package tg

import (
	apix "github.com/go-telegram-bot-api/telegram-bot-api/v5"
	"fmt"
	"crypto/rand"
	"encoding/base64"
)

// The type wraps Telegram API's button to provide Action functionality.
type Button struct {
	Text         string
	Data         string
	Url          string
	SendLocation bool
	Action       Action
	// Used to skip buttons in generating by functions.
	Valid bool
}

type ButtonMap map[string]Button

// Returns the only location button in the map and if it is there at all.
// The location map must be the ONLY one.

func (btnMap ButtonMap) LocationButton() (Button, bool) {
	for _, btn := range btnMap {
		if btn.SendLocation {
			return btn, true
		}
	}
	return Button{}, false
}

// Represents the reply button row.
type ButtonRow []Button

// Returns new button with the specified text and no action.
func Buttonf(format string, v ...any) Button {
	return Button{
		Text: fmt.Sprintf(format, v...),
		Valid: true,
	}
}

// Randomize buttons data to make the key unique.
// No guaranties about collisions though.
func (btn Button) Rand() Button {
	rData := make([]byte, 8)
	rand.Read(rData)
	data := make([]byte, base64.StdEncoding.EncodedLen(len(rData)))
	base64.StdEncoding.Encode(data, rData)
	btn.Data = string(data)
	return btn
}

// Set the URL for the button. Only for inline buttons.
func (btn Button) WithUrl(format string, v ...any) Button {
	btn.Url = fmt.Sprintf(format, v...)
	return btn
}

// Set the action when pressing the button.
// By default is nil and does nothing.
func (btn Button) WithAction(a Action) Button {
	btn.Action = a
	return btn
}

func (btn Button) WithData(dat string) Button {
	btn.Data = dat
	return btn
}

// Sets whether the button must send owner's location.
func (btn Button) WithSendLocation(ok bool) Button {
	btn.SendLocation = ok
	return btn
}

func (btn Button) Go(pth Path) Button {
	return btn.WithAction(ScreenGo{
		Path: pth,
	})
}

func (btn Button) GoWithArg(pth Path, arg any) Button {
	return btn.WithAction(ScreenGo{
		Path: pth,
		Arg: arg,
	})
}

func (btn Button) ToTelegram() apix.KeyboardButton {
	ret := apix.NewKeyboardButton(btn.Text)
	if btn.SendLocation {
		ret.RequestLocation = true
	}
	return ret
}

func (btn Button) ToTelegramInline() apix.InlineKeyboardButton {
	if btn.Data != "" {
		return apix.NewInlineKeyboardButtonData(
			btn.Text,
			btn.Data,
		)
	}

	if btn.Url != "" {
		return apix.NewInlineKeyboardButtonURL(
			btn.Text,
			btn.Url,
		)
	}

	// If no match then return the data one with data the same as the text.
	return apix.NewInlineKeyboardButtonData(btn.Text, btn.Text)
}

// Return the key of the button to identify it by messages and callbacks.
func (btn Button) Key() string {
	if btn.Data != "" {
		return btn.Data
	}

	// If no match then return the data one with data the same as the text.
	return btn.Text
}

func NewButtonRow(btns ...Button) ButtonRow {
	return btns
}