package tradesignal

import (
	"fmt"
	"strings"
	"time"
)

type FormatOptions struct {
	AvgPrice *float64
}

func Format(signal *Signal, opts ...FormatOptions) string {
	var opt FormatOptions
	if len(opts) > 0 {
		opt = opts[0]
	}

	title := actionTitle(signal.Side, signal.Action)
	symbol := trimQuote(signal.Symbol)

	lines := []string{title}
	lines = append(lines, fmt.Sprintf("交易品种: %s", symbol))
	if p := strings.TrimSpace(signal.Period); p != "" {
		lines = append(lines, fmt.Sprintf("周期: %s", p))
	}

	action := strings.ToUpper(signal.Action)
	switch action {
	case "OPEN":
		lines = append(lines, fmt.Sprintf("开仓价格: %.2f", signal.Price))
		if line := sizeLine("OPEN", signal.Quantity, signal.AmountMarginRatio); line != "" {
			lines = append(lines, line)
		}
		lines = appendAvgPrice(lines, opt.AvgPrice)
		if signal.Leverage > 0 {
			lines = append(lines, fmt.Sprintf("杠杆: %dx", signal.Leverage))
		}
		if signal.TakeProfitPrice != nil {
			lines = append(lines, fmt.Sprintf("止盈价格: %.2f", *signal.TakeProfitPrice))
		}
		if signal.StopLossPrice != nil {
			lines = append(lines, fmt.Sprintf("止损价格: %.2f", *signal.StopLossPrice))
		}
	case "CLOSE":
		lines = append(lines, fmt.Sprintf("平仓价格: %.2f", signal.Price))
		lines = append(lines, closeSizeLine(signal.Quantity, signal.PosMarginRatio))
		lines = appendAvgPrice(lines, opt.AvgPrice)
		if signal.PnL != nil {
			lines = append(lines, fmt.Sprintf("平仓盈亏: %.2f", *signal.PnL))
		}
		if signal.AccountBalance != nil {
			lines = append(lines, fmt.Sprintf("账户余额：%.2f", *signal.AccountBalance))
		}
	case "ADD":
		lines = append(lines, fmt.Sprintf("加仓价格: %.2f", signal.Price))
		if line := sizeLine("ADD", signal.Quantity, signal.AmountMarginRatio); line != "" {
			lines = append(lines, line)
		}
		lines = appendAvgPrice(lines, opt.AvgPrice)
		if signal.Leverage > 0 {
			lines = append(lines, fmt.Sprintf("杠杆: %dx", signal.Leverage))
		}
	case "REDUCE":
		lines = append(lines, fmt.Sprintf("减仓价格: %.2f", signal.Price))
		if line := sizeLine("REDUCE", signal.Quantity, signal.PosMarginRatio); line != "" {
			lines = append(lines, line)
		}
		lines = appendAvgPrice(lines, opt.AvgPrice)
		if signal.PnL != nil {
			lines = append(lines, fmt.Sprintf("减仓盈亏: %.2f", *signal.PnL))
		}
		if signal.AccountBalance != nil {
			lines = append(lines, fmt.Sprintf("账户余额：%.2f", *signal.AccountBalance))
		}
	default:
		lines = append(lines, fmt.Sprintf("价格: %.2f", signal.Price))
		if line := sizeLine("", signal.Quantity, signal.AmountMarginRatio); line != "" {
			lines = append(lines, line)
		}
		lines = appendAvgPrice(lines, opt.AvgPrice)
	}

	if signal.StrategyCode != "" {
		lines = append(lines, fmt.Sprintf("策略: %s", signal.StrategyCode))
	}

	eventTime := signal.ParsedEventTime().In(time.Local)
	lines = append(lines, fmt.Sprintf("Time: %s", eventTime.Format("2006.01.02 15:04:05")))

	return strings.Join(lines, "\n")
}

func actionTitle(side, action string) string {
	side = strings.ToUpper(side)
	action = strings.ToUpper(action)

	var pos string
	switch side {
	case "LONG":
		pos = "多单"
	case "SHORT":
		pos = "空单"
	default:
		pos = side
	}

	var act string
	switch action {
	case "OPEN":
		act = "开仓"
	case "ADD":
		act = "加仓"
	case "CLOSE":
		act = "平仓"
	case "REDUCE":
		act = "减仓"
	default:
		act = action
	}

	return pos + act
}

func appendAvgPrice(lines []string, avgPrice *float64) []string {
	if avgPrice == nil || *avgPrice <= 0 {
		return lines
	}
	return append(lines, fmt.Sprintf("平均单价: %.2f", *avgPrice))
}

func closeSizeLine(quantity, posMarginRatio *float64) string {
	if quantity != nil && *quantity > 0 {
		return fmt.Sprintf("平仓数量: %.2f", *quantity)
	}
	ratio := 1.0
	if posMarginRatio != nil {
		ratio = *posMarginRatio
	}
	return fmt.Sprintf("平仓比例: %s", formatPercent(ratio))
}

func sizeLine(action string, quantity, marginRatio *float64) string {
	if quantity != nil && *quantity > 0 {
		return fmt.Sprintf("%s: %.2f", quantityLabel(action), *quantity)
	}
	if marginRatio != nil {
		return fmt.Sprintf("%s: %s", ratioLabel(action), formatPercent(*marginRatio))
	}
	if quantity != nil {
		return fmt.Sprintf("%s: %.2f", quantityLabel(action), *quantity)
	}
	return ""
}

func quantityLabel(action string) string {
	switch strings.ToUpper(action) {
	case "OPEN":
		return "开仓数量"
	case "ADD":
		return "加仓数量"
	case "CLOSE":
		return "平仓数量"
	case "REDUCE":
		return "减仓数量"
	default:
		return "数量"
	}
}

func ratioLabel(action string) string {
	switch strings.ToUpper(action) {
	case "OPEN":
		return "开仓比例"
	case "ADD":
		return "加仓比例"
	case "CLOSE":
		return "平仓比例"
	case "REDUCE":
		return "减仓比例"
	default:
		return "仓位比例"
	}
}

func formatPercent(ratio float64) string {
	return fmt.Sprintf("%.2f%%", ratio*100)
}

func trimQuote(symbol string) string {
	symbol = strings.ToUpper(symbol)
	for _, suffix := range []string{"USDT", "USDC", "BUSD", "USD"} {
		if strings.HasSuffix(symbol, suffix) && len(symbol) > len(suffix) {
			return symbol[:len(symbol)-len(suffix)]
		}
	}
	return symbol
}