misc: binance momentum, telegram, frontend updates

telegram.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+// TelegramSender sends alerts to a Telegram chat via Bot API.
+type TelegramSender struct {
+	botToken string
+	chatID   string
+	client   *http.Client
+	enabled  bool
+}
+
+// NewTelegramSender creates a sender. Returns a no-op sender if token or chatID is empty.
+func NewTelegramSender(botToken, chatID string) *TelegramSender {
+	return &TelegramSender{
+		botToken: botToken,
+		chatID:   chatID,
+		client: &http.Client{
+			Timeout: 10 * time.Second,
+			Transport: &http.Transport{
+				Proxy: http.ProxyFromEnvironment,
+			},
+		},
+		enabled: botToken != "" && chatID != "",
+	}
+}
+
+// IsEnabled returns true if both token and chatID are configured.
+func (t *TelegramSender) IsEnabled() bool {
+	return t.enabled
+}
+
+// SendAlert sends a formatted momentum alert to Telegram.
+func (t *TelegramSender) SendAlert(alert BinanceAlert) error {
+	if !t.enabled {
+		return nil
+	}
+
+	// Build message
+	icon := "🔴"
+	directionWord := "暴跌"
+	if alert.Direction == "up" {
+		icon = "🟢"
+		directionWord = "暴涨"
+	}
+	sign := "+"
+	if alert.ChangePct < 0 {
+		sign = ""
+	}
+
+	text := fmt.Sprintf("%s *%s* %s %s%.2f%% | $%.4f",
+		icon, alert.Coin, directionWord, sign, alert.ChangePct, alert.Price)
+
+	payload := map[string]interface{}{
+		"chat_id":    t.chatID,
+		"text":       text,
+		"parse_mode": "Markdown",
+	}
+	body, _ := json.Marshal(payload)
+
+	url := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage", t.botToken)
+	resp, err := t.client.Post(url, "application/json", bytes.NewReader(body))
+	if err != nil {
+		return fmt.Errorf("telegram API call failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return fmt.Errorf("telegram API returned %d", resp.StatusCode)
+	}
+
+	log.Printf("[Telegram] Alert sent: %s %s %.2f%%", alert.Coin, alert.Direction, alert.ChangePct)
+	return nil
+}