Add detailed PnL and duration stats to dashboard

config.go

@@ -1,10 +1,13 @@
 package main
 
 import (
+	"encoding/json"
 	"os"
 	"strconv"
 )
 
+// Config holds all system configuration.
+// Priority: .env vars > config.json > code defaults.
 type Config struct {
 	TelegramBotToken string
 	TelegramChatID   string
@@ -14,7 +17,7 @@ type Config struct {
 
 	// Automated trading
 	TradeEnabled    bool
-	TradeThreshold  float64 // minimum profit % to execute trade (>0.15%)
+	TradeThreshold  float64 // minimum profit % to execute trade
 	TradeAmountUSD  float64 // amount per trade in USDT
 	TradeCooldownMs int     // ms between trades of same coin
 
@@ -32,7 +35,24 @@ type Config struct {
 	HLAddress    string // wallet address
 }
 
+// jsonConfig maps config.json fields (non-secret defaults checked into git).
+type jsonConfig struct {
+	TestMode         bool    `json:"test_mode"`
+	TradeEnabled     bool    `json:"trade_enabled"`
+	ArbThreshold     float64 `json:"arb_threshold"`
+	ScanIntervalMs   int     `json:"scan_interval_ms"`
+	TradeThreshold   float64 `json:"trade_threshold"`
+	TradeAmountUSD   float64 `json:"trade_amount_usd"`
+	TradeCooldownMs  int     `json:"trade_cooldown_ms"`
+	AlertCooldownSec int     `json:"alert_cooldown_sec"`
+	MockSlippagePct  float64 `json:"mock_slippage_pct"`
+}
+
 func LoadConfig() *Config {
+	// 1. Load config.json defaults
+	jsonCfg := loadJSONConfig()
+
+	// 2. .env vars override config.json
 	getEnv := func(key, def string) string {
 		if v := os.Getenv(key); v != "" {
 			return v
@@ -61,17 +81,17 @@ func LoadConfig() *Config {
 	return &Config{
 		TelegramBotToken: getEnv("TELEGRAM_BOT_TOKEN", ""),
 		TelegramChatID:   getEnv("TELEGRAM_CHAT_ID", ""),
-		AlertCooldownSec: 300,
-		ArbThreshold:     0.03,
-		ScanIntervalMs:   int(getFloat("SCAN_INTERVAL_MS", 500)),
+		AlertCooldownSec: int(getFloat("ALERT_COOLDOWN_SEC", float64(jsonCfg.AlertCooldownSec))),
+		ArbThreshold:     getFloat("ARB_THRESHOLD", jsonCfg.ArbThreshold),
+		ScanIntervalMs:   int(getFloat("SCAN_INTERVAL_MS", float64(jsonCfg.ScanIntervalMs))),
 
-		TradeEnabled:    getBool("TRADE_ENABLED", false),
-		TradeThreshold:  getFloat("TRADE_THRESHOLD", 0.15),
-		TradeAmountUSD:  getFloat("TRADE_AMOUNT_USD", 10),
-		TradeCooldownMs: 30000,
+		TradeEnabled:    getBool("TRADE_ENABLED", jsonCfg.TradeEnabled),
+		TradeThreshold:  getFloat("TRADE_THRESHOLD", jsonCfg.TradeThreshold),
+		TradeAmountUSD:  getFloat("TRADE_AMOUNT_USD", jsonCfg.TradeAmountUSD),
+		TradeCooldownMs: int(getFloat("TRADE_COOLDOWN_MS", float64(jsonCfg.TradeCooldownMs))),
 
-		TestMode:        getBool("TEST_MODE", false),
-		MockSlippagePct: getFloat("MOCK_SLIPPAGE_PCT", 0.005),
+		TestMode:        getBool("TEST_MODE", jsonCfg.TestMode),
+		MockSlippagePct: getFloat("MOCK_SLIPPAGE_PCT", jsonCfg.MockSlippagePct),
 
 		BitgetAPIKey:     getEnv("BITGET_API_KEY", ""),
 		BitgetAPISecret:  getEnv("BITGET_API_SECRET", ""),
@@ -81,3 +101,50 @@ func LoadConfig() *Config {
 		HLAddress:    getEnv("HL_ADDRESS", ""),
 	}
 }
+
+func loadJSONConfig() jsonConfig {
+	def := jsonConfig{
+		ArbThreshold:     0.03,
+		ScanIntervalMs:   500,
+		TradeThreshold:   0.15,
+		TradeAmountUSD:   10,
+		TradeCooldownMs:  30000,
+		AlertCooldownSec: 300,
+		MockSlippagePct:  0.005,
+	}
+
+	data, err := os.ReadFile("config.json")
+	if err != nil {
+		return def // file not found, use code defaults
+	}
+
+	var cfg jsonConfig
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return def
+	}
+
+	// Only override if the JSON file actually set the field
+	if cfg.ArbThreshold != 0 {
+		def.ArbThreshold = cfg.ArbThreshold
+	}
+	if cfg.ScanIntervalMs != 0 {
+		def.ScanIntervalMs = cfg.ScanIntervalMs
+	}
+	if cfg.TradeThreshold != 0 {
+		def.TradeThreshold = cfg.TradeThreshold
+	}
+	if cfg.TradeAmountUSD != 0 {
+		def.TradeAmountUSD = cfg.TradeAmountUSD
+	}
+	if cfg.TradeCooldownMs != 0 {
+		def.TradeCooldownMs = cfg.TradeCooldownMs
+	}
+	if cfg.AlertCooldownSec != 0 {
+		def.AlertCooldownSec = cfg.AlertCooldownSec
+	}
+	if cfg.MockSlippagePct != 0 {
+		def.MockSlippagePct = cfg.MockSlippagePct
+	}
+
+	return def
+}