exchange-monitor-go/config.go

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
	AlertCooldownSec int     // seconds between alerts for same coin
	ArbThreshold     float64 // minimum net profit % to trigger alert
	ScanIntervalMs   int     // how often scanner runs (milliseconds)

	// Automated trading
	TradeEnabled    bool
	TradeThreshold  float64 // minimum profit % to execute trade
	TradeAmountUSD  float64 // amount per trade in USDT
	TradeCooldownMs int     // ms between trades of same coin

	// Test mode (no real API keys needed)
	TestMode       bool
	MockSlippagePct float64 // simulated slippage per order (e.g. 0.01 = 0.01%)

	// Bitget API
	BitgetAPIKey     string
	BitgetAPISecret  string
	BitgetPassphrase string

	// HyperLiquid API
	HLPrivateKey string // ed25519 private key hex
	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
		}
		return def
	}
	getFloat := func(key string, def float64) float64 {
		v := os.Getenv(key)
		if v == "" {
			return def
		}
		f, err := strconv.ParseFloat(v, 64)
		if err != nil {
			return def
		}
		return f
	}
	getBool := func(key string, def bool) bool {
		v := os.Getenv(key)
		if v == "" {
			return def
		}
		return v == "1" || v == "true" || v == "yes"
	}

	return &Config{
		TelegramBotToken: getEnv("TELEGRAM_BOT_TOKEN", ""),
		TelegramChatID:   getEnv("TELEGRAM_CHAT_ID", ""),
		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", 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", jsonCfg.TestMode),
		MockSlippagePct: getFloat("MOCK_SLIPPAGE_PCT", jsonCfg.MockSlippagePct),

		BitgetAPIKey:     getEnv("BITGET_API_KEY", ""),
		BitgetAPISecret:  getEnv("BITGET_API_SECRET", ""),
		BitgetPassphrase: getEnv("BITGET_PASSPHRASE", ""),

		HLPrivateKey: getEnv("HL_PRIVATE_KEY", ""),
		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
	}

	// Boolean fields: zero default is false, so use OR logic
	// When JSON has true → true || false = true (override)
	// When JSON has false → false || false = false (keep default)
	def.TestMode = cfg.TestMode || def.TestMode
	def.TradeEnabled = cfg.TradeEnabled || def.TradeEnabled

	return def
}