package main

import (
	"context"
	"fmt"
)

// --- Custom types for TG adapter ---

type ChatInfo struct {
	ID    int64
	Type  string
	Title string
}

type UserInfo struct {
	ID        int64
	IsBot     bool
	UserName  string
	FirstName string
	LastName  string
}

type PhotoSize struct {
	FileID   string
	FileSize int
}

type FileInfo struct {
	FileID   string
	FileName string
	FileSize int
}

type DocInfo struct {
	FileID   string
	FileName string
	FileSize int
	MimeType string
}

type AudioInfo struct {
	FileID   string
	FileName string
	FileSize int
}

type StickerInfo struct {
	FileID     string
	FileSize   int
	IsAnimated bool
}

type Entity struct {
	Type   string
	Offset int
	Length int
	URL    string
}

type TGMessage struct {
	MessageID       int
	MessageThreadID int
	Chat            ChatInfo
	From            *UserInfo
	SenderChat      *ChatInfo
	Text            string
	Caption         string
	Photo           []PhotoSize
	Video           *FileInfo
	Document        *DocInfo
	Animation       *FileInfo
	Sticker         *StickerInfo
	Voice           *FileInfo
	Audio           *AudioInfo
	VideoNote       *FileInfo
	MediaGroupID    string
	ReplyToMessage  *TGMessage
	ForwardOriginChat *ChatInfo // replaces ForwardFromChat, from forward_origin
	MigrateToChatID int64
	Entities        []Entity
	CaptionEntities []Entity
}

type TGCallback struct {
	ID      string
	From    *UserInfo
	Message *TGMessage
	Data    string
}

type TGUpdate struct {
	Message           *TGMessage
	EditedMessage     *TGMessage
	ChannelPost       *TGMessage
	EditedChannelPost *TGMessage
	CallbackQuery     *TGCallback
}

// SendOpts — optional parameters for send methods.
type SendOpts struct {
	ThreadID    int
	ReplyToID   int
	ParseMode   string
	Caption     string
	ReplyMarkup *InlineKeyboardMarkup
}

type InlineKeyboardMarkup struct {
	Rows [][]InlineKeyboardButton
}

type InlineKeyboardButton struct {
	Text         string
	CallbackData string
}

// FileArg — source for file upload: either Bytes (upload) or URL (send from URL).
type FileArg struct {
	Name  string
	Bytes []byte
	URL   string
}

// TGInputMedia — item for media groups and edit-media.
type TGInputMedia struct {
	Type      string // "photo", "video", "audio", "document"
	File      FileArg
	Caption   string
	ParseMode string
}

type BotCommand struct {
	Command     string
	Description string
}

type CommandScope struct {
	Type string // "", "all_chat_administrators"
}

// TGError represents a Telegram API error.
type TGError struct {
	Code            int
	Description     string
	MigrateToChatID int64
}

func (e *TGError) Error() string {
	return fmt.Sprintf("telegram: %s (%d)", e.Description, e.Code)
}

// --- Keyboard helpers ---

func NewInlineKeyboard(rows ...[]InlineKeyboardButton) *InlineKeyboardMarkup {
	return &InlineKeyboardMarkup{Rows: rows}
}

func NewInlineRow(buttons ...InlineKeyboardButton) []InlineKeyboardButton {
	return buttons
}

func NewInlineButton(text, data string) InlineKeyboardButton {
	return InlineKeyboardButton{Text: text, CallbackData: data}
}

// --- Interface ---

// TGSender abstracts Telegram Bot API. All TG calls go through this interface.
type TGSender interface {
	// Send methods return message ID.
	SendMessage(ctx context.Context, chatID int64, text string, opts *SendOpts) (int, error)
	SendPhoto(ctx context.Context, chatID int64, file FileArg, opts *SendOpts) (int, error)
	SendVideo(ctx context.Context, chatID int64, file FileArg, opts *SendOpts) (int, error)
	SendAudio(ctx context.Context, chatID int64, file FileArg, opts *SendOpts) (int, error)
	SendDocument(ctx context.Context, chatID int64, file FileArg, opts *SendOpts) (int, error)
	SendMediaGroup(ctx context.Context, chatID int64, media []TGInputMedia, opts *SendOpts) ([]int, error)

	EditMessageText(ctx context.Context, chatID int64, msgID int, text string, opts *SendOpts) error
	EditMessageMedia(ctx context.Context, chatID int64, msgID int, media TGInputMedia) error

	DeleteMessage(ctx context.Context, chatID int64, msgID int) error
	AnswerCallback(ctx context.Context, callbackID string, text string) error

	GetFile(ctx context.Context, fileID string) (filePath string, err error)
	GetFileDirectURL(filePath string) string
	GetChatMember(ctx context.Context, chatID, userID int64) (status string, err error)
	SetMyCommands(ctx context.Context, commands []BotCommand, scope *CommandScope) error
	GetChat(ctx context.Context, chatID int64) (title string, err error)

	SetWebhook(ctx context.Context, url string) error
	DeleteWebhook(ctx context.Context) error
	StartWebhook(ctx context.Context, path string) <-chan TGUpdate
	StartPolling(ctx context.Context) <-chan TGUpdate

	BotUsername() string
	BotToken() string
}