not working concept

market.go

@@ -1,19 +1,28 @@
-package market
+package main
 
 import (
 	"bytes"
 	"fmt"
 	"image"
-	"io"
+	_ "image/jpeg"
+	"image/png"
 	"log"
 	"math/rand"
 	"net/http"
 	"time"
 
 	"git.niplace.ru/XoxJlopeZi4BB/imageutils"
+	"git.niplace.ru/XoxJlopeZi4BB/paxpamir/token"
 	tg "github.com/go-telegram-bot-api/telegram-bot-api/v5"
 )
 
+const (
+	CardNum        = 116
+	DominanceCheck = 4
+	EventCards     = 12
+	SpecialCards   = DominanceCheck + EventCards
+)
+
 func shuffle[S ~[]E, E any](a S) {
 	rand.Seed(time.Now().UnixNano())
 	for i := len(a) - 1; i > 0; i-- {
@@ -35,7 +44,7 @@ var ShuffledCardPool []int = func(n int) []int {
 	}
 	shuffle(arr)
 	return arr
-}(116)
+}(CardNum)
 
 var RupeesOnCards []int = func() (ns []int) {
 	rand.Seed(time.Now().UnixNano())
@@ -45,8 +54,8 @@ var RupeesOnCards []int = func() (ns []int) {
 	return
 }()
 
-var LinkFormat string = "https://rally-the-troops.com/" +
-	"pax-pamir/cards/card_%d.jpg"
+var LinkFormat string = "https://rally-the-troops.com" +
+	"/pax-pamir/cards/card_%d.jpg"
 
 type Button struct {
 	Text string `json:"text"`
@@ -75,47 +84,78 @@ func Buttons(b []Button) tg.InlineKeyboardMarkup {
 	)
 }
 
+func Must[T any](v T, err error) T {
+	if err != nil {
+		log.Println("ERROR:", err)
+	}
+	return v
+}
+
+func GetImage(link string) (image.Image, error) {
+	resp, err := http.Get(link)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	img, _, err := image.Decode(resp.Body)
+	if img == nil {
+		log.Fatal("img is nil")
+	}
+	if err != nil {
+		return nil, err
+	}
+	return img, nil
+}
+
 func HandleCommand(update tg.Update, bot *tg.BotAPI) {
 	maxCost := 5
+	var err error
 	for i := 0; i <= maxCost; i++ {
-		var (
-			msg tg.PhotoConfig
-			buf *bytes.Buffer
-			img image.Image
+		var buf *bytes.Buffer
+		var img = imageutils.Concat(
+			Must(GetImage(fmt.Sprintf(LinkFormat,
+				takeOne(ShuffledCardPool)))),
+			Must(GetImage(fmt.Sprintf(LinkFormat,
+				takeOne(ShuffledCardPool)))),
+			imageutils.Right,
 		)
-
-		for j := 0; j < 2; j++ {
-			cardNum := ShuffledCardPool[0]
-			ShuffledCardPool = ShuffledCardPool[1:]
-			resp, err := http.Get(fmt.Sprintf(LinkFormat,
-				cardNum))
-			if err != nil {
-				log.Println("http GET error:", err)
-			}
-			defer resp.Body.Close()
-
-			io.Copy(buf, resp.Body)
+		if img == nil {
+			log.Fatal("pizdec")
 		}
-		msg = tg.NewPhoto(
-			update.Message.Chat.ID,
-			tg.FileBytes(buf.Bytes()),
+
+		err = png.Encode(
+			buf,
+			img,
 		)
+		if err != nil {
+			log.Println("error on decode:", err)
+		}
+
 		buttons := []Button{}
 		for j := 0; j < 2; j++ {
 			text := func() (s string) {
 				s = fmt.Sprintf("buy for %d", i)
-				if RupeesOnCard[j] >= i {
+				if RupeesOnCards[j] >= i {
 					s += fmt.Sprintf(", get 1")
 				}
 				return
 			}()
-			buttons := append(buttons, Button{Text: text})
+			buttons = append(buttons, Button{Text: text})
 		}
-		_, err := bot.Send(msg) // get response message
+
+		msg := tg.NewPhoto(
+			update.Message.Chat.ID,
+			tg.FileBytes{Name: "cards", Bytes: buf.Bytes()},
+		)
+		msg.ReplyMarkup = Buttons(buttons)
+
+		responseMsg, err := bot.Send(msg) // get response message
 		if err != nil {
 			log.Println("failed to send message on command:",
 				err)
 		}
+
 		log.Print("message sent. id:", responseMsg.MessageID)
 	}
 }
@@ -150,3 +190,18 @@ func ConsumeCallback(update tg.Update, bot *tg.BotAPI) {
 	}
 	log.Print("request sent. response:", req.Description)
 }
+
+func main() {
+	bot := Must(tg.NewBotAPI(token.Token()))
+	{
+		log.Printf("authorized on account %s", bot.Self.UserName)
+		u := tg.NewUpdate(0)
+		u.Timeout = 60
+
+		updates := bot.GetUpdatesChan(u)
+
+		for update := range updates {
+			HandleUpdate(update, bot)
+		}
+	}
+}