package bot

import "encoding/json"

type Message struct {
	IsGroup     bool        `json:"isGroup"`
	ChannelData ChannelData `json:"channelData"`
	Activity    Activity    `json:"activity"`
}

type ChannelData struct {
	Channel Channel `json:"channel"`
}

type Channel struct {
	ID string `json:"id"`
}

type Activity struct {
	Type string `json:"type"`
	Text string `json:"text"`
}

func NewMessage(isGroup bool, channelData ChannelData, activity Activity) *Message {
	return &Message{
		IsGroup:     isGroup,
		ChannelData: channelData,
		Activity:    activity,
	}
}

func NewTextPost(channelId, text string) *Message {
	return &Message{
		IsGroup: true,
		ChannelData: ChannelData{
			Channel: Channel{
				ID: channelId,
			},
		},
		Activity: Activity{
			Type: "message",
			Text: text,
		},
	}
}

func (m *Message) ToJSON() (string, error) {
	jsonBytes, err := json.Marshal(m)
	if err != nil {
		return "", err
	}
	return string(jsonBytes), nil
}