package tg

import (
	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
	//"strings"
	re "regexp"
	"fmt"
)
type Message = tgbotapi.Message

// Simple text message component type.
type MessageCompo struct {
	// Low level Message represents
	// the already sent to the client message.
	// Will be nil if the message is not rendered to the client.
	Message *Message
	// Parsing mode for the text: HTML, MD, MD2...
	ParseMode string
	// The text to display.
	Text string
}

var (
	escapeRe = re.MustCompile(`([_*\[\]()~`+"`"+`>#+-=|{}.!])`)
	NewRawMessage = tgbotapi.NewMessage
)

// Escape special characters in Markdown 2 and return the
// resulting string.
func Escape2(str string) string {
	return string(escapeRe.ReplaceAll([]byte(str), []byte("\\$1")))
}

// Call the function after the message was sent.
func (compo *MessageCompo) Update(c Context) error {
	edit := tgbotapi.NewEditMessageText(
		c.Session().Id.ToApi(),
		compo.Message.MessageID,
		compo.Text,
	)
	msg, err := c.Bot().Api().Send(edit)
	if err != nil {
		return err
	}
	compo.Message = &msg
	return nil
}

// Calling the method removes the message on the client side
// and sets the Message in the component to nil.
func (compo *MessageCompo) Delete(c Context) error {
	cfg := tgbotapi.NewDeleteMessage(c.session.Id.ToApi(), compo.Message.MessageID)
	_, err := c.Bot().Api().Send(cfg)
	if err != nil {
		return err
	}

	// Empty the message if success.
	compo.Message = nil

	return nil
}

// Return new message with the specified text
// formatted with the fmt.Sprintf function.
func Messagef(format string, v ...any) *MessageCompo {
	ret := &MessageCompo{}
	ret.Text = fmt.Sprintf(format, v...)
	ret.ParseMode = tgbotapi.ModeMarkdown
	return ret
}

// Return message with the specified parse mode.
func (compo *MessageCompo) setParseMode(mode string) *MessageCompo {
	compo.ParseMode = mode
	return compo
}

// Set the default Markdown parsing mode.
func (compo *MessageCompo) MD() *MessageCompo {
	return compo.setParseMode(tgbotapi.ModeMarkdown)
}

// Set the Markdown 2 parsing mode.
func (compo *MessageCompo) MD2() *MessageCompo {
	return compo.setParseMode(tgbotapi.ModeMarkdownV2)
}

// Set the HTML parsing mode.
func (compo *MessageCompo) HTML() *MessageCompo {
	return compo.setParseMode(tgbotapi.ModeHTML)
}

// Transform the message component into one with reply keyboard.
func (compo *MessageCompo) Inline(inline Inline) *InlineCompo {
	return &InlineCompo{
		Inline: inline,
		MessageCompo: *compo,
	}
}

// Transform the message component into one with reply keyboard.
func (msg *MessageCompo) Reply(reply Reply) *ReplyCompo {
	return &ReplyCompo{
		Reply: reply,
		MessageCompo: *msg,
	}
}

// Transform the message component into the location one.
func (msg *MessageCompo) Location(
	lat, long float64,
) *LocationCompo {
	ret := &LocationCompo{}
	ret.MessageCompo = *msg
	ret.Latitude = lat
	ret.Longitude = long

	return ret
}

// Implementing the Sendable interface.
func (compo *MessageCompo) SendConfig(
	sid SessionId, bot *Bot,
) (SendConfig) {
	var (
		ret SendConfig
		text string
	)

	// Protection against empty text,
	// since it breaks the Telegram bot API.
	if compo.Text == "" {
		text = ">"
	} else {
		text = compo.Text
	}

	msg := tgbotapi.NewMessage(sid.ToApi(), text)
	msg.ParseMode = compo.ParseMode
	ret.Chattable = msg

	return ret
}

// Implementing the Sendable interface.
// Also used for embedding for things like InlineCompo etc.
func (compo *MessageCompo) SetMessage(msg *Message) {
	compo.Message = msg
}

// Empty serving to use messages in rendering.
func (compo *MessageCompo) Serve(c Context) {}

// Filter that skips everything. Messages cannot do anything with updates.
func (compo *MessageCompo) Filter(_ Update) bool {
	// Skip everything
	return true
}