Added buttons

buttons.go

@@ -0,0 +1,121 @@
+package vkapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"strconv"
+)
+
+type Keyboard struct {
+	OneTime bool       `json:"one_time"`
+	Buttons [][]Button `json:"buttons"`
+}
+
+type Button struct {
+	Action Action      `json:"action"`
+	Color  ColorButton `json:"color"`
+}
+
+type Action struct {
+	Type  string `json:"type"`
+	Label string `json:"label"`
+}
+
+type ColorButton string
+
+const (
+	Negative ColorButton = "negative"
+	Positive ColorButton = "positive"
+	Default  ColorButton = "default"
+	Primary  ColorButton = "primary"
+)
+
+func CreateButtons(buttons ...[]Button) [][]Button {
+	length := len(buttons)
+	if length > 8 {
+		panic("Amount rows are more 8.")
+	}
+
+	return buttons
+}
+
+func CreateButtonsInRow(textAndColorButtons map[string]ColorButton) []Button {
+	length := len(textAndColorButtons)
+	if length > 4 {
+		panic("Amount buttons in the row are more 4.")
+	}
+
+	var buttons []Button
+
+	for text, color := range textAndColorButtons {
+		button := new(Button)
+		button.Action.Type = "text"
+		button.Action.Label = text
+		button.Color = color
+
+		buttons = append(buttons, *button)
+	}
+
+	return buttons
+}
+
+func (client *Client) SendKeyboard(id int64, message string, isOneTime bool, buttons [][]Button) (int64, *Error) {
+	config := NewMessage(NewDstFromUserID(id), message)
+	values := addParameters(config)
+
+	keyboard := new(Keyboard)
+	keyboard.OneTime = isOneTime
+	keyboard.Buttons = buttons
+	values.Add("keyboard", convertToJson(keyboard))
+
+	request := NewRequest("messages.send", config.AccessToken, values)
+	res, err := client.Do(request)
+	if err != nil {
+		return 0, err
+	}
+
+	answer, error := strconv.ParseInt(res.Response.String(), 10, 64)
+	if error != nil {
+		return 0, NewError(ErrBadResponseCode, error.Error())
+	}
+
+	return answer, nil
+}
+
+func convertToJson(i interface{}) string {
+	jsonObject, _ := json.Marshal(i)
+	stringJsonObject := string(jsonObject)
+	return stringJsonObject
+}
+
+func addParameters(config MessageConfig) url.Values {
+	values := config.Destination.Values()
+
+	if len(config.ForwardMessages) != 0 {
+		values.Add("forward_messages", ConcatInt64ToString(config.ForwardMessages...))
+	}
+
+	if config.StickerID != 0 {
+		values.Add("sticker_id", fmt.Sprintf("%d", config.StickerID))
+	}
+
+	if config.Message != "" {
+		values.Add("message", config.Message)
+	}
+
+	if config.RandomID != 0 {
+		values.Add("random_id", fmt.Sprintf("%d", config.RandomID))
+	}
+
+	if config.geo {
+		values.Add("lat", strconv.FormatFloat(config.lat, 'f', -1, 64))
+		values.Add("long", strconv.FormatFloat(config.long, 'f', -1, 64))
+	}
+
+	if config.Attachment != "" {
+		values.Add("attachment", config.Attachment)
+	}
+
+	return values
+}