID.
func (bot *BotAPI) GetFile(config FileConfig) (File, error) {
	v := url.Values{}
	v.Add("file_id", config.FileID)

	resp, err := bot.MakeRequest("getFile", v)
	if err != nil {
		return File{}, err
	}

	var file File
	json.Unmarshal(resp.Result, &file)

	bot.debugLog("GetFile", v, file)

	return file, nil
}

// GetUpdates fetches updates.
// If a WebHook is set, this will not return any data!
//
// Offset, Limit, and Timeout are optional.
// To avoid stale items, set Offset to one higher than the previous item.
// Set Timeout to a large number to reduce requests so you can get updates
// instantly instead of having to wait between requests.
func (bot *BotAPI) GetUpdates(config UpdateConfig) ([]Update, error) {
	v := url.Values{}
	if config.Offset != 0 {
		v.Add("offset", strconv.Itoa(config.Offset))
	}
	if config.Limit > 0 {
		v.Add("limit", strconv.Itoa(config.Limit))
	}
	if config.Timeout > 0 {
		v.Add("timeout", strconv.Itoa(config.Timeout))
	}

	resp, err := bot.MakeRequest("getUpdates", v)
	if err != nil {
		return []Update{}, err
	}

	var updates []Update
	json.Unmarshal(resp.Result, &updates)

	bot.debugLog("getUpdates", v, updates)

	return updates, nil
}

// RemoveWebhook unsets the webhook.
func (bot *BotAPI) RemoveWebhook() (APIResponse, error) {
	return bot.MakeRequest("setWebhook", url.Values{})
}

// SetWebhook sets a webhook.
//
// If this is set, GetUpdates will not get any data!
//
// If you do not have a legitimate TLS certificate, you need to include
// your self signed certificate with the config.
func (bot *BotAPI) SetWebhook(config WebhookConfig) (APIResponse, error) {

	if config.Certificate == nil {
		v := url.Values{}
		v.Add("url", config.URL.String())
		if config.MaxConnections != 0 {
			v.Add("max_connections", strconv.Itoa(config.MaxConnections))
		}

		return bot.MakeRequest("setWebhook", v)
	}

	params := make(map[string]string)
	params["url"] = config.URL.String()
	if config.MaxConnections != 0 {
		params["max_connections"] = strconv.Itoa(config.MaxConnections)
	}

	resp, err := bot.UploadFile("setWebhook", params, "certificate", config.Certificate)
	if err != nil {
		return APIResponse{}, err
	}

	return resp, nil
}

// GetWebhookInfo allows you to fetch information about a webhook and if
// one currently is set, along with pending update count and error messages.
func (bot *BotAPI) GetWebhookInfo() (WebhookInfo, error) {
	resp, err := bot.MakeRequest("getWebhookInfo", url.Values{})
	if err != nil {
		return WebhookInfo{}, err
	}

	var info WebhookInfo
	err = json.Unmarshal(resp.Result, &info)

	return info, err
}

// GetUpdatesChan starts and returns a channel for getting updates.
func (bot *BotAPI) GetUpdatesChan(config UpdateConfig) (UpdatesChannel, error) {
	ch := make(chan Update, bot.Buffer)

	go func() {
		for {
			select {
			case <-bot.shutdownChannel:
				return
			default:
			}
			
			updates, err := bot.GetUpdates(config)
			if err != nil {
				log.Println(err)
				log.Println("Failed to get updates, retrying in 3 seconds...")
				time.Sleep(time.Second * 3)

				continue
			}

			for _, update := range updates {
				if update.UpdateID >= config.Offset {
					config.Offset = update.UpdateID + 1
					ch <- update
				}
			}
		}
	}()

	return ch, nil
}

// StopReceivingUpdates stops the go routine which receives updates
func (bot *BotAPI) StopReceivingUpdates() {
	if bot.Debug {
		log.Println("Stopping the update receiver routine...")
	}
	close(bot.shutdownChannel)
}

// ListenForWebhook registers a http handler for a webhook.
func (bot *BotAPI) ListenForWebhook(pattern string) UpdatesChannel {
	ch := make(chan Update, bot.Buffer)

	http.HandleFunc(pattern, func(w http.ResponseWriter, r *http.Request) {
		bytes, _ := ioutil.ReadAll(r.Body)
		r.Body.Close()

		var update Update
		json.Unmarshal(bytes, &update)

		ch <- update
	})

	return ch
}

// AnswerInlineQuery sends a response to an inline query.
//
// Note that you must respond to an inline query within 30 seconds.
func (bot *BotAPI) AnswerInlineQuery(config InlineConfig) (APIResponse, error) {
	v := url.Values{}

	v.Add("inline_query_id", config.InlineQueryID)
	v.Add("cache_time", strconv.Itoa(config.CacheTime))
	v.Add("is_personal", strconv.FormatBool(config.IsPersonal))
	v.Add("next_offset", config.NextOffset)
	data, err := json.Marshal(config.Results)
	if err != nil {
		return APIResponse{}, err
	}
	v.Add("results", string(data))
	v.Add("switch_pm_text", config.SwitchPMText)
	v.Add("switch_pm_parameter", config.SwitchPMParameter)

	bot.debugLog("answerInlineQuery", v, nil)

	return bot.MakeRequest("answerInlineQuery", v)
}

// AnswerCallbackQuery sends a response to an inline query callback.
func (bot *BotAPI) AnswerCallbackQuery(config CallbackConfig) (APIResponse, error) {
	v := url.Values{}

	v.Add("callback_query_id", config.CallbackQueryID)
	if config.Text != "" {
		v.Add("text", config.Text)
	}
	v.Add("show_alert", strconv.FormatBool(config.ShowAlert))
	if config.URL != "" {
		v.Add("url", config.URL)
	}
	v.Add("cache_time", strconv.Itoa(config.CacheTime))

	bot.debugLog("answerCallbackQuery", v, nil)

	return bot.MakeRequest("answerCallbackQuery", v)
}

// KickChatMember kicks a user from a chat. Note that this only will work
// in supergroups, and requires the bot to be an admin. Also note they
// will be unable to rejoin until they are unbanned.
func (bot *BotAPI) KickChatMember(config KickChatMemberConfig) (APIResponse, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}
	v.Add("user_id", strconv.Itoa(config.UserID))

	if config.UntilDate != 0 {
		v.Add("until_date", strconv.FormatInt(config.UntilDate, 10))
	}

	bot.debugLog("kickChatMember", v, nil)

	return bot.MakeRequest("kickChatMember", v)
}

// LeaveChat makes the bot leave the chat.
func (bot *BotAPI) LeaveChat(config ChatConfig) (APIResponse, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}

	bot.debugLog("leaveChat", v, nil)

	return bot.MakeRequest("leaveChat", v)
}

// GetChat gets information about a chat.
func (bot *BotAPI) GetChat(config ChatConfig) (Chat, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}

	resp, err := bot.MakeRequest("getChat", v)
	if err != nil {
		return Chat{}, err
	}

	var chat Chat
	err = json.Unmarshal(resp.Result, &chat)

	bot.debugLog("getChat", v, chat)

	return chat, err
}

// GetChatAdministrators gets a list of administrators in the chat.
//
// If none have been appointed, only the creator will be returned.
// Bots are not shown, even if they are an administrator.
func (bot *BotAPI) GetChatAdministrators(config ChatConfig) ([]ChatMember, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}

	resp, err := bot.MakeRequest("getChatAdministrators", v)
	if err != nil {
		return []ChatMember{}, err
	}

	var members []ChatMember
	err = json.Unmarshal(resp.Result, &members)

	bot.debugLog("getChatAdministrators", v, members)

	return members, err
}

// GetChatMembersCount gets the number of users in a chat.
func (bot *BotAPI) GetChatMembersCount(config ChatConfig) (int, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}

	resp, err := bot.MakeRequest("getChatMembersCount", v)
	if err != nil {
		return -1, err
	}

	var count int
	err = json.Unmarshal(resp.Result, &count)

	bot.debugLog("getChatMembersCount", v, count)

	return count, err
}

// GetChatMember gets a specific chat member.
func (bot *BotAPI) GetChatMember(config ChatConfigWithUser) (ChatMember, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}
	v.Add("user_id", strconv.Itoa(config.UserID))

	resp, err := bot.MakeRequest("getChatMember", v)
	if err != nil {
		return ChatMember{}, err
	}

	var member ChatMember
	err = json.Unmarshal(resp.Result, &member)

	bot.debugLog("getChatMember", v, member)

	return member, err
}

// UnbanChatMember unbans a user from a chat. Note that this only will work
// in supergroups and channels, and requires the bot to be an admin.
func (bot *BotAPI) UnbanChatMember(config ChatMemberConfig) (APIResponse, error) {
	v := url.Values{}

	if config.SuperGroupUsername != "" {
		v.Add("chat_id", config.SuperGroupUsername)
	} else if config.ChannelUsername != "" {
		v.Add("chat_id", config.ChannelUsername)
	} else {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	}
	v.Add("user_id", strconv.Itoa(config.UserID))

	bot.debugLog("unbanChatMember", v, nil)

	return bot.MakeRequest("unbanChatMember", v)
}

// RestrictChatMember to restrict a user in a supergroup. The bot must be an
//administrator in the supergroup for this to work and must have the
//appropriate admin rights. Pass True for all boolean parameters to lift
//restrictions from a user. Returns True on success.
func (bot *BotAPI) RestrictChatMember(config RestrictChatMemberConfig) (APIResponse, error) {
	v := url.Values{}

	if config.SuperGroupUsername != "" {
		v.Add("chat_id", config.SuperGroupUsername)
	} else if config.ChannelUsername != "" {
		v.Add("chat_id", config.ChannelUsername)
	} else {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	}
	v.Add("user_id", strconv.Itoa(config.UserID))

	if config.CanSendMessages != nil {
		v.Add("can_send_messages", strconv.FormatBool(*config.CanSendMessages))
	}
	if config.CanSendMediaMessages != nil {
		v.Add("can_send_media_messages", strconv.FormatBool(*config.CanSendMediaMessages))
	}
	if config.CanSendOtherMessages != nil {
		v.Add("can_send_other_messages", strconv.FormatBool(*config.CanSendOtherMessages))
	}
	if config.CanAddWebPagePreviews != nil {
		v.Add("can_add_web_page_previews", strconv.FormatBool(*config.CanAddWebPagePreviews))
	}
	if config.UntilDate != 0 {
		v.Add("until_date", strconv.FormatInt(config.UntilDate, 10))
	}

	bot.debugLog("restrictChatMember", v, nil)

	return bot.MakeRequest("restrictChatMember", v)
}

// PromoteChatMember add admin rights to user
func (bot *BotAPI) PromoteChatMember(config PromoteChatMemberConfig) (APIResponse, error) {
	v := url.Values{}

	if config.SuperGroupUsername != "" {
		v.Add("chat_id", config.SuperGroupUsername)
	} else if config.ChannelUsername != "" {
		v.Add("chat_id", config.ChannelUsername)
	} else {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	}
	v.Add("user_id", strconv.Itoa(config.UserID))

	if config.CanChangeInfo != nil {
		v.Add("can_change_info", strconv.FormatBool(*config.CanChangeInfo))
	}
	if config.CanPostMessages != nil {
		v.Add("can_post_messages", strconv.FormatBool(*config.CanPostMessages))
	}
	if config.CanEditMessages != nil {
		v.Add("can_edit_messages", strconv.FormatBool(*config.CanEditMessages))
	}
	if config.CanDeleteMessages != nil {
		v.Add("can_delete_messages", strconv.FormatBool(*config.CanDeleteMessages))
	}
	if config.CanInviteUsers != nil {
		v.Add("can_invite_users", strconv.FormatBool(*config.CanInviteUsers))
	}
	if config.CanRestrictMembers != nil {
		v.Add("can_restrict_members", strconv.FormatBool(*config.CanRestrictMembers))
	}
	if config.CanPinMessages != nil {
		v.Add("can_pin_messages", strconv.FormatBool(*config.CanPinMessages))
	}
	if config.CanPromoteMembers != nil {
		v.Add("can_promote_members", strconv.FormatBool(*config.CanPromoteMembers))
	}

	bot.debugLog("promoteChatMember", v, nil)

	return bot.MakeRequest("promoteChatMember", v)
}

// GetGameHighScores allows you to get the high scores for a game.
func (bot *BotAPI) GetGameHighScores(config GetGameHighScoresConfig) ([]GameHighScore, error) {
	v, _ := config.values()

	resp, err := bot.MakeRequest(config.method(), v)
	if err != nil {
		return []GameHighScore{}, err
	}

	var highScores []GameHighScore
	err = json.Unmarshal(resp.Result, &highScores)

	return highScores, err
}

// AnswerShippingQuery allows you to reply to Update with shipping_query parameter.
func (bot *BotAPI) AnswerShippingQuery(config ShippingConfig) (APIResponse, error) {
	v := url.Values{}

	v.Add("shipping_query_id", config.ShippingQueryID)
	v.Add("ok", strconv.FormatBool(config.OK))
	if config.OK == true {
		data, err := json.Marshal(config.ShippingOptions)
		if err != nil {
			return APIResponse{}, err
		}
		v.Add("shipping_options", string(data))
	} else {
		v.Add("error_message", config.ErrorMessage)
	}

	bot.debugLog("answerShippingQuery", v, nil)

	return bot.MakeRequest("answerShippingQuery", v)
}

// AnswerPreCheckoutQuery allows you to reply to Update with pre_checkout_query.
func (bot *BotAPI) AnswerPreCheckoutQuery(config PreCheckoutConfig) (APIResponse, error) {
	v := url.Values{}

	v.Add("pre_checkout_query_id", config.PreCheckoutQueryID)
	v.Add("ok", strconv.FormatBool(config.OK))
	if config.OK != true {
		v.Add("error", config.ErrorMessage)
	}

	bot.debugLog("answerPreCheckoutQuery", v, nil)

	return bot.MakeRequest("answerPreCheckoutQuery", v)
}

// DeleteMessage deletes a message in a chat
func (bot *BotAPI) DeleteMessage(config DeleteMessageConfig) (APIResponse, error) {
	v, err := config.values()
	if err != nil {
		return APIResponse{}, err
	}

	bot.debugLog(config.method(), v, nil)

	return bot.MakeRequest(config.method(), v)
}

// GetInviteLink get InviteLink for a chat
func (bot *BotAPI) GetInviteLink(config ChatConfig) (string, error) {
	v := url.Values{}

	if config.SuperGroupUsername == "" {
		v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
	} else {
		v.Add("chat_id", config.SuperGroupUsername)
	}

	resp, err := bot.MakeRequest("exportChatInviteLink", v)
	if err != nil {
		return "", err
	}

	var inviteLink string
	err = json.Unmarshal(resp.Result, &inviteLink)

	return inviteLink, err
}

// PinChatMessage pin message in supergroup
func (bot *BotAPI) PinChatMessage(config PinChatMessageConfig) (APIResponse, error) {
	v, err := config.values()
	if err != nil {
		return APIResponse{}, err
	}

	bot.debugLog(config.method(), v, nil)

	return bot.MakeRequest(config.method(), v)
}

// UnpinChatMessage unpin message in supergroup
func (bot *BotAPI) UnpinChatMessage(config UnpinChatMessageConfig) (APIResponse, error) {
	v, err := config.values()
	if err != nil {
		return APIResponse{}, err
	}

	bot.debugLog(config.method(), v, nil)

	return bot.MakeRequest(config.method(), v)
}

// SetChatTitle change title of chat.
func (bot *BotAPI) SetChatTitle(config SetChatTitleConfig) (APIResponse, error) {
	v, err := config.values()
	if err != nil {
		return APIResponse{}, err
	}

	bot.debugLog(config.method(), v, nil)

	return bot.MakeRequest(config.method(), v)
}

// SetChatDescription change description of chat.
func (bot *BotAPI) SetChatDescription(config SetChatDescriptionConfig) (APIResponse, error) {
	v, err := config.values()
	if err != nil {
		return APIResponse{}, err
	}

	bot.debugLog(config.method(), v, nil)

	return bot.MakeRequest(config.method(), v)
}

// SetChatPhoto change photo of chat.
func (bot *BotAPI) SetChatPhoto(config SetChatPhotoConfig) (APIResponse, error) {
	params, err := config.params()
	if err != nil {
		return APIResponse{}, err
	}

	file := config.getFile()

	return bot.UploadFile(config.method(), params, config.name(), file)
}

// DeleteChatPhoto delete photo of chat.
func (bot *BotAPI) DeleteChatPhoto(config DeleteChatPhotoConfig) (APIResponse, error) {
	v, err := config.values()
	if err != nil {
		return APIResponse{}, err
	}

	bot.debugLog(config.method(), v, nil)

	return bot.MakeRequest(config.method(), v)
}