package slack

// OutgoingMessage is used for the realtime API, and seems incomplete.
type OutgoingMessage struct {
	ID int `json:"id"`
	// channel ID
	Channel         string   `json:"channel,omitempty"`
	Text            string   `json:"text,omitempty"`
	Type            string   `json:"type,omitempty"`
	ThreadTimestamp string   `json:"thread_ts,omitempty"`
	ThreadBroadcast bool     `json:"reply_broadcast,omitempty"`
	IDs             []string `json:"ids,omitempty"`
}

// Message is an auxiliary type to allow us to have a message containing sub messages
type Message struct {
	Msg
	SubMessage *Msg `json:"message,omitempty"`
	PreviousMessage *Msg `json:"previous_message,omitempty"`
}

// Msg contains information about a slack message
type Msg struct {
	// Basic Message
	Type            string       `json:"type,omitempty"`
	Channel         string       `json:"channel,omitempty"`
	User            string       `json:"user,omitempty"`
	Text            string       `json:"text,omitempty"`
	Timestamp       string       `json:"ts,omitempty"`
	ThreadTimestamp string       `json:"thread_ts,omitempty"`
	IsStarred       bool         `json:"is_starred,omitempty"`
	PinnedTo        []string     `json:"pinned_to,omitempty"`
	Attachments     []Attachment `json:"attachments,omitempty"`
	Edited          *Edited      `json:"edited,omitempty"`
	LastRead        string       `json:"last_read,omitempty"`
	Subscribed      bool         `json:"subscribed,omitempty"`
	UnreadCount     int          `json:"unread_count,omitempty"`

	// Message Subtypes
	SubType string `json:"subtype,omitempty"`

	// Hidden Subtypes
	Hidden           bool   `json:"hidden,omitempty"`     // message_changed, message_deleted, unpinned_item
	DeletedTimestamp string `json:"deleted_ts,omitempty"` // message_deleted
	EventTimestamp   string `json:"event_ts,omitempty"`

	// bot_message (https://api.slack.com/events/message/bot_message)
	BotID    string `json:"bot_id,omitempty"`
	Username string `json:"username,omitempty"`
	Icons    *Icon  `json:"icons,omitempty"`

	// channel_join, group_join
	Inviter string `json:"inviter,omitempty"`

	// channel_topic, group_topic
	Topic string `json:"topic,omitempty"`

	// channel_purpose, group_purpose
	Purpose string `json:"purpose,omitempty"`

	// channel_name, group_name
	Name    string `json:"name,omitempty"`
	OldName string `json:"old_name,omitempty"`

	// channel_archive, group_archive
	Members []string `json:"members,omitempty"`

	// channels.replies, groups.replies, im.replies, mpim.replies
	ReplyCount   int     `json:"reply_count,omitempty"`
	Replies      []Reply `json:"replies,omitempty"`
	ParentUserId string  `json:"parent_user_id,omitempty"`

	// file_share, file_comment, file_mention
	Files []File `json:"files,omitempty"`

	// file_share
	Upload bool `json:"upload,omitempty"`

	// file_comment
	Comment *Comment `json:"comment,omitempty"`

	// pinned_item
	ItemType string `json:"item_type,omitempty"`

	// https://api.slack.com/rtm
	ReplyTo int    `json:"reply_to,omitempty"`
	Team    string `json:"team,omitempty"`

	// reactions
	Reactions []ItemReaction `json:"reactions,omitempty"`

	// slash commands and interactive messages
	ResponseType    string `json:"response_type,omitempty"`
	ReplaceOriginal bool   `json:"replace_original"`
	DeleteOriginal  bool   `json:"delete_original"`

	// Block type Message
	Blocks Blocks `json:"blocks,omitempty"`
}

const (
	// ResponseTypeInChannel in channel response for slash commands.
	ResponseTypeInChannel = "in_channel"
	// ResponseTypeEphemeral ephemeral respone for slash commands.
	ResponseTypeEphemeral = "ephemeral"
)

// Icon is used for bot messages
type Icon struct {
	IconURL   string `json:"icon_url,omitempty"`
	IconEmoji string `json:"icon_emoji,omitempty"`
}

// Edited indicates that a message has been edited.
type Edited struct {
	User      string `json:"user,omitempty"`
	Timestamp string `json:"ts,omitempty"`
}

// Reply contains information about a reply for a thread
type Reply struct {
	User      string `json:"user,omitempty"`
	Timestamp string `json:"ts,omitempty"`
}

// Event contains the event type
type Event struct {
	Type string `json:"type,omitempty"`
}

// Ping contains information about a Ping Event
type Ping struct {
	ID        int    `json:"id"`
	Type      string `json:"type"`
	Timestamp int64  `json:"timestamp"`
}

// Pong contains information about a Pong Event
type Pong struct {
	Type      string `json:"type"`
	ReplyTo   int    `json:"reply_to"`
	Timestamp int64  `json:"timestamp"`
}

// NewOutgoingMessage prepares an OutgoingMessage that the user can
// use to send a message. Use this function to properly set the
// messageID.
func (rtm *RTM) NewOutgoingMessage(text string, channelID string, options ...RTMsgOption) *OutgoingMessage {
	id := rtm.idGen.Next()
	msg := OutgoingMessage{
		ID:      id,
		Type:    "message",
		Channel: channelID,
		Text:    text,
	}
	for _, option := range options {
		option(&msg)
	}
	return &msg
}

// NewSubscribeUserPresence prepares an OutgoingMessage that the user can
// use to subscribe presence events for the specified users.
func (rtm *RTM) NewSubscribeUserPresence(ids []string) *OutgoingMessage {
	return &OutgoingMessage{
		Type: "presence_sub",
		IDs:  ids,
	}
}

// NewTypingMessage prepares an OutgoingMessage that the user can
// use to send as a typing indicator. Use this function to properly set the
// messageID.
func (rtm *RTM) NewTypingMessage(channelID string) *OutgoingMessage {
	id := rtm.idGen.Next()
	return &OutgoingMessage{
		ID:      id,
		Type:    "typing",
		Channel: channelID,
	}
}

// RTMsgOption allows configuration of various options available for sending an RTM message
type RTMsgOption func(*OutgoingMessage)

// RTMsgOptionTS sets thead timestamp of an outgoing message in order to respond to a thread
func RTMsgOptionTS(threadTimestamp string) RTMsgOption {
	return func(msg *OutgoingMessage) {
		msg.ThreadTimestamp = threadTimestamp
	}
}

// RTMsgOptionBroadcast sets broadcast reply to channel to "true"
func RTMsgOptionBroadcast() RTMsgOption {
	return func(msg *OutgoingMessage) {
		msg.ThreadBroadcast = true
	}
}